TY  - CONF
AU  - Svorcan, Jelena
AU  - Wang, Kan
AU  - Kovačević, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7248
PB  - Springer, Cham.
C3  - Novel Techniques in Maintenance, Repair, and Overhaul Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2022
T1  - Accounting for the Effects of Experimental Setting in Propeller Flow Computation
EP  - 66
SP  - 61
DO  - 10.1007/978-3-031-42041-2_9
ER  - 

@conference{
author = "Svorcan, Jelena and Wang, Kan and Kovačević, Aleksandar",
year = "2023",
publisher = "Springer, Cham.",
journal = "Novel Techniques in Maintenance, Repair, and Overhaul Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2022",
title = "Accounting for the Effects of Experimental Setting in Propeller Flow Computation",
pages = "66-61",
doi = "10.1007/978-3-031-42041-2_9"
}

Svorcan, J., Wang, K.,& Kovačević, A.. (2023). Accounting for the Effects of Experimental Setting in Propeller Flow Computation. in Novel Techniques in Maintenance, Repair, and Overhaul Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2022
Springer, Cham.., 61-66.
https://doi.org/10.1007/978-3-031-42041-2_9

Svorcan J, Wang K, Kovačević A. Accounting for the Effects of Experimental Setting in Propeller Flow Computation. in Novel Techniques in Maintenance, Repair, and Overhaul Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2022. 2023;:61-66.
doi:10.1007/978-3-031-42041-2_9 .

Svorcan, Jelena, Wang, Kan, Kovačević, Aleksandar, "Accounting for the Effects of Experimental Setting in Propeller Flow Computation" in Novel Techniques in Maintenance, Repair, and Overhaul Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2022 (2023):61-66,
https://doi.org/10.1007/978-3-031-42041-2_9 . .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Kovačević, Aleksandar
AU  - Popović, Lazar
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7073
PB  - Springer
PB  - SARES
C3  - Solutions for Maintenance Repair and Overhaul, Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2021
T1  - Sizing and Performance Analysis of a Single-Seat Tandem Helicopter
EP  - 227
SP  - 219
DO  - 10.1007/978-3-031-38446-2
ER  - 

@conference{
author = "Svorcan, Jelena and Kovačević, Aleksandar and Popović, Lazar and Simonović, Aleksandar",
year = "2023",
publisher = "Springer, SARES",
journal = "Solutions for Maintenance Repair and Overhaul, Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2021",
title = "Sizing and Performance Analysis of a Single-Seat Tandem Helicopter",
pages = "227-219",
doi = "10.1007/978-3-031-38446-2"
}

Svorcan, J., Kovačević, A., Popović, L.,& Simonović, A.. (2023). Sizing and Performance Analysis of a Single-Seat Tandem Helicopter. in Solutions for Maintenance Repair and Overhaul, Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2021
Springer., 219-227.
https://doi.org/10.1007/978-3-031-38446-2

Svorcan J, Kovačević A, Popović L, Simonović A. Sizing and Performance Analysis of a Single-Seat Tandem Helicopter. in Solutions for Maintenance Repair and Overhaul, Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2021. 2023;:219-227.
doi:10.1007/978-3-031-38446-2 .

Svorcan, Jelena, Kovačević, Aleksandar, Popović, Lazar, Simonović, Aleksandar, "Sizing and Performance Analysis of a Single-Seat Tandem Helicopter" in Solutions for Maintenance Repair and Overhaul, Proceedings of the International Symposium on Aviation Technology, MRO, and Operations 2021 (2023):219-227,
https://doi.org/10.1007/978-3-031-38446-2 . .

TY  - CHAP
AU  - Svorcan, Jelena
AU  - Wang, Kan
AU  - Ivey, Christopher
AU  - Kovačević, Aleksandar
PY  - 2022
UR  - https://ctr.stanford.edu/publications/annual-research-briefs/annual-research-briefs-2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7597
PB  - Stanford University, Center for Turbulence Research
T2  - Annual Research Briefs 2022, Center for Turbulence Research​, Stanford University
T1  - Estimating the performance of a small-scale non-isolated propeller in hover using WMLES
EP  - 95
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7597
ER  - 

@inbook{
author = "Svorcan, Jelena and Wang, Kan and Ivey, Christopher and Kovačević, Aleksandar",
year = "2022",
publisher = "Stanford University, Center for Turbulence Research",
journal = "Annual Research Briefs 2022, Center for Turbulence Research​, Stanford University",
booktitle = "Estimating the performance of a small-scale non-isolated propeller in hover using WMLES",
pages = "95-87",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7597"
}

Svorcan, J., Wang, K., Ivey, C.,& Kovačević, A.. (2022). Estimating the performance of a small-scale non-isolated propeller in hover using WMLES. in Annual Research Briefs 2022, Center for Turbulence Research​, Stanford University
Stanford University, Center for Turbulence Research., 87-95.
https://hdl.handle.net/21.15107/rcub_machinery_7597

Svorcan J, Wang K, Ivey C, Kovačević A. Estimating the performance of a small-scale non-isolated propeller in hover using WMLES. in Annual Research Briefs 2022, Center for Turbulence Research​, Stanford University. 2022;:87-95.
https://hdl.handle.net/21.15107/rcub_machinery_7597 .

