Survey on dynamics model of hydropneumatic suspension

SHI Xiaotian1, YOU Xiaomei1, CHAI Guoying2, YANG Guichun2

(1. School of Mechanical Engineering, Shenyang Ligong University, Shenyang 110159, China;

2. China North Engine Research Institute, Tianjin 300400, China)

Abstract: Aiming at the problem that its interior complex structure brought difficulty to its kinetic analysis and design, the analysis and summary on dynamics modeling research achievements of hydropneumatic Suspension were listed, the research status of hydropneumatic suspension was summarized, then the review of theoretical guidance significance was put forward, and the difficulty of modeling lying in its various nonlinear factors was indicated. Based on the theory of thermodynamics and hydromechanics, the numerical model of hydropneumatic cylinder was established, then the relationship of force, displacement and velocity were got. In addition, some unresolved problems about compressibility of hydraulic oil, pressurevolume relationship, friction and solubility of gas were outlined. What′s more, some improvement measures and methods were discussed. The results above indicate that temperature factor, improving gaseity equation, and combining the theory with practice are the possible focus of future research.

Key words: hydropneumatic suspension; nonlinear dynamics; dynamic model