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Interier Vibration Analysis of Moving Train
Železník, Gabriel ; Lošák, Petr (referee) ; Hadaš, Zdeněk (advisor)
In this work, a multibody system of a passing train on a railway is created. The model is focused on the vibrations, which are related to defect conditions. The subject of this work is to investigate the effect of vibrations in the interior of a rail vehicle. In the first part of the work, research of published dynamic models is performed. Various options for track and train modeling are described. Furthermore, the research presents several solution methods that can be used to simulate the moving train. Based on the research, the structure of the model and the method of solution were determined. The main areas of interest are the track, on which vibrations occur in contact with the wheel, and the car body, in which the vibrations will be further analyzed. For this reason, both parts were modeled as flexible bodies. The assembled model uses finite element discretization to describe flexible bodies. The time domain simulation is done by using generalized coordinates and modal superposition. The work describes the construction of the model in detail. The whole model is written in the Matlab and all codes are part of the appendix. The model allows change of all the parameters of the track and the car, including their geometric dimensions. The model includes 4 excitation mechanisms simulating the following defects: flat wheel, lifted sleeper, damaged sleeper and rail wear. After the model algorithm is fully described, the simulations without any defect are performed and a behavior of each system component is described. Finally, simulations of defect conditions are performed. Thanks to the combination of all defect conditions the response of the car body for the analysis of vibrations in the interior is compiled. In the last part, the compiled response in the frequency domain is used for the analysis of random vibrations in the vehicle interior in the Ansys environment. A 3D model of the train's ceiling paneling is used for the analysis, on which the effects of static and dynamic loads are compared. The area with the highest stress was determined by random vibration analysis. In the end, the modification of the part is proposed, which leads to the improvement of the strength properties of the assembly.
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Interier Vibration Analysis of Moving Train
Železník, Gabriel ; Lošák, Petr (referee) ; Hadaš, Zdeněk (advisor)
In this work, a multibody system of a passing train on a railway is created. The model is focused on the vibrations, which are related to defect conditions. The subject of this work is to investigate the effect of vibrations in the interior of a rail vehicle. In the first part of the work, research of published dynamic models is performed. Various options for track and train modeling are described. Furthermore, the research presents several solution methods that can be used to simulate the moving train. Based on the research, the structure of the model and the method of solution were determined. The main areas of interest are the track, on which vibrations occur in contact with the wheel, and the car body, in which the vibrations will be further analyzed. For this reason, both parts were modeled as flexible bodies. The assembled model uses finite element discretization to describe flexible bodies. The time domain simulation is done by using generalized coordinates and modal superposition. The work describes the construction of the model in detail. The whole model is written in the Matlab and all codes are part of the appendix. The model allows change of all the parameters of the track and the car, including their geometric dimensions. The model includes 4 excitation mechanisms simulating the following defects: flat wheel, lifted sleeper, damaged sleeper and rail wear. After the model algorithm is fully described, the simulations without any defect are performed and a behavior of each system component is described. Finally, simulations of defect conditions are performed. Thanks to the combination of all defect conditions the response of the car body for the analysis of vibrations in the interior is compiled. In the last part, the compiled response in the frequency domain is used for the analysis of random vibrations in the vehicle interior in the Ansys environment. A 3D model of the train's ceiling paneling is used for the analysis, on which the effects of static and dynamic loads are compared. The area with the highest stress was determined by random vibration analysis. In the end, the modification of the part is proposed, which leads to the improvement of the strength properties of the assembly.
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