Svorcan, Jelena, Wang, Kan, Ivey, Christopher, Kovačević, Aleksandar, "Estimating the performance of a small-scale non-isolated propeller in hover using WMLES" in Annual Research Briefs 2022, Center for Turbulence Research​, Stanford University (2022):87-95,
https://hdl.handle.net/21.15107/rcub_machinery_7597 .

TY  - CONF
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
AU  - Vorkapić, Miloš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5430
AB  - Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta (FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5430
ER  - 

@conference{
author = "Kovačević, Aleksandar and Ivanov, Toni and Simonović, Aleksandar and Vorkapić, Miloš",
year = "2022",
abstract = "Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta (FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5430"
}

Kovačević, A., Ivanov, T., Simonović, A.,& Vorkapić, M.. (2022). Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_5430

Kovačević A, Ivanov T, Simonović A, Vorkapić M. Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5430 .

Kovačević, Aleksandar, Ivanov, Toni, Simonović, Aleksandar, Vorkapić, Miloš, "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5430 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Tanović, Dragoljub
AU  - Kovačević, Aleksandar
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4217
AB  - The growing climate change issues and the ongoing energy crisis stipulate
further exploitation of renewable energy sources and the development of systems
capable to efficiently generate clean energy. Among the most promising are wind
turbines, that come in different shapes and sizes. Small-scale wind turbines are
economic and particularly suitable for small consumers and rural areas. They are not
too common, and further research into their performance is necessary. This paper
focuses on the design and aerodynamic performance of a small horizontal-axis wind
turbine. Its rotor geometry is described while its basic aerodynamic coefficients, power
and thrust coefficients, are computed by finite volume method in ANSYS Fluent. Flow
is assumed as incompressible and viscous, while Reynolds-averaged Navier-Stokes
(RANS) equations are closed by different turbulence models. Wind turbine
aerodynamic performance is estimated, and different flow visualizations are provided,
particularly focusing on the wind turbine wake.
PB  - University of East Sarajevo, Faculty of Mechanical Engineering
C3  - 6th International Scientific Conference on Mechanical Engineering Technologies and Applications COMETa 2022
T1  - Computational aerodynamic analysis of a small wind turbine
EP  - 725
SP  - 719
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4217
ER  - 

@conference{
author = "Svorcan, Jelena and Tanović, Dragoljub and Kovačević, Aleksandar",
year = "2022",
abstract = "The growing climate change issues and the ongoing energy crisis stipulate
further exploitation of renewable energy sources and the development of systems
capable to efficiently generate clean energy. Among the most promising are wind
turbines, that come in different shapes and sizes. Small-scale wind turbines are
economic and particularly suitable for small consumers and rural areas. They are not
too common, and further research into their performance is necessary. This paper
focuses on the design and aerodynamic performance of a small horizontal-axis wind
turbine. Its rotor geometry is described while its basic aerodynamic coefficients, power
and thrust coefficients, are computed by finite volume method in ANSYS Fluent. Flow
is assumed as incompressible and viscous, while Reynolds-averaged Navier-Stokes
(RANS) equations are closed by different turbulence models. Wind turbine
aerodynamic performance is estimated, and different flow visualizations are provided,
particularly focusing on the wind turbine wake.",
publisher = "University of East Sarajevo, Faculty of Mechanical Engineering",
journal = "6th International Scientific Conference on Mechanical Engineering Technologies and Applications COMETa 2022",
title = "Computational aerodynamic analysis of a small wind turbine",
pages = "725-719",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4217"
}

Svorcan, J., Tanović, D.,& Kovačević, A.. (2022). Computational aerodynamic analysis of a small wind turbine. in 6th International Scientific Conference on Mechanical Engineering Technologies and Applications COMETa 2022
University of East Sarajevo, Faculty of Mechanical Engineering., 719-725.
https://hdl.handle.net/21.15107/rcub_machinery_4217

Svorcan J, Tanović D, Kovačević A. Computational aerodynamic analysis of a small wind turbine. in 6th International Scientific Conference on Mechanical Engineering Technologies and Applications COMETa 2022. 2022;:719-725.
https://hdl.handle.net/21.15107/rcub_machinery_4217 .

Svorcan, Jelena, Tanović, Dragoljub, Kovačević, Aleksandar, "Computational aerodynamic analysis of a small wind turbine" in 6th International Scientific Conference on Mechanical Engineering Technologies and Applications COMETa 2022 (2022):719-725,
https://hdl.handle.net/21.15107/rcub_machinery_4217 .

