TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Živojinović, Danijela
AU  - Kreculj, Dragan
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5419
AB  - Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.
PB  - Faculty of Mechanical Engineering, Belgrade
T2  - FME Transactions
T1  - Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts
EP  - 38
IS  - 1
SP  - 31
VL  - 51
DO  - 10.5937/fme2301031V
ER  - 

@article{
author = "Vorkapić, Miloš and Živojinović, Danijela and Kreculj, Dragan and Ivanov, Toni and Baltić, Marija and Simonović, Aleksandar",
year = "2023",
abstract = "Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.",
publisher = "Faculty of Mechanical Engineering, Belgrade",
journal = "FME Transactions",
title = "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts",
pages = "38-31",
number = "1",
volume = "51",
doi = "10.5937/fme2301031V"
}

Vorkapić, M., Živojinović, D., Kreculj, D., Ivanov, T., Baltić, M.,& Simonović, A.. (2023). Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions
Faculty of Mechanical Engineering, Belgrade., 51(1), 31-38.
https://doi.org/10.5937/fme2301031V

Vorkapić M, Živojinović D, Kreculj D, Ivanov T, Baltić M, Simonović A. Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions. 2023;51(1):31-38.
doi:10.5937/fme2301031V .

Vorkapić, Miloš, Živojinović, Danijela, Kreculj, Dragan, Ivanov, Toni, Baltić, Marija, Simonović, Aleksandar, "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts" in FME Transactions, 51, no. 1 (2023):31-38,
https://doi.org/10.5937/fme2301031V . .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanović, Milica
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7737
AB  - Biocomposite materials are a combination of two or more different biomaterials at the
macroscopic level, with competitive mechanical and insulation properties, relatively stable when
exposed to high temperatures and tailorable. In this paper, materials are with a vegetative part of
fungi (mycelium-mesh structure of hyphae) which are increasingly used to create biocomposites
with unique processing technology. The vegetative part of a fungus called mycelium, can serve as
a natural binder for products made of biocomposite and acts like a self-assembling adhesive by
digesting and adhering to the surface of specific organic matter. This paper presents the
development of mould technology to set the biocomposite structure and test its mechanical
characteristics. The primary purpose of the mould is to bring the loose natural material into a
solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing
the technologically prepared and hardened sample for tensile and pressure. Development and
moulding of biocomposite are the technological processes of drying after sowing mycelium so a
variant of the mould with a perforated upper part was used to harden the samples thoroughly.
C3  - The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia
T1  - DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7737
ER  - 

@conference{
author = "Baltić, Marija and Ivanović, Milica and Tanović, Dragoljub and Vorkapić, Miloš",
year = "2023",
abstract = "Biocomposite materials are a combination of two or more different biomaterials at the
macroscopic level, with competitive mechanical and insulation properties, relatively stable when
exposed to high temperatures and tailorable. In this paper, materials are with a vegetative part of
fungi (mycelium-mesh structure of hyphae) which are increasingly used to create biocomposites
with unique processing technology. The vegetative part of a fungus called mycelium, can serve as
a natural binder for products made of biocomposite and acts like a self-assembling adhesive by
digesting and adhering to the surface of specific organic matter. This paper presents the
development of mould technology to set the biocomposite structure and test its mechanical
characteristics. The primary purpose of the mould is to bring the loose natural material into a
solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing
the technologically prepared and hardened sample for tensile and pressure. Development and
moulding of biocomposite are the technological processes of drying after sowing mycelium so a
variant of the mould with a perforated upper part was used to harden the samples thoroughly.",
journal = "The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia",
title = "DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7737"
}

Baltić, M., Ivanović, M., Tanović, D.,& Vorkapić, M.. (2023). DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES). in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia.
https://hdl.handle.net/21.15107/rcub_machinery_7737

Baltić M, Ivanović M, Tanović D, Vorkapić M. DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES). in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7737 .

Baltić, Marija, Ivanović, Milica, Tanović, Dragoljub, Vorkapić, Miloš, "DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)" in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7737 .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanović, Milica
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7272
AB  - This paper presents the static testing of the composite material’s mechanical characteristics. An overview of the standards is made by which various tests are performed, and then an analysis of the results of the parameters obtained by the conventional method-stretching and optical (DIC system-bending) of carbon epoxy composite structures is given. These results represented the basis for the preparation and further application of biocomposite materials; that is, the testing procedure will be performed identically on composites containing mycelia. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D3039 and ASTM D7078, which include testing the technologically prepared and hardened sample for bending and shearing.
PB  - Springer, Cham
C3  - Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.
T1  - Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview
DO  - 10.1007/978-3-031-42041-2_31
ER  - 

@conference{
author = "Baltić, Marija and Ivanović, Milica and Tanović, Dragoljub and Vorkapić, Miloš and Mladenović, Ivana",
year = "2023",
abstract = "This paper presents the static testing of the composite material’s mechanical characteristics. An overview of the standards is made by which various tests are performed, and then an analysis of the results of the parameters obtained by the conventional method-stretching and optical (DIC system-bending) of carbon epoxy composite structures is given. These results represented the basis for the preparation and further application of biocomposite materials; that is, the testing procedure will be performed identically on composites containing mycelia. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D3039 and ASTM D7078, which include testing the technologically prepared and hardened sample for bending and shearing.",
publisher = "Springer, Cham",
journal = "Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.",
title = "Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview",
doi = "10.1007/978-3-031-42041-2_31"
}

Baltić, M., Ivanović, M., Tanović, D., Vorkapić, M.,& Mladenović, I.. (2023). Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview. in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.
Springer, Cham..
https://doi.org/10.1007/978-3-031-42041-2_31

Baltić M, Ivanović M, Tanović D, Vorkapić M, Mladenović I. Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview. in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.. 2023;.
doi:10.1007/978-3-031-42041-2_31 .

Baltić, Marija, Ivanović, Milica, Tanović, Dragoljub, Vorkapić, Miloš, Mladenović, Ivana, "Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview" in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham. (2023),
https://doi.org/10.1007/978-3-031-42041-2_31 . .

TY  - CONF
AU  - Ivanović, Milica
AU  - Baltić, Marija
AU  - Tanović, Dragoljub
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7293
AB  - Heat exchangers used in the aerospace industry have inherent requirements for maximizing heat transfer efficiency, reducing weight and size, ensuring enhanced durability, and enabling customization for different aircraft types. 3D printing technology allows for the utilization of advanced materials such as high-temperature alloys and ceramics, which can withstand the extreme conditions of aerospace environments. Recent studies have highligheted the potential of 3D-printed heat exchangers in various aerospace industry, including spacecraft thermal management, electronics cooling and aircraft engine cooling.
Heat exchangers modeled on the basis of TPMS (Triple Periodic Minimal Surface) structures exhibit high surface area-to-volume ratios and interconnected pore structures, resulting in significant enhancement in heat
transfer rates. TPMS has been extensively researched in mathematics and materials science for several decades, with classical examples like the Schwartz surface, Gyroid surface and Diamond surface mainly studied for designing small-scale heat exchangers. Numerous studies have demonstrated improved heat transfer efficiency, structural stability and durability of 3D-printed heat exchangers. However, the design of TPMS structures using existing CAD systems poses challenges and further improvements are needed in modeling process.
Overall, the combination of 3D printing technology and geometry optimization represents the state-of-the-art in heat exchanger research, holding significant potential to transform existing systems and drive the development of innovative and more efficient energy systems in the aerospace industry.
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023
T1  - Towards innovative and more efficient solutions for heat exchangers in aerospace industry
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7293
ER  - 

@conference{
author = "Ivanović, Milica and Baltić, Marija and Tanović, Dragoljub",
year = "2023",
abstract = "Heat exchangers used in the aerospace industry have inherent requirements for maximizing heat transfer efficiency, reducing weight and size, ensuring enhanced durability, and enabling customization for different aircraft types. 3D printing technology allows for the utilization of advanced materials such as high-temperature alloys and ceramics, which can withstand the extreme conditions of aerospace environments. Recent studies have highligheted the potential of 3D-printed heat exchangers in various aerospace industry, including spacecraft thermal management, electronics cooling and aircraft engine cooling.
Heat exchangers modeled on the basis of TPMS (Triple Periodic Minimal Surface) structures exhibit high surface area-to-volume ratios and interconnected pore structures, resulting in significant enhancement in heat
transfer rates. TPMS has been extensively researched in mathematics and materials science for several decades, with classical examples like the Schwartz surface, Gyroid surface and Diamond surface mainly studied for designing small-scale heat exchangers. Numerous studies have demonstrated improved heat transfer efficiency, structural stability and durability of 3D-printed heat exchangers. However, the design of TPMS structures using existing CAD systems poses challenges and further improvements are needed in modeling process.
Overall, the combination of 3D printing technology and geometry optimization represents the state-of-the-art in heat exchanger research, holding significant potential to transform existing systems and drive the development of innovative and more efficient energy systems in the aerospace industry.",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023",
title = "Towards innovative and more efficient solutions for heat exchangers in aerospace industry",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7293"
}

Ivanović, M., Baltić, M.,& Tanović, D.. (2023). Towards innovative and more efficient solutions for heat exchangers in aerospace industry. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023.
https://hdl.handle.net/21.15107/rcub_machinery_7293

Ivanović M, Baltić M, Tanović D. Towards innovative and more efficient solutions for heat exchangers in aerospace industry. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7293 .

Ivanović, Milica, Baltić, Marija, Tanović, Dragoljub, "Towards innovative and more efficient solutions for heat exchangers in aerospace industry" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023 (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7293 .

TY  - CONF
AU  - Tanović, Dragoljub
AU  - Svorcan, Jelena
AU  - Ivanović, Milica
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
AU  - Telebak, Katarina
AU  - Stojanović, Jagoš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7747
AB  - The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies
T1  - THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7747
ER  - 

@conference{
author = "Tanović, Dragoljub and Svorcan, Jelena and Ivanović, Milica and Baltić, Marija and Vorkapić, Miloš and Telebak, Katarina and Stojanović, Jagoš",
year = "2022",
abstract = "The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies",
title = "THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7747"
}

Tanović, D., Svorcan, J., Ivanović, M., Baltić, M., Vorkapić, M., Telebak, K.,& Stojanović, J.. (2022). THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS. in International Conference of Experimental and Numerical Investigations and New Technologies
Innovation Center of Faculty of Mechanical Engineering., 63.
https://hdl.handle.net/21.15107/rcub_machinery_7747

Tanović D, Svorcan J, Ivanović M, Baltić M, Vorkapić M, Telebak K, Stojanović J. THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS. in International Conference of Experimental and Numerical Investigations and New Technologies. 2022;:63.
https://hdl.handle.net/21.15107/rcub_machinery_7747 .

