Design And Analysis Of Supporting Structure Of Fan Rotor Experimental Model

Aero engine is an extremely important flight power source.With the demand and development of the society,the performance requirements of the aero engine are getting higher and higher,which leads to the overall structure of the aero engine becoming more complex.In the analysis and research of aeroengine,rotor vibration is an extremely important part,and the relevant data of rotor vibration can also provide a clear direction for the research of aeroengine.Experimental study is the most important and core research method for the study of vibration fault in aeroengine.Through the experimental study,a large number of test data can be obtained for vibration failure and other related theoretical research.At the same time,a large number of data obtained for the engine research is very important,including the basic research,the whole machine design and manufacturing,etc.But,because of the large equipment structure generally with complex structure,large volume,a huge number of coupling factors and the characteristics of its production cost in the process of the vibration test is made to the ontology research are influenced by the strict test,the limitation of many aspects,such as cost,at this point,it is necessary to model experiment was carried out.In this paper,the rotor system of the fan section of the aero-engine is deeply studied.Through the design and analysis of the elastic supporting components,the establishment of the rotor system model,the dynamic characteristics of the rotor system analysis,the typical vibration analysis and the model test,a series of contents are deeply analyzed.The main contents of this paper are as follows:(1)In Ansys software,the dynamic model of elastic support rotor system is established,its finite element simplification model and three-dimensional finite element model are established respectively,and the inherent characteristics of rotor finite element simplification model and 3D finite element model are compared to verify the correctness of model establishment,and the law of influence of support stiffness on the inherent characteristics of rotor system is studied.(2)Determine the left and right stifness values of the elastic support according to the requirements of the critical speed of the fan section rotor tester,and further determine the range of the stiffness value of the elastic ring assembly,and then design the structural parameters of the elastic ring support assembly in the elastic support rotor system,the stiffness of elastic rings is calculated and finite element simulation analysis is performed to compare with theoretical calculations,check the strength of the elastic ring and analyze the cycle life of the elastic ring,on the basis of two-dimensional elastic ring analysis,three-dimensional simulation verification is carried out,and furthermore,the influencing factors of the elastic ring stiffness were analyzed,and the variation law of the elastic ring stiffness with its structural parameters was summarized.Finally,the stiffness test of the elastic ring is carried out to verify its correctness by comparing with the simulation.(3)Based on finite element modeling analysis,on the basis of the intrinsic characteristics of counter rotating subsystem based on Ansys finite element analysis,the intrinsic characteristics of counter rotating subsystem based on Matlab numerical simulation analysis,further proposed using spring bearing instead of the elastic ring complex components supporting the finite element simulation method,by contrast with each other to verify the feasibility of finite element simulation method is more simple and faster,at the same time using spring bearing the simplified finite element simulation method,analyzed the influence factors upon the natural frequencies of rotor system.(4)The sensitivity analysis of the unbalance response of the fan rotor system is carried out,the detailed modeling and analysis process is given,and the unbalance test experiment is carried out with the rotor system connected with the disk and shaft,and the unbalance simulation analysis of the rotor subsystem is carried out and compared with the experimental results.