基于某汽车驱动桥壳预应力模态灵敏度的优化设计  

Optimization design of modal sensitivity of a vehicle drive axle shell with prestressing force

作　　者：张军[1] ZHANG Jun(Department of Mechanical and Electrical Engineering,Jiangyin Polytechnic College,Jiangyin 214405,China)

机构地区：[1]江阴职业技术学院机电工程系,江苏江阴214405

出　　处：《机电工程》2020年第8期951-956,共6页Journal of Mechanical & Electrical Engineering

基　　金：江苏省社科应用研究精品工程课题(19SYC-172)。

摘　　要：针对货车驱动桥壳低阶模态频率过高的问题,以某货车驱动桥壳为研究对象,以桥壳主要关键尺寸为设计变量,对驱动桥壳做了预应力模态分析,获得了结构的前六阶固有频率和振型。通过灵敏度分析方法获得了桥壳各设计变量对低阶模态频率的影响规律,基于灵敏度合理选择设计变量,以提高模态低阶频率为目标,整体结构质量不大于65 kg为约束条件,对桥壳做了优化分析,优化后模态低阶频率提高了约10 Hz;再次对优化后的模型做了强度与刚度分析校核;最后,利用台架对驱动桥壳做了垂直弯曲强度和弯曲刚度试验。研究结果表明:可通过设计变量对模态灵敏度的影响进行分析,来指导设计变量取值,从而提高驱动桥壳的低阶模态频率;经试验验证,试验结果与分析结果一致。Aiming at the problem of the vehicle axle shell lower order modal frequency too high,the truck drive axle housing was studied.The key dimensions of the axle housing as design variables were considered,the modal with prestressing force analysis was carried out,and the first six natural frequencies and vibration modes of the structure were obtained.The influence of the design variables of the axle shell on the lower order modal frequency was obtained by the sensitivity analysis method.The design variables were chosen based on sensitivity analysis,then the lower order modal frequency was improved,the overall structural mass constraint condition was considered as not more than 65 kg,then the structure of the axle housing was optimized.The optimize result was shown that the lower order modal frequency was increased 10 Hz,while the mass of the axle housing was not higher than the upper limit.Then the strength and stiffness analysis of the optimized model was analyzed.Finally,the vertical bending strength and bending stiffness of the drive axle housing were tested by the testbench.The results indicate that design variables are chosen according to the analysis of design variables on modal sensitivity,then the lower order modal frequency of the drive axle housing can be improved.The test result is consistent with the analysis results after verified by testing.

关 键 词：驱动桥壳 模态灵敏度 频率 优化设计 

分 类 号：TH133[机械工程—机械制造及自动化] U463[机械工程—车辆工程]