Tanović, Dragoljub, Svorcan, Jelena, Ivanović, Milica, Baltić, Marija, Vorkapić, Miloš, Telebak, Katarina, Stojanović, Jagoš, "THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS" in International Conference of Experimental and Numerical Investigations and New Technologies (2022):63,
https://hdl.handle.net/21.15107/rcub_machinery_7747 .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Živojinović, Danijela
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5428
AB  - Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.
PB  - Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet
C3  - Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
T1  - Značaj komponenti 3D štampača na ukupan kvalitet izrade modela
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5428
ER  - 

@conference{
author = "Vorkapić, Miloš and Ivanov, Toni and Baltić, Marija and Živojinović, Danijela",
year = "2022",
abstract = "Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.",
publisher = "Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet",
journal = "Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija",
title = "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5428"
}

Vorkapić, M., Ivanov, T., Baltić, M.,& Živojinović, D.. (2022). Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet..
https://hdl.handle.net/21.15107/rcub_machinery_5428

Vorkapić M, Ivanov T, Baltić M, Živojinović D. Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

Vorkapić, Miloš, Ivanov, Toni, Baltić, Marija, Živojinović, Danijela, "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela" in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

TY  - CONF
AU  - Trivković, Zorana
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Zorić, Nemanja
AU  - Peković, Ognjen
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3808
AB  - Vertical-axis wind turbines, despite being somewhat uncommon and less efficient renewable energy converters, still offer many advantages to small consumers and possibilities for further improvement. Their rotor is usually made up of fiber-glass composite blades that can be optimized both aerodynamically and/or structurally. Although the aerodynamics of vertical-axis wind turbine rotors is unsteady, complex and challenging to simulate, it is possible to make a sufficiently accurate estimation of variable aerodynamic loads acting on the blade and use them for its structural dimensioning. This research combines a multi-objective constrained optimization procedure by particle swarm and finite element method with experimental analyses with the purpose of defining the best blade, i.e. the blade of minimal mass, least tip deflection under the loading case corresponding to the aerodynamically most demanding operational regime, greatest difference between its natural frequencies and rated rotor angular frequency, lowest manufacturing cost and complexity, etc. Imposed constraints also include acceptable failure criteria along the blade. Design variables refer to ply lay-up scheme, i.e. lamina thicknesses and orientations. Final solution, chosen from the obtained Pareto set, was manufactured and experimentally validated. The consistency of strains, measured in several different cases of bending, and corresponding numerical values was mostly below 8%. The study demonstrates the applicability of the employed multi-objective optimization methodology in wind turbine blade design. It also proposes an affordable and structurally reliable composite lay-up scheme specifically designed for small-scale vertical-axis wind turbines.
PB  - Springer Science and Business Media Deutschland GmbH
C3  - Lecture Notes in Networks and Systems
T1  - Multi-objective optimization and experimental testing of a laminated vertical-axis wind turbine blade
EP  - 65
SP  - 39
VL  - 323
DO  - 10.1007/978-3-030-86009-7_3
ER  - 

@conference{
author = "Trivković, Zorana and Svorcan, Jelena and Baltić, Marija and Zorić, Nemanja and Peković, Ognjen",
year = "2022",
abstract = "Vertical-axis wind turbines, despite being somewhat uncommon and less efficient renewable energy converters, still offer many advantages to small consumers and possibilities for further improvement. Their rotor is usually made up of fiber-glass composite blades that can be optimized both aerodynamically and/or structurally. Although the aerodynamics of vertical-axis wind turbine rotors is unsteady, complex and challenging to simulate, it is possible to make a sufficiently accurate estimation of variable aerodynamic loads acting on the blade and use them for its structural dimensioning. This research combines a multi-objective constrained optimization procedure by particle swarm and finite element method with experimental analyses with the purpose of defining the best blade, i.e. the blade of minimal mass, least tip deflection under the loading case corresponding to the aerodynamically most demanding operational regime, greatest difference between its natural frequencies and rated rotor angular frequency, lowest manufacturing cost and complexity, etc. Imposed constraints also include acceptable failure criteria along the blade. Design variables refer to ply lay-up scheme, i.e. lamina thicknesses and orientations. Final solution, chosen from the obtained Pareto set, was manufactured and experimentally validated. The consistency of strains, measured in several different cases of bending, and corresponding numerical values was mostly below 8%. The study demonstrates the applicability of the employed multi-objective optimization methodology in wind turbine blade design. It also proposes an affordable and structurally reliable composite lay-up scheme specifically designed for small-scale vertical-axis wind turbines.",
publisher = "Springer Science and Business Media Deutschland GmbH",
journal = "Lecture Notes in Networks and Systems",
title = "Multi-objective optimization and experimental testing of a laminated vertical-axis wind turbine blade",
pages = "65-39",
volume = "323",
doi = "10.1007/978-3-030-86009-7_3"
}

Trivković, Z., Svorcan, J., Baltić, M., Zorić, N.,& Peković, O.. (2022). Multi-objective optimization and experimental testing of a laminated vertical-axis wind turbine blade. in Lecture Notes in Networks and Systems
Springer Science and Business Media Deutschland GmbH., 323, 39-65.
https://doi.org/10.1007/978-3-030-86009-7_3

Trivković Z, Svorcan J, Baltić M, Zorić N, Peković O. Multi-objective optimization and experimental testing of a laminated vertical-axis wind turbine blade. in Lecture Notes in Networks and Systems. 2022;323:39-65.
doi:10.1007/978-3-030-86009-7_3 .

Trivković, Zorana, Svorcan, Jelena, Baltić, Marija, Zorić, Nemanja, Peković, Ognjen, "Multi-objective optimization and experimental testing of a laminated vertical-axis wind turbine blade" in Lecture Notes in Networks and Systems, 323 (2022):39-65,
https://doi.org/10.1007/978-3-030-86009-7_3 . .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Baltić, Marija
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5422
AB  - This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - The significance of 3D printing in textile-polymer composite structures realization for special purpose
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5422
ER  - 

@conference{
author = "Vorkapić, Miloš and Baltić, Marija and Ivanov, Toni and Simonović, Aleksandar",
year = "2022",
abstract = "This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "The significance of 3D printing in textile-polymer composite structures realization for special purpose",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5422"
}

Vorkapić, M., Baltić, M., Ivanov, T.,& Simonović, A.. (2022). The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5422

Vorkapić M, Baltić M, Ivanov T, Simonović A. The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5422 .

Vorkapić, Miloš, Baltić, Marija, Ivanov, Toni, Simonović, Aleksandar, "The significance of 3D printing in textile-polymer composite structures realization for special purpose" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5422 .

TY  - CONF
AU  - Ivanović, Milica
AU  - Mališić, Snežana
AU  - Simonović, Aleksandar
AU  - Baltić, Marija
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6440
AB  - Global warming and ozone depletion issues have had an impact on novel approaches of integrating some of
the energy production systems. In present, fossil fuels such as oil, coal and natural gas still are the primary
sources of energy used to provide the majority of the cooling requirements in vapor compression systems. In
addition, this high energy-consumption systems work with substances that contribute to ozone layer depletion
and are typically based on fluorinated gases (F gases), that as well, can have a global warming impact
thousands of times greater than CO2. Much research has been done on reuse and waste heat utilization within
different systems to achieve a reduction in high carbon fuel consumption. The method that aims at improving
the value of the exergy of the available renewable energy sources is the absorption refrigeration cycle (ARC).
With ARC, the concept of “cooling with the heat“ can be achieved, with a variety of benefits such as integration
of the energy production systems, implementation of sustainable based technology in the industry of cooling,
the possibility of establishing a district cooling system, etc. The cooling demands can be met through utilization
of solar radiation, energy from biomass, waste heat from industrial processes, geothermal energy.
In the terms of the importance of low-temperature heat sources and the reuse of heat energy, currently present
researches have focus on identifying engineering and cost-effective approaches to enhance the efficiency of
an integrated system. That kind of system affects the output parameters of energy production and energy
consumption, so the possibilities to compare the different systems from the exergy and economic standpoint,
based on the different parameters are vast. The criteria of comparison and investigation the effects of
integrated systems in majority of cases would be based on: better performance at very low temperatures,
carbon dioxide emissions and cost savings. Despite the existence of different obstacles, the integration of
different energy production systems will have a considerable impact when it comes to overcoming the
challenges in the energy sector.
C3  - International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH
T1  - Perspectives of the integration of an absorption refrigeration cycle in energy production system
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6440
ER  - 

@conference{
author = "Ivanović, Milica and Mališić, Snežana and Simonović, Aleksandar and Baltić, Marija",
year = "2022",
abstract = "Global warming and ozone depletion issues have had an impact on novel approaches of integrating some of
the energy production systems. In present, fossil fuels such as oil, coal and natural gas still are the primary
sources of energy used to provide the majority of the cooling requirements in vapor compression systems. In
addition, this high energy-consumption systems work with substances that contribute to ozone layer depletion
and are typically based on fluorinated gases (F gases), that as well, can have a global warming impact
thousands of times greater than CO2. Much research has been done on reuse and waste heat utilization within
different systems to achieve a reduction in high carbon fuel consumption. The method that aims at improving
the value of the exergy of the available renewable energy sources is the absorption refrigeration cycle (ARC).
With ARC, the concept of “cooling with the heat“ can be achieved, with a variety of benefits such as integration
of the energy production systems, implementation of sustainable based technology in the industry of cooling,
the possibility of establishing a district cooling system, etc. The cooling demands can be met through utilization
of solar radiation, energy from biomass, waste heat from industrial processes, geothermal energy.
In the terms of the importance of low-temperature heat sources and the reuse of heat energy, currently present
researches have focus on identifying engineering and cost-effective approaches to enhance the efficiency of
an integrated system. That kind of system affects the output parameters of energy production and energy
consumption, so the possibilities to compare the different systems from the exergy and economic standpoint,
based on the different parameters are vast. The criteria of comparison and investigation the effects of
integrated systems in majority of cases would be based on: better performance at very low temperatures,
carbon dioxide emissions and cost savings. Despite the existence of different obstacles, the integration of
different energy production systems will have a considerable impact when it comes to overcoming the
challenges in the energy sector.",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH",
title = "Perspectives of the integration of an absorption refrigeration cycle in energy production system",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6440"
}

Ivanović, M., Mališić, S., Simonović, A.,& Baltić, M.. (2022). Perspectives of the integration of an absorption refrigeration cycle in energy production system. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH.
https://hdl.handle.net/21.15107/rcub_machinery_6440

Ivanović M, Mališić S, Simonović A, Baltić M. Perspectives of the integration of an absorption refrigeration cycle in energy production system. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6440 .

Ivanović, Milica, Mališić, Snežana, Simonović, Aleksandar, Baltić, Marija, "Perspectives of the integration of an absorption refrigeration cycle in energy production system" in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6440 .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Pergal, Marija
AU  - Ivanov, Toni
AU  - Baltić, Marija
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5421
AB  - Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
PB  - Belgrade : Balkan Scientific Centre
T2  - Tribology and Materials
T1  - Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
EP  - 80
IS  - 2
SP  - 70
VL  - 1
DO  - 10.46793/tribomat.2022.009
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Pergal, Marija and Ivanov, Toni and Baltić, Marija",
year = "2022",
abstract = "Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.",
publisher = "Belgrade : Balkan Scientific Centre",
journal = "Tribology and Materials",
title = "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology",
pages = "80-70",
number = "2",
volume = "1",
doi = "10.46793/tribomat.2022.009"
}

Vorkapić, M., Mladenović, I., Pergal, M., Ivanov, T.,& Baltić, M.. (2022). Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials
Belgrade : Balkan Scientific Centre., 1(2), 70-80.
https://doi.org/10.46793/tribomat.2022.009

Vorkapić M, Mladenović I, Pergal M, Ivanov T, Baltić M. Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials. 2022;1(2):70-80.
doi:10.46793/tribomat.2022.009 .

