Effect of non-deterministic parameters on hydro-pneumatic suspension system performance

Mathematic model of 2-DOF quarter-car hydro-pneumatic suspension system is established and the corresponding simulation model is also created with Matlab6.5/Simulink5.0.The effect of non-deterministic parameters of hydro-pneumatic spring on suspension system performances,such as ride comfort,suspension stroke and road holding,are studied.The effect of such non-deterministic parameters as orifice discharge coefficient,oil kinetics viscosity and gas polytropic exponent on suspension system performances is monotone.Thus,in hydro-pneumatic suspension design,the values of these non-deterministic parameters should make the suspension performances meet design requirements under the worst conditions and ensure the suspension system designed will be satisfying performance requirement all the time.Keyworos:hydro-pneumatic spring;suspension system;non-deterministic parameters;performance;effect