Dynamics And Stiffness And Strength Analysis Of The Bridge Crane Based On Simulation

:Crane is a kind of space vehicle. Its main function is to complete the position change of the object. The bridge crane’s bridge structure including main girder, end beam and crab, is the main bearing part of the crane. Its stiffness and strength are important indicators of crane safety performance validation. The bridge structure’s stifness and strength of bridge crane under various typical working conditions were analyzed by finite element method (FEM) software MARC and multi-body dynamic simulation analysis software ADAMS based on the finite element theory and kinetic theory.Firstly the3-D geometric model of the bridge crane’s bridge structure was built by Solidworks software, by using the assembly model scheme and the simplified shell model scheme. The merits of the two modeling scheme were compared. The assembly mode is fit for the finite element analysis and the simplified shell model is fit for the multi-body dynamics analysis.Secondly four kinds of typical working conditions were suggested to be studied in-depth, In accordance to the operating features of bridge crane that often start and brake, the four typical working conditions are:the full loaded crab starts in the middle of main girder, the full loaded crab starts at the end of the main girder, the crab loaded in the middle of main girder and the full loaded crab upload in the middle of main girder. These four typical working conditions were simulated with multi-body dynamics software ADAMS. The maximum loads on the main girder under the four typical working conditions were extracted from multi-body dynamic simulation results as the input loads in FEM simulation to analyze the stiffness and strength of bridge structure. The wire rope was modeled by multiple consecutive small cylinders through bushing force to reflect the flexible connection of the wire rope and stiffness formula. Rope’s damped coefficient was determined by means of trial and error simulation, which helps to simulate the rope’s motion.Finally, the bridge structure’s stifness and strength analysis under four typical working conditions were analyzed by simulation in finite element analysis software MARC, which helps obtain the stress distribution chart and deformation pattern. The finite element analysis simulation of crane structure verifies that the stiffness and strength of crane structure satisfies the requirement of design. The research methods and results supply an effective theoretical support to the safety and stability verification of the crane, meanwhile it also gives a basic analysis to make a lightweight research design of the crane.