TY  - CONF
AU  - Kovačević, Aleksandar
AU  - Svorcan, Jelena
AU  - Ivanov, Toni
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4264
AB  - Various algorithms are used to control modern unmanned aerial systems. However, thanks
to the simplicity of application, the most commonly used control algorithm for aircraft but also
for other dynamic systems in various industries is the PID (Proportional, Integral, Derivative)
controller. For the proper response of the system and fast stabilization during the action of
certain disturbances during its operation, it is necessary to precisely adjust the parameters of
the PID controller. This paper presents a mathematical model of a seesaw system for which a
PID control simulation was performed for different asymmetric geometries. Asymmetric
geometry implies different positions of the rotor relative to the axis of system rotation, as well
as when the rotor disks do not lie in the same plane, which simulates the influence of inaccuracy
in the construction of multi-rotor UAVs. The control simulation shows the possibility of
compensating for the mentioned geometric irregularities to ensure the appropriate behavior of
the system. The limit values of this influence are also shown, at which the PID control
algorithm cannot adequately perform the correction and ensure the correct response of the
system. The obtained simulation results would be verified by making an adequate physical
model and obtaining experimental results for the same input parameters, which may be the
subject of future research work.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering
T1  - Modeling, simulation and control of propeller driven seesaw system with asymmetric geometry using PID controller
SP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4264
ER  - 

@conference{
author = "Kovačević, Aleksandar and Svorcan, Jelena and Ivanov, Toni",
year = "2022",
abstract = "Various algorithms are used to control modern unmanned aerial systems. However, thanks
to the simplicity of application, the most commonly used control algorithm for aircraft but also
for other dynamic systems in various industries is the PID (Proportional, Integral, Derivative)
controller. For the proper response of the system and fast stabilization during the action of
certain disturbances during its operation, it is necessary to precisely adjust the parameters of
the PID controller. This paper presents a mathematical model of a seesaw system for which a
PID control simulation was performed for different asymmetric geometries. Asymmetric
geometry implies different positions of the rotor relative to the axis of system rotation, as well
as when the rotor disks do not lie in the same plane, which simulates the influence of inaccuracy
in the construction of multi-rotor UAVs. The control simulation shows the possibility of
compensating for the mentioned geometric irregularities to ensure the appropriate behavior of
the system. The limit values of this influence are also shown, at which the PID control
algorithm cannot adequately perform the correction and ensure the correct response of the
system. The obtained simulation results would be verified by making an adequate physical
model and obtaining experimental results for the same input parameters, which may be the
subject of future research work.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering",
title = "Modeling, simulation and control of propeller driven seesaw system with asymmetric geometry using PID controller",
pages = "111",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4264"
}

Kovačević, A., Svorcan, J.,& Ivanov, T.. (2022). Modeling, simulation and control of propeller driven seesaw system with asymmetric geometry using PID controller. in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering
University of Belgrade, Faculty of Mechanical Engineering., 111.
https://hdl.handle.net/21.15107/rcub_machinery_4264

Kovačević A, Svorcan J, Ivanov T. Modeling, simulation and control of propeller driven seesaw system with asymmetric geometry using PID controller. in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering. 2022;:111.
https://hdl.handle.net/21.15107/rcub_machinery_4264 .

Kovačević, Aleksandar, Svorcan, Jelena, Ivanov, Toni, "Modeling, simulation and control of propeller driven seesaw system with asymmetric geometry using PID controller" in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering (2022):111,
https://hdl.handle.net/21.15107/rcub_machinery_4264 .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
AU  - Mohammad Sakib, Hasan
AU  - Simonović, Aleksandar
AU  - Trajković, Isaak
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5423
AB  - Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds
EP  - 15
IS  - 8
SP  - 1
VL  - 14
DO  - 10.1177/16878132221120737
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Ivanov, Toni and Kovačević, Aleksandar and Mohammad Sakib, Hasan and Simonović, Aleksandar and Trajković, Isaak",
year = "2022",
abstract = "Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds",
pages = "15-1",
number = "8",
volume = "14",
doi = "10.1177/16878132221120737"
}

Vorkapić, M., Mladenović, I., Ivanov, T., Kovačević, A., Mohammad Sakib, H., Simonović, A.,& Trajković, I.. (2022). Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering
SAGE., 14(8), 1-15.
https://doi.org/10.1177/16878132221120737

Vorkapić M, Mladenović I, Ivanov T, Kovačević A, Mohammad Sakib H, Simonović A, Trajković I. Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering. 2022;14(8):1-15.
doi:10.1177/16878132221120737 .

Vorkapić, Miloš, Mladenović, Ivana, Ivanov, Toni, Kovačević, Aleksandar, Mohammad Sakib, Hasan, Simonović, Aleksandar, Trajković, Isaak, "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-15,
https://doi.org/10.1177/16878132221120737 . .

TY  - JOUR
AU  - Svorcan, Jelena
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4210
AB  - Detailed studies of propeller flows are regaining both interest and significance worldwide, as the number of their different design and applications (particularly for futuristic urban air vehicles) continues to grow. An additional distinctive characteristic of small-scale unmanned air vehicles (UAV) propellers is that they are meant to operate in a wide range of (previously considered atypical) operating conditions, including backward flight, flight in the vicinity of obstacles,
hard/ground surfaces, etc. These specific requirements raise the issue of the effects of ground proximity on their aerodynamic performance. This paper computationally investigates flows around a small-scale, custom-made propeller in ground effect. Different ground distances are considered and novel thrust and power relations (dependencies) on them are proposed. In order to obtain sufficiently reliable and accurate results and capture the most significant flow features, Reynolds-averaged Navier-Stokes (RANS) equations are solved by finite volume method. In addition, interesting flow visualizations are presented. Although the obtained thrust trend correlates well with the conventionally used semi-empirical formula, more realistic estimations are obtained for small ground distances. Furthermore, the positive effects of ground vicinity on rotor aerodynamic performances are once again confirmed and quantified.
PB  - Belgrade :  Military Technical Institute - VTI
T2  - Scientific Technical Review
T1  - Numerical analysis of a propeller in ground effect
EP  - 13
IS  - 2
SP  - 8
VL  - 72
DO  - 10.5937/str2202008S
ER  - 

