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利用有限元方法以车路耦合系统作为研究对象,开展路面不平整度影响下的车路耦合非线性数值模拟研究,建立了考虑路面不平整度因素的车路耦合非线性数值模型,包括车辆系统、道路系统、车辆与道路的接触3大部分,并模拟车辆行驶和轮胎的跳起等。在非线性模型计算过程中,设定车辆模型在道路表面以某一设定速度匀速运动,并利用道路不平整度频谱进行Fourier逆变换得到时域模拟的路面不平整度数值,以研究路面不平整度激励下车路耦合振动。研究所得主要结论:(1)在随机性路面不平整度影响下,通过对车路耦合非线性动力模型的计算结果数值以及动力模型所反映振动趋势的验证,得出该模型能较好地反映车路耦合作为一个大系统的振动情况,计算结果可信,具有较高的工程应用价值。(2)路面不平整度越差路面产生的振动位移也越大,算例显示同样条件下C级路面下的最大位移量是A级路面的1.31倍,但路面振动频率受不平整度的影响不明显。
By means of finite element method, the vehicle-road coupling system is taken as the research object to study the vehicle-road coupling nonlinear numerical simulation under the influence of road roughness. The vehicle-road coupling nonlinear numerical model considering the road roughness is established. , Road system, vehicle and road contact 3 most, and simulate the vehicle driving and tire jump and so on. In the process of nonlinear model calculation, the vehicle model is set to move at a uniform speed on the road surface at a constant speed, and the road roughness is calculated by Fourier inverse transform of the road roughness spectrum to study the pavement irregularity Smoothness coupled with driving and driving vibration. The main conclusions of the study are as follows: (1) Based on the randomness of the unevenness of the road surface, the numerical results of the coupled nonlinear dynamic model of the vehicle and the vibration trend reflected in the dynamic model are validated, Vehicle-road coupling as a large system of vibration, the calculation results credible, with high engineering value. (2) The worse the unevenness of pavement, the greater the displacement of the pavement. The calculated results show that the maximum displacement under Class C pavement is 1.31 times that of Class A under the same conditions, but the vibration frequency of the pavement is affected by the unevenness Not obvious.