基于随机振动的尿素箱支架疲劳仿真分析  

Fatigue Simulation Analysis of Urea Tank Bracket Based on Random Vibration

作　　者：曾超 付春雨 王剑雄 刘宏杰 张晓辉 Zeng Chao;Fu Chunyu;Wang Jianxiong;Liu Hongjie;Zhang Xiaohui(State Key Laboratory of Reliability of Internal Combustion Engines,Weifang City,Shandong Province 261000,China;Weichai Power Co.,Ltd.,Weifang City,Shandong Province 261000,China)

机构地区：[1]内燃机可靠性国家重点实验室,山东省潍坊市261000 [2]潍柴动力股份有限公司,山东省潍坊市261000

出　　处：《农业装备与车辆工程》2022年第8期130-134,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：对某型号卡车车架搭载结构的裂纹、断裂问题展开研究。以尿素箱支架为研究对象,通过随机振动疲劳仿真获得疲劳损伤结果,评估支架的疲劳可靠性;搭建尿素箱支架系统的有限元模型,进行模态与频率响应分析;以试验采集的支架加速度信号转换的功率谱密度(PSD)作为载荷激励,对结构进行疲劳仿真分析,获取尿素箱支架的疲劳损伤结果,该结果的风险位置与市场反馈的支架断裂位置基本吻合,验证了仿真方法的准确性。对风险位置进行结构改进,改进结构的疲劳损伤较原结构损伤明显减小,验证了仿真方法的合理性与有效性,也为后续类似支架的开发设计提供了参考依据。The crack and fracture problems of a truck frame fixed structure are studied.Taking a urea tank bracket as the research object,the fatigue reliability of the bracket is evaluated by the fatigue damage results obtained by the random vibration fatigue simulation method.Firstly,the finite element model of the urea tank bracket was built,and the modal analysis and frequency response analysis were carried out.Taking the power spectral density(PSD)converted from the acceleration signal of the bracket collected in the experiment as the load excitation,the fatigue simulation analysis of the structure was carried out.The fatigue damage results of the urea tank bracket were obtained.The risk position of the simulation results was basically consistent with the bracket fracture position from market feedback,which verifies the accuracy of the simulation method.After structural improvement to the risk location,the fatigue damage results of the improved structure was significantly reduced compared with damage results of the original structure,which verified the rationality and effectiveness of the simulation method,and also provided a reference for the subsequent development and design of similar structures.

关 键 词：尿素箱支架 疲劳损伤 仿真分析 随机振动 频率响应分析 

分 类 号：U469.5[机械工程—车辆工程]