Research On Topology Optimization Design Technology Of Turbine Disk Based On OptiStruct

Turbine disk is the core component of aero-engine.The performance of turbine disk directly determines the performance of aero-engine.The turbine disk is in the harsh environment of high temperature,high pressure and high speed for a long time,which is greatly influenced by temperature load and mechanical load..Topology optimization has unique advantages over traditional design in terms of high quality optimization of structure and efficient distribution of materials.Based on the requirements of stability,manufacture and assembly,the topology optimization of the original model of turbine disk is studied in this paper,and the optimized turbine disk model is evaluated in general.Firstly,the basic theories of finite element,modal analysis and static analysis as well as OptiStruct and other software modules used in this paper for topology optimization are introduced.Then the basic theory and modeling method of variable density method for topology optimization and the SIMP material interpolation model used to suppress the intermediate density of materials are summarized.On this basis,a three-dimensional solid model of the turbine disk is established,and thermal-structural coupling analysis,modal analysis and static analysis of the turbine disk are carried out.In addition,control variable method is used to study the factors affecting the displacement and stress distribution of the turbine disk.Secondly,on the basis of thermal-structural coupling analysis,the constant temperature loads are loaded into the model.According to the steps of topology optimization analysis,the design space of turbine disk was defined,and a topology optimization model with unit density as the design variable,volume response and stress response as constraint functions and minimum compliance as the objective function was established to complete the topology optimization calculation of turbine disk.Then the optimization results were rounded and smoo thed to obtain three topological optimization models of the turbine disk,and three kinds of optimized resin samples are printed by 3D printing technology.Finally,the modal characteristic parameters,isotropic displacement and stress distribution of the three optimization schemes are analyzed,and an optimal topology optimization scheme is selected,which reduces the weight of the turbine disk by 11.11% while enhancing the performance of the structure.The lightweight design of turbine disk is realized.