Performed by: Grzegorz Czarnecki
Fields of Study: Automatics and Robotics
Supervisor: Witold Ogierman, PhD Eng.
The aim of this engineering project was to perform topological optimization of a rectangular plate and its strength analysis. In this project, the goal of topological optimization was to minimize the susceptibility of the system under the constraint of an imposed level of mass reduction. Different levels of mass reduction and boundary conditions were chosen. As results of topological optimization, the shapes fulfilling the given criteria and optimization constraints were selected. On the basis of generated shapes, numerical models were created and their strength verification was performed using the finite element method. Particular attention was paid to the comparison of obtained values of stress and displacement depending on the assumed level of mass reduction, which allows evaluating the properties of particular shape variants in relation to their mass.
Performed by: Marcin Hatłas
Fields of Study: Mechatronics
Supervisor: Wacław Kuś, DSc PhD Eng. Assoc. Prof.
The project involved the construction of a robot with a control system and the development of its numerical model. Two methods of dynamic analysis of the manipulator were applied, the Denavit-Hartenberg method and Matlab Simulink software were used. The models made in the project reproduce the actual behavior of the manipulator. The ATMega16 microcontroller was used to control the robot, working with A4988 stepper motor controllers.
Performed by: Michał Sambor
Fields of Study: Mechatronics
Supervisor: Wacław Kuś, DSc PhD Eng. Assoc. Prof.
The purpose of this engineering work was to conduct a series of experimental tests for chicken femur bone and then perform FEM analyses. The displacements determined from the experiment were used to identify the material parameters of the bone using FEM. The identification was performed by minimizing the difference between the displacements obtained from the experiment and the displacements obtained using FEM for different values of Young's modulus. The identification resulted in parameters close to the values found in the literature. The paper also compares experimental results obtained for a femur and a femur reinforced with a steel bar (simulating an intramedullary nail). In particular, attention was paid to the mechanism of bone failure in both cases.
Performed by: Adam Prowda
Fields of Study: Mechatronics
Supervisor: Wacław Kuś, DSc PhD Eng. Assoc. Prof.
The goal of this study was to develop a station to visualize the form of natural vibrations and determine them using FEM. As a part of this work, many FEM analyses were performed and dozens of experiments were carried out on the built test stand. The research required testing of several types of sheets and bulk materials used for visualization of the form of natural vibrations.
Performed by: Agnieszka Bajerska,
Iwona Bałuch
Fields of Study: Mechatronics
Opiekun: Witold Beluch, DSc PhD Eng. Assoc. Prof.
The project involved the development of a computer application to support the verification of the correctness and accuracy of the components of shock absorbers. The application was written in Visual Basic for Application (VBA) language.
During the analysis performed by the program, Gaussian diagrams and histograms are created for selected data from both measurements made using measuring machines and manual measurements.
The application works with appropriately prepared Microsoft Excel.
Performed by: Mateusz Smołka
Fields of Study: Mechanical Engineering
Supervisor: Adam Długosz, DSc PhD Eng. Assoc. Prof.
The objective of this project was fatigue testing and numerical analysis of the fatigue test fixture in which the shock absorber housing (ø 50 pipe) is mounted. Statistical tests of the specimen were also performed to determine Wöhler diagrams. The numerical analysis was performed in HyperWorks environment: the preprocessor of the operation was HyperMesh, while the solver was Abaqus. The statistical analysis was performed in an Excel spreadsheet.
In addition, the work checked whether the tested fixture is suitable for fatigue testing, i.e. whether it provides adequate stiffness to the specimen and whether the fixture does not cause plasticization or edge contact instead of surface contact.
This work was performed in cooperation with Tenneco Automotive Eastern Europe Ltd., based in Gliwice.
Performed by: Mateusz Balmas
Fields of Study: Mechanical Engineering
Supervisor: Witold Beluch, DSc PhD Eng. Assoc. Prof.
This project investigated the effect of the orifice disc design on the oil flow through the BOCS valve used in automotive shock absorbers. The orifice disc in this valve has a significant effect on the performance of the shock absorber during decompression, i.e., during the rebound phase of the shock absorber.
Two assemblies of the BOCS valve were built for the measurements performed on the flow machine. Each consisted of the same components except for the valve pistons, which differed in sealing. 33 measurements were taken for each valve (33 different pinhole discs). Analysis of the results was performed using MATLAB and Microsoft Excel.
The work was performed in cooperation with Tenneco Automotive Eastern Europe Ltd., based in Gliwice.
Performed by: Przemysław Sebastjan
Fields of Study: Mechanical Engineering
Supervisor: Adam Długosz, DSc PhD Eng. Assoc. Prof.
The purpose of this research was to design and conduct strength analyses of shock absorber housing fatigue test fixtures. In order to obtain the most accurate results, it was necessary to design fixtures that would not significantly affect the test results, i.e. the fixture should not be overly flexible and should not cause plasticization, adverse notch action, or edge contact instead of surface contact.
Of importance for fatigue testing is the requirement that such a fixture be easy to install and provide axial attachment of the tested shock absorber housing.
By optimizing the geometric form of the bracket, it was possible to change the unfavorable, point-like action of the bracket on the tube to a uniformly distributed one. Additionally, in order to reduce the mass, the wall thickness of the holder was reduced and its stiffness was increased by adding stiffening elements. Thanks to the strength analyses carried out, it was possible to exclude an adverse notch effect with the initial shape of the stiffening rib. It is also important to note that the optimized chuck features practically unchanged stiffness, independent of the bending force angle.
The work was performed in cooperation with Tenneco Automotive Eastern Europe Ltd. Gliwice
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