TY  - CONF
AU  - Ćosić, Petar
AU  - Petrašinović, Miloš
AU  - Grbović, Aleksandar
AU  - Petrašinović, Danilo
AU  - Petrović, Mihailo
AU  - Petrović, Veljko
AU  - Raičević, Nikola
AU  - Rašuo, Boško
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7730
AB  - Aerospace engineering, as a field in which the reduction of mass has always been one of the primary tasks of its engineers, has made significant progress as a result of numerous developments and advancements in the field of composite materials in the sense of gaining large benefits from the relatively low density that characterizes composites. In the spirit of the increasing use of composite materials on aerospace structures, in this paper we will conduct an experimental and numerical analysis of the strength of a drone arm made of a composite material. Every method of analysis, whether it is analytical, numerical, or experimental, has some advantages and disadvantages. Experimental results are easily affected by random and instrumental errors and numerical methods are highly affected by the chosen physical model. In order to obtain the most reliable analysis solution, a mixture of numerical analysis backed up by experimental data is required. In the hope of bypassing the expensive and time-consuming experiments in the future, in this paper we will conduct a numerical analysis on a drone arm made of composite materials which will then be replicated by an experiment verifying its validity.
PB  - The Serbian Society of Mechanics
C3  - 9th International Congress of the Serbian Society of Mechanics
T1  - Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material
EP  - 300
SP  - 293
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7730
ER  - 

@conference{
author = "Ćosić, Petar and Petrašinović, Miloš and Grbović, Aleksandar and Petrašinović, Danilo and Petrović, Mihailo and Petrović, Veljko and Raičević, Nikola and Rašuo, Boško",
year = "2023",
abstract = "Aerospace engineering, as a field in which the reduction of mass has always been one of the primary tasks of its engineers, has made significant progress as a result of numerous developments and advancements in the field of composite materials in the sense of gaining large benefits from the relatively low density that characterizes composites. In the spirit of the increasing use of composite materials on aerospace structures, in this paper we will conduct an experimental and numerical analysis of the strength of a drone arm made of a composite material. Every method of analysis, whether it is analytical, numerical, or experimental, has some advantages and disadvantages. Experimental results are easily affected by random and instrumental errors and numerical methods are highly affected by the chosen physical model. In order to obtain the most reliable analysis solution, a mixture of numerical analysis backed up by experimental data is required. In the hope of bypassing the expensive and time-consuming experiments in the future, in this paper we will conduct a numerical analysis on a drone arm made of composite materials which will then be replicated by an experiment verifying its validity.",
publisher = "The Serbian Society of Mechanics",
journal = "9th International Congress of the Serbian Society of Mechanics",
title = "Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material",
pages = "300-293",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7730"
}

Ćosić, P., Petrašinović, M., Grbović, A., Petrašinović, D., Petrović, M., Petrović, V., Raičević, N.,& Rašuo, B.. (2023). Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material. in 9th International Congress of the Serbian Society of Mechanics
The Serbian Society of Mechanics., 293-300.
https://hdl.handle.net/21.15107/rcub_machinery_7730

Ćosić P, Petrašinović M, Grbović A, Petrašinović D, Petrović M, Petrović V, Raičević N, Rašuo B. Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material. in 9th International Congress of the Serbian Society of Mechanics. 2023;:293-300.
https://hdl.handle.net/21.15107/rcub_machinery_7730 .

Ćosić, Petar, Petrašinović, Miloš, Grbović, Aleksandar, Petrašinović, Danilo, Petrović, Mihailo, Petrović, Veljko, Raičević, Nikola, Rašuo, Boško, "Experimental and Numerical Analysis of the Strength of a Drone Arm Made of Composite Material" in 9th International Congress of the Serbian Society of Mechanics (2023):293-300,
https://hdl.handle.net/21.15107/rcub_machinery_7730 .

TY  - JOUR
AU  - Raičević, Nikola
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrašinović, Miloš
AU  - Balać, Martina
AU  - Petrović, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6045
AB  - Wind turbines are structures that transform wind energy into other types of energy. In the modern age, wind turbines are closely related to the production of electricity and are considered starters of the green industry. Designing this type of construction is a complex and demanding process. Wind turbine
blades are the most important part of the construction and are usually made of
composite materials that meet the requirements of strength as well as aerodynamic requirements. Due to the high cost of composite materials, numerical modeling programs are very important because they allow the structure to be inspected before production, as well as to identify possible errors and weaknesses. In this way, additional manufacturing costs are avoided and a fully optimized structure is obtained. The finite element method (FEM) is a reliable method that allows the structure to be tested for the occurrence of normal and shear stresses that can lead to unwanted values of deformations on the blade. In this paper, the procedure of static analysis of a wind turbine blade is presented and the results that are important for optimizing the blade structure are analyzed. The purpose of FEM analysis is to find critical sections of the blade and to predict where maximum values of stresses may occur. In this way, it can be concluded whether the chosen material is appropriate and how the structure can be further optimized.
PB  - Springer Cham
T2  - Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022.
T1  - The wind speed impact on stress and deformation of composite wind turbine blade
EP  - 120
SP  - 114
DO  - 10.1007/978-3-031-19499-3_6
ER  - 