@article{
author = "Svorcan, Jelena and Kovačević, Aleksandar and Ivanov, Toni and Simonović, Aleksandar",
year = "2022",
abstract = "Detailed studies of propeller flows are regaining both interest and significance worldwide, as the number of their different design and applications (particularly for futuristic urban air vehicles) continues to grow. An additional distinctive characteristic of small-scale unmanned air vehicles (UAV) propellers is that they are meant to operate in a wide range of (previously considered atypical) operating conditions, including backward flight, flight in the vicinity of obstacles,
hard/ground surfaces, etc. These specific requirements raise the issue of the effects of ground proximity on their aerodynamic performance. This paper computationally investigates flows around a small-scale, custom-made propeller in ground effect. Different ground distances are considered and novel thrust and power relations (dependencies) on them are proposed. In order to obtain sufficiently reliable and accurate results and capture the most significant flow features, Reynolds-averaged Navier-Stokes (RANS) equations are solved by finite volume method. In addition, interesting flow visualizations are presented. Although the obtained thrust trend correlates well with the conventionally used semi-empirical formula, more realistic estimations are obtained for small ground distances. Furthermore, the positive effects of ground vicinity on rotor aerodynamic performances are once again confirmed and quantified.",
publisher = "Belgrade :  Military Technical Institute - VTI",
journal = "Scientific Technical Review",
title = "Numerical analysis of a propeller in ground effect",
pages = "13-8",
number = "2",
volume = "72",
doi = "10.5937/str2202008S"
}

Svorcan, J., Kovačević, A., Ivanov, T.,& Simonović, A.. (2022). Numerical analysis of a propeller in ground effect. in Scientific Technical Review
Belgrade :  Military Technical Institute - VTI., 72(2), 8-13.
https://doi.org/10.5937/str2202008S

Svorcan J, Kovačević A, Ivanov T, Simonović A. Numerical analysis of a propeller in ground effect. in Scientific Technical Review. 2022;72(2):8-13.
doi:10.5937/str2202008S .

Svorcan, Jelena, Kovačević, Aleksandar, Ivanov, Toni, Simonović, Aleksandar, "Numerical analysis of a propeller in ground effect" in Scientific Technical Review, 72, no. 2 (2022):8-13,
https://doi.org/10.5937/str2202008S . .

TY  - CONF
AU  - Kovačević, Aleksandar
AU  - Svorcan, Jelena
AU  - Ivanov, Toni
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4259
AB  - The application of composite materials in the aerospace industry has begun since the middle of the 20th century. Their use in various elements of aircraft constructions has extended over time. Primary load carrying elements of some aircraft constructions are made of composite materials due to their excellent mechanical properties as well as the good strength-to-weight ratio. Propellers and fan blades of jet engines are increasingly made of high-quality composite materials. Besides the mechanical properties of the material, production technology has a great impact on composite structure quality.
The production process of two-bladed composite propeller is presented in this paper. Manufacturing of composite propeller for multirotor UAV application with suitable technology and relatively cheap materials is the main motive of this work. According to this motive, both (upper and lower) shells of the propeller are made of balanced plain weave glass fiber with epoxy matrix. The vacuum infusion process is used for shell manufacturing. After the polymerization process of shells (24h, 25°C), unidirectional carbon fabric reinforcements in the root zone and expanding polyurethane core are added during the bonding process. Then, the bonded propeller was cured 4h at 70°C.
The high production process quality of the two-bladed propeller with the previously described technology is partly confirmed in this paper. Namely, the checking of propeller geometry and comparison with the CAD model was performed. Results of that comparison showed that a high degree of agreement between produced and CAD model was obtained. Comparison of static test and numerical structural analysis could be subjects of future work. That would provide the final validation of manufacturing technology quality which is described in this paper.
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  - Production process of composite propeller for multirotor UAV
SP  - 65
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4259
ER  - 

