Topology Optimization Design Of Mine Truck Cab Based On SIMP Theory

Mine dump truck is more vulnerable to cause rollover accidents,in the case of rollover accident occurred in the cab,it will be produce a great lateral shock and lead to the deformation or even destruction on the cab frame structure.Moreover,It will threatens the safety of the occupants.So,if the cab structure design is unreasonable,the accident will cause great threat to the lives of the crew.Topology optimization design has changed the traditional design process of repeated design,check and modify.This optimized design method saves time and improves design efficiency.The research and application of topology optimization of continuum structures is a hot research topic,especially in the field of automotive structure optimization.In this paper,a conceptual design of the cab of dump truck is designed,which is used to subvert the traditional structure design.Based on the theory of variable density topology optimization,the multi-objective topology optimization design of the mine dump truck cab is introduced.Based on the variable density method in the OptiStruct optimization module of Hypermesh,a multi-objective optimization mathematical model is proposed and based on the compromise programming method,a multi-objective optimization mathematical model is proposed to solve the problem of the maximum stiffness and the first order natural frequency at the same time.After optimization,the optimal structure layout is obtained,The main contents are as follows:(1)Firstly,the topological optimization design area of the cab is divided,including the design area and the non-design area;Then,the mathematical model of topology optimization is established according to the loading condition of the cab,including the optimization model of the stiffness and the natural frequency under the single condition;The topology optimization design of the cab is carried out in the Optistruct optimization module,and the multi-objective topology optimization design under the condition of multiple static loads is carried out by using the compromise programming method.(2)On the basis of multi-objective topology optimization,the thickness of each part of the cab is selected as the design variable,and the approximate model is built by using the selected design variables to verify the accuracy of the model;Then,the sensitivity of the design variables is analyzed by Isight,and the variables that have a greater impact on response are selected as the design variables.Finally,based on the genetic algorithm,the multi-objective optimization design of the cab is carried out,and the Pareto optimal solution is selected according to the requirements of the enterprise.(3)The performance of the new and old cab is compared after the multi-objective topology optimization,including the lateral energy absorption,the lateral deformation,the mode shape and so on.By comparison,it is found that the performance of the cab with topology optimization is improved,and it has certain reference value for the engineering design personnel of the conceptual design of the cab.