Vorkapić, Miloš, Mladenović, Ivana, Pergal, Marija, Ivanov, Toni, Baltić, Marija, "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology" in Tribology and Materials, 1, no. 2 (2022):70-80,
https://doi.org/10.46793/tribomat.2022.009 . .

TY  - CHAP
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Peković, Ognjen
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3679
AB  - The past few decades have been marked by an immense interest of the scientific community in making better use of renewable energy resources, particularly wind energy. One of the suggestions is to increase the number of small-scale vertical-axis wind turbines (VAWTs) in densely populated areas. Given that VAWTs primarily operate in adverse conditions (irregular wind speeds, Earth’s boundary layer, vortex trail of surrounding objects), it is necessary to pay special attention to the numerical and experimental estimation of their aerodynamic performances. The conceptual design of small-scale wind turbines usually begins with detailed simulations of the encompassing flow field. There are three categories of most often employed computational methods for Darrieus-type VAWTs: i) quasi 1D momentum models frequently upgraded by blade element theory, ii) vortex models and iii) computational fluid dynamics (CFD) approach that enables modeling the complete flow field. Each of these methods is founded on a particular set of assumptions, has its advantages and disadvantages and can provide different numerical results, although engineers are usually mostly interested in accurately estimating power coefficient curves. This paper describes and references some of the realized and tested small-scale VAWTs. It also accentuates modeling possibilities as well as several dilemmas, challenges and errors that may appear while performing complex, unsteady aerodynamic analyses of fluid flows encompassing VAWTs. The main goal of the paper is to provide useful guidelines for successful design of small-scale VAWTs for urban environments.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Computing aerodynamic performances of small-scale vertical-axis wind turbines: Possibilities and challenges
EP  - 111
SP  - 91
VL  - 153
DO  - 10.1007/978-3-030-58362-0_7
ER  - 

@inbook{
author = "Svorcan, Jelena and Baltić, Marija and Peković, Ognjen",
year = "2021",
abstract = "The past few decades have been marked by an immense interest of the scientific community in making better use of renewable energy resources, particularly wind energy. One of the suggestions is to increase the number of small-scale vertical-axis wind turbines (VAWTs) in densely populated areas. Given that VAWTs primarily operate in adverse conditions (irregular wind speeds, Earth’s boundary layer, vortex trail of surrounding objects), it is necessary to pay special attention to the numerical and experimental estimation of their aerodynamic performances. The conceptual design of small-scale wind turbines usually begins with detailed simulations of the encompassing flow field. There are three categories of most often employed computational methods for Darrieus-type VAWTs: i) quasi 1D momentum models frequently upgraded by blade element theory, ii) vortex models and iii) computational fluid dynamics (CFD) approach that enables modeling the complete flow field. Each of these methods is founded on a particular set of assumptions, has its advantages and disadvantages and can provide different numerical results, although engineers are usually mostly interested in accurately estimating power coefficient curves. This paper describes and references some of the realized and tested small-scale VAWTs. It also accentuates modeling possibilities as well as several dilemmas, challenges and errors that may appear while performing complex, unsteady aerodynamic analyses of fluid flows encompassing VAWTs. The main goal of the paper is to provide useful guidelines for successful design of small-scale VAWTs for urban environments.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Computing aerodynamic performances of small-scale vertical-axis wind turbines: Possibilities and challenges",
pages = "111-91",
volume = "153",
doi = "10.1007/978-3-030-58362-0_7"
}

Svorcan, J., Baltić, M.,& Peković, O.. (2021). Computing aerodynamic performances of small-scale vertical-axis wind turbines: Possibilities and challenges. in Lecture Notes in Networks and Systems
Springer., 153, 91-111.
https://doi.org/10.1007/978-3-030-58362-0_7

Svorcan J, Baltić M, Peković O. Computing aerodynamic performances of small-scale vertical-axis wind turbines: Possibilities and challenges. in Lecture Notes in Networks and Systems. 2021;153:91-111.
doi:10.1007/978-3-030-58362-0_7 .

Svorcan, Jelena, Baltić, Marija, Peković, Ognjen, "Computing aerodynamic performances of small-scale vertical-axis wind turbines: Possibilities and challenges" in Lecture Notes in Networks and Systems, 153 (2021):91-111,
https://doi.org/10.1007/978-3-030-58362-0_7 . .

TY  - CONF
AU  - Trivković, Zorana
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Zorić, Nemanja
AU  - Peković, Ognjen
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4258
AB  - Although less efficient than their horizontal-axis counterparts, vertical-axis wind turbines (VAWTs) present an interesting research topic as well as a renewable energy converter with lots of potential for application in both urban and secluded rural environments. This is mostly due to the fact that lift-type VAWTs require lower cut-in speeds, can operate in variable wind profiles, and produce low-level noise. Particularly interesting are small-scale machines that operate in low Reynolds numbers where viscosity effects are particularly noticeable.
The design of a small-scale composite vertical-axis wind turbine blade comprises several steps. First, the blade should be modelled and the expected aerodynamic loads should be estimated with sufficient accuracy. Secondly, structural analysis of its composite elements should be performed for various load cases (including conjugate aerodynamic, inertial, and gravitational loads at different wind speeds and/or wind turbine rotor angular velocities). Finally, manufacturing technology should be defined and the blade should be manufactured as well as experimentally tested so that the starting computational models can be assessed and validated.
The goal of the presented research study is to conduct a complete design process of a small-scale VAWT blade. Aerodynamic loads are numerically estimated by the finite volume method, while structural analysis of the blade is performed by the finite element method. Additionally, the lay-up sequence of the blade inner composite structure is optimized by the particle swarm method. In the end, the designed blade is produced by a wet lay-up manufacturing process. The consistency of strains, measured in several different cases of blade bending, and corresponding numerical values were mostly below 8% which justifies the adopted design procedure.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
T1  - Design of small-scale composite vertical-axis wind turbine blade
SP  - 68
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4258
ER  - 

@conference{
author = "Trivković, Zorana and Svorcan, Jelena and Baltić, Marija and Zorić, Nemanja and Peković, Ognjen",
year = "2021",
abstract = "Although less efficient than their horizontal-axis counterparts, vertical-axis wind turbines (VAWTs) present an interesting research topic as well as a renewable energy converter with lots of potential for application in both urban and secluded rural environments. This is mostly due to the fact that lift-type VAWTs require lower cut-in speeds, can operate in variable wind profiles, and produce low-level noise. Particularly interesting are small-scale machines that operate in low Reynolds numbers where viscosity effects are particularly noticeable.
The design of a small-scale composite vertical-axis wind turbine blade comprises several steps. First, the blade should be modelled and the expected aerodynamic loads should be estimated with sufficient accuracy. Secondly, structural analysis of its composite elements should be performed for various load cases (including conjugate aerodynamic, inertial, and gravitational loads at different wind speeds and/or wind turbine rotor angular velocities). Finally, manufacturing technology should be defined and the blade should be manufactured as well as experimentally tested so that the starting computational models can be assessed and validated.
The goal of the presented research study is to conduct a complete design process of a small-scale VAWT blade. Aerodynamic loads are numerically estimated by the finite volume method, while structural analysis of the blade is performed by the finite element method. Additionally, the lay-up sequence of the blade inner composite structure is optimized by the particle swarm method. In the end, the designed blade is produced by a wet lay-up manufacturing process. The consistency of strains, measured in several different cases of blade bending, and corresponding numerical values were mostly below 8% which justifies the adopted design procedure.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH",
title = "Design of small-scale composite vertical-axis wind turbine blade",
pages = "68",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4258"
}

Trivković, Z., Svorcan, J., Baltić, M., Zorić, N.,& Peković, O.. (2021). Design of small-scale composite vertical-axis wind turbine blade. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 68.
https://hdl.handle.net/21.15107/rcub_machinery_4258

Trivković Z, Svorcan J, Baltić M, Zorić N, Peković O. Design of small-scale composite vertical-axis wind turbine blade. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH. 2021;:68.
https://hdl.handle.net/21.15107/rcub_machinery_4258 .

Trivković, Zorana, Svorcan, Jelena, Baltić, Marija, Zorić, Nemanja, Peković, Ognjen, "Design of small-scale composite vertical-axis wind turbine blade" in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH (2021):68,
https://hdl.handle.net/21.15107/rcub_machinery_4258 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Peković, Ognjen
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4257
AB  - Open systems, that include both water and air fractions, and whose behavior is highly dominated by the interaction between these two phases are particularly important and interesting for many industrial applications (e.g. energy production, maritime and aerial transport, food resources). Since the physics governing these flows is highly complex and incorporates many unexplained phenomena, novel physical models, as well as measurement techniques, are still being developed and tested in accordance with the particular problem that is being analyzed. Although real engineering cases often involve wind-wave interactions, stochastic waves, geometrically irregular boundaries, turbulence, wave interference etc, the main interests of this work are the effects of oncoming wind speed as well as adopted turbulence model on the initially still water surface and consequential wave formation. These aspects have to be considered in the development of amphibian aircrafts or ekranoplans since they take off from water surfaces while later aircrafts operate in the vicinity of water during the entire flight. Wave formation is also extremely important
for off-shore wind turbines. For the sake of simplicity, the conducted numerical simulations are planar. The fluids (air and water) are considered incompressible, while the flow is unsteady and turbulent. The unsteady Reynolds averaged Navier-Stokes equations are closed by one of the two two-equation turbulence models based on the Boussinesq hypothesis: realizable k-ε or k-ω SST model. The investigated wind speeds are 30 m/s, 50 m/s and 80 m/s, while the results are presented in the shape of water volume fractions. As expected, the increase in wind speed induces higher amplitude waves, when the effects of turbulence models also become important.
PB  - International Association for Hydro-Environment Engineering and Research (IAHR)
C3  - Abstract Book - 6th IAHR Europe Congress
T1  - The effects of wind speed and turbulence model on wave formation in open systems
EP  - 860
SP  - 859
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4257
ER  - 

