Abstract
This paper introduces a method for the identification of the position and the depth of a transverse crack in a rotor system, by using vibration measurements. As it is reported in literature and from field experience, a transverse crack modifies the dynamic behaviour of the rotor, generating in a horizontal axis shaft periodical vibrations with 1x, 2x and 3x rev. components. A model-based diagnostic approach and a least-squares identification method in the frequency domain are used for the crack localisation along the rotor. The crack depth is calculated by comparing the static bending moment, due to the rotor weight and to the bearing alignment conditions, to the identified 'equivalent' periodical bending moment, which simulates the crack. Finally, the validation of the proposed method is carried out statically and dynamically by means of experimental results obtained on a test-rig.
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References
Allianz, ALLIANZ Berichte, nr. 24 Nov. 1987.
Dimarogonas, A.D., 'Vibration of cracked structures. A state of the art review', Engng Fract. Mech. 55 (1996) 831-857.
Bachschmid, N., Pennacchi, P., Tanzi, E. and Audebert, S., 'Identification of transverse cracks in rotors systems', Proc. ISROMAC-8 Conf., 26-30 March 2000, Honolulu, Hawaii, pp. 1065-1072.
Isermann, R., 'Fault detection and diagnosis: methods and applications', In: Proc. 2nd Int. Symp. on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, CETIM, Senlis, October 1995.
Bachschmid, N., Pennacchi, P., Tanzi, E. and Vania, A., 'Accuracy of modelling and identification of malfunctions in rotor systems: experimental results', J. Braz. Soc. Mech. Sci. XXII(3) (2000) 423-442
Bachschmid, N., Vania, A., Tanzi, E. and Pennacchi, P., 'statical and dynamical behaviour of rotors with transversal crack-Part I: Comparison between different models', In: Proc. XIV Congresso Nazionale AIMETA, Como, 6-9 ottobre 1999.
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Bachschmid, N., Pennacchi, P., Tanzi, E. et al. Identification of Transverse Crack Position and Depth in Rotor Systems. Meccanica 35, 563–582 (2000). https://doi.org/10.1023/A:1010562205385
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DOI: https://doi.org/10.1023/A:1010562205385