利用 MATLAB／Simulink 的油气悬架输出力分析

摘要

Based on the investigation of vibration characteristics of certain vehicle without suspension ,a new type of damping-ad-justable hydro-pneumatic suspension was put forward .Based on the analysis of working principle ,the nonlinear mathematical mod-el and output force characteristic model of suspension were set up .Using MATLAB/Simulink,through adjusting initialization pres-sure and volume of accumulator ,the diameter and number of orifice valve ,the diameter of adjustable throttle and the amplitude and frequency of excitation ,the influences of these parameters to output force characteristics were put forward .Simulation results show that initialization pressure of accumulator doesn ’ t influence the curve shape of displacement and velocity characteristics of output force and doesn ’ t influence the damping force of suspension ,and orifice valve ,adjustable throttle and excitation influence greatly to output force characteristics ,especially to revert phase .%结合某型非公路作业车辆的振动特性设计了一种阻尼可调的油气悬架结构，在分析其工作原理的基础上，建立了油气悬架的输出力数学模型，利用MATLAB／Simulink软件对油气悬架输出力-位移特性和输出力-速度特性进行了仿真研究。通过改变油气悬架的自身结构参数（氮气室内气体的初始工作参数、活塞阻尼孔参数及可调节流阀过流直径等）和位移激励参数（幅值和频率），得到各参数对输出力的影响规律。研究结果表明：氮气室初始充气压力不影响油气悬架输出力-位移特性和输出力-速度特性曲线的形状，而活塞阻尼孔直径与个数、可调节流阀过流直径、外部位移激励的幅值与频率等参数对悬架输出力有较大影响，尤其对复原行程影响显著。