@conference{
author = "Svorcan, Jelena and Peković, Ognjen and Ivanov, Toni and Baltić, Marija and Simonović, Aleksandar",
year = "2021",
abstract = "Open systems, that include both water and air fractions, and whose behavior is highly dominated by the interaction between these two phases are particularly important and interesting for many industrial applications (e.g. energy production, maritime and aerial transport, food resources). Since the physics governing these flows is highly complex and incorporates many unexplained phenomena, novel physical models, as well as measurement techniques, are still being developed and tested in accordance with the particular problem that is being analyzed. Although real engineering cases often involve wind-wave interactions, stochastic waves, geometrically irregular boundaries, turbulence, wave interference etc, the main interests of this work are the effects of oncoming wind speed as well as adopted turbulence model on the initially still water surface and consequential wave formation. These aspects have to be considered in the development of amphibian aircrafts or ekranoplans since they take off from water surfaces while later aircrafts operate in the vicinity of water during the entire flight. Wave formation is also extremely important
for off-shore wind turbines. For the sake of simplicity, the conducted numerical simulations are planar. The fluids (air and water) are considered incompressible, while the flow is unsteady and turbulent. The unsteady Reynolds averaged Navier-Stokes equations are closed by one of the two two-equation turbulence models based on the Boussinesq hypothesis: realizable k-ε or k-ω SST model. The investigated wind speeds are 30 m/s, 50 m/s and 80 m/s, while the results are presented in the shape of water volume fractions. As expected, the increase in wind speed induces higher amplitude waves, when the effects of turbulence models also become important.",
publisher = "International Association for Hydro-Environment Engineering and Research (IAHR)",
journal = "Abstract Book - 6th IAHR Europe Congress",
title = "The effects of wind speed and turbulence model on wave formation in open systems",
pages = "860-859",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4257"
}

Svorcan, J., Peković, O., Ivanov, T., Baltić, M.,& Simonović, A.. (2021). The effects of wind speed and turbulence model on wave formation in open systems. in Abstract Book - 6th IAHR Europe Congress
International Association for Hydro-Environment Engineering and Research (IAHR)., 859-860.
https://hdl.handle.net/21.15107/rcub_machinery_4257

Svorcan J, Peković O, Ivanov T, Baltić M, Simonović A. The effects of wind speed and turbulence model on wave formation in open systems. in Abstract Book - 6th IAHR Europe Congress. 2021;:859-860.
https://hdl.handle.net/21.15107/rcub_machinery_4257 .

Svorcan, Jelena, Peković, Ognjen, Ivanov, Toni, Baltić, Marija, Simonović, Aleksandar, "The effects of wind speed and turbulence model on wave formation in open systems" in Abstract Book - 6th IAHR Europe Congress (2021):859-860,
https://hdl.handle.net/21.15107/rcub_machinery_4257 .

TY  - CONF
AU  - Baltić, Marija
AU  - Svorcan, Jelena
AU  - Peković, Ognjen
AU  - Ivanov, Toni
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3270
AB  - The paper presents the comparative analysis of the dynamic behavior of two rectangular plates of different material, aluminum and composite. While their global geometric dimensions (length, width and thickness) are similar, their inner structures are quite different. Whereas aluminum plate can be considered isotropic, the composite plate is a unidirectional carbon-epoxy laminate. Modal characteristics of the two plates were determined both numerically and experimentally and a comparative analysis of the obtained results was performed. Responses of the plates were documented by an optical, contactless 3D digital image correlation (DIC) system that contains a set of high-speed cameras capable of recording the movement of the white-and-black stochastic pattern applied to the upper surfaces of the plates. Numerical simulations were performed by the finite element method (FEM) in the commercial software package ANSYS. The plates were excited by a modal hammer and allowed to freely oscillate. In order to determine the natural frequencies of the plates the recorded time-domain responses were post-processed, i.e. converted to the frequency domain by fast Fourier transform (FFT). The first three natural modes were successfully experimentally established and compared to the corresponding numerical values. Since the differences between the two sets of results are less than 5%, the applied experimental technique can be considered valid and suitable for a wide range of engineering problems involving vibrations.
PB  - Springer International Publishing Ag, Cham
C3  - Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
T1  - Comparative Numerical and Experimental Modal Analysis of Aluminum and Composite Plates
EP  - 75
SP  - 61
VL  - 90
DO  - 10.1007/978-3-030-30853-7_4
ER  - 

@conference{
author = "Baltić, Marija and Svorcan, Jelena and Peković, Ognjen and Ivanov, Toni",
year = "2020",
abstract = "The paper presents the comparative analysis of the dynamic behavior of two rectangular plates of different material, aluminum and composite. While their global geometric dimensions (length, width and thickness) are similar, their inner structures are quite different. Whereas aluminum plate can be considered isotropic, the composite plate is a unidirectional carbon-epoxy laminate. Modal characteristics of the two plates were determined both numerically and experimentally and a comparative analysis of the obtained results was performed. Responses of the plates were documented by an optical, contactless 3D digital image correlation (DIC) system that contains a set of high-speed cameras capable of recording the movement of the white-and-black stochastic pattern applied to the upper surfaces of the plates. Numerical simulations were performed by the finite element method (FEM) in the commercial software package ANSYS. The plates were excited by a modal hammer and allowed to freely oscillate. In order to determine the natural frequencies of the plates the recorded time-domain responses were post-processed, i.e. converted to the frequency domain by fast Fourier transform (FFT). The first three natural modes were successfully experimentally established and compared to the corresponding numerical values. Since the differences between the two sets of results are less than 5%, the applied experimental technique can be considered valid and suitable for a wide range of engineering problems involving vibrations.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019",
title = "Comparative Numerical and Experimental Modal Analysis of Aluminum and Composite Plates",
pages = "75-61",
volume = "90",
doi = "10.1007/978-3-030-30853-7_4"
}

Baltić, M., Svorcan, J., Peković, O.,& Ivanov, T.. (2020). Comparative Numerical and Experimental Modal Analysis of Aluminum and Composite Plates. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
Springer International Publishing Ag, Cham., 90, 61-75.
https://doi.org/10.1007/978-3-030-30853-7_4

Baltić M, Svorcan J, Peković O, Ivanov T. Comparative Numerical and Experimental Modal Analysis of Aluminum and Composite Plates. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019. 2020;90:61-75.
doi:10.1007/978-3-030-30853-7_4 .

Baltić, Marija, Svorcan, Jelena, Peković, Ognjen, Ivanov, Toni, "Comparative Numerical and Experimental Modal Analysis of Aluminum and Composite Plates" in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019, 90 (2020):61-75,
https://doi.org/10.1007/978-3-030-30853-7_4 . .

TY  - CONF
AU  - Baltić, Marija
AU  - Hasan, Mohammad Sakib
AU  - Milovanović, Aleksa
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7362
AB  - Expansion of economic development also encourages the need for research, testing and application of new
advanced materials. Bearing in mind the development of technology and market dynamics in renewable energy
resources, especially wind potential, technology transfer in this field is very significant in all countries where
this industry is insufficiently developed. The advancement of wind turbines, as high-tech products and
components that require specific high quality characteristics, can influence the modernization of the
mechanical industry. For this reason, the development, testing, production and application of advanced highperformance
composite materials are of great importance.
The work presents the experimental testing and mechanical behaviour of composite structures under tensile
loading. Two types of carbon-epoxy plates and two types of glass-epoxy plates, of the same dimensions but
different ply lay-up sequences, were prepared and experimentally tested according to the procedure prescribed
by the tensile test standard ASTM D3039. The performance of the samples were first simulated in ANSYS
software in order to validate and verify the experimental set-up, and then experiments were performed under
tensile loading at the universal electromechanical test frame SHIMADZU AGS-X 100 kN. The experimentally
obtained modules of elasticity are presented. The measured values are also illustrated graphically in forcedisplacement
and stress-strain diagrams. The presented results acquired by this test method are important in
order to better understand the behaviour of composite structures under various load cases. The obtained
information and performed analysis of the measured parameters can be used in further experimental
investigations as well as in different comparative studies of conventional and unconventional empirical
methods.
C3  - International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)
T1  - Experimental investigation of mechanical characteristics of composite plates under tensile loading
SP  - 53
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7362
ER  - 

@conference{
author = "Baltić, Marija and Hasan, Mohammad Sakib and Milovanović, Aleksa",
year = "2020",
abstract = "Expansion of economic development also encourages the need for research, testing and application of new
advanced materials. Bearing in mind the development of technology and market dynamics in renewable energy
resources, especially wind potential, technology transfer in this field is very significant in all countries where
this industry is insufficiently developed. The advancement of wind turbines, as high-tech products and
components that require specific high quality characteristics, can influence the modernization of the
mechanical industry. For this reason, the development, testing, production and application of advanced highperformance
composite materials are of great importance.
The work presents the experimental testing and mechanical behaviour of composite structures under tensile
loading. Two types of carbon-epoxy plates and two types of glass-epoxy plates, of the same dimensions but
different ply lay-up sequences, were prepared and experimentally tested according to the procedure prescribed
by the tensile test standard ASTM D3039. The performance of the samples were first simulated in ANSYS
software in order to validate and verify the experimental set-up, and then experiments were performed under
tensile loading at the universal electromechanical test frame SHIMADZU AGS-X 100 kN. The experimentally
obtained modules of elasticity are presented. The measured values are also illustrated graphically in forcedisplacement
and stress-strain diagrams. The presented results acquired by this test method are important in
order to better understand the behaviour of composite structures under various load cases. The obtained
information and performed analysis of the measured parameters can be used in further experimental
investigations as well as in different comparative studies of conventional and unconventional empirical
methods.",
journal = "International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor)",
title = "Experimental investigation of mechanical characteristics of composite plates under tensile loading",
pages = "53",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7362"
}

Baltić, M., Hasan, M. S.,& Milovanović, A.. (2020). Experimental investigation of mechanical characteristics of composite plates under tensile loading. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor), 53.
https://hdl.handle.net/21.15107/rcub_machinery_7362

Baltić M, Hasan MS, Milovanović A. Experimental investigation of mechanical characteristics of composite plates under tensile loading. in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor). 2020;:53.
https://hdl.handle.net/21.15107/rcub_machinery_7362 .

Baltić, Marija, Hasan, Mohammad Sakib, Milovanović, Aleksa, "Experimental investigation of mechanical characteristics of composite plates under tensile loading" in International conference of experimental and numerical investigations and new technologies (2020 ; Zlatibor) (2020):53,
https://hdl.handle.net/21.15107/rcub_machinery_7362 .

