Study On The Vibration Characteristics And Ride Quality Of Railway Vehicle

Accompanied by the rapid development of the railway transportation globally, the railway transportation in china is stepping into a new stage. The overall speeding-up program and the construction of the high-speed railways has symbolized the opening of the new curtain concerning "the high-speed of passenger transport and the heavy loading of the freight".Under this form, it is very necessary to study modal analysis and analyze vibration characteristics of the vehicle system.From integrated using the methods of simulation and experimental analysis, we in-depth study the vibration characteristics of railway vehicle systems and the relationship between modal parameters and the stability indicators.This paper begins by describing the research situation at home and abroad, as well as the development of railway vehicle status, introduced the vibration modal analysis applications at home and abroad, in particular the status of the railway industry applications.Afterwards, we introduce the study of the basic theory on the vibration characteristics of vehicles, and establish the realistic multi-DOF vibration model of vehicle systems. We also derive the kinetic equation and vibration transfer function, and analyze the two-axis rolling stock vehicles as well as four-axis vibration transmission relations and conduct spectral analysis, and dynamic amplification characteristics. Through the test of actual vehicle systems, further study the vibration characteristics.Then this paper analyzes the dynamic response of vehicle systems, inspirited by the track spectrum density. According to the principle of superposition, it analyzes the modal contributions for the response of vehicles under the excitation of the track spectrum density. It also study the relative importance of various modes as well as the effectiveness of choice of input degrees of freedom in a given band.Finally, from using the calculation model, the paper study the relationship between modal parameters of vehicles and stability index under the excitation of the track spectrum density. Through the numerical calculation using Matlab program.it analyzes the impact with the changes in modal parameters for vehicle stability indicators.