Research On Dynamic Simulation Method Of Relative Motion System

The dynamic interaction problems with relative motion structure exist widely in various engineering fields such as civil engineering,machinery,and astronautics.According to the development plan of China's medium and long-term railway network,high-speed railway has gradually become the "artery" of China's inland transportation.With the continuous improvement of the speed of the train,the dynamic interaction between the problem of train and the surrounding track,bridge and the problem of the pantograph and the catenary have become the focus of the research.Because of the complexity of the interaction between vehicles,bridges,the pantograph and the catenary,not only the mathematical model used for solving the above problems must be considered when solving the above problems,but the numerical method used is also a key point.This paper aims at "Research on dynamic simulation method with relative motion structure",based on the problems of coupling of cars and bridges and the problems of Pantograph-catenary system,systematically studies the non-stationary random vibration of the structure under moving random loads,the efficient calculation method of the dynamic response of the structure under the moving mass,and the simulation analysis of the dynamic performance of the pantograph-catenary coupling system.The contents of this paper include:1)The purpose and significance of the simulation method for the dynamics of relative motion systems are introduced,and the development status of the analytical methods for the dynamics of relative motion structure systems at home and abroad is summarized.Meanwhile,research progress related to the pseudo excitation method has been described.2)The pseudo excitation method and the Fourier transform correlation theory are used to establish a virtual excitation-Fourier transform method for bridge structures subjected to moving random loads.Different from time-frequency analysis,the established method is based entirely on the frequency domain to solve the problems related to random vibration.In the calculation process,only the "moving function term" needs to be analyzed,the high sampling frequency is not required for the solution,and the calculation efficiency and precision are satisfied.3)The time domain method for solving the moving mass problem is introduced.The frequency domain method for solving the moving load in the previous section is generalized,and a frequency domain method for structural dynamic response under the action of moving mass is established.4)This section is based on the finite element software ANSYS to simulate the high-speed pantograph-catenary system.A simplified model of the catenary and the pantograph is established.Then the contact with the catenary and the pantograph are directly coupled together to obtain the overall model of the pantograph-catenary system.The dynamic equation of the pantograph-catenary coupling system was constructed and solved in the time domain.The influence of different physical parameters such as speed and tension on the dynamic performance of the pantograph-catenary system was discussed.