@article{
author = "Raičević, Nikola and Petrašinović, Danilo and Grbović, Aleksandar and Petrašinović, Miloš and Balać, Martina and Petrović, Mihailo",
year = "2022",
abstract = "Wind turbines are structures that transform wind energy into other types of energy. In the modern age, wind turbines are closely related to the production of electricity and are considered starters of the green industry. Designing this type of construction is a complex and demanding process. Wind turbine
blades are the most important part of the construction and are usually made of
composite materials that meet the requirements of strength as well as aerodynamic requirements. Due to the high cost of composite materials, numerical modeling programs are very important because they allow the structure to be inspected before production, as well as to identify possible errors and weaknesses. In this way, additional manufacturing costs are avoided and a fully optimized structure is obtained. The finite element method (FEM) is a reliable method that allows the structure to be tested for the occurrence of normal and shear stresses that can lead to unwanted values of deformations on the blade. In this paper, the procedure of static analysis of a wind turbine blade is presented and the results that are important for optimizing the blade structure are analyzed. The purpose of FEM analysis is to find critical sections of the blade and to predict where maximum values of stresses may occur. In this way, it can be concluded whether the chosen material is appropriate and how the structure can be further optimized.",
publisher = "Springer Cham",
journal = "Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022.",
title = "The wind speed impact on stress and deformation of composite wind turbine blade",
pages = "120-114",
doi = "10.1007/978-3-031-19499-3_6"
}

Raičević, N., Petrašinović, D., Grbović, A., Petrašinović, M., Balać, M.,& Petrović, M.. (2022). The wind speed impact on stress and deformation of composite wind turbine blade. in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022.
Springer Cham., 114-120.
https://doi.org/10.1007/978-3-031-19499-3_6

Raičević N, Petrašinović D, Grbović A, Petrašinović M, Balać M, Petrović M. The wind speed impact on stress and deformation of composite wind turbine blade. in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022.. 2022;:114-120.
doi:10.1007/978-3-031-19499-3_6 .

Raičević, Nikola, Petrašinović, Danilo, Grbović, Aleksandar, Petrašinović, Miloš, Balać, Martina, Petrović, Mihailo, "The wind speed impact on stress and deformation of composite wind turbine blade" in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. (2022):114-120,
https://doi.org/10.1007/978-3-031-19499-3_6 . .

TY  - CHAP
AU  - Raičević, Nikola
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrašinović, Miloš
AU  - Balać, Martina
AU  - Petrović, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5554
AB  - Wind turbines are structures that transform wind energy into other types of energy. In the modern age, wind turbines are closely related to the production of electricity and are considered starters of the green industry. Designing this type of construction is a complex and demanding process. Wind turbine blades are the most important part of the construction and are usually made of composite materials that meet the requirements of strength as well as aerodynamic requirements. Due to the high cost of composite materials, numerical modeling programs are very important because they allow the structure to be inspected before production, as well as to identify possible errors and weaknesses. In this way, additional manufacturing costs are avoided and a fully optimized structure is obtained. The finite element method (FEM) is a reliable method that allows the structure to be tested for the occurrence of normal and shear stresses that can lead to unwanted values of deformations on the blade. In this paper, the procedure of static analysis of a wind turbine blade is presented and the results that are important for optimizing the blade structure are analyzed. The purpose of FEM analysis is to find critical sections of the blade and to predict where maximum values of stresses may occur. In this way, it can be concluded whether the chosen material is appropriate and how the structure can be further optimized.
PB  - Springer Nature Switzerland AG
T2  - Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. Lecture Notes in Networks and Systems
T1  - The Wind Speed Impact on Stress and Deformation of Composite Wind Turbine Blade
EP  - 130
SP  - 114
VL  - 564
DO  - 10.1007/978-3-031-19499-3_6
ER  - 

