摘要
赛车在弯道行驶时常常需要减速入弯并加速出弯.针对赛车的此特点,以汽车二自由度简化模型为基础,通过对比赛中车载信息系统所记录的加速度数据的分析,计入了纵向轴荷转移对轮胎侧偏刚度的影响,得到了方程式赛车入弯时和出弯时横摆角速度与前轮转角的传递函数.角阶跃输入仿真结果表明:赛车在入弯时为转向不足,出弯时为转向过度.在此基础上,分别对轴距及转动惯量对赛车操纵特性的影响进行了分析.分析结果表明:轴距的改变对赛车入弯和出弯时的转向特性有较大影响,适当的减小转动惯量可以较大程度提高出弯时赛车的响应速度.
According to the characteristic of which a racing car often needs to decelerate into the corners and to accelerate out of them, and on the basis of a simplified 2-DOF model, the acceleration data in the competition are analyzed from the data logger of the vehicle information system. Taking consideration to the effect of the longitudinal axle load transfer on tire cornering stiffness, a transfer function of the car between yaw velocity and front wheel angle was obtained when running on the corners. The simulation results show that, under a step input, the car running into a curve possesses an under-steer characteristic but it presents an over-steer feature when traveling out of a bent route. The effect of its wheelbase and moment of inertia on the car handling was studied respectively. The results indicate that the change of wheelbase has a greater influence on steering characteristics, and that the appropriate reduction in moment of inertia can greatly improve the response speed of the car in a bend.
出处
《车辆与动力技术》
2012年第2期13-17,共5页
Vehicle & Power Technology
关键词
方程式赛车
转向特性
轴荷转移
主要结构参数
Formula car
Steering characteristics
Axle load transfer
Main structure parameters