TY  - CONF
AU  - Baltić, Marija
AU  - Hasan, Sakib Mohammad
AU  - Daou, David
AU  - Milovanović, Aleksa
AU  - Kovačević, Aleksandar
AU  - Milošević, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7282
AB  - - Kompozitni materijali predstavljaju napredne materijale visokih mehaničkih i fizičkih karakteristika, pa je njihova primena uglavnom zastupljena u specifičnim oblastima industrije, kao što su vazduhoplovstvo i vetroenergetski sistemi. Lopatice vetroturbina kao najkompleksnije komponente, se uglavnom izradjuju od kompozitnih materijala, pa je i njihovom izučavanju i testiranju potrebno posvetiti posebnu pažnju.
U radu je prikazano mehaničko ponašanje kompozitnih ploča izloženih dejstvu na istezanje. Tri kompozitne ploče karbon epoksidnog sastava, istih dimenzija, ali sa različitom orijentacijom slojeva su u skladu sa procedurom propisanom standardom D3039, pripremljene i eksperimentalno testirane. Ponašanje uzoraka je najpre simulirano u odgovarajućem softveru, u cilju provere i verifikacije eksperimentalne postavke, a zatim su vršeni testovi pod dejstvom zateznog opterećenja na kidalici SHIMADZU AGS-X 100 kN.
Dobijene vrednosti su grafički ilustrovane na dijagramima napon-deformacija. Prikazani rezultati dobijeni ovom metodom ispitivanja su od značaja u cilju boljeg razumevanja ponašanja kompozitnih struktura pod dejstvom različitih vrsta opterećenja, kako statičkih, tako i dinamičkih, jer poznavanje datih vrednosti daje širok spektar mogućnosti u daljim ispitivanjima i uporednim analizama sa ostalim eksperimentalnim metodama.
C3  - ENERGY, ECONOMY, ECOLOGY Journal of Scientific and Research Publications
T1  - Investigation of mechanical characteristics of composite plates under tensile loading
VL  - Volume X, Issue X
DO  - ISSN 0354-8651
ER  - 

@conference{
author = "Baltić, Marija and Hasan, Sakib Mohammad and Daou, David and Milovanović, Aleksa and Kovačević, Aleksandar and Milošević, Miloš",
year = "2020",
abstract = "- Kompozitni materijali predstavljaju napredne materijale visokih mehaničkih i fizičkih karakteristika, pa je njihova primena uglavnom zastupljena u specifičnim oblastima industrije, kao što su vazduhoplovstvo i vetroenergetski sistemi. Lopatice vetroturbina kao najkompleksnije komponente, se uglavnom izradjuju od kompozitnih materijala, pa je i njihovom izučavanju i testiranju potrebno posvetiti posebnu pažnju.
U radu je prikazano mehaničko ponašanje kompozitnih ploča izloženih dejstvu na istezanje. Tri kompozitne ploče karbon epoksidnog sastava, istih dimenzija, ali sa različitom orijentacijom slojeva su u skladu sa procedurom propisanom standardom D3039, pripremljene i eksperimentalno testirane. Ponašanje uzoraka je najpre simulirano u odgovarajućem softveru, u cilju provere i verifikacije eksperimentalne postavke, a zatim su vršeni testovi pod dejstvom zateznog opterećenja na kidalici SHIMADZU AGS-X 100 kN.
Dobijene vrednosti su grafički ilustrovane na dijagramima napon-deformacija. Prikazani rezultati dobijeni ovom metodom ispitivanja su od značaja u cilju boljeg razumevanja ponašanja kompozitnih struktura pod dejstvom različitih vrsta opterećenja, kako statičkih, tako i dinamičkih, jer poznavanje datih vrednosti daje širok spektar mogućnosti u daljim ispitivanjima i uporednim analizama sa ostalim eksperimentalnim metodama.",
journal = "ENERGY, ECONOMY, ECOLOGY Journal of Scientific and Research Publications",
title = "Investigation of mechanical characteristics of composite plates under tensile loading",
volume = "Volume X, Issue X",
doi = "ISSN 0354-8651"
}

Baltić, M., Hasan, S. M., Daou, D., Milovanović, A., Kovačević, A.,& Milošević, M.. (2020). Investigation of mechanical characteristics of composite plates under tensile loading. in ENERGY, ECONOMY, ECOLOGY Journal of Scientific and Research Publications, Volume X, Issue X.
https://doi.org/ISSN 0354-8651

Baltić M, Hasan SM, Daou D, Milovanović A, Kovačević A, Milošević M. Investigation of mechanical characteristics of composite plates under tensile loading. in ENERGY, ECONOMY, ECOLOGY Journal of Scientific and Research Publications. 2020;Volume X, Issue X.
doi:ISSN 0354-8651 .

Baltić, Marija, Hasan, Sakib Mohammad, Daou, David, Milovanović, Aleksa, Kovačević, Aleksandar, Milošević, Miloš, "Investigation of mechanical characteristics of composite plates under tensile loading" in ENERGY, ECONOMY, ECOLOGY Journal of Scientific and Research Publications, Volume X, Issue X (2020),
https://doi.org/ISSN 0354-8651 . .

TY  - CONF
AU  - Živojinović, Danijela
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4282
AB  - Aditivna proizvodnja pomaže organizacijama da uštede u procesu projektovanja i da smanje
troškove realizacije prototipova. U ovom radu analizirana je kutija elektronike. Kućište je modelirano u nekom od 3D softverskih paketa, zatim je urađena strukturna analiza i na kraju je izrađen model na 3D štampaču. Kutija je izrađena od biorazgradivog termoplastičnog materijala PLA. Ideja ovog rada je da se pokaže kako aditivna tehnologija može da zameni konvencionalnu tehnologiju na onim mestima koja nisu kritična i rizična. Strukturna analiza pokazala je da plastično kućište može da izdrži opterećenje od 150 daN. To je važno sa aspekta izrade plastičnog proizvoda umesto metalnog.
PB  - Univerzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova sa 42. JUPITER konferencije, 29. CAD/CAM simpozijum
T1  - Kutija elektronike – strukturna analiza i izrada
EP  - 2.46
SP  - 2.41
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4282
ER  - 

@conference{
author = "Živojinović, Danijela and Svorcan, Jelena and Baltić, Marija and Simonović, Aleksandar",
year = "2020",
abstract = "Aditivna proizvodnja pomaže organizacijama da uštede u procesu projektovanja i da smanje
troškove realizacije prototipova. U ovom radu analizirana je kutija elektronike. Kućište je modelirano u nekom od 3D softverskih paketa, zatim je urađena strukturna analiza i na kraju je izrađen model na 3D štampaču. Kutija je izrađena od biorazgradivog termoplastičnog materijala PLA. Ideja ovog rada je da se pokaže kako aditivna tehnologija može da zameni konvencionalnu tehnologiju na onim mestima koja nisu kritična i rizična. Strukturna analiza pokazala je da plastično kućište može da izdrži opterećenje od 150 daN. To je važno sa aspekta izrade plastičnog proizvoda umesto metalnog.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova sa 42. JUPITER konferencije, 29. CAD/CAM simpozijum",
title = "Kutija elektronike – strukturna analiza i izrada",
pages = "2.46-2.41",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4282"
}

Živojinović, D., Svorcan, J., Baltić, M.,& Simonović, A.. (2020). Kutija elektronike – strukturna analiza i izrada. in Zbornik radova sa 42. JUPITER konferencije, 29. CAD/CAM simpozijum
Univerzitet u Beogradu - Mašinski fakultet., 2.41-2.46.
https://hdl.handle.net/21.15107/rcub_machinery_4282

Živojinović D, Svorcan J, Baltić M, Simonović A. Kutija elektronike – strukturna analiza i izrada. in Zbornik radova sa 42. JUPITER konferencije, 29. CAD/CAM simpozijum. 2020;:2.41-2.46.
https://hdl.handle.net/21.15107/rcub_machinery_4282 .

Živojinović, Danijela, Svorcan, Jelena, Baltić, Marija, Simonović, Aleksandar, "Kutija elektronike – strukturna analiza i izrada" in Zbornik radova sa 42. JUPITER konferencije, 29. CAD/CAM simpozijum (2020):2.41-2.46,
https://hdl.handle.net/21.15107/rcub_machinery_4282 .

TY  - CONF
AU  - Baltić, Marija
AU  - Svorcan, Jelena
AU  - Ivanov, Toni
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4255
AB  - Rapid growth and development of modern technologies led to increased application of innovative solutions in conceptual design and modelling in all fields of engineering. In order to answer to the increased requirements for more efficient means of transport, it is necessary to pay special attention to public transport (meant for a large number of passengers) which is essential in large cities. Since daily frequency amounts to several thousands of passengers, appropriate maintenance and inspection of the most loaded parts have to be conducted regularly.
Low-floor articulated bus IK218N was analysed here. Prototype was completely developed and produced in the Factory of buses and special vehicles – IKARBUS. After years of exploitation in extreme working conditions in Belgrade, a systematic error in the form of screw joint failure at the connecting point between articulated joint and chassis rear part was established. Extreme working conditions imply overloaded vehicles, inadequate, damaged and bumpy roads as well as irregular maintenance. The whole bus was initially modelled in CATIA, which was followed by the numerical simulation of the connecting screw joint by finite element method in ANSYS. The results of structural analysis showed that the screw joints were the most loaded parts which led to their failure. The screws serve to connect the mount and the articulated joint itself. The following
conclusion was made: during exploitation, the mount beam lost its initial mechanical characteristics, its deformations reached plasticity which reduced locking forces and led to additional shear load on the screw and its final failure. Consequently, the screw joint had to be redesigned and modified. New solution was applied to low-floor articulated bus IK218N.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
T1  - Numerical analysis of screw joint turn table and chassis of low-floor articulated bus IK218N
SP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4255
ER  - 

@conference{
author = "Baltić, Marija and Svorcan, Jelena and Ivanov, Toni",
year = "2020",
abstract = "Rapid growth and development of modern technologies led to increased application of innovative solutions in conceptual design and modelling in all fields of engineering. In order to answer to the increased requirements for more efficient means of transport, it is necessary to pay special attention to public transport (meant for a large number of passengers) which is essential in large cities. Since daily frequency amounts to several thousands of passengers, appropriate maintenance and inspection of the most loaded parts have to be conducted regularly.
Low-floor articulated bus IK218N was analysed here. Prototype was completely developed and produced in the Factory of buses and special vehicles – IKARBUS. After years of exploitation in extreme working conditions in Belgrade, a systematic error in the form of screw joint failure at the connecting point between articulated joint and chassis rear part was established. Extreme working conditions imply overloaded vehicles, inadequate, damaged and bumpy roads as well as irregular maintenance. The whole bus was initially modelled in CATIA, which was followed by the numerical simulation of the connecting screw joint by finite element method in ANSYS. The results of structural analysis showed that the screw joints were the most loaded parts which led to their failure. The screws serve to connect the mount and the articulated joint itself. The following
conclusion was made: during exploitation, the mount beam lost its initial mechanical characteristics, its deformations reached plasticity which reduced locking forces and led to additional shear load on the screw and its final failure. Consequently, the screw joint had to be redesigned and modified. New solution was applied to low-floor articulated bus IK218N.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH",
title = "Numerical analysis of screw joint turn table and chassis of low-floor articulated bus IK218N",
pages = "54",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4255"
}

Baltić, M., Svorcan, J.,& Ivanov, T.. (2020). Numerical analysis of screw joint turn table and chassis of low-floor articulated bus IK218N. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 54.
https://hdl.handle.net/21.15107/rcub_machinery_4255

Baltić M, Svorcan J, Ivanov T. Numerical analysis of screw joint turn table and chassis of low-floor articulated bus IK218N. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH. 2020;:54.
https://hdl.handle.net/21.15107/rcub_machinery_4255 .

