Research On Topology Optimization Design Of Aeroengine Turbine Disk Structure

The aero-engine is the heart of the human being.The performance of the engine has a decisive influence on it.Among the performance indexes of the engine,lightweight is an important R & D index.The subject of lightweight is to improve the thrust to weight ratio of the engine,so as to improve the performance of the aircraft.The turbine disk is an important component of the engine,and its structural performance has a great impact on the performance of the engine,so it is very necessary to optimize the structure of the turbine disk.In view of the limitations of traditional shape optimization,this paper takes a certain type of Aero-engine Turbine Disk as the optimization configuration,establishes a complete topology optimization process,and completes the optimization design of the turbine disk.The purpose of this paper is to realize the hollow structure design of the disk,so the stiffness topology optimization,stress topology optimization and frequency topology optimization are carried out respectively,and a set of topology optimization process for additive manufacturing of turbine disk is established.The finite element analysis and optimization process of this paper are programmed in MATLAB program.The main contents of this paper are as follows(1)Taking the sector model of the disk as the optimization model and the maximum flexibility of the disk as the objective,the topology optimization of the meridian surface of the disk is carried out.At the same time,the variable connection is added to ensure the circumferential continuity and consistency of the digging hole.Then,aiming at the problem of excessive digging hole,the optimization algorithm of size control is combined to control the digging hole size.Finally,the current popular lattice optimization is carried out,The optimal design of periodic structure based on substructure is carried out.(2)The stress of turbine disk is an important performance index.In order to solve this problem,a topology optimization method with the stress of turbine disk as the constraint function is proposed.The K-S function is used as the aggregation function to calculate the maximum stress of the concerned region.The final optimization results not only meet the lightweight optimization objectives,but also reduce the stress significantly,and achieve good optimization results.(3)As a rotating part,the dynamic characteristics of turbine disk must be considered in the optimization.Therefore,the topology optimization with frequency as the objective is proposed,and the optimization calculation method of rotating periodic structure frequency is proposed.The final optimization results not only meet the lightweight optimization goal,but also avoid the resonance point of a certain order frequency,so the optimization effect is better.