Simulation of spatially coupling dynamic response of train-track time-variant system

There exist three problems in the calculation of lateral vibration of the train-track time-variant system at home and abroad and the method to solve them is presented. Spatially coupling vibration analysis model of traintrack time-variant system is put forward. Each vehicle is modeled as a multi-body system with 26 degrees of freedom and the action of coupler is also considered. The track structure is modeled as an assembly of track elements with 30 degrees of freedom, then the spatially coupling vibration matrix equation of the train-track time-variant system is established on the basis of the principle of total potential energy with stationary value and the “set-in-right-position” rule. The track vertical geometric irregularity is considered as the excitation source of the vertical vibration of the system, and the hunting wave of car bogie frame is taken as the excitation source of lateral vibration of the system. The spatially coupling vibration matrix equation of the system is solved by Wilson-ϑ direct integration method. The approximation of the calculated results to the spot test results demonstrates the feasibility and effectiveness of the presented analysis method. Finally, some other vibration responses of the system are also obtained. Foundation item: Project (50078006) supported by the National Natural Science Foundation of China; Project (2001G029) supported by the Foundation of the Science and Technology Section of the Railway Bureau