Research on dynamic characteristics of aero-engine high-pressure rotor connection component loosening fault
To study the effects of the connection component loosening fault in aero-engine high-pressure rotor,a Timoshenko beam model considering loosening fault was established.The influences of joint surface stiffness,speed,number of loose bolts,position of loosening fault and tightening torque on rotor dynamics were discussed.The results of theoretical analysis were verified by experiments.The results showed that there was an obvious subcritical resonance in the speed-up process of the fault system,and the critical peak speed was generated in advance.The more number of loose bolts indicated the more obvious period-doubling bifurcation of the system.The loosening fault was located in the middle of the rotor span,which had a great influence on the system dynamics.When the bolt tightening torque was reduced,the second critical peak speed of the system was generated in advance.The experimental data were in good agreement with the results of theoretical analysis,and the proposed theoretical method had certain accuracy and applicability.The research results provide a theoretical and experimental basis for further study on connection component loosening fault of aero-engine high pressure rotor.
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