Simulation Study on Hydro-Pneumatic Damper with Dual Accumulators on Light Rail Vehicle

In order to describe the behaviors of hydro-pneumatic damper,the physical model of the damper in light rail vehicle was built based on fluid dynamics.Both of the velocity behavior and displacement behavior were obtained.The solid damping valve,which was different from common hydraulic damper with metal valve plate was introduced in details.The discussion about influences on performance from key parameters was 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 a gas-liquid combination with variable stiffness and nonlinear damp,which is suitable for passenger vehicle whose load is changed largely.