@inbook{
author = "Raičević, Nikola and Petrašinović, Danilo and Grbović, Aleksandar and Petrašinović, Miloš and Balać, Martina and Petrović, Mihailo",
year = "2022",
abstract = "Wind turbines are structures that transform wind energy into other types of energy. In the modern age, wind turbines are closely related to the production of electricity and are considered starters of the green industry. Designing this type of construction is a complex and demanding process. Wind turbine blades are the most important part of the construction and are usually made of composite materials that meet the requirements of strength as well as aerodynamic requirements. Due to the high cost of composite materials, numerical modeling programs are very important because they allow the structure to be inspected before production, as well as to identify possible errors and weaknesses. In this way, additional manufacturing costs are avoided and a fully optimized structure is obtained. The finite element method (FEM) is a reliable method that allows the structure to be tested for the occurrence of normal and shear stresses that can lead to unwanted values of deformations on the blade. In this paper, the procedure of static analysis of a wind turbine blade is presented and the results that are important for optimizing the blade structure are analyzed. The purpose of FEM analysis is to find critical sections of the blade and to predict where maximum values of stresses may occur. In this way, it can be concluded whether the chosen material is appropriate and how the structure can be further optimized.",
publisher = "Springer Nature Switzerland AG",
journal = "Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. Lecture Notes in Networks and Systems",
booktitle = "The Wind Speed Impact on Stress and Deformation of Composite Wind Turbine Blade",
pages = "130-114",
volume = "564",
doi = "10.1007/978-3-031-19499-3_6"
}

Raičević, N., Petrašinović, D., Grbović, A., Petrašinović, M., Balać, M.,& Petrović, M.. (2022). The Wind Speed Impact on Stress and Deformation of Composite Wind Turbine Blade. in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. Lecture Notes in Networks and Systems
Springer Nature Switzerland AG., 564, 114-130.
https://doi.org/10.1007/978-3-031-19499-3_6

Raičević N, Petrašinović D, Grbović A, Petrašinović M, Balać M, Petrović M. The Wind Speed Impact on Stress and Deformation of Composite Wind Turbine Blade. in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. Lecture Notes in Networks and Systems. 2022;564:114-130.
doi:10.1007/978-3-031-19499-3_6 .

Raičević, Nikola, Petrašinović, Danilo, Grbović, Aleksandar, Petrašinović, Miloš, Balać, Martina, Petrović, Mihailo, "The Wind Speed Impact on Stress and Deformation of Composite Wind Turbine Blade" in Experimental Research and Numerical Simulation in Applied Sciences. CNNTech 2022. Lecture Notes in Networks and Systems, 564 (2022):114-130,
https://doi.org/10.1007/978-3-031-19499-3_6 . .

TY  - CONF
AU  - Raičević, Nikola
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrašinović, Miloš
AU  - Petrović, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5629
AB  - Macro programs used in computer modeling programs have become extremely important due to the high complexity of the models as well as the opportunity to create or adapt a specific geometry as soon as possible. Due to the implementation of the Python programming language, the FreeCAD program is highly suitable for creating advanced macros. When modeling aircraft parts (wings and tail surfaces), wind turbine blades, and similar structures, the biggest problem, due to the shape of the outer contour, is drawing the cross-section of the structures. The ImportAirfoil program allows to quickly and easily import and draw the contour of the desired airfoil, as well as modify it. This paper shows the complete procedure for importing and drawing of NACA2410 airfoil.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - 8th International Conference on Industrial Engineering - SIE 2022, Proceedings
T1  - FreeCAD ImportAirfoil Macro - Drawing Airfoil Geometry in an Open-Source CAD Program
EP  - 108
SP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5629
ER  - 

@conference{
author = "Raičević, Nikola and Petrašinović, Danilo and Grbović, Aleksandar and Petrašinović, Miloš and Petrović, Mihailo",
year = "2022",
abstract = "Macro programs used in computer modeling programs have become extremely important due to the high complexity of the models as well as the opportunity to create or adapt a specific geometry as soon as possible. Due to the implementation of the Python programming language, the FreeCAD program is highly suitable for creating advanced macros. When modeling aircraft parts (wings and tail surfaces), wind turbine blades, and similar structures, the biggest problem, due to the shape of the outer contour, is drawing the cross-section of the structures. The ImportAirfoil program allows to quickly and easily import and draw the contour of the desired airfoil, as well as modify it. This paper shows the complete procedure for importing and drawing of NACA2410 airfoil.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "8th International Conference on Industrial Engineering - SIE 2022, Proceedings",
title = "FreeCAD ImportAirfoil Macro - Drawing Airfoil Geometry in an Open-Source CAD Program",
pages = "108-105",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5629"
}

Raičević, N., Petrašinović, D., Grbović, A., Petrašinović, M.,& Petrović, M.. (2022). FreeCAD ImportAirfoil Macro - Drawing Airfoil Geometry in an Open-Source CAD Program. in 8th International Conference on Industrial Engineering - SIE 2022, Proceedings
University of Belgrade - Faculty of Mechanical Engineering., 105-108.
https://hdl.handle.net/21.15107/rcub_machinery_5629

Raičević N, Petrašinović D, Grbović A, Petrašinović M, Petrović M. FreeCAD ImportAirfoil Macro - Drawing Airfoil Geometry in an Open-Source CAD Program. in 8th International Conference on Industrial Engineering - SIE 2022, Proceedings. 2022;:105-108.
https://hdl.handle.net/21.15107/rcub_machinery_5629 .

