基于键合图理论的主动油气悬架仿真研究

Simulation of Active Hydro-pneumatic Suspension System Based on Bond Graph

基于2自由度1/4主动油气悬架的振动模型,建立了其对应的键合图模型。根据键合图模型详细推导了具有非线性特性的油气悬架状态方程,充分体现了键合图理论在分析不同能量域耦合系统中的优越性。利用MATLAB强大的计算能力,对状态方程进行仿真,对比了主动油气悬架与被动悬架的特性,结果表明主动控制的油气悬架有效减少了车身加速度,提高了行驶平顺性。

The vibration model of 2 degrees of freedom 1/4 active hydro-pneumatic suspension （AHP） is built in this paper ,which is used to model the hydro-pneumatic suspension through bond graph（BG） .The equation of state of the hydro-pneumatic suspension with nonlinear characteristic is educed based on the BG model .The method reflects the superiority of bond graph in different energy coupling system .By use of the powerful computation ability of MATLAB ,this paper simulates the state equation through it .The active and passive hydro-pneumatic suspensions are compared ,the results show the AHP reduces body acceleration effectively and improve the ride performance .