| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 94 === The research is to discuss the chap problem and the vibration reduction problem of the rubber bush elements of its bogie. Because of the chronically
chap problem, we explore the problem through comparing the experiments with the simulations. This vibrating problem is common in Tze Chiang class, the vibrating source has to be located and make improvement on it. The stiffness of the rubber elements is tested to enhance the stiffness and to avoid resonance,and then reduce vibration . Since the chap problem of the gear box occurred chronically, the gear box
was analyzed with finite element software, and tests were carried out to determine the natural frequency and mode shape of the structure and check with FEM prediction. Then the frequency response function of the gear box was both determined both experimentally and analytically, then the amplitude of the forces under chronic impact can be obtained approximately through their ratios As for car body vibration, this research measured the vibration amplitude
and tried to locate the vibrating source. It is revealed that vibration is caused by the rubber bushing, Therefore the stiffness of the rubber bush is tested by experiments and improvement was made and the resonance frequency was be
raised.
After a series of experiments, it reveals that canceling the electromagnetic brake can reduce the shearing strain that the gear box sustains to the least and reduce the chap problem. Comparing the improved bushing with the original one, and it shows that if the train is installed with center pin hole and traction bar rubber bush, the vibrating problem is significantly improved.
Keyword ： Gearbox, Finite element analysis, Modal analysis, Frequency response analysis, Rubber bushing, Static stiffness
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