Raičević, Nikola, Petrašinović, Danilo, Grbović, Aleksandar, Petrašinović, Miloš, Petrović, Mihailo, "FreeCAD ImportAirfoil Macro - Drawing Airfoil Geometry in an Open-Source CAD Program" in 8th International Conference on Industrial Engineering - SIE 2022, Proceedings (2022):105-108,
https://hdl.handle.net/21.15107/rcub_machinery_5629 .

TY  - CONF
AU  - Raičević, Nikola
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrašinović, Miloš
AU  - Petrović, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5739
AB  - Wind energy is one of the most promising sources of renewable energy. The wind energy is converted into mechanical power through blades which are a major part of wind turbines. Nowadays, composite materials have been used for the fabrication of wind turbine blades to reduce blade weight. Fluid flows over the blade's structure surface and creates pressure loads resulting in the deformation of the blade. Numerical modeling methods are applied to estimate flow-induced deformation and they are required for the optimization of composite wind turbine blades. The wind turbine blade is analysed by computational fluid dynamics (CFD), finite element analysis (FEA), and the one-way and two-way system coupling of fluid-structure interaction (FSI) simulations of the composite wind turbine blade. The CFD was used to find the initial pressure load of the structure. Five types of the composite material were analysed to compare the results and define the optimum composite material based on the values of stress and deformation. The finite element analysis was used to test the tensile stiffness of the chosen composite laminate and to study the effect of micro-scale structural porosity on strength of structural materials. FSI simulations were performed for several wind speeds and then the results were analysed through the comparison of normal and shear stresses, blade deformations, force and moment reactions. The results are presented in the terms of the normal and shear stress distribution, and blade deformation with defined positions of the maximum values on the blade structure.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
T1  - Fluid-Structural Analysis and Optimization of Composite Wind Turbine Blade
EP  - 84
SP  - 84
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5739
ER  - 

@conference{
author = "Raičević, Nikola and Petrašinović, Danilo and Grbović, Aleksandar and Petrašinović, Miloš and Petrović, Mihailo",
year = "2022",
abstract = "Wind energy is one of the most promising sources of renewable energy. The wind energy is converted into mechanical power through blades which are a major part of wind turbines. Nowadays, composite materials have been used for the fabrication of wind turbine blades to reduce blade weight. Fluid flows over the blade's structure surface and creates pressure loads resulting in the deformation of the blade. Numerical modeling methods are applied to estimate flow-induced deformation and they are required for the optimization of composite wind turbine blades. The wind turbine blade is analysed by computational fluid dynamics (CFD), finite element analysis (FEA), and the one-way and two-way system coupling of fluid-structure interaction (FSI) simulations of the composite wind turbine blade. The CFD was used to find the initial pressure load of the structure. Five types of the composite material were analysed to compare the results and define the optimum composite material based on the values of stress and deformation. The finite element analysis was used to test the tensile stiffness of the chosen composite laminate and to study the effect of micro-scale structural porosity on strength of structural materials. FSI simulations were performed for several wind speeds and then the results were analysed through the comparison of normal and shear stresses, blade deformations, force and moment reactions. The results are presented in the terms of the normal and shear stress distribution, and blade deformation with defined positions of the maximum values on the blade structure.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022",
title = "Fluid-Structural Analysis and Optimization of Composite Wind Turbine Blade",
pages = "84-84",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5739"
}

Raičević, N., Petrašinović, D., Grbović, A., Petrašinović, M.,& Petrović, M.. (2022). Fluid-Structural Analysis and Optimization of Composite Wind Turbine Blade. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 84-84.
https://hdl.handle.net/21.15107/rcub_machinery_5739

Raičević N, Petrašinović D, Grbović A, Petrašinović M, Petrović M. Fluid-Structural Analysis and Optimization of Composite Wind Turbine Blade. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022. 2022;:84-84.
https://hdl.handle.net/21.15107/rcub_machinery_5739 .

Raičević, Nikola, Petrašinović, Danilo, Grbović, Aleksandar, Petrašinović, Miloš, Petrović, Mihailo, "Fluid-Structural Analysis and Optimization of Composite Wind Turbine Blade" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022 (2022):84-84,
https://hdl.handle.net/21.15107/rcub_machinery_5739 .

