基于和的车辆行驶平顺性和操纵稳定性分析(2)
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【关键词】
【摘要】图4 二/三自由度横向角速度Fig.4 Bicycle/3 DOF lateral acceleration 图5(a)和图5(b)结果说明,滚动运动在车辆动力学响应中起着关键作用,在仿真中,滚动运动会削
图4 二/三自由度横向角速度Fig.4 Bicycle/3 DOF lateral acceleration
图5(a)和图5(b)结果说明,滚动运动在车辆动力学响应中起着关键作用,在仿真中,滚动运动会削弱车辆的过度转向特性[10]。因此,2自由度模型的过度转向特性要比3自由度模型强得多。
图5 二/三自由度模型下的车辆路径Fig.5 Bicycle/3 DOF vehicle path
图6(a)和图6(b)结果说明,滚动运动在车辆侧滑响应中起着关键作用,在此仿真中,滚动运动会削弱车辆侧滑响应。因此,自行车模型的车辆侧滑响应远强于3自由度模型。
图7(a)和图7(b)结果说明,滚动运动在车辆前胎侧滑响应中起着关键作用,在此仿真中,车辆的滚动运动可以增加车辆前胎侧滑响应。因此,3自由度模型的车辆前胎侧滑移响应远强于2自由度模型。
图8(a)和图8(b)结果说明,滚动运动是车辆后胎侧滑响应的关键作用,在此仿真中,车辆的滚动运动会削弱车辆后胎侧滑响应[11]。因此,二自由度模型后胎侧滑移响应远强于3自由度模型。
图6 二/三自由度模型下的侧滑角Fig.6 Bicycle/3 DOF vehicle side slip angle
图7 二/三自由度模型下的前胎侧滑角Fig.7 Bicycle/3 DOF front tire side slip angle
图8 二/三自由度模型下的前胎侧滑角Fig.8 Bicycle/3 DOF rear tire side slip angle
4 结论
在车辆系统动力学中,滚动阻力运动、横摆运动、横向运动共同决定了车辆运动状态。偏航率、横向速度、侧向加速度、车辆过度转向、车辆侧偏角、前后轮胎侧滑角、横摇角、滚转角速度及Wheels camber-by-roll系数和Wheels steer-by-roll是车辆的运动状态的描述量。
EPS功能开发过程中,充分了解了被控对象的动力学特性,更容易合理地根据整车属性匹配补偿功能,实现理想的驾驶平顺性和操纵稳定性目标。
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