Study On A Semi-physical Simulation Model For The Whole Aero-engine Vibration

The whole aero-engine vibration over level has been a major problem during the course of the development of aero-engine. The modeling and simulation method of aero-engine vibration is an important method to calculate the aero-engine vibration response, optimize the design and assembly, and evaluate the vibration state. However, due to the complexity of aero-engine structure, the whole machine vibration analysis exists lots of problems, such as a large calculation error in the simulation operation, low speed of calculation and difficulty in modeling process. This paper study a rapidly and accurately simulation model for the aero-engine vibration analysis, which is based on experiment and simulation method, synthesizing the casing-support dynamic stiffness test data into the rotor finite element simulation model. The main research work is embodied in:(1) First, discuss the modeling method of the whole aero-engine vibration, put forward the whole aero-engine vibration semi-physical simulation model based on the dynamic stiffness synthesization form and substructure synthesization method. Study the aero-engine semi-physical simulation model dynamic response calculation method and summarize the modeling process;(2) The rotor-tester with casing structure is used to verify the whole aero-engine vibration semi-physical simulation model using simulation modeling method. First of all, the 2D and 3D tester whole structure and semi-physical simulation model are established respectively; Then, the structural frequency response function and vibration response are calculated respectively; Finally, the calculation results of the whole machine model and the semi-physical simulation model are compared with each other, the analysis results of the two models achieve the same results;(3) The rotor-tester with casing structure is used to verify the whole aero-engine vibration semi-physical simulation model using experiment testing method. First of all, use modal testing method tests the whole tester frequency response function and calculate the support dynamic stiffness; Then, establish the rotor structure simulation model and updating the simulation model; Next, integrate the casing-support structure test data and rotor simulation model to establish the tester semi-physical simulation model; In the end, use the semi-physical simulation model to calculate the whole machine frequency response function and compare the results with the experimental results. The comparison reaches a good result.