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在现有的公路路面不平度研究方法的基础上,采用一种数值模拟的方法来得到路面不平度及其功率谱密度数据。充分考虑车辆振动时的固有振动频率和工程车辆行驶的工况后,利用该方法对F级路面进行模拟,将得到的数据应用到ANSYS的随机振动分析模块中。在ANSYS中对车桥结构进行随机振动分析并得到随机振动响应参数,按照Steinberg提出的基于高斯分布的三区间法,结合Miner线性累积损伤理论求得工程车辆前桥结构的理论疲劳寿命。
Based on the existing research methods of road surface roughness, a numerical simulation method is used to get the roughness of road surface and its power spectral density data. Taking full account of the natural vibration frequency of the vehicle and working conditions of the vehicle, this method is used to simulate the F-class road surface. The obtained data is applied to the random vibration analysis module of ANSYS. In the ANSYS, the random vibration analysis of the axle structure is carried out and the random vibration response parameters are obtained. The theoretical fatigue life of the front axle structure of the engineering vehicle is calculated according to Steinberg’s three-interval method based on Gaussian distribution and Miner’s linear cumulative damage theory.