TY  - CONF
AU  - Petrašinović, Miloš
AU  - Petrašinović, Danilo
AU  - Grbović, Aleksandar
AU  - Petrović, Veljko M.
AU  - Petrović, Mihailo
AU  - Raičević, Nikola
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5738
AB  - The constant advance in the usage of unmanned aerial vehicles (UAVs) of all types, including electric multicopters (rotary-wing drones), requests further advancement on all project levels in order to create a competitive final product. With the usage of composite materials, mainly carbon fiber in epoxy resin, it is possible to have a very lightweight structure that is strong enough to sustain all anticipated loads. Arms are a crucial part of multicopter structures that are often made entirely of composite materials. Each multicopter arm has at least one electric motor and propeller on one and a connection with the body on the other end. A static load test stand for various sizes of arms is designed and developed in order to test prototypes within the design process and to be able to test the mechanical characteristics of each produced final part that will be later assembled with other parts. The test stand consists of a robust steel frame, part mounting clamps, a movable low-speed hydraulic cylinder with an appropriate hydraulic power pack powered by an electric motor which is controlled by a variable frequency drive, a load cell for force measurement, and a linear displacement transducer for displacement. A custom digital electronic circuit with a microcontroller is developed in order to control the actuator and obtain data from sensors. Also, custom user-friendly software with a graphical user interface is designed to control experiments and process measurements.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
T1  - Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms
EP  - 44
SP  - 44
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5738
ER  - 

@conference{
author = "Petrašinović, Miloš and Petrašinović, Danilo and Grbović, Aleksandar and Petrović, Veljko M. and Petrović, Mihailo and Raičević, Nikola",
year = "2022",
abstract = "The constant advance in the usage of unmanned aerial vehicles (UAVs) of all types, including electric multicopters (rotary-wing drones), requests further advancement on all project levels in order to create a competitive final product. With the usage of composite materials, mainly carbon fiber in epoxy resin, it is possible to have a very lightweight structure that is strong enough to sustain all anticipated loads. Arms are a crucial part of multicopter structures that are often made entirely of composite materials. Each multicopter arm has at least one electric motor and propeller on one and a connection with the body on the other end. A static load test stand for various sizes of arms is designed and developed in order to test prototypes within the design process and to be able to test the mechanical characteristics of each produced final part that will be later assembled with other parts. The test stand consists of a robust steel frame, part mounting clamps, a movable low-speed hydraulic cylinder with an appropriate hydraulic power pack powered by an electric motor which is controlled by a variable frequency drive, a load cell for force measurement, and a linear displacement transducer for displacement. A custom digital electronic circuit with a microcontroller is developed in order to control the actuator and obtain data from sensors. Also, custom user-friendly software with a graphical user interface is designed to control experiments and process measurements.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022",
title = "Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms",
pages = "44-44",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5738"
}

Petrašinović, M., Petrašinović, D., Grbović, A., Petrović, V. M., Petrović, M.,& Raičević, N.. (2022). Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 44-44.
https://hdl.handle.net/21.15107/rcub_machinery_5738

Petrašinović M, Petrašinović D, Grbović A, Petrović VM, Petrović M, Raičević N. Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022. 2022;:44-44.
https://hdl.handle.net/21.15107/rcub_machinery_5738 .

Petrašinović, Miloš, Petrašinović, Danilo, Grbović, Aleksandar, Petrović, Veljko M., Petrović, Mihailo, Raičević, Nikola, "Design and Development of Static Load Test Stand for Various Sizes of Multicopter Arms" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022 (2022):44-44,
https://hdl.handle.net/21.15107/rcub_machinery_5738 .

TY  - CONF
AU  - Raičević, Nikola
AU  - Petrašinović, Miloš
AU  - Petrašinović, Danilo
AU  - Kastratović, Gordana
AU  - Grbović, Aleksandar
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5637
AB  - To become a reliable and widely accepted production process, additive manufacturing (AM) must provide metal structures with the same or better structural integrity than those produced using traditional methods. In the AM process, multiple build attempts are often required to obtain the part of standardized quality. Another crucial issue is the fatigue behaviour of AM structures (particularly in the presence of voids) which must be assessed and predicted with satisfactory accuracy. There are several major challenges connected to this issue, including obtaining the exact material properties and assessing the life of the complex shapes produced using AM. Bearing this in mind, numerical simulations of AM processes, as well as of the fatigue crack growth in structures of complex shapes, become crucial factors in speeding up the industrial implementation of AM. The aim of this paper is to demonstrate current abilities and performances, as well as the restrictions of the numerical methods in simulating AM processes and fatigue crack growth in metallic structures of complex geometry. In this study, numerical simulations were first carried out on the standard CT specimen (Fig. 1), and then on the real shape of an UAV’s attachment used to hold the composite arm and transfer loads to the main body of the UAV (Fig. 2, 3). For this purpose, the finite element method (FEM) was used, and the results of 3D numerical analyses, performed in Ansys Workbench software, were compared to experimental findings.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - 3rd International Workshop on Reliability and Design of Additively Manufactured Materials - RdAMM22, Workshop Programme & Book of Abstracts
T1  - Evaluation of fatigue life of damaged UAV’s attachment produced using additive manufacturing
EP  - 39
SP  - 38
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5637
ER  - 

