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Purpose <p>Compared with the single fault, the coupling of crack and rubbing is more serious and has a significant impact on the stable operation of rotor systems in engineering. Based on the unique advantage of nonlinear output frequency response function (NOFRF), namely, whether the transmission characteristics of the system have changed, it can be used to determine whether the system has a fault. The nonlinear spectral can identify the variation of the system by not only the first spectral but also the second and third spectral, and can effectively distinguish faults that have similar frequency characteristics on the signal spectrum and are difficult to distinguish.</p> Methods <p>In this paper, NOFRF is introduced into rotor crack fault diagnosis, a fault diagnosis method of rub-crack coupling in the rotor system based on the NOFRF is proposed. Firstly, a dynamic model of the rotor system with rub-crack coupling faults is established. The variations of NOFRF values of the rotor system with different crack depths and rubbing clearances are compared.</p> Results and Conclusions <p>The simulation results show that the second harmonic second-order NOFRF value, second harmonic 4th-order NOFRF value, and 4th harmonic fourth-order NOFRF value can effectively distinguish degrees of rubbing severity and different crack depths. The effectiveness of the proposed method is verified by experiments. The research results provide an important basis for the fault diagnosis of the rotor system with rub-crack coupling faults.</p>

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Fault Diagnosis Method of Rub-Crack Coupling Fault in Rotor System Based on Nonlinear Output Frequency Response Function

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Zhinong Li,
  • Aihui Gu,
  • Fengtao Wang,
  • Shengrong Long,
  • Changming Cheng,
  • Shijian Zhou

摘要

Purpose

Compared with the single fault, the coupling of crack and rubbing is more serious and has a significant impact on the stable operation of rotor systems in engineering. Based on the unique advantage of nonlinear output frequency response function (NOFRF), namely, whether the transmission characteristics of the system have changed, it can be used to determine whether the system has a fault. The nonlinear spectral can identify the variation of the system by not only the first spectral but also the second and third spectral, and can effectively distinguish faults that have similar frequency characteristics on the signal spectrum and are difficult to distinguish.

Methods

In this paper, NOFRF is introduced into rotor crack fault diagnosis, a fault diagnosis method of rub-crack coupling in the rotor system based on the NOFRF is proposed. Firstly, a dynamic model of the rotor system with rub-crack coupling faults is established. The variations of NOFRF values of the rotor system with different crack depths and rubbing clearances are compared.

Results and Conclusions

The simulation results show that the second harmonic second-order NOFRF value, second harmonic 4th-order NOFRF value, and 4th harmonic fourth-order NOFRF value can effectively distinguish degrees of rubbing severity and different crack depths. The effectiveness of the proposed method is verified by experiments. The research results provide an important basis for the fault diagnosis of the rotor system with rub-crack coupling faults.