Simulation Of Aero-engine Vibration Fault And Optimization Of Casing Measurement Point

Online acquisition of aircraft through various types of sensors and intelligent fault diagnosis is one of the directions of aviation development.With the successful use of condition monitoring and fault diagnosis system,the probability of crash is reduced.Aero-engine is the most important part of the aircraft,but also the focus of condition monitoring.For aircraft engines,the optimal placement of the measuring points can effectively capture the engine rotor failure characteristics while simplifying the complexity of the monitoring system.Therefore,it has important practical significance to guarantee the success rate of fault diagnosis.Compared with the developed countries,the research of aero engine vibration monitoring and fault diagnosis is relatively backward in china.In this paper,a single rotor tester and double rotor tester are used as the research object,which are studied by numerical analysis method,point optimization theory and experiment.In this paper,first,the theory of finite element analysis and the theory and method of measuring point optimization are introduced.Second,numerical casing-rotor coupling models are established for the single rotor tester and double rotor tester,and the two models are simulated and analyzed by using the commercial finite element software obtained rotor displacement,critical speed and model displacement response results under unbalanced fault condition.So the characteristics of rotor unbalance fault response are studied.Third,using the massed casing measuring point optimization method and structure of power flow visualization method to determine single and double rotor tester casing measuring points.Comparing the characteristics and applicability of the two optimization methods,the former one is selected and the final layout of the casing's measuring is determined.Finally,using the single rotor tester to carry out the rotor unbalance failure simulation test,the loose fault test and the rubbing fault test.Test results prove that the model and the calculation result are accurate and the above methods can optimize the casing measurement points.The work and conclusions of this paper provide a better reference for the optimization of the problem of the measuring point of the aeroengine or gas turbine vibration.