履带起重机格构式臂架设计计算及可靠性分析

发布时间：2018-06-29 21:43

本文选题：履带起重机 + 随机有限元　；参考：《太原科技大学》2013年硕士论文

【摘要】：随着国内大型工程项目的快速投建，整体吊装工程越来越普遍，这也直接导致了对吊装起重机的整体起重能力、作业范围和作业高度的要求越来越大，履带起重机得到了快速、高效的发展。格构式臂架作为履带起重机工作时的主要承载构件，决定着整机的起重能力、作业范围和作业高度，其力学性能对整机的安全使用有直接影响，对整机结构起着举足轻重的作用。由于起重机在生产生活中的重要地位，臂架结构的工作可靠性相对于其它结构显得尤为重要。进行臂架可靠性分析可有效的避免其工作时安全事故的发生，提高劳动生产效率。本文以某型履带起重机格构式臂架为对象，首先通过研究分析确定臂架的计算方法并建立了计算模型。根据《GB/T3811—2008起重机设计规范》,确定了臂架载荷情况及载荷组合，采用许用应力法对臂架进行强度、刚度、稳定性计算，并对计算结果进行校核以满足使用要求。其次使用现代设计方法中的有限元方法进行格构式臂架的大变形、非线性问题进行仿真校核；本课题结合实际工况，利用成熟的商业软件Workbench对格构式臂架进行受力几何非线性变形分析。各种外部激励振动对臂架的工作造成很大影响，为了避免因这些激励因素引起工作臂架的共振并进行模态分析和屈曲分析，得出臂架的固有频率与使臂架发生屈曲的临界压应力，对臂架的设计改进提供技术支持。最后在静力分析的基础上采用随机有限元法中的蒙特卡罗法对格构式臂架进行可靠性分析，，得出臂架在固定工况条件下的可靠度。综上所述，本文对履带起重机格构式主臂进行的设计计算、有限元分析以及可靠性分析，是现代设计方法在起重机上的具体应用，对臂架结构工作的安全性和经济性有非常重要的意义，具有一定的工程实际应用价值。
[Abstract]:With the rapid construction of large engineering projects in China, the whole hoisting project is becoming more and more common, which directly leads to the requirements of lifting crane's overall lifting capacity, operation scope and operation height, and the crawler crane is getting faster and faster. Efficient development. As the main bearing member of crawler crane, lattice boom determines the lifting capacity, working range and working height of the whole crane, and its mechanical properties have a direct impact on the safe use of the whole machine. It plays an important role in the whole machine structure. Because of the important position of crane in production and life, the work reliability of boom structure is more important than other structures. The reliability analysis of the boom can effectively avoid the occurrence of safety accidents and improve the efficiency of labor production. In this paper, the lattice jib of a crawler crane is taken as the object. Firstly, the calculation method of the jib is determined through research and analysis, and the calculation model is established. According to "GB / T 3811-2008 Crane Design Code", the load situation and load combination of boom are determined. The strength, stiffness and stability of boom are calculated by allowable stress method, and the calculation results are checked to meet the requirements of application. Secondly, the finite element method of modern design method is used to carry out the large deformation of the lattice boom, and the nonlinear problem is simulated and checked. The geometric nonlinear deformation analysis of lattice boom is carried out by using the mature commercial software Workbench. All kinds of external excitation vibration have great influence on the work of the boom. In order to avoid resonance caused by these excitation factors, modal analysis and buckling analysis are carried out. The natural frequency of the boom and the critical compressive stress of buckling are obtained, which provide technical support for the improvement of the design of the boom. Finally, on the basis of static analysis, Monte Carlo method of stochastic finite element method is used to analyze the reliability of the lattice boom, and the reliability of the boom under fixed working conditions is obtained. To sum up, the design calculation, finite element analysis and reliability analysis of the lattice main arm of crawler crane are the concrete application of modern design method in crane. It is of great significance to the safety and economy of boom structure, and has certain practical application value.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH213.7

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