Analysis of Hydro-Pneumatic spring on rail vehicle

In order to describe the behaviors of Hydro-Pneumatic spring,the physical model of the damper on light rail vehicle is built based on fluid dynamics.Both of the velocity behavior and displacement behavior are obtained.The solid damping valve,which is different from common hydraulic damper with metal valve plate is introduced in details.The discussion about influences of key parameters on the performance is presented.The conclusion is that velocity and original air pressure are crucial factors to the Hydro-Pneumatic damper.Hydro-Pneumatic damper with dual accumulators is an gas-liquid combination with variable stiffness and nonlinear damp,which is suitable for the passenger vehicle with the great change of the lood.