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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Lookup Table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。
In order to study the influence of vehicle speed on vehicle ride comfort, a model of 1/2 car suspension with random input of road surface considering the effect of longitudinal inertial force and white noise frequency change was established. Among them, the white noise frequency time-varying road surface input model is the use of Matlab / Simulink software Lookup Table module for real-time vehicle driving distance of the spatial pavement random excitation model look-up table to obtain. Numerical simulation results show that the change of vehicle speed has little effect on the dynamic deformation of the tire, the acceleration of the sprung mass and the acceleration index of the pitch angle of the vehicle. However, the dynamic deflection index of the suspension obviously deteriorates, and the more severe the change of the vehicle speed and the smaller the suspension stiffness, The more obvious the phenomenon. When the vehicle center of mass is reduced to 0.8 times and the suspension stiffness is increased to 1.1 times, the sacrificial sprung mass acceleration index 6.96% and the vehicle body pitch angle acceleration index 0.89% can make the dynamic deflection indexes of front and rear suspensions get respectively 20% Significant improvement with 17.6%.