Topology Optimization Design For Frame Structure Of All Terrain Crane

With the development of crane leasing industry,all terrain crane has become the future development trend of mobile crane because of its higher performance and more comprehensive use environment.As one of its main stress components,the performance of frame structure is related to the whole vehicle performance of all terrain crane.In order to make all terrain crane play a greater advantage in the process of lifting and running,weight reduction plays an important role in the optimization design of various enterprises.In this article,the frame structure of TZM260 all terrain crane is taken as the research object.Through the analysis of the stress situation of the frame structure,the dangerous working condition is determined.Under the dangerous working condition,the Optistruct module in Hyperworks is used to carry out the finite element static analysis.Through the finite element analysis results and the functional characteristics of its own structure,the internal rib plate of the frame structure is selected as the topology optimization area.By using variable density method,the SIMP interpolation model is established and optimization criterion algorithm is selected.The frame structure is optimized under single working condition with minimum flexibility as objective function.It is found that the frame structure obtained by topology optimization under single working condition can not meet the requirements of all working conditions.Then,the linear weighted sum method and compromise programming method are used to establish the multi condition topology optimization objective function.By selecting the appropriate weight coefficient and setting the accurate optimization parameters,the frame structure is optimized under multiple working conditions.Through comparative analysis,the more reasonable optimization results are selected to improve the frame structure.According to the topology optimization results of multi working conditions and the actual manufacturing situation,a new layout design of the internal rib plate of the frame structure is established,and the finite element analysis of the optimized frame structure is carried out.Through the comparative analysis of the frame structure before and after the optimization,it is concluded that the weight of the internal rib plate is reduced by 22% and the overall weight of the frame is reduced by 7% under the premise of ensuring the mechanical properties.The lightweight design of frame structure is realized,and the purpose of frame structure weight reduction is achieved.At the same time,it provides guidance for the optimization design of frame structure.