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车速变化对车辆平顺性的影响

Keywords: 汽车工程,平顺性,车速变化,路面输入,频率,时变性

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Abstract:

为研究车速变化对车辆平顺性的影响,建立了考虑车速变化时纵向惯性力影响与白噪声频率时变的路面随机输入1/2车悬架动力学模型。其中,白噪声频率时变的路面输入模型是利用Matlab/Simulink软件的LookupTable模块,针对实时的车辆行驶距离对空间路面随机激励模型查表来获得。数值仿真结果表明车速变化对轮胎动变形、簧载质量加速度及车身俯仰角加速度指标基本没有影响,但使悬架动挠度指标明显变差,且车速变化越剧烈及悬架刚度越小,上述现象越明显。采用减小车辆质心至0.8倍与增大悬架刚度至1.1倍的改进时,牺牲簧载质量加速度指标6.96%和车身俯仰角加速度指标0.89%,可使前后悬架动挠度指标分别得到20%与17.6%的明显改善。

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