提出了一种道路模拟试验与CAE相结合的汽车耐久性分析方法.采用道路模拟技术复现实际路面状况,迭代得到的轮胎激励信号,作为CAE动力学分析的边界条件.建立整车刚柔耦合模型,仿真获取关键零件连接点的载荷历程.以某汽车的下摆臂作为实例,采用有限元分析的惯性释放法,求得其应力.据此进一步对其载荷状态做二轴性分析,并选择合适的多轴疲劳损伤模型进行多轴疲劳分析.分析结果与路试结果对比表明,该方法可在设计阶段有效预估汽车关键零部件在非比例载荷作用下的疲劳寿命.%A vehicle durability analysis method combing road simulation test with CAE technique is proposed. Specifically, the real road conditions are reproduced with road simulation technique, and by iteration the tire excitation signals are obtained as boundary conditions for dynamics analysis. A rigid-flexible coupling model for complete vehicle is built and the loading histories at the junctions of key components are obtained by simulation. Taking the lower control arm of a vehicle as example, its stresses are evaluated with the method of inertia relief in finite element analysis. Based on this the biaxiality of its loading is analyzed and a multiaxial fatigue analysis is conducted with an appropriate multiaxial fatigue damage model chosen. The comparison between results of analysis and test indicates that the method proposed can effectively predict the fatigue life of vehicle key components under nonproportional loading at early design stage.
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