起重机臂架简化建模有限元非线性分析研究

发布时间：2019-03-19 12:46

【摘要】：臂架系统作为全地面起重机上车部分的主要承载部件,其设计制造水平很大程度上决定全地面起重机的使用性能。臂架结构一般具有较大的柔度,作业时在自重与起重量的共同作用下,产生较大的几何非线性变形,严重影响了臂架结构的工作性能。为此本文结合传统结构设计方法的快速性和有限元设计方法的精确性的优点,提出了一种全地面起重机臂架结构简化建模的方法,为全地面起重机臂架系统快速设计提供一种可靠的建模方法。本文提出的全地面起重机臂架结构简化建模方法是通过对桁架臂架结构的截面面积和惯性矩进行等效处理,简化成一种等效的实腹式结构进行建模分析。在截面惯性矩的等效过程中,需要考虑桁架臂架结构的弦杆和腹杆等所有因素的影响,并对臂架结构中的铰点位置与连接方式进行合理的处理,建立全地面起重机臂架结构的有限元简化模型。本文主要研究内容如下:(1)根据全地面起重机臂架系统的结构特征和受载情况,对全地面起重机臂架系统进行有限元建模,并进行强度分析、屈曲分析与几何非线性分析。(2)由于全地面起重机臂架工况多,有限元分析建模困难等问题,本文提出一种主臂结构和副臂结构的简化建模方法,同时与采用自然建模方法建立臂架结构的有限元模型进行对比分析,验证本文提出的臂架结构简化建模方法的可行性。(3)分别对等截面臂架结构与变截面臂架结构的等效截面惯性矩进行计算,并对比本文推导的解析法与能量法的计算结果,发现本文采用的等效截面惯性矩的方法更加精确。
[Abstract]:Jib system is the main load-bearing part of all-ground crane. The design and manufacture level of jib system determines the performance of all-ground crane to a great extent. Generally, the jib structure has greater flexibility. Under the joint action of the dead weight and the lifting weight, the large geometric nonlinear deformation is produced, which seriously affects the performance of the jib structure. Based on the advantages of the traditional structural design method and the accuracy of the finite element design method, a simplified modeling method for the jib structure of all-ground crane is proposed in this paper. It provides a reliable modeling method for the rapid design of all-ground crane jib system. The simplified modeling method of all-ground crane jib structure proposed in this paper is based on the equivalent treatment of the cross-section area and moment of inertia of the truss jib structure, which is simplified to an equivalent real-abdominal structure for modeling and analysis. In the equivalent process of cross-section moment of inertia, the influence of all factors such as chord and web of truss boom structure should be considered, and the hinge point position and connection mode of boom structure should be dealt with reasonably. The simplified finite element model of all-ground crane jib structure is established. The main contents of this paper are as follows: (1) according to the structural characteristics and loading conditions of all-ground crane jib system, the finite element modeling and strength analysis of all-ground crane jib system are carried out. Buckling analysis and geometric nonlinear analysis. (2) the simplified modeling method of the main arm structure and the auxiliary arm structure is presented in this paper because of the many working conditions of the crane jib and the difficulty in modeling the finite element analysis. At the same time, it is compared with the finite element model of jib structure established by natural modeling method. Verify the feasibility of the simplified modeling method proposed in this paper. (3) calculate the equivalent cross-section moment of inertia of the equivalent section boom structure and the variable cross-section arm structure respectively, and compare the results of the analytical method and the energy method derived in this paper. It is found that the method of equivalent cross-section moment of inertia adopted in this paper is more accurate.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH21

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