基于六分力仪提取载荷谱的某乘用车副车架疲劳分析

Fatigue Analysis of a Sub-frame of a Passenger Car Based on Six-axis Wheel Load

以某乘用车前副车架为研究对象,在定远试验场用六分力仪提取该乘用车4个轮心的载荷谱,在ADAMS中建立副车架与悬架的刚柔耦合多体动力学模型,将基于六分力仪提取的轮心载荷谱,导入到该多体动力学模型中求取副车架结合部位的载荷谱,在HyperMesh软件中对副车架进行单位载荷下的静力分析,最终在疲劳仿真软件n Code中对其进行疲劳仿真分析。通过台架试验验证上述疲劳仿真分析结果,对副车架进行结构上优化,其疲劳开裂问题得到解决。

Taking the front subframe of a passenger car as the research object, the load spectrum of the four wheel hubs is ex- tracted by six-axis wheel force transducer in Dingyuan test field; Rigid-flexible coupled multi-body dynamic model of subframe and suspension is built in ADAMS and the load spectrum of the joint part of the subframe is obtained by muhibody dynamics anal- ysis based on the load spectrum of the wheel hub; The subframe is subjected to static analysis under the unit load in HyperMesh; Finally, fatigue simulation is carried out in nCode. The result of fatigue simulation is verified by bench test, the subframe is struc- turally optimized and the problem of subframe fatigue cracking is solved.