@conference{
author = "Kovačević, Aleksandar and Svorcan, Jelena and Ivanov, Toni",
year = "2021",
abstract = "The application of composite materials in the aerospace industry has begun since the middle of the 20th century. Their use in various elements of aircraft constructions has extended over time. Primary load carrying elements of some aircraft constructions are made of composite materials due to their excellent mechanical properties as well as the good strength-to-weight ratio. Propellers and fan blades of jet engines are increasingly made of high-quality composite materials. Besides the mechanical properties of the material, production technology has a great impact on composite structure quality.
The production process of two-bladed composite propeller is presented in this paper. Manufacturing of composite propeller for multirotor UAV application with suitable technology and relatively cheap materials is the main motive of this work. According to this motive, both (upper and lower) shells of the propeller are made of balanced plain weave glass fiber with epoxy matrix. The vacuum infusion process is used for shell manufacturing. After the polymerization process of shells (24h, 25°C), unidirectional carbon fabric reinforcements in the root zone and expanding polyurethane core are added during the bonding process. Then, the bonded propeller was cured 4h at 70°C.
The high production process quality of the two-bladed propeller with the previously described technology is partly confirmed in this paper. Namely, the checking of propeller geometry and comparison with the CAD model was performed. Results of that comparison showed that a high degree of agreement between produced and CAD model was obtained. Comparison of static test and numerical structural analysis could be subjects of future work. That would provide the final validation of manufacturing technology quality which is described in this paper.",
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 = "Production process of composite propeller for multirotor UAV",
pages = "65",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4259"
}

Kovačević, A., Svorcan, J.,& Ivanov, T.. (2021). Production process of composite propeller for multirotor UAV. 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., 65.
https://hdl.handle.net/21.15107/rcub_machinery_4259

Kovačević A, Svorcan J, Ivanov T. Production process of composite propeller for multirotor UAV. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH. 2021;:65.
https://hdl.handle.net/21.15107/rcub_machinery_4259 .

Kovačević, Aleksandar, Svorcan, Jelena, Ivanov, Toni, "Production process of composite propeller for multirotor UAV" in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH (2021):65,
https://hdl.handle.net/21.15107/rcub_machinery_4259 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Kovačević, Aleksandar
AU  - Hasan, Mohammad Sakib
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4260
AB  - Contemporary, light-weight, unmanned air vehicles almost exclusively imply propeller rotors that enable them to hover, as well as to move vertically and horizontally at acceptable amount of required power (that is usually supplied by electric motors). Rotor main parts are blades − curved, rotational lifting surfaces subject to conjugate aerodynamic, inertial and gravitational loads. Their skin is usually made of composite materials, i.e. glass or carbon fibres (or their combination) immersed in epoxy resin. Additional inner structural elements may include shear webs, spar caps, ribs or foam fillers. The goal of the presented research study is conducting and validating structural analysis of a propeller blade by finite element method. Different structural models (containing just skin, or skin with foam filler), materials (glass or carbon, uni-or biaxial plies), and ply-up sequences (differing in layer numbers and orientations) are considered. The complete blade geometry is modelled, including the root and tip sections. The blade is clamed at the root, while computed aerodynamic, inertial and gravitational forces are distributed along its surface (and volume). Since the blade operates in axisymmetric conditions, it was possible to perform static structural analyses. Obtained results include deflection (and deformation) fields, normal and shear stress distributions along the plies, etc. From the acquired numerical values, it is possible to define an adequate blade structure that will be able to withstand all working loads (multiplied by necessary safety factors) and ensure safe flight of the aircraft. Future research may include modal or fatigue analyses of propeller blades.
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  - Structural analysis of small-scale composite propeller blade
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4260
ER  - 

@conference{
author = "Svorcan, Jelena and Kovačević, Aleksandar and Hasan, Mohammad Sakib",
year = "2021",
abstract = "Contemporary, light-weight, unmanned air vehicles almost exclusively imply propeller rotors that enable them to hover, as well as to move vertically and horizontally at acceptable amount of required power (that is usually supplied by electric motors). Rotor main parts are blades − curved, rotational lifting surfaces subject to conjugate aerodynamic, inertial and gravitational loads. Their skin is usually made of composite materials, i.e. glass or carbon fibres (or their combination) immersed in epoxy resin. Additional inner structural elements may include shear webs, spar caps, ribs or foam fillers. The goal of the presented research study is conducting and validating structural analysis of a propeller blade by finite element method. Different structural models (containing just skin, or skin with foam filler), materials (glass or carbon, uni-or biaxial plies), and ply-up sequences (differing in layer numbers and orientations) are considered. The complete blade geometry is modelled, including the root and tip sections. The blade is clamed at the root, while computed aerodynamic, inertial and gravitational forces are distributed along its surface (and volume). Since the blade operates in axisymmetric conditions, it was possible to perform static structural analyses. Obtained results include deflection (and deformation) fields, normal and shear stress distributions along the plies, etc. From the acquired numerical values, it is possible to define an adequate blade structure that will be able to withstand all working loads (multiplied by necessary safety factors) and ensure safe flight of the aircraft. Future research may include modal or fatigue analyses of propeller blades.",
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 = "Structural analysis of small-scale composite propeller blade",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4260"
}

Svorcan, J., Kovačević, A.,& Hasan, M. S.. (2021). Structural analysis of small-scale composite propeller 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., 63.
https://hdl.handle.net/21.15107/rcub_machinery_4260

Svorcan J, Kovačević A, Hasan MS. Structural analysis of small-scale composite propeller blade. in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH. 2021;:63.
https://hdl.handle.net/21.15107/rcub_machinery_4260 .

