汽车侧风稳定性的仿真与评价*

doi:10.19562/j.chinasae.qcgc.2019.011.009

摘要/Abstract

摘要： 本文旨在对汽车高速行驶时遇到突发或者持续的侧风导致车辆轨迹跑偏而引发的汽车行驶稳定性问题进行研究。首先采用CFD仿真计算侧风条件下汽车的气动特性并与风洞试验结果进行对比。接着将CFD仿真得到的气动六分力加载到动力学模型中,预测侧风条件下汽车的横摆角速度和侧偏位移,最后进行实车道路试验,采用主观评价方法比较侧风下汽车稳定性的优劣。结果表明,车型A和车型B在车速100 km/h和侧风速度80 km/h的工况下,最大横摆角速度和受侧风0.5 s侧偏位移仿真结果分别为2.69°/s,265 mm和3.79°/s,374 mm,两个车型的主观驾评结果分别为“良好”和“略好”。最终建立了评价标准,以便在新车型的详细设计阶段指导侧风稳定性能的开发。

关键词: 车辆工程, 侧风稳定性, Star ccm+/ADAMS联合仿真, 主观评价

Abstract: This paper aims to study the driving stability issue of vehicle caused by trajectory deviation due to the action of sudden or sustained sidewind on high-speed driving vehicle. Firstly, the aerodynamic characteristics of the vehicle under crosswind conditions are obtained by CFD simulation and compared with the results of wind tunnel test. Then, the six aerodynamic component forces obtained by CFD simulation are loaded on the vehicle dynamics model to predict the yaw rate and lateral deviated displacement of vehicle under crosswind conditions. Finally, a real vehicle road test is conducted to compare the stability of two vehicles subjected to the same pattern of crosswind by means of subjective evaluation. The results show that the simulated maximum yaw rate and lateral deviated displacement of vehicle A and vehicle B with a driving speed of 100 km/h and after 0.5 s action of crosswind with a windspeed of 80 km/h are 2.69°/s, 265 mm and 3.79°/s, 374 mm respectively, and their subjective evaluation results are “good” and “relatively good” respectively. Finally, an evaluation criterion is established to provide a guidance for crosswind stability development at the detailed design stage of new model program.

Key words: vehicle engineering, crosswind stability, Star ccm+/ADAMS joint simulation, subjective evaluation

袁侠义, 陈林, 黎帅, 王文源. 汽车侧风稳定性的仿真与评价^*[J]. 汽车工程, 2019, 41(11): 1286-1293.

Yuan Xiayi, Chen Lin, Li Shuai, Wang Wenyuan. Simulation and Evaluation on the Crosswind Stability of Vehicles[J]. Automotive Engineering, 2019, 41(11): 1286-1293.

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汽车侧风稳定性的仿真与评价^*

Simulation and Evaluation on the Crosswind Stability of Vehicles

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