共用安装点的部件振动疲劳试验研究  

Research on Vibration Fatigue Test of Components with Shared Mounting Points

作　　者：谢凡 武金龙 夏学文 Xie Fan;Wu Jinlong;Xia Xuewen

机构地区：[1]三一汽车制造有限公司商用车试验中心,410100 [2]湖南省新能源商用车工程技术研究中心 [3]三一汽车制造有限公司数字仿真研究院

出　　处：《工程机械》2024年第8期107-111,I0015,共6页Construction Machinery and Equipment

摘　　要：工程车辆行驶工况恶劣,其悬挂件的主要失效模式为振动疲劳,为缩短开发周期,通常采用损伤等效原则利用PSD谱进行台架试验验证。某款工程车辆的尾灯支架与追尾护栏共用螺栓安装于车架尾部,开发过程中两者单体零部件振动试验均通过验证,但整车强化试验时却出现尾灯支架开裂故障。经模态分析,发现两者因共用安装点而存在振动挤压导致开裂,频响分析证实危险截面与故障位置吻合。经改进台架试验方案,随机振动准确复现了尾灯支架的故障部位,从而明确了故障机理。The driving conditions of engineering vehicles are harsh,and the main failure mode of their suspension components is vibration fatigue.To shorten the development cycle,the principle of damage equivalence is usually applied and PSD spectrum is used for bench test verification.The tail light bracket and tailgate of an engineering vehicle are mounted on the rear of the frame with common bolts,and both of the individual component have been verified in the vibration tests during the development process,but the tail light bracket cracked during the overall enhancement test.Through modal analysis,it was found that,the vibration extrusion caused by the shared mounting point between the two led to crack,and the frequency response analysis confirmed that the hazardous section coincided with the fault location.By improving the bench test plan,the random vibration accurately reproduced the fault location of the tail light bracket,thus clarifying the fault mechanism.

关 键 词：共用安装点 模态分析 频响分析 随机振动 疲劳 

分 类 号：TU60[建筑科学—建筑技术科学]