菱形新概念车转向性能分析

Analysis of Steering Dynamics of Rhombic New Concept Car

采用线性三轮模型分析了菱形新概念车的转向性能,并推导出转向稳定性因子和横摆角速度增益传递函数.通过8自由度非线性模型的仿真,分析了菱形车的阶跃转向响应特性.仿真结果表明,菱形车在高、低速时具有快速、稳定的转向响应特性.与相关统计数据对比分析表明,采用菱形方式布置车轮除了在低速时具有灵活的转向特性外,高速时具有与传统车轮布置方式相当的动态转向响应特性.

A rhombic new concept car is characterized with a rhombic configuration of 4 wheels, which has the advantage of avoiding forward collision, excellent mobility, and low wind resistive factor over traditional cars. A linear 2 DOF vehicle model with three wheels was firstly used to analyze the steering dynamics of the rhombic new concept car, and the steering stability factor and yaw rate gain transform function were deduced. Furthermore, for more accurate simulation, a nonlinear 8 DOF vehicle model was used to analyze the step steering response of the rhombic car. Simulation results prove the feasibility of rhombic configuration of wheels because its steering dynamics is comparable to that of vehicles with traditional configuration of wheels.