空气悬架系统关键承载构件动载荷仿真及疲劳寿命计算

Dynamic load simulation and fatigue life calculation of pivotal load carrying structure of air suspension system

为研究某重型载货汽车空气悬架关键承载构件——平衡梁的疲劳寿命特性,首先在ADAMS环境下建立了试验场典型耐久性数字化路面,通过车辆在虚拟试验路面的仿真得到平衡梁薄弱位置在整车行驶状态下的动载荷,应用LMSTecWare软件对疲劳损伤进行了计算,并与实车实验结果进行了对比。结果表明,两者平衡梁薄弱位置疲劳累积损伤分布趋势基本一致,说明此方法可用于汽车零部件的疲劳寿命仿真以及预测汽车关键结构设计初期的疲劳寿命,从而缩短新产品开发周期、降低研发成本。

The fatigue life behavior of the equalizing beam in a heavy-duty truck surface of the test ground was built in th votal toad carrying structure of the air suspension system, was investigated. A typical endurance virtual digital road e ADAMS environment. The dynamic loads of the weak points of the beam under vehicle driving state were obtained with the simulation of the vehicle on the virtual test road. The fatigue damage of the beam was calculated by the software LMSTecWare, and was compared with the experimental results of real vehicle. The results show that the simulated distribution tendency of the cumulative fatigue damage of the beam coincide with the road test result very well. The proposed simulation method is successful to predict the fatigue life in the early stage of vehicle pivotal structure design, being of help to reduce the development period and cost of the new product.