Study On Structure Vibration Of Carbody And Bogie Frame Of High Speed Passenger Car

High speed and structural lightweight of rolling stock have been the two main themes of the present time for high speed train development. High speed can shorten the running time and it also can improve the economic benefits efficiently. However, with the speed increasing, it will increase the excitation frequency between the wheel and rail. The lightweight may reduce the energy consumption and save resources. Due to the structural lightweight design, it will cause the vehicle structure rigidity decreased and lead to the structure natural vibration frequency reduced, which makes it easily to resonate with high frequency excitation induced by speed increased, then worsen the high speed train vehicle system dynamics performance. Therefore, there is the contradiction between high speed and lightweight. The question, which is how to achieve the best match between high speed and lightweight, has been the special matter of concern for the high speed train.Traditionally, vehicle system various parts were considered as rigid bodies in the vehicle system dynamics performance analysis and it can not research the influence of vehicle structural vibration on the vehicle system dynamic performance. In order to research the influence on the vehicle system dynamic performance and achieve the reasonable match between high speed and lightweight, it is necessary to launch the deep research on high speed train structural vibration. Due to the lower structure natural vibration frequency of bogie frame and car body and it makes more influential on vehicle system dynamic performance, this paper mainly researches the influences of structural vibration of bogie frame and car body on vehicle system dynamics performance.This paper bases on finite element analysis (FEA) method and multibody system (MBS) dynamics theory. Rigid flexible coupled vehicle system dynamic models were build up by ANSYS and SMPACK corresponding, and the bogie frame and the car body were considered as flexible bodies in the models. Through simulation and computation analysis, influences of high speed train bogie frame and car body structure vibration on vehicle system dynamics performance were researched.The results and conclusion of this paper can provide a good guide and reference for our country's high speed train engineering design.