磁流变半主动空气悬架混合天地棚控制策略研究

以磁流变减振器半主动空气悬架为研究对象,基于流体动力学理论建立空气弹簧数学模型,利用试验数据建立磁流变减振器多项式模型。考虑到空气弹簧刚度和磁流变减振器阻尼的非线性,将其以空气弹簧和磁流变减振器非线性力的形式引入到四分之一车辆动力学模型中;以汽车行驶平顺性,轮胎接地性和操纵稳定性的综合性能为控制目标,利用加权系数u引入混合天地棚控制策略,并分析了不同的u值对悬架各性能指标的影响,当u取0.8时,悬架综合性能最好,簧上质量加速度均方根值改善达23.2%,轮胎动载荷均方根值降低17.4%,悬架动行程略有改善。

Research on the Mixed Sky-Hook and Ground Hook Control Strategy based on Magneto-Rheological Semi-Active Air Suspension

This study focuses on semi-active air suspension with magneto-rheological (MR) damper,based on fluid mechanics,air spring model was established,and the MR damper polynomial model was established by using experimental data.Considering the nonlinearity of air spring and MR damper,they were introduced into 1/4 vehicle dynamic model in the form of nonlinear force.By using the weighted coefficient of u,the mixed Sky-Hook and Ground-Hook (SH-GH) control strategy was introduced into semi-active suspension to achieve the comprehensive performance of ride comfort,road holding and handling stability.The effect of u on the various evaluation indexes was analyzed,and when u takes 0.2,the best comprehensive performance can be achieved, the RMS of sprung mass acceleration improved by 30.2%,the RMS of tire dynamic load reduced by 24.4%,and the RMS of suspension dynamic travel improved slightly.