The model of train-bridge-track interaction and energy transformation in vertical plane
Received:December 15, 2011  Revised:May 15, 2012
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KeyWord:train-bridge-track interaction  longitudinal vibration  energy  motion functions  train-bridge system  finite element method
肖祥 武汉理工大学 交通学院,武汉 ;中南大学 土木工程学院,长沙 ;中南大学 高速铁路建造技术国家工程实验室,长沙
张谢东 武汉理工大学 交通学院,武汉
任伟新 合肥工业大学 土木工程学院,合肥 ;中南大学 土木工程学院,长沙 ;中南大学 高速铁路建造技术国家工程实验室,长沙
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      The refined motion equation of longitudinal vibration of the train-bridge-track system in vertical plane considering the longitudinal vibration of the vehicle and energy conversion is established in this paper.Taking the train-bridge/track as a whole system,and the longitudinal vibration of the vehicle rigid bodies as independent degree of freedom,and the driving or braking function is simulated by wheel/rail longitudinal force or wheel set moment,and the bridge and track are discretized by beam elements while the rail foundation connecting bridge and track are simulated by equably distributed spring dampers,the refined motion equation in vertical plane considering the longitudinal vibration of the vehicle and energy conversion is developed,which can model the energy conversion between the train and bridge reasonably.Numerical simply supported beam examples demonstrate that:without considering track structure,the velocity of vehicles running on the bridge without driving or braking operation process first increases and then decreases,otherwise it decreases and the wheel sets outputs high frequency longitudinal vibration.The longitudinal vibration of the vehicle body and wheel sets is sensitive to track irregularity.In addition,rail acceleration response is slightly higher compared with the traditional model.This study can provide research foundation for the simulation of dynamic shift operation of actual vehicle and the developed of more refined space coupling model.