Svorcan, Jelena, Kovačević, Aleksandar, Hasan, Mohammad Sakib, "Structural analysis of small-scale composite propeller blade" in The Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH (2021):63,
https://hdl.handle.net/21.15107/rcub_machinery_4260 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Jovanović, Miroslav
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4215
AB  - The main topic that is investigated in the present research is the turbulent flow around small-scale rotor blades in hovering flight condition. Small-scale rotorcraft imply somewhat specific operating conditions such as low Reynolds numbers, considerable viscous effects, degraded aerodynamic performances, flow separation, rotational flow, cyclic load cases, etc. It is therefore very important to perform as accurate as possible flow simulations that will enable obtaining practical aerodynamic data that can be used in subsequent structural and flight mechanics analyses. This paper provides the description of steps that are to be conducted when simulating hovering flow. Here, a quasi-steady approach, that combines RANS equations closed by k-ω SST turbulence model with the multiple reference frames, is adopted. Both quantitative and qualitative results are presented. Furthermore, the numerical model is validated against the obtained experimental data. The correspondence between the two sets of results can be considered satisfactory (relative differences for thrust coefficient amount to 15%, while they are even lower for the torque coefficient), while the effects of Reynolds number are not significant when throttle is above 40%.
PB  - Belgrade : Serbian Society of Mechanics
C3  - Proceedings / The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30, 2021
T1  - Numerical investigation of Reynolds number effects on rotor aerodynamic performances in hover
EP  - 534
SP  - 527
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4215
ER  - 

@conference{
author = "Svorcan, Jelena and Kovačević, Aleksandar and Ivanov, Toni and Jovanović, Miroslav",
year = "2021",
abstract = "The main topic that is investigated in the present research is the turbulent flow around small-scale rotor blades in hovering flight condition. Small-scale rotorcraft imply somewhat specific operating conditions such as low Reynolds numbers, considerable viscous effects, degraded aerodynamic performances, flow separation, rotational flow, cyclic load cases, etc. It is therefore very important to perform as accurate as possible flow simulations that will enable obtaining practical aerodynamic data that can be used in subsequent structural and flight mechanics analyses. This paper provides the description of steps that are to be conducted when simulating hovering flow. Here, a quasi-steady approach, that combines RANS equations closed by k-ω SST turbulence model with the multiple reference frames, is adopted. Both quantitative and qualitative results are presented. Furthermore, the numerical model is validated against the obtained experimental data. The correspondence between the two sets of results can be considered satisfactory (relative differences for thrust coefficient amount to 15%, while they are even lower for the torque coefficient), while the effects of Reynolds number are not significant when throttle is above 40%.",
publisher = "Belgrade : Serbian Society of Mechanics",
journal = "Proceedings / The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30, 2021",
title = "Numerical investigation of Reynolds number effects on rotor aerodynamic performances in hover",
pages = "534-527",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4215"
}

Svorcan, J., Kovačević, A., Ivanov, T.,& Jovanović, M.. (2021). Numerical investigation of Reynolds number effects on rotor aerodynamic performances in hover. in Proceedings / The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30, 2021
Belgrade : Serbian Society of Mechanics., 527-534.
https://hdl.handle.net/21.15107/rcub_machinery_4215

Svorcan J, Kovačević A, Ivanov T, Jovanović M. Numerical investigation of Reynolds number effects on rotor aerodynamic performances in hover. in Proceedings / The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30, 2021. 2021;:527-534.
https://hdl.handle.net/21.15107/rcub_machinery_4215 .

Svorcan, Jelena, Kovačević, Aleksandar, Ivanov, Toni, Jovanović, Miroslav, "Numerical investigation of Reynolds number effects on rotor aerodynamic performances in hover" in Proceedings / The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30, 2021 (2021):527-534,
https://hdl.handle.net/21.15107/rcub_machinery_4215 .

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  - Simonović, Aleksandar
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5432
AB  - The trend of wind turbine development has a special significance in the exploitation of renewable energy sources. At higher altitudes, we have better wind energy utilization higher speed and their conversion are achieved in the best possible use of wind turbines. The development of new technologies opens space for a new generation of wind turbines with a 20MW rated power. In recent years, various feasibility studies have shown that wind turbines with large rotor diameter and high towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on reducing overall mass and damping vibrations due to the use of new materials. In this paper, the evolution of high power wind turbines and an overview of the technological development of the basic components of the turbine will be presented. Perspectives in the further development of wind turbines with rated power above 20MW will be also considered.
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd
C3  - 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
T1  - Wind turbine beyond 20 MW – Technology perspective
EP  - 134
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5432
ER  - 

@conference{
author = "Simonović, Aleksandar and Kovačević, Aleksandar and Ivanov, Toni and Vorkapić, Miloš",
year = "2020",
abstract = "The trend of wind turbine development has a special significance in the exploitation of renewable energy sources. At higher altitudes, we have better wind energy utilization higher speed and their conversion are achieved in the best possible use of wind turbines. The development of new technologies opens space for a new generation of wind turbines with a 20MW rated power. In recent years, various feasibility studies have shown that wind turbines with large rotor diameter and high towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on reducing overall mass and damping vibrations due to the use of new materials. In this paper, the evolution of high power wind turbines and an overview of the technological development of the basic components of the turbine will be presented. Perspectives in the further development of wind turbines with rated power above 20MW will be also considered.",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd",
journal = "8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia",
title = "Wind turbine beyond 20 MW – Technology perspective",
pages = "134-123",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5432"
}

Simonović, A., Kovačević, A., Ivanov, T.,& Vorkapić, M.. (2020). Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd., 123-134.
https://hdl.handle.net/21.15107/rcub_machinery_5432

Simonović A, Kovačević A, Ivanov T, Vorkapić M. Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia. 2020;:123-134.
https://hdl.handle.net/21.15107/rcub_machinery_5432 .