Baltić, Marija, Svorcan, Jelena, Ivanov, Toni, "Numerical analysis of screw joint turn table and chassis of low-floor articulated bus IK218N" in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH (2020):54,
https://hdl.handle.net/21.15107/rcub_machinery_4255 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Peković, Ognjen
AU  - Simonović, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4211
AB  - Numerical investigations of several different typical cases of a low-speed light weapon delivery from a representative aircraft wing are performed in ANSYS FLUENT using unstructured overset meshing with dynamic/moving meshes. These simplified three-dimensional, symmetric, 3DOF (degrees-of-freedom) simulations are conducted in order to check the expected missile trajectory after gravity (free fall) separation and assure both aircraft and weapon safety since carrier and missile interference can be rather complex and dangerous in certain (unfavorable) operating conditions. The transient behavior of incompressible flow is computed by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations closed by a two-equation k−ω SST turbulence model, while the rigid body motion is governed by the aerodynamic (pressure and shear) and gravitational forces acting on the weapon. Carrier velocity and flying height, missile mass and inertial properties and CG location as well as its initial position on the aircraft are just some of the factors that can be varied to obtain different flight conditions and resulting flight paths. Here, special attention was given to two input parameters: angle-of-attack and CG longitudinal coordinate. For validation, the obtained numerical results, that include horizontal, vertical and angular displacements of the ejected object, are compared to available experimental data obtained in real flights, wind tunnels etc. as well as values estimated by a simpler numerical model. The satisfactory correspondence between different sets of results proves the applicability of the tested method, i.e. computational approach.
PB  - Belgrade :  Military Technical Institute - VTI
C3  - 9th International scientific conference on defensive technologies OTEH 2020
T1  - Computational analyses of gravitational (free fall) store separation in different flight conditions
EP  - 34
SP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4211
ER  - 

@conference{
author = "Svorcan, Jelena and Baltić, Marija and Peković, Ognjen and Simonović, Aleksandar",
year = "2020",
abstract = "Numerical investigations of several different typical cases of a low-speed light weapon delivery from a representative aircraft wing are performed in ANSYS FLUENT using unstructured overset meshing with dynamic/moving meshes. These simplified three-dimensional, symmetric, 3DOF (degrees-of-freedom) simulations are conducted in order to check the expected missile trajectory after gravity (free fall) separation and assure both aircraft and weapon safety since carrier and missile interference can be rather complex and dangerous in certain (unfavorable) operating conditions. The transient behavior of incompressible flow is computed by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations closed by a two-equation k−ω SST turbulence model, while the rigid body motion is governed by the aerodynamic (pressure and shear) and gravitational forces acting on the weapon. Carrier velocity and flying height, missile mass and inertial properties and CG location as well as its initial position on the aircraft are just some of the factors that can be varied to obtain different flight conditions and resulting flight paths. Here, special attention was given to two input parameters: angle-of-attack and CG longitudinal coordinate. For validation, the obtained numerical results, that include horizontal, vertical and angular displacements of the ejected object, are compared to available experimental data obtained in real flights, wind tunnels etc. as well as values estimated by a simpler numerical model. The satisfactory correspondence between different sets of results proves the applicability of the tested method, i.e. computational approach.",
publisher = "Belgrade :  Military Technical Institute - VTI",
journal = "9th International scientific conference on defensive technologies OTEH 2020",
title = "Computational analyses of gravitational (free fall) store separation in different flight conditions",
pages = "34-29",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4211"
}

Svorcan, J., Baltić, M., Peković, O.,& Simonović, A.. (2020). Computational analyses of gravitational (free fall) store separation in different flight conditions. in 9th International scientific conference on defensive technologies OTEH 2020
Belgrade :  Military Technical Institute - VTI., 29-34.
https://hdl.handle.net/21.15107/rcub_machinery_4211

Svorcan J, Baltić M, Peković O, Simonović A. Computational analyses of gravitational (free fall) store separation in different flight conditions. in 9th International scientific conference on defensive technologies OTEH 2020. 2020;:29-34.
https://hdl.handle.net/21.15107/rcub_machinery_4211 .

Svorcan, Jelena, Baltić, Marija, Peković, Ognjen, Simonović, Aleksandar, "Computational analyses of gravitational (free fall) store separation in different flight conditions" in 9th International scientific conference on defensive technologies OTEH 2020 (2020):29-34,
https://hdl.handle.net/21.15107/rcub_machinery_4211 .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Kreculj, Dragan D.
AU  - Tanović, Dragoljub Lj.
AU  - Kovačević, Aleksandar M.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3321
AB  - Aditivna proizvodnja uključuje izradu proizvoda složene geometrije u relativno malim količinama, kao i izradu alata i kalupa za masovnu proizvodnju. Aditivnom proizvodnjom realizuju se modeli prema digitalnom prikazu, a primena je ogromna u različitim industrijskim sektorima. U poređenju sa tradicionalnom proizvodnjom, glavni parametri u odabiru aditivne tehnologije su: ušteda energije, smanjenje otpada, smanjenje upotrebe većeg broja alata, kao i optimizacija dizajna. Aditivna proizvodnja ili tehnologija 3D štampe rade na principu dodavanja materijala u slojevima, tj. model se formira od slojeva rastopljenog materijala koji se odmah hladi i očvršćava. 3D štampa omogućava čestu i jednostavnu modifikaciju modela na zahtev kupca, a pre ulaska modela u samu proizvodnju. Ovo čini komunikaciju na relaciji proizvođač-kupac dosta jednostavnom. Polazni materijal za izradu modela je polilaktična kiselina (PLA). To je ekološki termoplastični poliester koji se prirodno razgrađuje u prirodi. Na mehaničke karakteristike realizovanog modela od PLA značajno utiču različite tehnološke promenljive kao što su: prečnik brizgaljke, debljina definisanog sloja, procentualna vrednost ispune, veličina uzorka koji se puni, brzina punjenja i temperatura proizvodnje. Cilj ovog rada je da se prikaže postupak realizacije kutije elektronike za malogabaritni transmiter pritiska na 3D štampaču. Time se projektantu daje mogućnost da ispravi postojeće greške, modifikuje proizvod prema zahtevima krajnjih korisnika i na kraju daje polazna osnova za realizaciju prototipa novog proizvoda.
AB  - Additive manufacturing involves manufacturing of products with complex geometry in relatively small quantities, as well as the tools and molds manufacturing for mass production. With additive manufacturing, digital models are being realized and implementation is huge in various industrial sectors. Compared to traditional manufacturing, the main parameters in the choice of additive technology are: energy savings, waste reduction, reduced use of more tools and optimization of design. Additive manufacturing or 3D printing technology works on the principle of adding material in layers, i.e. the model is formed from layers of molten material that is immediately cooled and solidified. 3D printing allows to work with customers to solve design problems before embarking on a launch production. The starting material for the model is polyactic acid (PLA). It is an eco-friendly thermoplastic polyester, that breaks down naturally. The mechanical characteristics of the realized PLA model are significantly influenced by various technological variables, such as following: nozzle diameter, thickness of defined layer, percentage of fill, sample size to be filled, filling rate and production temperature. The aim of this paper is to present the process of realization of an electronics enclosure for a compact pressure transmitter on a 3D printer. This gives the designer the possibility to correct existing errors, modify the product according to the wishes of the end users and finally provides a starting point for the prototype of new product.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Upotreba 3D štampe u analizi dizajna realizovanog proizvoda - slučaj - kutija malogabaritnog transmitera pritiska
T1  - The usage of 3D printing in the analysis of the product design: Case: Electronic enclosure of compact pressure transmitter
EP  - 186
IS  - 2
SP  - 179
VL  - 75
DO  - 10.5937/tehnika2002179V
ER  - 

@article{
author = "Vorkapić, Miloš and Ivanov, Toni and Baltić, Marija and Kreculj, Dragan D. and Tanović, Dragoljub Lj. and Kovačević, Aleksandar M.",
year = "2020",
abstract = "Aditivna proizvodnja uključuje izradu proizvoda složene geometrije u relativno malim količinama, kao i izradu alata i kalupa za masovnu proizvodnju. Aditivnom proizvodnjom realizuju se modeli prema digitalnom prikazu, a primena je ogromna u različitim industrijskim sektorima. U poređenju sa tradicionalnom proizvodnjom, glavni parametri u odabiru aditivne tehnologije su: ušteda energije, smanjenje otpada, smanjenje upotrebe većeg broja alata, kao i optimizacija dizajna. Aditivna proizvodnja ili tehnologija 3D štampe rade na principu dodavanja materijala u slojevima, tj. model se formira od slojeva rastopljenog materijala koji se odmah hladi i očvršćava. 3D štampa omogućava čestu i jednostavnu modifikaciju modela na zahtev kupca, a pre ulaska modela u samu proizvodnju. Ovo čini komunikaciju na relaciji proizvođač-kupac dosta jednostavnom. Polazni materijal za izradu modela je polilaktična kiselina (PLA). To je ekološki termoplastični poliester koji se prirodno razgrađuje u prirodi. Na mehaničke karakteristike realizovanog modela od PLA značajno utiču različite tehnološke promenljive kao što su: prečnik brizgaljke, debljina definisanog sloja, procentualna vrednost ispune, veličina uzorka koji se puni, brzina punjenja i temperatura proizvodnje. Cilj ovog rada je da se prikaže postupak realizacije kutije elektronike za malogabaritni transmiter pritiska na 3D štampaču. Time se projektantu daje mogućnost da ispravi postojeće greške, modifikuje proizvod prema zahtevima krajnjih korisnika i na kraju daje polazna osnova za realizaciju prototipa novog proizvoda., Additive manufacturing involves manufacturing of products with complex geometry in relatively small quantities, as well as the tools and molds manufacturing for mass production. With additive manufacturing, digital models are being realized and implementation is huge in various industrial sectors. Compared to traditional manufacturing, the main parameters in the choice of additive technology are: energy savings, waste reduction, reduced use of more tools and optimization of design. Additive manufacturing or 3D printing technology works on the principle of adding material in layers, i.e. the model is formed from layers of molten material that is immediately cooled and solidified. 3D printing allows to work with customers to solve design problems before embarking on a launch production. The starting material for the model is polyactic acid (PLA). It is an eco-friendly thermoplastic polyester, that breaks down naturally. The mechanical characteristics of the realized PLA model are significantly influenced by various technological variables, such as following: nozzle diameter, thickness of defined layer, percentage of fill, sample size to be filled, filling rate and production temperature. The aim of this paper is to present the process of realization of an electronics enclosure for a compact pressure transmitter on a 3D printer. This gives the designer the possibility to correct existing errors, modify the product according to the wishes of the end users and finally provides a starting point for the prototype of new product.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Upotreba 3D štampe u analizi dizajna realizovanog proizvoda - slučaj - kutija malogabaritnog transmitera pritiska, The usage of 3D printing in the analysis of the product design: Case: Electronic enclosure of compact pressure transmitter",
pages = "186-179",
number = "2",
volume = "75",
doi = "10.5937/tehnika2002179V"
}

Vorkapić, M., Ivanov, T., Baltić, M., Kreculj, D. D., Tanović, D. Lj.,& Kovačević, A. M.. (2020). Upotreba 3D štampe u analizi dizajna realizovanog proizvoda - slučaj - kutija malogabaritnog transmitera pritiska. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 75(2), 179-186.
https://doi.org/10.5937/tehnika2002179V

Vorkapić M, Ivanov T, Baltić M, Kreculj DD, Tanović DL, Kovačević AM. Upotreba 3D štampe u analizi dizajna realizovanog proizvoda - slučaj - kutija malogabaritnog transmitera pritiska. in Tehnika. 2020;75(2):179-186.
doi:10.5937/tehnika2002179V .

