轿车高速行驶方向盘摆振控制与工程应用

摘要

研究高速行驶方向盘摆振机理，控制策略，识别与测试方法。根据实际工程问题，建立某摆振车辆的多体仿真模型，分析方向盘摆振的影响因素及优化措施。为确定传递路径上各影响因素对摆振的影响程度，开展方向盘摆振对影响因素的灵敏度分析，结果表明前摆臂后衬套刚度、前摆臂前衬套刚度、副车架后衬套刚度是影响摆振的敏感因子。通过DOE正交试验优化系统衬套参数，该车方向盘摆振幅值降低近52%，有效地抑制摆振现象。最后开展实车道路试验，验证仿真分析的准确性。该研究提供一套行之有效的高速方向盘摆振控制方法，并取得良好的工程应用效果。%The steering wheel nibble mechanism of vehicles at high speeds and the corresponding control strategy, identification and measurement methodology were studied. According to the practical engineering problem, a multi-body dynamics model for nibble simulation in a problematic vehicle was established. The influencing factors and the optimization measures for the steering wheel nibble were analyzed. In order to determine the contribution of the influencing factors to the nibble in the transfer paths, the sensitivity of the steering wheel nibble to the influencing factors were investigated. The results show that the rear bushing stiffness and the front bushing stiffness of the front control arm, and the rear bushing stiffness of the sub-frame are the sensitivity factors which influence the steering wheel nibble. Optimizing bushing stiffness parameters through DOE approach, the magnitude of the steering wheel nibble of the problematic vehicle was reduced by 52 %, and the nibble phenomenon was effectively suppressed. Finally, a road test was done for the vehicle and the correctness of the simulation analysis was verified. This study provides an effective approach for controlling steering wheel nibble of vehicles.