基于刚柔耦合动力学的铸造起重机结构疲劳寿命研究  

Research on fatigue life of casting crane structure based on rigid-flexible coupling dynamics

作　　者：陈琳 秦义校[1] 高梁 冯姝锦 王晓珍 Chen Lin;Qin Yixiao;Gao Liang;Feng Shujin;Wang Xiaozhen

机构地区：[1]太原科技大学机械工程学院,太原030024

出　　处：《起重运输机械》2025年第5期29-36,共8页Hoisting and Conveying Machinery

基　　金：山西省重点研发项目(201903D121067);山西省“1331”工程重点学科建设项目(1331KSC)。

摘　　要：针对铸造起重机结构在满载和高频工作循环下容易发生疲劳破坏的问题,文中提出了一种基于刚柔耦合动力学的疲劳寿命分析方法。以现役铸造起重机为主要研究对象,构建了三维模型并进行静力学仿真;为模拟该机主小车的运行过程,对主梁施加移动荷载,确定主梁的最大应力位置点以及此时主小车在移动过程中的位置;对该机的一个完整工作循环进行刚柔耦合动力学仿真,得到其载荷谱;通过仿真求出主梁的疲劳寿命,结果表明了该方法在分析铸造起重机时间应力历程的有效性和疲劳寿命分析的可行性。Given that casting crane structures are highly susceptible to fatigue failure under full-load and high-frequency working cycles,a fatigue life analysis method based on rigid-flexible coupling dynamics was proposed.Taking an inservice casting crane as the research object,a three-dimensional model was constructed and subjected to static simulation.To simulate the operating process of the main trolley,a moving load was applied to the main girder,thereby identifying the maximum stress position of the main girder and the position of the main trolley during movement.A complete working cycle of the crane was simulated using rigid-flexible coupling dynamics.From this simulation,the load spectrum was obtained,and the fatigue life of the main beam was assessed.The results validate the effectiveness of this method in analyzing the time-dependent stress history of the casting crane and demonstrate the feasibility of conducting fatigue life analysis using this approach.

关 键 词：铸造起重机 疲劳寿命 动力学 移动载荷 仿真 

分 类 号：TH218[机械工程—机械制造及自动化]