Research On Topology Optimization Of Overhead Traveling Crane Steel Structure

Overhead traveling crane has been widely used in equipment manufacturing,transportation and other national pillar industries,and it occupies an important position in modern production.At present,domestic production of overhead traveling crane requires more raw materials and consumes too much energy,domestic overhead traveling cranes are overweight and materials are not fully utilized,it is urgent to optimize overhead traveling crane to lose the crane weight and lightweight the crane structure.In the composition of the crane,steel structure is an important part of the crane,and it takes up most of the weight.In steel structure of the crane,the girder occupies most of the weight.So,the optimization design of the overhead traveling crane girder of steel structure can significantly reduce the overall self-weight of the crane.At present,the method of size optimization and shape optimization is used to study the steel structure of the main girder of crane,but the theory of topology optimization is seldom used to study the main girder.Therefore,this paper studies the lightweight design of the steel structure of the overhead traveling crane by mainly using topological method,and this is of great significance to promote the development of light-weight and energy-saving direction of lifting machinery in China.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 is as follows:(1)A type of double-beam deviled overhead traveling crane is used as an example.The software HyperMesh is used to model the steel structure of the main girder of overhead traveling crane,and the model is analyzed by finite element method with the simulation software ABAQUS.The results from finite element analysis show that steel material properties of overhead traveling crane girder are not fully utilized and there is a large room for optimization.(2)The side web of overhead traveling crane girder was optimized by using variable density method and moving morphable components method in three typical working conditions.The topological results are respectively obtained with the new structure of cross shape and triangular shape,and this provided the direction for the design of the new overhead traveling crane girder structure.(3)According to the topological optimization results and feasible machining process,the new girder steel structure forms are designed.The model of the new girder steel structure was built and was analyzed by finite element method.The results show that the new girder steel structure meets the requirements of crane design,and also show that the weight of the new girder can be reduced by 1.7t comparatively with that of the original girder,the percentage of lightweight was 26.56%,and the weight loss of overhead traveling crane girder is very significant.(4)A test plan for the steel structure of the new girder was made,the prototype test of the new girder structure was carried out.The test results were obtained and analyzed,compared with the finite element analysis,the error between test results and finite element analysis is in the allowable range,the rationality of the new girder steel structure are proved.