Dynamic Analyses of a High-Speed Train in the Secondary Suspension System Equipped with Semi-Active Dampers Negotiating on Curved Tracks

• Main Authors: Wen-feng Lee, 李文峰
• Other Authors: Ye-ee Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/67002566284733176816

博士 === 國立臺灣科技大學 === 機械工程系 === 102 === Multiple studies have indicated that when the rigidity of the vehicle suspension system increases, the displacement of the car body and bogie decreases. Although this can enhance the stability of rail vehicles moving at high speed, the vibration produced by wheel/rail interaction mechanism transmitted to the car body via its components which will greatly reduce passenger comfort. This effect is very significant when rail vehicles operating on curved tracks. The objective of this study is applying numerical simulation method to investigate the dynamic behaviors of a high-speed vehicle equipped with a semi-active Skyhook dampers operating on a curved track. In this study, coupling is achieved between vehicle and track systems through the wheel/rail interaction mechanism, and a Skyhook semi-active damper was applied to replace the traditional damper. To closely simulate the actual situation, the model use in this study is considered the car body and rail were Timoshenko beams and the rails possess actual measurement irregularity. Through the Newmark Method, the dynamic responses could be obtained at each time step to analyze the effects of the dynamic behavior of the rail vehicle equipped with semi-active Skyhook dampers. Simulation results showed that the lateral displacement and the lateral acceleration of the car body for a semi-active Skyhook damper can be suppressed up to 33%. This simulation result is in good agreement with the measurements obtained from a running test shown in literature. This indicates that semi-active damper can effectively increase the riding comfort. Especially, the benefit of applying semi-active is highly profound when a rail vehicle runs through a curve with having small curvature radius or having insufficient cant deficiency.