The influence of lateral shock absorber valve parameters on vehicle dynamic performance

Abstract

The shock absorber is important for improving train dynamics characteristics, and its valve parameters determine its performance and also directly affect the train dynamics characteristics. Hydraulic control model of lateral shock absorber is established by using parametric modeling method in Easy5, and CRH2 trailer model is constructed in VI-Rail. Calculation result of shock absorber model’s speed characteristic is embedded into the vehicle model. The accuracy of the vehicle model is verified by a real track-test, and numerical analysis is done about the influence of various parameters on vehicle dynamics performance. The research results show that critical velocity and stability index increase with the increase of damping aperture and through-flow aperture. One-way valve aperture of bottom valve and one-way valve aperture of piston have little influence on those performance. As spring stiffness increases in the range of 800–2000 N/cm, critical velocity increases and stability index decreases, and its influence is little if spring stiffness is beyond this scope. As preload force of spring increases in the range of 100–250 N, critical velocity increases and stability index decreases, and its influence is also little if the preload force of spring is beyond this scope.