Lightweight Analysis Of High Strength Frame Based On HyperMesh

Today,lightweight technology is more mature,a variety of lightweight methods are applied to the actual.Among them,more and more new materials are widely used in practice,so as to obtain a lot of lightweight space.As a mature parameter optimization method,the dimension optimization technique can solve the engineering problem of discrete optimization.Compared with the traditional empirical optimization design more efficient and lower cost and cycle.In this paper,the truck frame of a company is selected as an example to carry out finite element analysis,experimental verification and lightweight design.Based on the present situation of lightweight research,and consulting a large number of relevant literature,this paper explores the use of high strength steel to replace the original frame material and then use the light weight optimization method.Firstly,the 3D solid model of the frame is cleaned and checked by UG.Then,the finite element analysis model of the frame is established by introducing the HyperMesh software,which is divided into the grid pretreatment,the grid partition,the connection unit and the simulation boundary conditions.In addition,the finite element model is added with the material properties of Q345 and the external load and constraint.The finite element method and OptiStruct solver are used to analyze the stress and displacement of the frame.The results show that the stiffness of the frame meets the requirements,but the safety factor of Q345 indicates that the lightweight space is insufficient.The use of high strength dual phase steel DP590 instead of ordinary steel Q345,not only higher strength,but also the safety factor of DP590 shows that the potential for lightweight.The finite element model of the frame is analyzed by the OptiStruct solver,and the dynamic signal analyzer which is provided by Donghua testing company is used to verify the reliability of the finite element model.According to the theory of size optimization,the mathematical model of lightweight design is established.The results show that the frame of DP590 material is better than the original one,and the quality of the optimized frame is reduced by 23.4% when the stiffness of the frame and the natural frequency of the second order are not reduced.Even after the thickness adjustment,the frame quality is still reduced by 17.3%.Then the topology optimization is carried out on the basis of the size optimization model,and the weight reduction 15.57 kg is achieved by adjusting the model structure according to the optimization results,and the total optimization ratio reaches 19.9%.Therefore,the purpose of lightweight is achieved,and it is proved that it is feasible to carry out lightweight design with high strength steel.