Study On Dynamic Characteristics Of Graphene Enhanced Functionally Graded Rotor System

The rotor system is the core component of rotating machinery and occupies an extremely important position in the industrial system.With the continuous development of the industry,the performance and reliability requirements of rotating machinery are getting higher and higher.Especially aero engines,as the heart of the aircraft,have a direct impact on the performance,reliability and economy of the aircraft.In addition to traditional metal materials,due to the advantages of graphene and other materials with extremely high tensile strength,stiffness and corrosion resistance,people began to apply it to the rotor system of aero-engines,so the effect of graphene parameters on the rotor system was studied.The influence of kinetic characteristics is of great significance.In this paper,the free vibration analysis and dynamic characteristics analysis are carried out on the simplified rotor system and compressor blade disc system.The main research contents include:(1)First,the finite element model of the disc-shaft rotor system was established by using the finite element software ANSYS,and the free vibration characteristics of the grapheneenhanced functionally graded disc-shaft rotor system were studied.The three distribution modes of GPLs in the matrix are simulated in a layered manner,and the layered material parameters are determined using the modified Halpin-Tsai model and mixing rules.The content of GPLs,the distribution mode of GPLs,the aspect ratio and aspect ratio of GPLs,and the influence of the geometric parameters of the rotor on the free vibration characteristics of the disc-shaft coupling system are discussed,which provides a basis for the design of the functionally graded material disc-shaft coupling system.(2)On the basis of graphene-enhanced functionally graded material disc-shaft coupling,the modeling and free vibration analysis of graphene-enhanced functionally graded porous blade-disk-shaft assembly are studied.The rotor is enhanced by graphene-enhanced functionally graded porous Made of metal matrix.The uniform and non-uniform distribution of GPLs and pores in the rotating component are considered.Then,based on the Chebyshev interval finite element method based on derivative information,the change law of the steadystate response of different parameters of the blade-disk-shaft rotor system under different fluctuation coefficients is discussed.(3)In view of the large number of elements and nodes in the finite element model of the aero-engine compressor detuning blisk system,the dense modal identification method and the sub-structure fixed interface modal synthesis method are combined to perform reduced modeling of the blisk system.Comparing the frequency results obtained by the sub-structure fixed interface modal synthesis method based on dense modal recognition and the traditional overall method,the results show that the method adopted in this paper saves time and ensures calculation accuracy.(4)Taking the first-stage detuning blisk of an aero engine compressor as the research object,a simplified model of the functionally graded material porous blisk system is established in ANSYS.The imbalance is applied to the axis,and the method of judging the load is used to simulate the rubbing of the blisk system.The characteristics of the rubbing process of the blisk are analyzed.In addition,the amount of blade detuning and the initial between the blade and the casing are discussed.The effect of the change of the gap,the speed of the blisk system and the content of GPLs in the blade on the non-linear characteristics of the blisk system.