Simonović, Aleksandar, Kovačević, Aleksandar, Ivanov, Toni, Vorkapić, Miloš, "Wind turbine beyond 20 MW – Technology perspective" in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia (2020):123-134,
https://hdl.handle.net/21.15107/rcub_machinery_5432 .

TY  - CONF
AU  - Hasan, Sakib Mohammad
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5429
AB  - U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5429
ER  - 

@conference{
author = "Hasan, Sakib Mohammad and Vorkapić, Miloš and Ivanov, Toni and Kovačević, Aleksandar",
year = "2020",
abstract = "U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5429"
}

Hasan, S. M., Vorkapić, M., Ivanov, T.,& Kovačević, A.. (2020). Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_5429

Hasan SM, Vorkapić M, Ivanov T, Kovačević A. Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_5429 .

Hasan, Sakib Mohammad, Vorkapić, Miloš, Ivanov, Toni, Kovačević, Aleksandar, "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2020),
https://hdl.handle.net/21.15107/rcub_machinery_5429 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Hasan, Mohammad Sakib
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4218
AB  - Over the past decade, multicopter unmanned aircrafts have gained extreme popularity. Since their application spans from children toys to video surveillance, surface mapping, payload delivery, communication, etc, much work is being done worldwide on their promotion and advancement. With many electric components commercially available, it has become imperative to develop customized and optimized mechanical parts. This paper investigates the possibility of defining the optimal two-bladed propeller for an existing small electric motor of known characteristics. The propeller should be geometrically simple to reduce the cost of product ion but still provide the greatest thrust for given angular speed and available torque. While cubic chord and linear pitch distributions along the blade are predefined, the airfoil is parameterized by the Class-Shape Transformation (CST) technique (by 6 input parameters). Rotor performance is estimated by an improved blade element momentum theory (BEMT) while the two-criteria optimization is performed by genetic algorithm (GA).
PB  - SARES
C3  - International Symposium on Electric Aviation and Autonomous Systems ISEAS 2020
T1  - Design of the optimal airfoil for a blade of a small-scale multi-rotor VTOL UAV
EP  - 55
SP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4218
ER  - 

@conference{
author = "Svorcan, Jelena and Hasan, Mohammad Sakib and Kovačević, Aleksandar and Ivanov, Toni",
year = "2020",
abstract = "Over the past decade, multicopter unmanned aircrafts have gained extreme popularity. Since their application spans from children toys to video surveillance, surface mapping, payload delivery, communication, etc, much work is being done worldwide on their promotion and advancement. With many electric components commercially available, it has become imperative to develop customized and optimized mechanical parts. This paper investigates the possibility of defining the optimal two-bladed propeller for an existing small electric motor of known characteristics. The propeller should be geometrically simple to reduce the cost of product ion but still provide the greatest thrust for given angular speed and available torque. While cubic chord and linear pitch distributions along the blade are predefined, the airfoil is parameterized by the Class-Shape Transformation (CST) technique (by 6 input parameters). Rotor performance is estimated by an improved blade element momentum theory (BEMT) while the two-criteria optimization is performed by genetic algorithm (GA).",
publisher = "SARES",
journal = "International Symposium on Electric Aviation and Autonomous Systems ISEAS 2020",
title = "Design of the optimal airfoil for a blade of a small-scale multi-rotor VTOL UAV",
pages = "55-52",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4218"
}

Svorcan, J., Hasan, M. S., Kovačević, A.,& Ivanov, T.. (2020). Design of the optimal airfoil for a blade of a small-scale multi-rotor VTOL UAV. in International Symposium on Electric Aviation and Autonomous Systems ISEAS 2020
SARES., 52-55.
https://hdl.handle.net/21.15107/rcub_machinery_4218

Svorcan J, Hasan MS, Kovačević A, Ivanov T. Design of the optimal airfoil for a blade of a small-scale multi-rotor VTOL UAV. in International Symposium on Electric Aviation and Autonomous Systems ISEAS 2020. 2020;:52-55.
https://hdl.handle.net/21.15107/rcub_machinery_4218 .

Svorcan, Jelena, Hasan, Mohammad Sakib, Kovačević, Aleksandar, Ivanov, Toni, "Design of the optimal airfoil for a blade of a small-scale multi-rotor VTOL UAV" in International Symposium on Electric Aviation and Autonomous Systems ISEAS 2020 (2020):52-55,
https://hdl.handle.net/21.15107/rcub_machinery_4218 .

