气动力对车辆稳态转向特性的影响分析

根据简化的三自由度车辆模型，建立了车辆稳态转向特性的评价指标（稳态横摆角速度增益、侧向速度增益和侧倾角增益）与气动力的关系。分析了侧向气动力、侧倾气动力矩和横摆气动力矩对车辆操纵稳定性的影响。为改善车辆高速行驶稳定性提供了理论依据。

Influence of Aerodynamics on Steadily Turning Performance of a Vehicle

The influence of aerodynamic properties and various steady and transient crosswind gusts, especially lateral wind on vehicle stability can not be neglected when the vehicle runs at high speed. The vehicle will deviate its running path when affected by the high speed airflow, which may result in an unsteady condition, such as side slip, oversteer and so on. The relationship between the steadily turning performance of vehicle(yaw rate gain, lateral velocity gain, and roll angle gain) and aerodynamics was determined based on a simplified model of three degrees of freedom, and the influences of a lateral aerodynamic force and roll and yaw moments on the steadily turning performance of vehicle were analysed, which provided a criterion for improving the stability of a vehicle at high speed.