Research On Structural Optimization Design Of Crane Girder Based On ANSYS

With the rapid development of the modern science and technology, the enlargement of the industrial production and the continuous raising of the automation level, the crane is used more and more widely. It plays the more and more important role in industry. Presently, it is a domestic problem that the internal bridge crane's metal structure is bigger in size and the material is wasted. It is more necessary that the key part pf the bridge crane—girder is analyzed and optimized in structure.This thesis chooses the box girder of the crane as the research object and builds the mathematical model of the gird structural optimization design by combining the finite element method with the optimization design method in modern design method. Combining the structure feature with the loading feature, the reasonable girder finite element model is established in the FEA software ANSYS and the girder structural analysis are carried out. Using the ANSYS application program development language (APDL), the structural optimization codes of the girder are programmed and the gird structural optimization design is finished. The optimal results are gotten on the fulfillment of the stiffness and the strength. The girder weight is decreased and the manufacture cost is reduced.Linked up with the engineering practice, the bridge crane system which is composed of the box girder, the trolley, the steel rope pulley block and the hoisting load is analyzed comprehensively. The finite element model of the full equipment is set up in ANSYS. The system modes of the bridge crane are calculated when its full load trolley is in the middle of the span and the extended length of the steel rope pulley block is equal to the elevating altitude. In addition, the impacts on the natural frequency of bridge crane are discussed on the parameter changes of the trolley position, the lifting load, the steel wire length, etc.The thesis research has the certain directing significance and the higher reference for the design and improvement of the bridge crane.