Structurl Property Analysis And Optimization Of Rough Terrain Crane Boom

Rough terrain crane is a kind of engineering crane with high efficiency, flexibility, reliability, and off-road ability. In foreign developed regions, it is standard equipment in construction industry, which has been used widely in economic development, however, in China the research of rough terrain crane is still in the initial stage. The boom system, as the most important supporting and technical component, bears its own weight, lifting by considering the dynamic coefficient, inertial force to the level of the boom cut, horizontal force caused by boom deflection and wind power and so on. Meanwhile the structure of the boom is large and thin, thus once the boom has some problems, it will lead to the fatal damage of the whole rough terrain crane. So the performance of the boom is an important indicator of whole crane. Finite element method can accurately calculate the strength and stiffness of crane structure of rough terrain crane, especially the local stress distribution. It provides the significant help to design a reasonable crane structure, which can not only meet the strength and stiffness requirements, but also give full play to material properties to reduce its own weight.Setting the development and research of Rough Terrain Crane as a background, this dissertation overviews the present situation and the gap of rough terrain crane and its boom between domestic and oversea. Through the comparison and the selection of the crane section, the understanding of its working mechanism and structure, the investigating of the impact on the crane load caused by the type and the way of telescopic institution, it proposes that the combining use of I-DEAS, HyperMesh, ANSYS software to do finite element method on the whole boom, the establishment of finite element model of the whole crane by combining plate elements, solid elements and beam elements. Then, through the static analysis of the most three dangerous working conditions in the boom, it can provide a reference and foundation for the structure design. According to the rule of calculations to guide the experiment and experiment to verify calculations, it tests the strength of the product and verifies the accuracy of finite element analysis. To ensure the stability of boom in all outriggers condition, through linear buckling analysis and nonlinear buckling analysis, it can obtain the critical load of the boom, which provides the basis of the stability for the boom. Based on the static analysis, to design a crane which can play the mechanical properties and get a more reasonable cross-section, it sets the minimum compliance of the crane structure as an aim. Material volume constraints established mathematical model of the crane topology optimization. This picture shows the cross section obtained topology optimization design reference to provide structural optimization program. And based on actual experience, to further optimize the design and obtain the optimal cross-section, it compares and evaluates the performance of the old and the new boom.The research of this dissertation and practice show that through the combining use of three kinds of software to do the finite element analysis on the crane, it greatly improves the efficiency of finite element analysis and at the same time make a topology optimization crane section, and provide practical reference and guidance for the crane design, adaptation and optimization. What more important is the good economic value and practical significance, especially in the development of new product. It can substantially shorten the development time, reduce development costs and improve product design quality.