汽车线性四自由度操纵稳定性分析

Linear Analysis of Handling Stability of Four DOF Automobile

选取红旗系列车型作为研究对象,设定汽车在设定车速下匀速行驶,建立汽车的四自由度动力学模型,采用通用仿真软件Matlab进行仿真建模,并运行仿真模型进行线性分析。通过对方位角(航向角)γ、质心侧偏角β、车身侧倾角、转向盘转角θ等参数的仿真,分析汽车在理想工况下的行驶稳定性,同时分析这些参数对汽车操纵稳定性的影响,为其他实际工况下汽车稳定性的分析提供参考依据。

Taking Hongqi series car model as a research object, setting vehicle speed at constant valve, the paper buih a four degrees of freedom vehicle dynamic model. The simulation model of vehicle was carried out by Matlab, and linear analysis was used in the simulation model. The stability of vehicle travelling was analyzed in ideal working condition through parameter simulation such as angle of position（ heading angle） γ, slip angle of centre of massβ, roll angle of car body φ, steering-wheel angle θ and so on. At same time, the influence of these parameters on handling stability of vehicle was analyzed, and all these can provide a reference for vehicle＇ s handling stability analysis under actual working condition.