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Application of Full Spectrum Analysis for Rotor Fault Diagnosis

  • Tejas H. Patel
  • Ashish K. DarpeEmail author
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 1011)

Abstract

Machine vibration signal carries abundant information, including the machine health condition. Reliable and foolproof fault detection needs accurate knowledge of the dynamic response features of the faulty system as well as proper method to extract it. The paper presents experimental investigation of steady state vibration response of the rotor bearing system with rotor faults such as unbalance, crack, rotor-stator rub and misalignment at sub-critical rotational speeds. Test rigs are designed and fabricated for the purpose. The conventional Fourier spectrum (i.e., FFT) has limitations in exhibiting the whirl nature (i.e., forward/backward whirl) of the rotor faults. It has been observed in the past that the several other rotor faults generate higher harmonics in the Fourier spectrum. Hence there is always a level of uncertainty in the diagnosis based on FFT when other faults are also suspected. Present work through the use of full spectra has shown possibility of diagnosing these rotor faults through unique vibration features exhibited in the full spectra. The present investigation focuses on the directional nature of higher harmonics, in particular the 2X component. This provides an important tool to separate rotor faults that generate similar frequency spectra (e.g., crack and misalignment) and lead to a more reliable fault diagnosis. Crack, rub and misalignment fault identification through a full spectrum analysis is verified on a laboratory test rotor set-up.

Keywords

Rotor fault diagnosis Misaligned rotor Cracked rotor Rotor-stator rub Full spectrum Experimentation 

References

  1. 1.
    Muszynska, A.: Rotor-to-Stationary Part Rubbing Contact in Rotating Machinery in Rotordynamics. CRC Press, Taylor and Francis Group, Boca Raton, pp. 555–710 (2005)Google Scholar
  2. 2.
    Rao, J.S.: Vibration Condition Monitoring of Machines. Narosa Publishing House, New Delhi (2000)Google Scholar
  3. 3.
    Dimarogonas, A.D.: Vibration of cracked structures: a state of art review. Eng. Fract. Mech. 55, 831–857 (1996)CrossRefGoogle Scholar
  4. 4.
    Sabnavis, G., Kirk, R.G., Kasarda, M., Quinn, D.: Cracked shaft detection and diagnostics: a literature review. Shock Vib. Dig. 36, 287–296 (2004)CrossRefGoogle Scholar
  5. 5.
    Sinou, J.J., Lees, A.W.: The influence of cracks in rotating shafts. J. Sound Vib. 285, 1015–1037 (2005)CrossRefGoogle Scholar
  6. 6.
    Zhou, T., Sun, Z., Xu, J., Han, W.: Experimental analysis of cracked rotor. J. Dyn. Syst. Meas. Control 127, 313–320 (2005)CrossRefGoogle Scholar
  7. 7.
    Patel, T.H., Darpe, A.K.: Vibration response of a cracked rotor in presence of rotor-stator rub. J. Sound Vib. 317, 841–865 (2008)CrossRefGoogle Scholar
  8. 8.
    Wen, W.C., Wang, Y.C.: Theoretical research, calculation and experiments of cracked shaft dynamic response. Proc. IMechE Conf. London 473–478 (1988)Google Scholar
  9. 9.
    Darpe, A.K., Gupta, K., Chawla, A.: Transient response and breathing behaviour of the cracked Jeffcott rotor. J. Sound Vib. 272, 207–243 (2004)CrossRefGoogle Scholar
  10. 10.
    Papadopoulous, C.A., Dimarogonas, A.D.: Coupled vibrations of a cracked shaft. J. Vib. Acoust. 114, 461–467 (1992)CrossRefGoogle Scholar
  11. 11.
    Darpe, A.K., Gupta, K., Chawla, A.: Coupled bending, longitudinal and torsional vibrations of a cracked rotor. J. Sound Vib. 269, 33–60 (2004)CrossRefGoogle Scholar
  12. 12.
    Chu, F., Zhang, Z.: Periodic, quasi-periodic and chaotic vibrations of a rub impact rotor system supported on oil film bearings. Int. J. Eng. Sci. 35, 963–973 (1997)zbMATHCrossRefGoogle Scholar
  13. 13.
    Patel, T.H., Darpe, A.K.: Use of full spectrum cascade for rotor rub identification. Adv. Vib. Eng. 8, 139–151 (2009)Google Scholar
  14. 14.
    Gibbons, C.B.: Coupling misalignment forces. In: Proceedings of the 5th Turbo Machinery Symposium Gas Turbine Laboratory, Texas A & M University, Texas, 111–11306 (1976)Google Scholar
  15. 15.
    Sekhar, A.S., Prabhu, B.S.: Effects of coupling misalignment on vibration of rotating machines. J. Sound Vib. 185, 655–671 (1995)zbMATHCrossRefGoogle Scholar
  16. 16.
    Xu, M., Marangoni, R.: Vibration analysis of a motor-flexible coupling-rotor system subjected to misalignment and unbalance, part I: theoretical model and analysis. J. Sound Vib. 176, 663–679 (1994)zbMATHCrossRefGoogle Scholar
  17. 17.
    Al-Hussain, K.M., Redmond, I.: Dynamic response of two rotors connected by rigid mechanical coupling with parallel misalignment. J. Sound Vib. 249, 483–498 (2002)CrossRefGoogle Scholar
  18. 18.
    Patel, T.H., Darpe, A.K.: Experimental investigations on vibration response of misaligned rotors. Mech. Syst. Signal Process. 23, 2236–2252 (2009)CrossRefGoogle Scholar
  19. 19.
    Goldman, P., Muszynska, A.: Application of full spectrum to rotating machinery diagnostics. Orbit First Q. 20(1), 17–21 (1999)Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of AlbertaEdmontonCanada
  2. 2.Department of Mechanical EngineeringIndian Institute of TechnologyNew DelhiIndia

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