Based On The Finite Element Analysis Of Single Girder Crane Optimization DesignSummaryUse ANSYS9.0 analysis single girder crane steel structure of the mechanical characteristics, and combining analysis results luo practical experience puts forward corresponding structure optimization scheme, the correctness and rationality verified, and optimal design for the similar product reference.Key word: bridge cranes; Steel structure; Optimization design; FEMIt is used widely in machine manufacture, metallurgy, steel, wharf bridge crane with China accounts for about 40% of the crane. The original crane design method for more traditional design methods, design the efficiency is low, the design crane safety factor is big, consume more than raw material, structure is not rational. To be on the steel structure optimization design.Usually the optimization design is using mathematical programming method, mechanical engineering design problems will be transformed by correspondence and target constraint conditions description limit optimization problem. The method for solving the problem of the optimization of the typical can get better optimization results, but for engineering practice often appear multiple targets, the constraint conditions optimization problem there is difficult to establish mathematical model and calculation complex, difficult to application.In view of this, this paper using finite element analysis software for possible structure design scheme of rapid virtual test, and through the analysis of the results of the tests of virtual FEM, and makes the corresponding structure optimization. With LX type single girder crane Lord LiangGang structure as an example, the use of ANSYS simulation in the worst condition of the stress distribution and deformation condition, the author puts forward the optimal scheme and test.1. The LX type 5 t electric suspension single girder crane steel structure characteristicsLX type 5 t electric suspension single girder crane girder and two by the beam, the electric hoist, during operation mechanism, and electric equipment and other major parts. Wheel group hangs upside down in the workshop the H of rail operation. The central beam I32a girder by paper box beam and welded; Both ends of I32a range by the cantilever and channel steel 28 a welded; the two root channel steel beam by 18 and welded steel box girder, through the beam two lug realization and the connection of the girders, as shown in figure 1 .2. Finite element modeling and analysis method2.1 units of the selection and grid partitionLX type 5 t electric suspension single girder crane steel in the range, channel steel box girder and the main dimensions are of its thickness 10 times above, the selected shell element (shall 63) in the bridge cranes finite element analysis 1. In addition, choose shell element model optimization for modification.2.2 determined the bad working environmentThe related theory shows that: the small car in the midspan and brake, cart rail connection and brake ways; The car is located in limit position of the cantilever beam and brake, cart rail connection and ways for the worst deflection happened in 2 working 2. The former used to determine the largest comprehensive stress across the main girder and maximum deflection; The latter are used to determine the main support section at the end of the maximum shear stress.2.3 sure loading project and constraint modeThe above two kinds of condition and the Lord LiangGang structure characteristics can be sure loading project as is shown in table 1.Main arms outstretched is simply supported beam model, the vertical and horizontal load, should pin end protection X, Y, Z direction of movement, the other end constraint fulcrum X and Y directions of displacement.3. Before optimization structure analysisThe above 2 by using ANSYS work conditions after loading solution, the result (see figure 2, figure 3. Figure 2 for the operation condition of the main girder comprehensive stress distribution under a cloud. Examine the stress distribution in the cloud, it is known that the main DiaoZhuangKong lug around regional stress value is higher, and in DiaoZhuangKong face appeared biggest comprehensive stress 171.778 MPa. Central main stress only 48.851 93.7 MPa. Box beam ends right Angle and acute Angle transition weld seams stress for 117.127 140.548 MPa. Figure 3 for the deflection of the main girder, the vertical direction maximum displacement 20.766 mm, horizontal direction the maximal displacement of 7.398 mm, the maximal displacement occurred in central main girder.4 structure optimization scheme4.1 the basis for the proposed schemeThe above analysis result shows that the single girder crane strength and stiffness reserve enough, this is because the design method of safety with bias, the calculation of the selection the bigger coefficient. Considering the main bearing part is the range, in no full discussion of the