考虑气动升力激励的汽车振动响应分析

为研究气动升力激励对汽车悬架性能的影响,在Simulink建立滤波白噪声路面输入模型和气动升力激励模型。在不同车速下,分别对考虑气动升力激励和不考虑气动升力激励的振动模型进行仿真,对比分析两种情况下的车辆悬架系统评价指标。结果表明:考虑气动升力激励的车身加速度和不考虑气动升力激励时的差异很小;低速时,气动升力激励引起的悬架行程差异较小,高速时,气动升力激励会明显增大悬架动行程;低速时,气动升力激励引起的轮胎动载荷差异不明显,高速时,气动升力激励会使得轮胎动载荷略微增大。

Vibration response analysis of vehicle considering aerodynamic lift

In order to study the influence of aerodynamic lift on the performance of vehicle suspension, a filtered white noise road surface input model and a two-degree-of-freedom vibration model of the vehicle were established in Simulink. At different speeds, the vibration models considering aerodynamic lift and without aerodynamic lift were simulated separately, and the evaluation indexes of vehicle acceleration, suspension travel and tire dynamic load were obtained under two conditions. The results show that there is little difference in body acceleration caused by aerodynamic lift excitation; at low speed, the difference between aerodynamic lift excitation and suspension dynamic load is small; at high speed, aerodynamic lift excitation will significantly increase the suspension travel and tire dynamic load.