拖曳臂式独立悬架的运动学仿真分析与优化

Kinematic Simulation Analysis and Optimization of Double-Wishbone Independent Suspension

车辆在运动过程中,悬架定位参数变化的范围过大会加剧车轮的磨损,影响悬架的运动学特性,从而导致车辆的操纵稳定性降低。本文以某款SUV轿车为研究对象,采用多体动力学软件LMSVirtual.Lab Motion建立样车的双叉臂式独立悬架的虚拟样机模型,并在两轮平行跳动工况下对其进行运动学仿真,通过对硬点坐标参数进行灵敏度分析的方法,确定对外倾角影响较大的因素,并基于运动学仿真结果和灵敏度分析结果在LMSVirtual.Lab Optimization模块下进行多变量单目标优化设计。优化结果表明,外倾角的变动量显著减小,悬架的运动性能得到了一定的改善,提高了车辆的操纵稳定性。

For vehicle in motion, the largerangeof the positioning parameters on suspension, will aggravate the wheel wear and influence the kinematics of the suspension, which results in the decrease of vehicle steering stability. In this article, with a certain SUV car as the research object,using multibody dynamics softwareLMSVirtual. Lab Motion, we built the virtual prototype model of thesuv^s rear double-wishbone independent suspension, and simulated under the situation of parallel wheel travel. The important influen- cing factors of camber are found out through the sensitivity analysis of the hard points. Moreover, based on the results of simulation and sensitivity analysis, we executed multi variables and single objective opti- mization design in the LMSVirtual. Lab optimization module. The optimization result shows that the varia- tion of camber decreased, the motion performance of suspension is improved, and this also improves the whole vehicle handle stability.