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• Main Authors: Chun-Wei Pan, 潘濬瑋
• Other Authors: Chen-Ming Kuo
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/58638103334611394184

碩士 === 國立成功大學 === 土木工程學系碩博士班 === 92 === 　　The alignment problem and structural deterioration of railway track are mainly caused by impacts and vibrations by moving trains. In order to learn the effects of train-induced track deterioration, it is necessary to develop an appropriate model to predict vehicle/track interaction. A finite element model simulating vehicle/track dynamic system in the vertical direction is proposed in this research. This model consists of a 1/8 vehicle model, a ballast track with three layers, and a linear wheel/rail contact assumption. By using this model, time histories of forces, displacement, velocities and accelerations of all components of the vehicle and track can be obtained. 　　The analysis discovered that the three-layer model predicts higher dynamic responses than the one-layer model does. The effects of the track model were also discussed. It was found that foundation stiffness is important to track deflections since weak foundation resulted in excess deflection. In the aspect of ballast parameters, high material density and low elastic modulus are effective in reducing track vibration. By reducing stiffness of rail pad, the ballast vibration can also be reduced.