@conference{
author = "Raičević, Nikola and Petrašinović, Miloš and Petrašinović, Danilo and Kastratović, Gordana and Grbović, Aleksandar",
year = "2022",
abstract = "To become a reliable and widely accepted production process, additive manufacturing (AM) must provide metal structures with the same or better structural integrity than those produced using traditional methods. In the AM process, multiple build attempts are often required to obtain the part of standardized quality. Another crucial issue is the fatigue behaviour of AM structures (particularly in the presence of voids) which must be assessed and predicted with satisfactory accuracy. There are several major challenges connected to this issue, including obtaining the exact material properties and assessing the life of the complex shapes produced using AM. Bearing this in mind, numerical simulations of AM processes, as well as of the fatigue crack growth in structures of complex shapes, become crucial factors in speeding up the industrial implementation of AM. The aim of this paper is to demonstrate current abilities and performances, as well as the restrictions of the numerical methods in simulating AM processes and fatigue crack growth in metallic structures of complex geometry. In this study, numerical simulations were first carried out on the standard CT specimen (Fig. 1), and then on the real shape of an UAV’s attachment used to hold the composite arm and transfer loads to the main body of the UAV (Fig. 2, 3). For this purpose, the finite element method (FEM) was used, and the results of 3D numerical analyses, performed in Ansys Workbench software, were compared to experimental findings.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "3rd International Workshop on Reliability and Design of Additively Manufactured Materials - RdAMM22, Workshop Programme & Book of Abstracts",
title = "Evaluation of fatigue life of damaged UAV’s attachment produced using additive manufacturing",
pages = "39-38",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5637"
}

Raičević, N., Petrašinović, M., Petrašinović, D., Kastratović, G.,& Grbović, A.. (2022). Evaluation of fatigue life of damaged UAV’s attachment produced using additive manufacturing. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials - RdAMM22, Workshop Programme & Book of Abstracts
University of Belgrade - Faculty of Mechanical Engineering., 38-39.
https://hdl.handle.net/21.15107/rcub_machinery_5637

Raičević N, Petrašinović M, Petrašinović D, Kastratović G, Grbović A. Evaluation of fatigue life of damaged UAV’s attachment produced using additive manufacturing. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials - RdAMM22, Workshop Programme & Book of Abstracts. 2022;:38-39.
https://hdl.handle.net/21.15107/rcub_machinery_5637 .

Raičević, Nikola, Petrašinović, Miloš, Petrašinović, Danilo, Kastratović, Gordana, Grbović, Aleksandar, "Evaluation of fatigue life of damaged UAV’s attachment produced using additive manufacturing" in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials - RdAMM22, Workshop Programme & Book of Abstracts (2022):38-39,
https://hdl.handle.net/21.15107/rcub_machinery_5637 .

TY  - CONF
AU  - Petrašinović, Miloš
AU  - Grbović, Aleksandar
AU  - Petrašinović, Danilo
AU  - Raičević, Nikola
AU  - Petrović, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5737
AB  - One of the most important characteristics of the mechanism used for flight simulation is its workspace. The workspace of any mechanism (including parallel mechanisms, which has a closed kinematic chain) is a set of positions and orientations reachable by its end-effector. In order to be able to successfully simulate flight with a motion platform, on which the pilot sits while in training, its workspace has to meet some criteria. Based on previous, it is essential to have a computationally fast and efficient but at the same time also accurate workspace determination process in order to design and optimize the geometry of the mechanism used for the flight simulator. Full flight simulators are most often with parallel mechanisms based on the Stewart platform which has six degrees of freedom inside the workspace. There is no analytical solution for the workspace of this type of mechanism that considers all constraints (such as motion limits of joints) and that can be practically used in the design process. One option is to simply test all significant positions and orientations, this includes defining the range for each axis and value change step (increment between consecutive values) and then testing all possible combinations. In order to lower the number of combinations that must be tested space is divided a few times, first with the coarser step and then with the finer one just around the boundary of the workspace. The final step is defining the boundary surface based on points that are within the workspace.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
T1  - Numerical Method for Workspace Determination of Flight Simulator with Stewart Platform Mechanism
EP  - 43
SP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5737
ER  - 

