发动机支架安装凸台的断裂故障诊断分析  

Malfunction diagnosis analysis of a bracket mounting boss for engines

作　　者：杨万里[1] 杨俊伟 邓晓龙 刘国庆 

机构地区：[1]奇瑞汽车有限公司汽车工程研究院

出　　处：《华中科技大学学报（自然科学版）》2007年第3期123-125,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2005AA501310);安徽省自然科学基金资助项目(050440106);湖北省教育厅重点资助项目(D200513002)

摘　　要：针对发动机发电机支架安装凸台及连接螺栓常出现的断裂失效问题,提出一种仿真分析与实验结合的诊断方法.首先建立了包含发电机和空压机模型的支架有限元模型,并进行了约束模态分析,进而针对缸体局部和电机支架进行了螺栓预紧应力分析.最后,对发电机和空压机进行了动平衡测试.仿真与试验结果表明:发动机运行期间,连接区域松脱可能是造成失效的重要原因.采用该诊断方法解决了失效问题.To solve the rupture problem of mounting boss and bolt at generator bracket of the engine, a method combining computer simulation and experiment is presented. The finite element model of the bracket with the simplified generator and air compressor was constructed and the constrained modal analysis was done. Then, the stress simulation under the bolt pre-load case and the dynamic balance test of the generator has been implemented. The simulation and test results indicated that the slack of the connecting region induced by engine vibration and plastic strain is the main reason of the structural failure. Adopting the method, the failure problem has been solved successfully.

关 键 词：发动机 模态分析 故障诊断 有限元 

分 类 号：U464[机械工程—车辆工程] TK413[交通运输工程—载运工具运用工程]