Carbody Lateral Vibration Control Of High Speed Vehicle Based On Semi-active Damper

For a period of time,China’s high-speed railway has been developing rapidly in terms of technical reserves and operating mileage.Due to the leaps and bounds of train operation speed,many dynamic problems also follow.The problems of lateral vibration and various related modal vibration are typical ones.This thesis focuses on the use of semi-active suspension technology,combined with the practical application of high-speed EMU in China,to carry out related research.The following work has been specifically carried out:(1)The research status of vehicle vibration reduction and semi-active control is summarized,and their respective technical characteristics,advantages and disadvantages are analyzed.The idea of the sky-hook semi-active damper with high reliability,mature technology and easy realization is adopted.And based on this idea,the simulation model is built using MATLAB / Simulink.(2)A simplified three-degree-of-freedom half-body model is established and the vibration reduction principle of the vehicle lateral vibration using lateral damper under random excitation and sinusoidal excitation is intensively studied.The characteristics of the damping parameters are analyzed to demonstrate the rationality of the semi-active damper in improving the dynamic performance of the vehicle system.(3)Based on the basic parameters of an EMU train,a 35-degree-of-freedom vehicle model is established.On this basis,a comprehensive study on the effect with semi-active dampers is carried out from the viewpoint of vehicle ride performance,hunting stability and curve negotiation.Through calculation and analysis of the main index parameters and comparison with the traditional passive suspension,it is found that although the semi-active damper does not have advantages in the improvement of bogie hunting and curve negotiation,but it performs well for the improvement of the vehicle ride comfort,especially the suppression carbody hunting.There,it has high practical value and good application prospects.