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过去对于机械的强度设计,只局限于静态强度设计,将动载荷对机件的损伤影响,以动载系数的形式,转化为静载荷来计算。现在,由于电子计算机和新的计算方法的逐步普及,人们越来越重视机构的动态分析和动强度设计了。本文试图用有限元法的基本思想,讨论起重机工作机构在非稳定运动时期的动态分析及内力时间历程。根据内力时间历程对机构如何进行工作疲劳强度或有限寿命的验算,限于篇幅不予讨论。首先,我们看到,起重机工作机构在工作时,总经历从起动到平稳运动、到制动这样一
In the past, the strength design of the machine was limited to the design of static strength, and the damage of the dynamic load on the machine parts was calculated in the form of dynamic load coefficient and converted into static load. Nowadays, due to the gradual popularization of electronic computers and new calculation methods, people pay more and more attention to the dynamic analysis and strength design of institutions. This article attempts to use the basic idea of finite element method to discuss the dynamic analysis of the working mechanism of cranes in the period of unsteady movement and the time history of internal forces. According to the internal force of the course of time on the organization how to carry out fatigue strength or limited life of the checks, limited to the length will not be discussed. First of all, we see that the crane work organization at work, the total experience from start to smooth movement, to such a brake