TY  - JOUR
AU  - Srećković, Milesa
AU  - Milosavljević, Anđelka
AU  - Kovačević, Aleksandar
AU  - Gospavić, Radovan
AU  - Trtica, Milan
AU  - Ristić, Zoran
AU  - Cvetković, Nevenka
AU  - Čantrak, Đorđe
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/800
AB  - Savremene legure na bazi nikla i titanijuma, sa većim brojem novih elemenata, imaju široku primenu. Tako dobijene nove legure titanijuma su od velikog praktičnog značaja u vazduhoplovstvu, a novodobijene legure nikla u energetici i nuklearnoj tehnici. U okviru ovog rada su prikazani rezultati tretiranja legura titanijuma i nikla snopovima lasera u vazduhu, na atmosferskom pritisku, kao i pojedinih uzoraka u vakumskim uslovima. Dobijene laserske modifikacije mikrostruktura uzoraka su analizirane različitim metodama ispitivanja, koje uključuju optičku i elektronsku mikroskopiju (SEM). Savremenim numeričkim metodama je, za izabrane režime rada lasera, simulirano grejanje do tačke topljenja odgovarajućeg materijala.
AB  - Commonly implemented nickel and titanium alloys are nowadays alloyed with many new elements. Obtained in this way, new Ti-alloys are of great practical significance in aircraft industry, while Ni-alloys are important in energetic and nuclear technique. Selected alloys of titanium and nickel have been treated in vacuum by various thermo-mechanical regimes. Most of the samples have been exposed to laser beams in the air, at the atmospheric pressure, while some of the samples have been treated in vacuum conditions. Laser-induced modifications of the samples microstructures have been analyzed by various methods of investigation, which include optical- and electron microscopy (SEM). The heating up of the selected Ni- and Ti-alloys to the melting point, in selected regimes of laser operation, has been simulated by contemporary numerical methods.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Interakcija različitih tipova lasera sa legurama baziranim na niklu i titanijumu
T1  - Interaction of lasers of various types with alloys based on Ni and Ti
EP  - 173
IS  - 4
SP  - 167
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_800
ER  - 

@article{
author = "Srećković, Milesa and Milosavljević, Anđelka and Kovačević, Aleksandar and Gospavić, Radovan and Trtica, Milan and Ristić, Zoran and Cvetković, Nevenka and Čantrak, Đorđe",
year = "2008",
abstract = "Savremene legure na bazi nikla i titanijuma, sa većim brojem novih elemenata, imaju široku primenu. Tako dobijene nove legure titanijuma su od velikog praktičnog značaja u vazduhoplovstvu, a novodobijene legure nikla u energetici i nuklearnoj tehnici. U okviru ovog rada su prikazani rezultati tretiranja legura titanijuma i nikla snopovima lasera u vazduhu, na atmosferskom pritisku, kao i pojedinih uzoraka u vakumskim uslovima. Dobijene laserske modifikacije mikrostruktura uzoraka su analizirane različitim metodama ispitivanja, koje uključuju optičku i elektronsku mikroskopiju (SEM). Savremenim numeričkim metodama je, za izabrane režime rada lasera, simulirano grejanje do tačke topljenja odgovarajućeg materijala., Commonly implemented nickel and titanium alloys are nowadays alloyed with many new elements. Obtained in this way, new Ti-alloys are of great practical significance in aircraft industry, while Ni-alloys are important in energetic and nuclear technique. Selected alloys of titanium and nickel have been treated in vacuum by various thermo-mechanical regimes. Most of the samples have been exposed to laser beams in the air, at the atmospheric pressure, while some of the samples have been treated in vacuum conditions. Laser-induced modifications of the samples microstructures have been analyzed by various methods of investigation, which include optical- and electron microscopy (SEM). The heating up of the selected Ni- and Ti-alloys to the melting point, in selected regimes of laser operation, has been simulated by contemporary numerical methods.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Interakcija različitih tipova lasera sa legurama baziranim na niklu i titanijumu, Interaction of lasers of various types with alloys based on Ni and Ti",
pages = "173-167",
number = "4",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_800"
}

Srećković, M., Milosavljević, A., Kovačević, A., Gospavić, R., Trtica, M., Ristić, Z., Cvetković, N.,& Čantrak, Đ.. (2008). Interakcija različitih tipova lasera sa legurama baziranim na niklu i titanijumu. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 36(4), 167-173.
https://hdl.handle.net/21.15107/rcub_machinery_800

Srećković M, Milosavljević A, Kovačević A, Gospavić R, Trtica M, Ristić Z, Cvetković N, Čantrak Đ. Interakcija različitih tipova lasera sa legurama baziranim na niklu i titanijumu. in FME Transactions. 2008;36(4):167-173.
https://hdl.handle.net/21.15107/rcub_machinery_800 .

Srećković, Milesa, Milosavljević, Anđelka, Kovačević, Aleksandar, Gospavić, Radovan, Trtica, Milan, Ristić, Zoran, Cvetković, Nevenka, Čantrak, Đorđe, "Interakcija različitih tipova lasera sa legurama baziranim na niklu i titanijumu" in FME Transactions, 36, no. 4 (2008):167-173,
https://hdl.handle.net/21.15107/rcub_machinery_800 .