Vorkapić, Miloš, Ivanov, Toni, Baltić, Marija, Kreculj, Dragan D., Tanović, Dragoljub Lj., Kovačević, Aleksandar M., "Upotreba 3D štampe u analizi dizajna realizovanog proizvoda - slučaj - kutija malogabaritnog transmitera pritiska" in Tehnika, 75, no. 2 (2020):179-186,
https://doi.org/10.5937/tehnika2002179V . .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Baltić, Marija
AU  - Ivanov, Toni
AU  - Peković, Ognjen
AU  - Milić, Milica
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4298
AB  - Three-dimensional, unsteady, turbulent, incompressible flow simulations of isolated vertical-axis
wind turbine (VAWT) high-solidity rotor consisting of three straight blades at seven different
operational regimes have been performed in ANSYS FLUENT by finite volume method. Aerodynamic analysis of this type of wind turbine rotors is interesting and extremely complex because the blades pass through a wide range of angles-of-attack during one revolution, and many flow instabilities as well as flow separation occur. Furthermore, the simulation of high-solidity rotors is even more difficult, due to the significant interference between the blades, or more precisely, between the wake of the advancing blade and the retracting blade. The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST turbulence model and hybrid Scale-Adaptive Simulation (SAS) used for closure. Quantitative and qualitative examinations of the obtained numerical results are done by comparison to the available wind tunnel data. In particular, aerodynamic loads acting on a blade per revolution as well as power coefficient curves are investigated in detail and comparisons between the two turbulence models are made. Final distinguishing between the simpler and more complex approach to turbulence modeling is made by visualizations of turbulent flow structures separating from the blades throughout a cycle at both non-optimal (starting) and optimal working regimes.
PB  - Belgrade : Serbian Society of Mechanics
C3  - Proceedings / The 7th International Congress of Serbian Society of Mechanics Sremski Karlovci, June 24-26, 2019
T1  - Numerical evaluation of aerodynamic loads and performances of vertical-axis wind turbine rotor
SP  - M3d
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4298
ER  - 

@conference{
author = "Svorcan, Jelena and Baltić, Marija and Ivanov, Toni and Peković, Ognjen and Milić, Milica",
year = "2019",
abstract = "Three-dimensional, unsteady, turbulent, incompressible flow simulations of isolated vertical-axis
wind turbine (VAWT) high-solidity rotor consisting of three straight blades at seven different
operational regimes have been performed in ANSYS FLUENT by finite volume method. Aerodynamic analysis of this type of wind turbine rotors is interesting and extremely complex because the blades pass through a wide range of angles-of-attack during one revolution, and many flow instabilities as well as flow separation occur. Furthermore, the simulation of high-solidity rotors is even more difficult, due to the significant interference between the blades, or more precisely, between the wake of the advancing blade and the retracting blade. The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST turbulence model and hybrid Scale-Adaptive Simulation (SAS) used for closure. Quantitative and qualitative examinations of the obtained numerical results are done by comparison to the available wind tunnel data. In particular, aerodynamic loads acting on a blade per revolution as well as power coefficient curves are investigated in detail and comparisons between the two turbulence models are made. Final distinguishing between the simpler and more complex approach to turbulence modeling is made by visualizations of turbulent flow structures separating from the blades throughout a cycle at both non-optimal (starting) and optimal working regimes.",
publisher = "Belgrade : Serbian Society of Mechanics",
journal = "Proceedings / The 7th International Congress of Serbian Society of Mechanics Sremski Karlovci, June 24-26, 2019",
title = "Numerical evaluation of aerodynamic loads and performances of vertical-axis wind turbine rotor",
pages = "M3d",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4298"
}

Svorcan, J., Baltić, M., Ivanov, T., Peković, O.,& Milić, M.. (2019). Numerical evaluation of aerodynamic loads and performances of vertical-axis wind turbine rotor. in Proceedings / The 7th International Congress of Serbian Society of Mechanics Sremski Karlovci, June 24-26, 2019
Belgrade : Serbian Society of Mechanics., M3d.
https://hdl.handle.net/21.15107/rcub_machinery_4298

Svorcan J, Baltić M, Ivanov T, Peković O, Milić M. Numerical evaluation of aerodynamic loads and performances of vertical-axis wind turbine rotor. in Proceedings / The 7th International Congress of Serbian Society of Mechanics Sremski Karlovci, June 24-26, 2019. 2019;:M3d.
https://hdl.handle.net/21.15107/rcub_machinery_4298 .

Svorcan, Jelena, Baltić, Marija, Ivanov, Toni, Peković, Ognjen, Milić, Milica, "Numerical evaluation of aerodynamic loads and performances of vertical-axis wind turbine rotor" in Proceedings / The 7th International Congress of Serbian Society of Mechanics Sremski Karlovci, June 24-26, 2019 (2019):M3d,
https://hdl.handle.net/21.15107/rcub_machinery_4298 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Trivković, Zorana
AU  - Baltić, Marija
AU  - Peković, Ognjen
AU  - Ivanov, Toni
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4300
AB  - The paper presents a possible approach to a multi-objective optimization of a small-scale vertical-axis wind turbine (VAWT) blade. The starting geometry is simple − the blade is rectangular with a symmetric airfoil NACA 0018. According to its dimensions, the blade corresponds to a VAWT of approximate power of 600 W (applicable to small consumers). Blade structure is a laminate determined by 4 parameters: 2 ply numbers and their orientations. Two-criterion constrained optimizations are performed with respect to blade mass, maximum blade tip deflection, natural frequencies and failure index. Optimization is performed by one of the heuristic, evolutionary algorithms − particle swarm optimization (PSO). Some comments, gained experiences while dealing with a real engineering problem and results concerning possible wind turbine blade structural designs are presented and discussed.
PB  - GLOBAL Society for Research and Development
C3  - Proceedings of GSRD International Conference
T1  - Multi-objective structural optimization of laminate vertical-axis wind turbine blades
EP  - 45
SP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4300
ER  - 

@conference{
author = "Svorcan, Jelena and Trivković, Zorana and Baltić, Marija and Peković, Ognjen and Ivanov, Toni",
year = "2019",
abstract = "The paper presents a possible approach to a multi-objective optimization of a small-scale vertical-axis wind turbine (VAWT) blade. The starting geometry is simple − the blade is rectangular with a symmetric airfoil NACA 0018. According to its dimensions, the blade corresponds to a VAWT of approximate power of 600 W (applicable to small consumers). Blade structure is a laminate determined by 4 parameters: 2 ply numbers and their orientations. Two-criterion constrained optimizations are performed with respect to blade mass, maximum blade tip deflection, natural frequencies and failure index. Optimization is performed by one of the heuristic, evolutionary algorithms − particle swarm optimization (PSO). Some comments, gained experiences while dealing with a real engineering problem and results concerning possible wind turbine blade structural designs are presented and discussed.",
publisher = "GLOBAL Society for Research and Development",
journal = "Proceedings of GSRD International Conference",
title = "Multi-objective structural optimization of laminate vertical-axis wind turbine blades",
pages = "45-42",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4300"
}

Svorcan, J., Trivković, Z., Baltić, M., Peković, O.,& Ivanov, T.. (2019). Multi-objective structural optimization of laminate vertical-axis wind turbine blades. in Proceedings of GSRD International Conference
GLOBAL Society for Research and Development., 42-45.
https://hdl.handle.net/21.15107/rcub_machinery_4300

Svorcan J, Trivković Z, Baltić M, Peković O, Ivanov T. Multi-objective structural optimization of laminate vertical-axis wind turbine blades. in Proceedings of GSRD International Conference. 2019;:42-45.
https://hdl.handle.net/21.15107/rcub_machinery_4300 .

Svorcan, Jelena, Trivković, Zorana, Baltić, Marija, Peković, Ognjen, Ivanov, Toni, "Multi-objective structural optimization of laminate vertical-axis wind turbine blades" in Proceedings of GSRD International Conference (2019):42-45,
https://hdl.handle.net/21.15107/rcub_machinery_4300 .

TY  - CONF
AU  - Baltić, Marija
AU  - Svorcan, Jelena
AU  - Peković, Ognjen
AU  - Ivanov, Toni
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4307
AB  - The paper presents the comparative analysis of the dynamic behaviour of two rectangular plates of different material, aluminium and composite. While their global geometric dimensions (length, width and thickness) are identical, their inner structures are quite different. Whereas aluminium plate can be considered isotropic, composite plate is a unidirectional carbon-epoxy laminate. Modal characteristics of the two plates were determined both numerically and experimentally and a
comparative analysis of the obtained results was performed. Responses of the plates were documented by an optical, contactless 3D digital image correlation (DIC) system that contains a set of high-speed cameras capable of recording the movement of the white-and-black stochastic pattern applied to the upper surfaces of the plates. Numerical simulations were performed by the finite element method (FEM) in the commercial software package ANSYS. The plates were excited by a modal hammer and allowed to freely oscillate. In order to determine the natural frequencies of the plates the recorded time-domain responses were post-processed, i.e. converted to frequency domain by fast Fourier transform (FFT). The first three natural modes were successfully experimentally established and compared to the corresponding numerical values. Since the
differences between the two sets of results are less than 5%, the applied experimental technique can be considered valid and suitable to a wide range of engineering problems involving vibrations.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
T1  - Numerical and experimental modal analysis of aluminium and composite plates
SP  - 45
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4307
ER  - 

@conference{
author = "Baltić, Marija and Svorcan, Jelena and Peković, Ognjen and Ivanov, Toni",
year = "2019",
abstract = "The paper presents the comparative analysis of the dynamic behaviour of two rectangular plates of different material, aluminium and composite. While their global geometric dimensions (length, width and thickness) are identical, their inner structures are quite different. Whereas aluminium plate can be considered isotropic, composite plate is a unidirectional carbon-epoxy laminate. Modal characteristics of the two plates were determined both numerically and experimentally and a
comparative analysis of the obtained results was performed. Responses of the plates were documented by an optical, contactless 3D digital image correlation (DIC) system that contains a set of high-speed cameras capable of recording the movement of the white-and-black stochastic pattern applied to the upper surfaces of the plates. Numerical simulations were performed by the finite element method (FEM) in the commercial software package ANSYS. The plates were excited by a modal hammer and allowed to freely oscillate. In order to determine the natural frequencies of the plates the recorded time-domain responses were post-processed, i.e. converted to frequency domain by fast Fourier transform (FFT). The first three natural modes were successfully experimentally established and compared to the corresponding numerical values. Since the
differences between the two sets of results are less than 5%, the applied experimental technique can be considered valid and suitable to a wide range of engineering problems involving vibrations.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH",
title = "Numerical and experimental modal analysis of aluminium and composite plates",
pages = "45",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4307"
}

Baltić, M., Svorcan, J., Peković, O.,& Ivanov, T.. (2019). Numerical and experimental modal analysis of aluminium and composite plates. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 45.
https://hdl.handle.net/21.15107/rcub_machinery_4307

Baltić M, Svorcan J, Peković O, Ivanov T. Numerical and experimental modal analysis of aluminium and composite plates. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH. 2019;:45.
https://hdl.handle.net/21.15107/rcub_machinery_4307 .

