基于双向耦合方法的汽车侧风稳定性研究

Research on vehicle stability under crosswind condition by two-way coupling method

针对传统单向耦合方法对汽车瞬态侧风稳定性预测不足等问题,文章通过分析车身运动与流场的耦合作用,结合空气动力学与系统动力学,提出了一种双向耦合方法。基于考虑驾驶员模型的二自由度整车操稳模型,对某汽车模型进行了伪阶跃瞬态侧风工况条件下的双向耦合数值分析,并与传统的单向耦合数值计算进行了对比分析。对比结果表明:基于双向耦合计算得出的汽车侧向位移和横摆角变化更为显著,驾驶员控制模型有利于提高高速汽车侧风稳定性,双向耦合方法分析汽车侧风稳定性问题更符合实际。

In order to study the vehicle stability under crosswind condition, through the analysis of the coupling effect of body posture to fluid field, a two-way coupling method combined with the aerodynamics and system dynamics was proposed for traditional one-way coupling method did not conform to the practical problem. Based on the 2-DOF full vehicle dynamic simulation model considering the driver model, a numerical analysis of the vehicle model was conducted under the pseudo-jump typical crosswind condition. And the result was compared with that of the one-way coupling method. The calculation results indicate that the vehicle lateral displacement and yaw angle obtained by two-way coupling method are more significant. And the driver model has a positive influence on the study of crosswind stability. The two-way coupling method is more applicable to the crosswind stability analysis.