Research On Topology Optimization Of Overhead Crane Girder

Overhead crane is widely used in industrial and mining enterprises, however, the domestic overhead crane is overweight, and its manufacture consumes too many materials, which leads to low utilization of materials, so it is necessary to lightweight the crane structure. In the structure of the overhead crane, due to the higher beam and longer span, the weight of the girder counts mostly. The weight of the overhead crane can be reduced effectively through the lightweight of the girder. Currently, there are a lot of size and shape optimization research of the overhead crane girder structure, but topology optimization study is relatively less, which can provide the guide from the perspective of conceptual design. Therefore, overhead crane girder topology optimization of has important significance.This paper is supported by the national science and technology support program project, "the research on lightweight general technology of bridge crane" (project number: 2015BAF06B01). The main research contents include the following aspects:(1) A traditional model of overhead crane girder is analyzed by finite element method. Based on the analysis, the structure of the girder was optimized using the zero order optimization method and first order optimization method. The results have shown that some steel material properties of overhead crane girder still cannot be fully utilized after lightweight optimization.(2) The section of the girder was optimized using the evolutionary structural optimization method, which got rectangular section. On the basis of the results, the vice web of the girder was optimized using variable density method, which got the cross truss structure of the vice web and the shell structure of the main web.(3) The new girder was designed and analyzed using finite element method based on the results. The results have shown that the weight of the new girder can be reduced by 1.785t comparatively with that of the original girder, the percentage of lightweight was 27.89% and by 0.965t comparatively with that of the optimized girder, the percentage of lightweight was 17.29%.(4) The sample of the girder was made and tested according to the drawings designed. The error between test results and finite element analysis is in the allowable range, which proved the correctness of the finite element calculation. The new girder can effectively reduce the weight. The new type girder provides a new structure for bridge crane lightweight girder.