计及风压中心漂移的汽车侧风稳定性研究

运用汽车侧风稳定性理论，对侧向风敏感性试验的4个阶段进行了详细分析，在ADAMS／Car软件平台上建立了侧风环境下仿真所需的整车动力学模型．仿真过程首次计及风压中心的漂移，着重拟合了气动侧力、风压中心位置随时间的变化曲线．将得出的仿真结果与以往把侧风作用期间风压中心的位置视为固定不变的情况进行了比较，结果显示计及风压中心漂移的仿真数据与试验趋于吻合．根据分析结果，提出了几条改善侧风稳定性的措施。

Study on Automobile Cross-Wind Stability in Consideration of Pressure Center's Shift

This paper presents a detailed analysis of the four stages of cross-wind sensitivity tests by means of the theory of automobile cross-wind stability. By using ADAMS/Car software, the vehicle's dynamic model was established. In the simulation analysis, pressure center's shift was taken into account for the first time. The time-history curves of the lateral aerodynamic force and the pressure center's shift were emphasized. Compared with the simulation result with pressure center as invariability, the result in consideration of pressure center's shift was more consistent with the test data. Lastly, this paper presents some measures for the improvement of cross-wind stability according to the analysis results.