扭力梁悬架静动态性能分析与轻量化设计

Static and Dynamic Performance Analysis and Lightweight Design for Torsion Beam Suspension

为了校核某扭力梁悬架的静动态性能是否符合设计要求,基于扭力梁的有限元模型对它进行动态特性分析,其前4阶固有频率均处于发动机工作频率范围之外,满足动态性能要求,与此同时进行自由模态试验,测试值与仿真值几乎一致。然后建立后悬架动力学模型,获取扭力梁在极限工况下的载荷,并对它进行静态强度分析,分析结果表明其应力水平均低于材料屈服极限,满足设计要求。再基于集成平台对扭力梁进行轻量化设计,分析结果表明优化之后其静动态性能均符合设计要求,并且成功减重9.3%,整体优化效果比较明显。最后对扭力梁进行台架试验和道路试验,试验结果表明它未发生异响和开裂,因此整个分析方法具有较高的可靠度。

To verify whether the static and dynamic performance of the torsion beam suspension met the design requirements,the torsion beam dynamic performance analyzed was carried based on its finite element model.The analysis results show that its four natural frequencies are outside of engine working frequency range,so it can meet dynamic performance requirements.The free modal test for the torsion beam was made.The test results show that the test values are basically the same as the simulation values.The load of the torsion beam under ultimate working conditions were extracted based on rear suspension dynamic model,and its static strength was analyzed.The analysis results show that its stresses are lower than the material yield limit,so it can meet the design requirements.The torsion beam was lightweight designed by adopting integration platform.The analysis results show that its static and dynamic performance can meet the design requirements after optimization,and its weight is successfully reduced by 9.3%,so the overall optimization effect is obvious.Lastly,the torsion beam was bench tested and road tested.The test results show that abnormal noise and cracking don t occurred,so it has high reliability.