基于多刚体动力学的主动转向系统建模与仿真

首先对前轮主动转向系统结构形式进行分析和简化,确定了双行星齿轮机构的拓扑关系;其次,基于多体动力学仿真软件ADAMS完成了主动转向系统建模和运动学仿真,并建立带主动转向子系统的整车模型;接着,讨论了转向系变传动比控制原理,研究了传动比随车速和转角变化的关系;最后,对传统转向汽车和实施主动转向汽车的操纵稳定性进行了对比分析。结果表明,主动转向系统可提高汽车的操纵稳定性。所建立的主动转向系统多刚体模型为深入研究主动转向控制提供了依据。

Modeling and simulation of active front seering system based on multi-body dynamics

It first analyzes a simplified model of the steering system based on the structure of the active front steering (AFS)system,and defines the topology of double planetary gear mechanism.Secondly,the dynamics modeling and kinematic simulation of AFS are realized based on ADAMS,and then a multi-body dynamics model of active front steering vehicle is built.Thirdly,the control principle of ideal variable steering ratio is discussed and the relationship of steering ratio with the change of vehicle velocity and steering angle of steering wheel is obtained.Finally,the handing stabilities of traditional steering vehicle and active front steering are compared.The simulation results show that the active front steering system can improve the vehicle stability.And the multi-body dynamics model built provides some references for the deep research of active front steering system controlling.