Research on Diagnosis Method of Rotor Misalignment-bumping Coupling Fault Based on Nonlinear Output Frequency Response Function

doi:10.3901/JME.2019.19.084

Abstract

Abstract: Based on the unique advantages of the nonlinear output frequency response function (NOFRF), the nonlinear output frequency response function is introduced to the rotor system with coupling faults of misalignment and rub-impact, a fault diagnosis method based on NOFRF for coupling faults of misalignment and rub-impact is proposed. The proposed method used to identify the NOFRF values of rotor systems with different degrees of misalignment and different angles, and the influence of misalignment and angle on the NOFRF values of various orders of the rotor system is analyzed. The simulation results show that the second harmonic second-order NOFRF value and the fourth-order NOFRF value have a significant increase with the increase of misalignment and angle. The first harmonic third-order NOFRF value decreases with the increase of misalignment angle. Therefore, the degree of misalignment of the rotor system can be identified based on the variation of the second harmonic second-order NOFRF value, the second harmonic fourth-order NOFRF value and the first harmonic third-order NOFRF value. Finally, the experimental results verify the correctness of the simulation results. The research results obtained provide an important evidence for fault diagnosis of rotor systems with coupling faults of misalignment and rub-impact.

Key words: nonlinear output frequency response function, rotor misalignment, rubbing, fault diagnosis, system identification

CLC Number:

TH17

LI Zhinong, LI Yunlong, DIAO Haiyang. Research on Diagnosis Method of Rotor Misalignment-bumping Coupling Fault Based on Nonlinear Output Frequency Response Function[J]. Journal of Mechanical Engineering, 2019, 55(19): 84-91.

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