裂纹扩展对结构动态特性影响的数值仿真与实验研究  

Numerical Simulation and Experimental Study on the Effect of the Crack Extending to the Structure's Dynamical Properties

作　　者：李振平[1] 刘均[2] 闻邦椿[1] 王铁光[2] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004 [2]东北大学理学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2001年第5期520-523,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助重大项目 ( 19990 5 10 )

摘　　要：以某钢铁公司钢包回转台大臂的疲劳裂纹扩展为背景 ,用数值仿真与几何相似模型实验相结合的方法对钢包回转台大臂的动态特性进行了研究 ,旨在根据结构动态特性的变化对结构的故障状况进行预测 ,通过数值仿真建立结构动态特性变化随结构裂纹扩展之间的数值关系·本方法既可简化研究过程 ,又可获得较好效果·研究结果表明钢包回转台大臂的各阶固有频率都随裂纹的扩展而减小 。The numerical simulation and model experiment were used to study the dynamical properties of the large arm on the steel package rotaing station. This may be used to forecast the fault state of the arm according to its structure dynamic characterstics. The relationship between the structure dynamic characteristics variation and the crack extension was established through numerical simulation. This method effectively simplifies the process of the study. The natural frequency of the large arm on the steel package rotating station minishes with the crack extending and it is not sensitive to little crack.

关 键 词：故障诊断 疲劳裂纹 动态特性 几何相似模型 数值仿真 固有频率 裂纹扩展 钢包回转台 大臂 

分 类 号：TF341.1[冶金工程—冶金机械及自动化] TH113.1[机械工程—机械设计及理论]