某微型车前悬架纵倾仿真与优化

Numerical Analysis and Optimization of Minicar Front Suspension Pitching

通过ADAMS/CAR建立前麦弗逊悬架模型和双轮平跳分析,评估某微型车轮跳对其车轮定位参数、悬架刚度及悬架点/抬头量的影响.针对点/抬头量过大的问题,采用D-最优试验设计方法,对下摆臂硬点坐标和弹簧刚度进行灵敏度分析,进而降低点/抬头量,并确保车轮定位参数变化合理.研究表明:该车车轮定位参数和悬架刚度变化趋势合理;下摆臂内侧硬点z向坐标、弹簧刚度对点/抬头量影响较显著;当减小下摆臂前铰z向坐标或增大下摆臂后铰z向坐标和弹簧刚度,点/抬头量明显减小,车轮定位参数仍在允许范围内.

A model of minicar Macpherson suspension was established to evaluate the effect of double wheels parallel travel on the wheel alignment parameters,wheel rate,dive braking and lift acceleration using ADAMS/CAR software.A design of experiment method of D-optimal was employed for the sensitivity analysis of lower control arm hard point and spring stiffness in order to reduce diving and lifting magnitude and ensure reasonable change of wheel alignment.The results revealed that,the car wheel alignment parameters and wheel rate variations are in a reasonable range.Zcoordinates of lower control arm hard point and spring stiffness have significant effects on diving and lifting;zcoordinates of lower control arm rear joint or spring stiffness increases as zcoordinates of lower control arm front joint decrease.However the wheel alignment parameters are still within the designed range.