@conference{
author = "Petrašinović, Miloš and Grbović, Aleksandar and Petrašinović, Danilo and Raičević, Nikola and Petrović, Mihailo",
year = "2022",
abstract = "One of the most important characteristics of the mechanism used for flight simulation is its workspace. The workspace of any mechanism (including parallel mechanisms, which has a closed kinematic chain) is a set of positions and orientations reachable by its end-effector. In order to be able to successfully simulate flight with a motion platform, on which the pilot sits while in training, its workspace has to meet some criteria. Based on previous, it is essential to have a computationally fast and efficient but at the same time also accurate workspace determination process in order to design and optimize the geometry of the mechanism used for the flight simulator. Full flight simulators are most often with parallel mechanisms based on the Stewart platform which has six degrees of freedom inside the workspace. There is no analytical solution for the workspace of this type of mechanism that considers all constraints (such as motion limits of joints) and that can be practically used in the design process. One option is to simply test all significant positions and orientations, this includes defining the range for each axis and value change step (increment between consecutive values) and then testing all possible combinations. In order to lower the number of combinations that must be tested space is divided a few times, first with the coarser step and then with the finer one just around the boundary of the workspace. The final step is defining the boundary surface based on points that are within the workspace.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022",
title = "Numerical Method for Workspace Determination of Flight Simulator with Stewart Platform Mechanism",
pages = "43-43",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5737"
}

Petrašinović, M., Grbović, A., Petrašinović, D., Raičević, N.,& Petrović, M.. (2022). Numerical Method for Workspace Determination of Flight Simulator with Stewart Platform Mechanism. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 43-43.
https://hdl.handle.net/21.15107/rcub_machinery_5737

Petrašinović M, Grbović A, Petrašinović D, Raičević N, Petrović M. Numerical Method for Workspace Determination of Flight Simulator with Stewart Platform Mechanism. in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022. 2022;:43-43.
https://hdl.handle.net/21.15107/rcub_machinery_5737 .

Petrašinović, Miloš, Grbović, Aleksandar, Petrašinović, Danilo, Raičević, Nikola, Petrović, Mihailo, "Numerical Method for Workspace Determination of Flight Simulator with Stewart Platform Mechanism" in International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2022 (2022):43-43,
https://hdl.handle.net/21.15107/rcub_machinery_5737 .

TY  - JOUR
AU  - Petrašinović, Miloš
AU  - Grbović, Aleksandar
AU  - Petrašinović, Danilo
AU  - Petrović, Mihailo G.
AU  - Raičević, Nikola
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3730
AB  - Featured Application Low-cost flight simulators with electric rotary actuators and optimized geometry for flight simulation. Designing the motion platform for the flight simulator is closely coupled with the particular aircraft's flight envelope. While in training, the pilot on the motion platform has to experience the same feeling as in the aircraft. That means that flight simulators need to simulate all flight cases and forces acting upon the pilot during flight. Among many existing mechanisms, parallel mechanisms based on the Stewart platform are suitable because they have six degrees of freedom. In this paper, a real coded mixed integer genetic algorithm (RCMIGA) is applied for geometry optimization of the Stewart platform with rotary actuators (6-RUS) to design a mechanism with appropriate physical limitations of workspace and motion performances. The chosen algorithm proved that it can find the best global solution with all imposed constraints. At the same time, the obtained geometry can be manufactured because integer solutions can be mapped to available discrete values. Geometry is defined with a minimum number of parameters that fully define the mechanism with all constraints. These geometric parameters are then optimized to obtain custom-tailored geometry for aircraft flight simulation.
PB  - MDPI, Basel
T2  - Applied Sciences-Basel
T1  - Real Coded Mixed Integer Genetic Algorithm for Geometry Optimization of Flight Simulator Mechanism Based on Rotary Stewart Platform
IS  - 14
VL  - 12
DO  - 10.3390/app12147085
ER  - 

@article{
author = "Petrašinović, Miloš and Grbović, Aleksandar and Petrašinović, Danilo and Petrović, Mihailo G. and Raičević, Nikola",
year = "2022",
abstract = "Featured Application Low-cost flight simulators with electric rotary actuators and optimized geometry for flight simulation. Designing the motion platform for the flight simulator is closely coupled with the particular aircraft's flight envelope. While in training, the pilot on the motion platform has to experience the same feeling as in the aircraft. That means that flight simulators need to simulate all flight cases and forces acting upon the pilot during flight. Among many existing mechanisms, parallel mechanisms based on the Stewart platform are suitable because they have six degrees of freedom. In this paper, a real coded mixed integer genetic algorithm (RCMIGA) is applied for geometry optimization of the Stewart platform with rotary actuators (6-RUS) to design a mechanism with appropriate physical limitations of workspace and motion performances. The chosen algorithm proved that it can find the best global solution with all imposed constraints. At the same time, the obtained geometry can be manufactured because integer solutions can be mapped to available discrete values. Geometry is defined with a minimum number of parameters that fully define the mechanism with all constraints. These geometric parameters are then optimized to obtain custom-tailored geometry for aircraft flight simulation.",
publisher = "MDPI, Basel",
journal = "Applied Sciences-Basel",
title = "Real Coded Mixed Integer Genetic Algorithm for Geometry Optimization of Flight Simulator Mechanism Based on Rotary Stewart Platform",
number = "14",
volume = "12",
doi = "10.3390/app12147085"
}

