履带起重机变幅拉板载荷的非线性分析

发布时间：2018-04-05 09:11

本文选题：履带起重机　切入点：悬链线　出处：《大连理工大学》2012年硕士论文

【摘要】：履带起重机在国民经济各个领域中应用广泛,是一种流动式起重设备。目前我国的基础建设如火如茶,吊装行业发展迅速,对履带起重机的需求量逐渐增大,对其性能的要求也越来越高。变幅拉板作为履带起重机的重要承载件之一,其拉板载荷的大小对于整个履带起重机的设计以及局部的结构设计都非常重要。在起臂过程中,变幅拉板成悬链线现象,带有一定的柔性,具有非线性特性,其载荷的解析解计算困难,因此对于拉板张力的计算,往往采用估算的线性计算方法求解。本文通过仿真分析和探索,得出一种拉板张力的准确计算方法,这在设计初期有利于其它机构的设计。本课题是源于大连理工大学机械工程学院与徐工集团合作研发的1000t履带起重机实际项目,以此为背景,对该吨位的履带起重机变幅拉板安装拉直过程进行动态特性的仿真,研究其载荷的计算方法和变化规律。 (1)分析了履带起重机塔式副臂系统的组成,以及不同形式的塔式副臂系统,对本文研究的1000t履带起重机变幅拉板进行了介绍和计算。 (2)通过Pro/E、ADAMS软件完成了履带起重机虚拟样机的建模和仿真,并在不同主臂长度下不同拉板组合长度下完成了多种工况仿真,验证了虚拟样机的正确性和可行性。 (3)借用非线性计算方法——悬链线理论,将其用于变幅拉板的载荷计算,通过MATLAB软件编程实现了该方法的求解过程。然后通过ADAMS仿真验证该非线性求解方法的正确性,在误差允许范围内此方法可用于拉板载荷的计算方法。总之,本文借助悬链线理论确定了拉板载荷的计算方法,并建立了履带起重机虚拟样机的仿真模型,将仿真结果和非线性求解结果做了对比,得出了计算拉板载荷的方法。该方法为快速、准确的计算拉板载荷提供了一种方法和途径,具有可应用性。
[Abstract]:Crawler crane is widely used in various fields of national economy and is a kind of mobile lifting equipment.At present, the basic construction of our country is as hot as tea, the hoisting industry is developing rapidly, the demand for crawler cranes is increasing gradually, and the demand for its performance is becoming higher and higher.As one of the important load-bearing parts of crawler crane, the size of the load is very important for the design of the whole crawler crane as well as the local structure design.In the process of arm lifting, the catenary phenomenon of the variable amplitude drawing plate has certain flexibility and nonlinear characteristics, and the analytical solution of the load is difficult to calculate. Therefore, the linear calculation method is often used to calculate the tension of the tension plate.Through simulation analysis and exploration, an accurate calculation method of tension of drawing plate is obtained, which is beneficial to the design of other mechanisms at the beginning of design.This subject is originated from the actual project of 1000t crawler crane developed jointly by the mechanical engineering school of Dalian University of Technology and Xugong Group. On this background, the dynamic characteristics of the installation and straightening process of this tonnage crawler crane's luffing plate are simulated.The calculation method and variation law of load are studied.In this paper, the composition of the tower jib system of crawler crane and the different types of tower jib system are analyzed, and the variable amplitude drawing plate of 1000t crawler crane studied in this paper is introduced and calculated.(2) the modeling and simulation of virtual prototype of crawler crane is completed by means of Pro / E / Adams software, and the simulation of various working conditions under different main arm length and different drawing plate combination length is completed, which verifies the correctness and feasibility of the virtual prototype.3) the catenary theory, a nonlinear calculation method, is used to calculate the load of the variable amplitude tension plate. The solution process of the method is realized by programming with MATLAB software.Then, the correctness of the nonlinear solution method is verified by ADAMS simulation. The method can be used to calculate the load of pulling plate within the range of error.In a word, the method of calculating the load of pulling plate is determined by the catenary theory, and the simulation model of virtual prototype of crawler crane is established. The simulation result is compared with the result of nonlinear solution, and the method of calculating the load of pulling plate is obtained.This method provides a method and approach for calculating the load of pulling plate quickly and accurately, and it is applicable.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH213.7

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