基于AMESim油气悬架非线性输出特性建模分析

根据单气室油气悬架的结构特点,搭建其非线性数学模型,基于AMESim建立仿真模型并搭建油气悬架试验台模型。针对缓慢加载工况和周期激励加载工况,油气悬架特性进行对比分析,并重点考虑油液可压缩的影响,对弹性模量和流量系数进行修正。通过模拟仿真和试验结果对比发现,在缓慢加载工况,由于系统载荷较小,仿真和试验结果基本一致;周期激励加载工况下,在行程比较大时,由于压强和活塞杆搅动的影响,油液中将溶解部分气体,将导致油液整体弹性模量的下降,且对输出结果的影响比较明显,同时对流量系数进行了修正,获得修正后的油气悬架非线性输出特性模型;对比分析验证了模型的准确性,为进一步研究提供参考。

Modeling and Analysis of Non -linear Output Characteristics of Hydro-pneumatic Suspension Based on AMESim

According to the structural characteristics of the oil and gas suspension of single air chamber , a nonlinear mathematical model was set up , and the simulation model was built based on AMESim and the model of the oil and gas suspension test platform was built .The characteristics of oil and gas suspension were compared with analysis under the condition of slow loading and periodic excita -tion, and the influence of the fluid compressibility was analyzed with emphasis on the elastic modulus and the flow coefficient correc -tion.Through comparison of the simulation and experiment results found in the slow loading conditions , due to the small load system , the simulation and experiment results are basically the same .Under the loading conditions of periodic excitation , in stroke is relatively large, due to the influence of pressure and piston rod stirs , oil liquid will be partly dissolved gas , which will lead to decline in the o-verall modulus of elasticity of oil and the influence on the output more obvious , at the same time the discharge coefficient is modified , the oil gas suspension nonlinear output characteristic model is obtained after amended .Comparative analysis verified the accuracy of the model , which provides the reference for the further research .