Research On Lightweight Design For The Boom Structure Of Portal Crane Based On BESO

Recently,people are paying more attention to low-carbon economy 、environmental protection and other related issues.In the past,we often use analog design and experience design in the structural design of crane.In order to ensure its safety and reliability,we always give greater safety factor,which results in material waste.So,lightweight research on crane structure is becoming an important research area now and it is significant to do lightweight design for crane structure because it can promote green low-carbon designs.The boom structure of the portal crane is the main load-bearing structure,its function plays a vital role,so lightweight research on boom structure of the portal crane has great theoretical value and practical significance.In this paper,APDL which is the parametric design language of ANSYS is used to do secondary development,after that,algorithm and numerical implementation program BESO is written based on the structural optimization design theory.Using the program written to do topology optimization on boom structure of the portal crane the optimal distribution form of material is obtained.Finally after configuration trimming,a new optimized structure form of boom is obtained.The main research and achievements of this paper are as follows:(1)After analyzing the basic ideas and principles of ESO,the flow chart of ESO is given.On the basis of this,some numerical instability problems of ESO are pointed out during the actual optimization process.Then a more advanced method called BESO is research focus,and the principles of BESO method are analysed based on the research of ESO.(2)APDL which is the parametric design language of ANSYS is used to do secondary development in ANSYS software,and algorithm of ESO and BESO are programmed.Do topology optimization design for a specific example using two algorithm program written before.Through the analysis of the example,the correctness and feasibility of these two algorithms program are verified,and based on the comparative analysis of the result,it is shown that BESO method is more advanced and reliable than the ESO method.(3)The more advanced BESO method is used to perform cross-sectional shape optimization for boom structure from a initial full field rectangular region.After the optimization,it is shown that the best form of boom section is box-type structure,this result can be an evidence for the following to use box-section boom as the initial design model directly.(4)Finite element model of boom structure is built in ANSYS,then using the algorithm program of BESO which has been written before to do topology optimization design on boom structure of the crane.After the optimization,a optimal distribution form of boom material is obtained.Configuration trimming is done to optimized model,and finally a complete finite element model of boom structure is built.Through the comparative analysis of the boom structure before and after optimization,the rationality and feasibility of this optimization design is been proved.