Baltić, Marija, Svorcan, Jelena, Peković, Ognjen, Ivanov, Toni, "Numerical and experimental modal analysis of aluminium and composite plates" in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH (2019):45,
https://hdl.handle.net/21.15107/rcub_machinery_4307 .

TY  - JOUR
AU  - Svorcan, Jelena
AU  - Trivković, Zorana
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Peković, Ognjen
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3187
AB  - Vetroturbine sa vertikalnom osom obrtanja predstavljaju privlačno oruđe za iskorišćenje energije vetra, naročito pogodno za male potrošače ili nepristupačne terene. Iako su jednostavne geometrije (ovde su pretpostavljene prave lopatice konstantnog aeroprofila), njihova aerodinamička analiza može biti izrazito složena. Metode proračunske mehanike fluida iskorišćene su za procenu aerodinamičkih performansi rotora. Rad daje pregled i ocenu mogućih strategija za izvršenje višekriterijumskih optimizacija tokom projektovanja lopatice vetroturbine sa vertikalnom osom obrtanja laminatne strukture koje se odnose na njene glavne strukturne parametre: redosled ređanja i broj slojeva laminata. Brojni proračuni strukture kompozitnih lopatica vetroturbine izvedeni su metodom konačnih elemenata. Višekriterijumske ograničene optimizacije rojem čestica, evolutivnim metodom, izvršene su u odnosu na: ukupnu masu lopatice, najveće pomeranje strukture lopatice pri statičkom opterećenju, proračunate sopstvene frekvencije i kriterijum loma po lopatici. Kombinacijom različitih ulaznih i izlaznih parametara (ciljnih funkcija i ograničenja) moguće je definisati veliki broj prihvatljivih, poboljšanih rešenja.
AB  - Vertical-axis wind turbines (VAWTs) are attractive tools for wind energy extraction particularly suitable for small consumers or off-grid areas. Although their geometry is simple (here, rectangular blade of constant airfoil is assumed), aerodynamic analysis may be quite complex. Computational fluid dynamics (CFD) approach is employed for the estimation of rotor aerodynamic performances. This paper provides a review of possible multi-objective optimization strategies for the design of small-scale VAWT laminate blades in terms of its main structural parameters: ply-order and ply-number. Numerous structural analyses of the composite turbine blades were performed by finite element method (FEM). Multi-criteria constrained optimizations, by an evolutionary method - particle swarm optimization (PSO), were performed with respect to blade total mass, maximum blade tip deflection under static loading, computed natural frequencies and failure index along the blade. By combining different input and output parameters (cost functions and constraints) a large variety of feasible solutions can be achieved.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Višekriterijumske ograničene optimizacije kompozitnih lopatica vetroturbina sa vertikalnom osom obrtanja bazirane na konačno-elementnoj analizi i optimizaciji brojem čestica
T1  - Multi-objective constrained optimizations of VAWT composite blades based on FEM and PSO
EP  - 893
IS  - 4
SP  - 887
VL  - 47
DO  - 10.5937/fmet1904887S
ER  - 

@article{
author = "Svorcan, Jelena and Trivković, Zorana and Ivanov, Toni and Baltić, Marija and Peković, Ognjen",
year = "2019",
abstract = "Vetroturbine sa vertikalnom osom obrtanja predstavljaju privlačno oruđe za iskorišćenje energije vetra, naročito pogodno za male potrošače ili nepristupačne terene. Iako su jednostavne geometrije (ovde su pretpostavljene prave lopatice konstantnog aeroprofila), njihova aerodinamička analiza može biti izrazito složena. Metode proračunske mehanike fluida iskorišćene su za procenu aerodinamičkih performansi rotora. Rad daje pregled i ocenu mogućih strategija za izvršenje višekriterijumskih optimizacija tokom projektovanja lopatice vetroturbine sa vertikalnom osom obrtanja laminatne strukture koje se odnose na njene glavne strukturne parametre: redosled ređanja i broj slojeva laminata. Brojni proračuni strukture kompozitnih lopatica vetroturbine izvedeni su metodom konačnih elemenata. Višekriterijumske ograničene optimizacije rojem čestica, evolutivnim metodom, izvršene su u odnosu na: ukupnu masu lopatice, najveće pomeranje strukture lopatice pri statičkom opterećenju, proračunate sopstvene frekvencije i kriterijum loma po lopatici. Kombinacijom različitih ulaznih i izlaznih parametara (ciljnih funkcija i ograničenja) moguće je definisati veliki broj prihvatljivih, poboljšanih rešenja., Vertical-axis wind turbines (VAWTs) are attractive tools for wind energy extraction particularly suitable for small consumers or off-grid areas. Although their geometry is simple (here, rectangular blade of constant airfoil is assumed), aerodynamic analysis may be quite complex. Computational fluid dynamics (CFD) approach is employed for the estimation of rotor aerodynamic performances. This paper provides a review of possible multi-objective optimization strategies for the design of small-scale VAWT laminate blades in terms of its main structural parameters: ply-order and ply-number. Numerous structural analyses of the composite turbine blades were performed by finite element method (FEM). Multi-criteria constrained optimizations, by an evolutionary method - particle swarm optimization (PSO), were performed with respect to blade total mass, maximum blade tip deflection under static loading, computed natural frequencies and failure index along the blade. By combining different input and output parameters (cost functions and constraints) a large variety of feasible solutions can be achieved.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Višekriterijumske ograničene optimizacije kompozitnih lopatica vetroturbina sa vertikalnom osom obrtanja bazirane na konačno-elementnoj analizi i optimizaciji brojem čestica, Multi-objective constrained optimizations of VAWT composite blades based on FEM and PSO",
pages = "893-887",
number = "4",
volume = "47",
doi = "10.5937/fmet1904887S"
}

Svorcan, J., Trivković, Z., Ivanov, T., Baltić, M.,& Peković, O.. (2019). Višekriterijumske ograničene optimizacije kompozitnih lopatica vetroturbina sa vertikalnom osom obrtanja bazirane na konačno-elementnoj analizi i optimizaciji brojem čestica. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 47(4), 887-893.
https://doi.org/10.5937/fmet1904887S

Svorcan J, Trivković Z, Ivanov T, Baltić M, Peković O. Višekriterijumske ograničene optimizacije kompozitnih lopatica vetroturbina sa vertikalnom osom obrtanja bazirane na konačno-elementnoj analizi i optimizaciji brojem čestica. in FME Transactions. 2019;47(4):887-893.
doi:10.5937/fmet1904887S .

Svorcan, Jelena, Trivković, Zorana, Ivanov, Toni, Baltić, Marija, Peković, Ognjen, "Višekriterijumske ograničene optimizacije kompozitnih lopatica vetroturbina sa vertikalnom osom obrtanja bazirane na konačno-elementnoj analizi i optimizaciji brojem čestica" in FME Transactions, 47, no. 4 (2019):887-893,
https://doi.org/10.5937/fmet1904887S . .

TY  - JOUR
AU  - Baltić, Marija
AU  - Svorcan, Jelena
AU  - Perić, Bojan
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Peković, Ognjen
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3124
AB  - In order to investigate both static and dynamic characteristics of composite plates and validate a contemporary, non-invasive experimental technique a comparative experimental and numerical analysis was performed. Three, geometrically the same but different in ply orientation, carbon-epoxy laminates were tested in both healthy and damaged conditions. Damages were inflicted in a shape of horizontal crack. Experiments and numerical simulations were performed by digital image correlation (DIC) and finite element method (FEM), respectively. Obtained time-responses of the tested structures were fast Fourier transformed (FFT) to frequency domain for a clearer understanding of natural frequencies and oscillation modes. Results are presented in tabular and graphical form. The overall correspondence of two sets of structural displacements is satisfactory. Some discrepancies might be contributed to the idealized geometry and restraint consideration. Also, due to the fast damping of higher tones, the errors in determining higher natural frequencies increase but still remain in 5 % range.
PB  - Korean Soc Mechanical Engineers, Seoul
T2  - Journal of Mechanical Science and Technology
T1  - Comparative numerical and experimental investigation of static and dynamic characteristics of composite plates
EP  - 2603
IS  - 6
SP  - 2597
VL  - 33
DO  - 10.1007/s12206-019-0507-7
ER  - 

@article{
author = "Baltić, Marija and Svorcan, Jelena and Perić, Bojan and Vorkapić, Miloš and Ivanov, Toni and Peković, Ognjen",
year = "2019",
abstract = "In order to investigate both static and dynamic characteristics of composite plates and validate a contemporary, non-invasive experimental technique a comparative experimental and numerical analysis was performed. Three, geometrically the same but different in ply orientation, carbon-epoxy laminates were tested in both healthy and damaged conditions. Damages were inflicted in a shape of horizontal crack. Experiments and numerical simulations were performed by digital image correlation (DIC) and finite element method (FEM), respectively. Obtained time-responses of the tested structures were fast Fourier transformed (FFT) to frequency domain for a clearer understanding of natural frequencies and oscillation modes. Results are presented in tabular and graphical form. The overall correspondence of two sets of structural displacements is satisfactory. Some discrepancies might be contributed to the idealized geometry and restraint consideration. Also, due to the fast damping of higher tones, the errors in determining higher natural frequencies increase but still remain in 5 % range.",
publisher = "Korean Soc Mechanical Engineers, Seoul",
journal = "Journal of Mechanical Science and Technology",
title = "Comparative numerical and experimental investigation of static and dynamic characteristics of composite plates",
pages = "2603-2597",
number = "6",
volume = "33",
doi = "10.1007/s12206-019-0507-7"
}

Baltić, M., Svorcan, J., Perić, B., Vorkapić, M., Ivanov, T.,& Peković, O.. (2019). Comparative numerical and experimental investigation of static and dynamic characteristics of composite plates. in Journal of Mechanical Science and Technology
Korean Soc Mechanical Engineers, Seoul., 33(6), 2597-2603.
https://doi.org/10.1007/s12206-019-0507-7

Baltić M, Svorcan J, Perić B, Vorkapić M, Ivanov T, Peković O. Comparative numerical and experimental investigation of static and dynamic characteristics of composite plates. in Journal of Mechanical Science and Technology. 2019;33(6):2597-2603.
doi:10.1007/s12206-019-0507-7 .

Baltić, Marija, Svorcan, Jelena, Perić, Bojan, Vorkapić, Miloš, Ivanov, Toni, Peković, Ognjen, "Comparative numerical and experimental investigation of static and dynamic characteristics of composite plates" in Journal of Mechanical Science and Technology, 33, no. 6 (2019):2597-2603,
https://doi.org/10.1007/s12206-019-0507-7 . .