U Type Gantry Crane Parametric Design And Finite Element Analysis System

The development of modern science, the enlargement of production scaleand the continuous improvement of automation technology, all these lead tothe increasingly important position in the modernized industrial production ofcrane. Since the metal structure of U type gantry crane have giant advantage incarrying capacity and leg space, as a kind of special lifting equipment throughhanding container, U type gantry crane is widely used in harbor and dock andrailway goods yard etc. With the enlargement scale of its use, more and moreproblems have caused in the process of practical application. The traditionaldesign method can produce a large amount of problems in design level or thedesign efficiency. The traditional method of design can not meet modernproduction needs, new design method and powerful tool in crane metalstructure design is desperately need. In order to improve the performance ofthe whole crane, and promote the development of the industry.Therefore, with the purpose of improve the design level of gantry crane. Inthis text, we use the finite element analysis of ANSYS and the developinglanguage of AutoCAD—ObjectARX to develop the gantry crane parametricdesign system, for the metal structure of gantry crane be designed rapid andreliable, makes the function in accuracy and reliability and economy moreprefect. The main research contents of the subject as follows:(1) Using traditional method to design metal structural of50t-30m U typegantry crane, and then coding the whole design process.This means guaranteesparametric design for the same type of gantry crane, avoid the repeatedcalculation.(2) The secondary development of AutoCAD based on ObjectARX. Underthe framework of general program of AutoCAD, we develop the specialcommand of mental structural design and parametric drawing. Successfullydeveloped the embedded software of gantry crane parametric design anddrawing. (3) Using ANSYS parameter design language APDL, to establish the finiteelement analysis program of50t-30m U type gantry crane, automaticimplementation the function of parametric modeling, meshing, imposedboundary foundation and result post-processor. Finite element analysis resultsand theoretical calculation results were similar, it is illustrated that the result offinite element analysis is right. The analysis of stiffener rib on the influence ofthe main girder under various working conditions is in detail, we get theconsistent results with the traditional theory(4) Based on theoretical calculation and finite element analysis before,using the powerful computation ability of ANSYS modal analysis, calculateFirst-order natural frequency and vibration model of gantry crane, to judgewhether the crane meet the requirements of dynamic stiffness.(5) We use the main girder cross section size and thickness as the designvariables, maximum stress and maximum deformation of girder as statevariables, and the lightest weight (smallest) as the objective function,optimization design for main girder structure, To achieve the purpose of createa lightweight structure.In this paper, we use the large finite element analysis software ANSYS forthe tool, by means of APDL(ANSYS secondary development language), inallusion to the defects of traditional crane design, with the purpose of to dosome attempt and exploration in terms of the modern design method of crane.In this paper, we focus on the study of theory and method, if you want toapplied in actual production, we also need further experiments. This paperadopts the advanced design method and I believe that the paper will have acertain enlightenment to crane designers in theory.