考虑悬架柔性的刚柔耦合汽车平顺性研究

Rigid-Flexible Coupling Study on Ride Comfort of Car with Flexible Suspension

目前对车辆平顺性的研究一般采用多刚体动力学的方法,而没有考虑悬架柔性体对其的影响,致使仿真值和实际值存在一定差别。为了提高模型的仿真精度,基于多体动力学理论,有限元及模态综合法建立了计及前悬架横向稳定杆,下摆臂和后悬架扭转梁柔性的刚柔耦合整车模型。建立B级随机路面模型,对整车进行随机路面平顺性仿真计算。研究结果表明:与多刚体模型相比,刚柔耦合作用使座椅加权加速度均方根值减小,刚柔耦合模型之间的差异随车速提高,说明在研究整车平顺性时,建立刚柔耦合悬架模型是有必要的。

Nowadays ,most researches on vehicle ride comfort are only based on the multi-rigid body dynamics method, but not cortsidering the affection of the flexible suspension components. These lead to the result being some differences with the actual？value. In order to improve the simulation precision of the model, based on multi-body system dynamics, combining the finite element and modal synthesis methods, a rigid-flexible coupling vehicle model including the flexibility of lower arms, stabilizer bar and torsion beam is established. The B-level test road is established. The simulation on the ride comfort is carried out. The research result shows the root-mean-square value of seat acceleration reduces compared with rigid model. The research result also shows that the differences between rigid body model and rigid-flexible coupling model rise with velocity. It＇s necessary to establish the rigid-flexible coupling suspension whole when study the ride comfort.