Petrašinović, M., Grbović, A., Petrašinović, D., Petrović, M. G.,& Raičević, N.. (2022). Real Coded Mixed Integer Genetic Algorithm for Geometry Optimization of Flight Simulator Mechanism Based on Rotary Stewart Platform. in Applied Sciences-Basel
MDPI, Basel., 12(14).
https://doi.org/10.3390/app12147085

Petrašinović M, Grbović A, Petrašinović D, Petrović MG, Raičević N. Real Coded Mixed Integer Genetic Algorithm for Geometry Optimization of Flight Simulator Mechanism Based on Rotary Stewart Platform. in Applied Sciences-Basel. 2022;12(14).
doi:10.3390/app12147085 .

Petrašinović, Miloš, Grbović, Aleksandar, Petrašinović, Danilo, Petrović, Mihailo G., Raičević, Nikola, "Real Coded Mixed Integer Genetic Algorithm for Geometry Optimization of Flight Simulator Mechanism Based on Rotary Stewart Platform" in Applied Sciences-Basel, 12, no. 14 (2022),
https://doi.org/10.3390/app12147085 . .

TY  - CONF
AU  - Petrašinović, Miloš
AU  - Grbović, Aleksandar
AU  - Petrašinović, Danilo
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3287
AB  - Flight simulators are motion platforms used to train pilots in various flight regimes. Theoretically, they need to simulate all flight cases and all forces acting upon the pilot during flight. In order to successfully simulate real flight, a moving part of the simulator needs to have six degrees of freedom. The pilot's body is moved and oriented in the space according to the video shown to him. Among many existing designs, parallel mechanisms based on the Stewart platform are most frequently used. In this paper, geometry optimization of the Stewart platform with rotary actuators (6-RUS) is done with a genetic algorithm. For the sake of optimization, it is necessary to define a minimum number of parameters that fully define mechanism with all constraints. The purpose of geometry optimization is to find a mechanism with a workspace that is suitable for simulating flight.
PB  - Springer International Publishing Ag, Cham
C3  - Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
T1  - Geometry Optimization of Flight Simulator Mechanism Using Genetic Algorithm
EP  - 358
SP  - 340
VL  - 90
DO  - 10.1007/978-3-030-30853-7_20
ER  - 

@conference{
author = "Petrašinović, Miloš and Grbović, Aleksandar and Petrašinović, Danilo",
year = "2020",
abstract = "Flight simulators are motion platforms used to train pilots in various flight regimes. Theoretically, they need to simulate all flight cases and all forces acting upon the pilot during flight. In order to successfully simulate real flight, a moving part of the simulator needs to have six degrees of freedom. The pilot's body is moved and oriented in the space according to the video shown to him. Among many existing designs, parallel mechanisms based on the Stewart platform are most frequently used. In this paper, geometry optimization of the Stewart platform with rotary actuators (6-RUS) is done with a genetic algorithm. For the sake of optimization, it is necessary to define a minimum number of parameters that fully define mechanism with all constraints. The purpose of geometry optimization is to find a mechanism with a workspace that is suitable for simulating flight.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019",
title = "Geometry Optimization of Flight Simulator Mechanism Using Genetic Algorithm",
pages = "358-340",
volume = "90",
doi = "10.1007/978-3-030-30853-7_20"
}

Petrašinović, M., Grbović, A.,& Petrašinović, D.. (2020). Geometry Optimization of Flight Simulator Mechanism Using Genetic Algorithm. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019
Springer International Publishing Ag, Cham., 90, 340-358.
https://doi.org/10.1007/978-3-030-30853-7_20

Petrašinović M, Grbović A, Petrašinović D. Geometry Optimization of Flight Simulator Mechanism Using Genetic Algorithm. in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019. 2020;90:340-358.
doi:10.1007/978-3-030-30853-7_20 .

Petrašinović, Miloš, Grbović, Aleksandar, Petrašinović, Danilo, "Geometry Optimization of Flight Simulator Mechanism Using Genetic Algorithm" in Computational and Experimental Approaches in Materials Science and Engineering, Cnntech 2019, 90 (2020):340-358,
https://doi.org/10.1007/978-3-030-30853-7_20 . .