Dynamic modeling for inter-shaft bearings with surface local defect considering elasto-hydro lubrication effects#br#
TIAN Jing1, AI Yanting2, ZHAO Ming1, SUN Dan2, ZHANG Fengling2
1. School of Power and Energy, Northwestern Polytechnic University, Xi’an 710072, China;
2. Liaoning Provincial Key Lab of Advanced Test Technology for Aeronautical Propulsion System, Shenyang Aerospace University, Shenyang 110136, China
Inter-shaft bearings of an aero-engine are located at the place between its high pressure rotor and low pressure one. The inner and outer rings of inter-shaft bearing rotate in the same direction or opposite one with high and low pressure rotors, and their relative rotating speed is high and lubrication condition is bad to cause frequent occurrence of faults. Here, aiming at vibration fault diagnosis of inter-shaft bearings with surface local defect, a dynamic modeling method for them was proposed considering effects of elasto-hydro dynamic lubrication and time-varying displacement excitation. A dual-rotor test platform was used to conduct analog tests for outer ring fault of inter-shaft bearing, and vibration signals were collected and analyzed. Comparing the numerical simulation results of the established dynamic model and the test ones, the correctness of the established dynamic model was verified. Based on the established dynamic model, vibration responses of inter-shaft bearings with and without lubrication under different defect sizes were numerically simulated. The results showed that the model built here can be used to correctly simulate vibration responses of inter-shaft bearings under different conditions and different defect sizes, and analyze the fault mechanism of inter-shaft bearings.
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