Improvement of the vibration diagnostics of rotation shaft damage based on fractal analysis

• Autorzy: Bouraou N. , Pavlovskyi O. , Pazdrii O.
• Konferencja: Symposium Vibrations In Physical Systems (27 ; 09-13.05.2016 ; Będlewo koło Poznania ; Polska)
• Języki publikacji: EN

Abstrakty

EN

This work is devoted to further research and improvement of the vibration diagnostics of the initial crack-like damage of rotation shaft in aviation gas-turbine engines (GTE). We propose to use fractal analysis of the accelerating shaft response in order to increase the damage detection efficiency. Responses of the accelerating shaft are derived by using simulation in absence and in presence of the initial traverse crack. The responses of the cracked shaft have sub-critical peaks; the increase in size of a crack leads to the increase in peak values of the vibration amplitude in the range of sub-harmonic resonances. The Hurst exponent is obtained for the time series in the range of sub-harmonic resonances. The research shows that a small change in the crack size results in considerable change of the Hurst exponent, which allows to detect the mentioned sub-harmonic resonances of the measured signal in order to identify the initial crack-like damage of the rotation shaft.

Słowa kluczowe

EN

gas-turbine engine; cracked shaft; vibration diagnosis; fractal analysis; Hurst exponent

PL

silniki gazo-turbinowe; pęknięcie wału; diagnostyka wibracyjna; analiza fraktalna; wykładnik Hursta

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2016
• Tom: Vol. 27
• Strony: 61--66
• Opis fizyczny: Bibliogr. 5 poz., wykr.

Twórcy

autor

Bouraou N.

• National Technical University of Ukraine Kyiv Polytechnic Institute, 37 Peremogy Pr., Kyiv, Ukraine

autor

Pavlovskyi O.

• National Technical University of Ukraine Kyiv Polytechnic Institute, 37 Peremogy Pr., Kyiv, Ukraine

autor

Pazdrii O.

• National Technical University of Ukraine Kyiv Polytechnic Institute, 37 Peremogy Pr., Kyiv, Ukraine

Bibliografia

• 1. O. Pavlovskyi, N. Bouraou, L. Iatsko, Multilevel vibration control system of aviation gas-turbine engines, Vibrations in Physical Systems, 25 (2012) 323 – 328.
• 2. O. Pavlovskyi, N. Bouraou, On-board vibration diagnostics of shaft damage of the aviation engine, Vibrations in Physical Systems, 26 (2014) 229 – 234.
• 3. J. Feder, Fractals, Plenum Press, New York, 1988.
• 4. M. A. Sanchez Granero, J. E. Trinidad Segovia, J. Garcia Perez, Some comments on Hurst exponent and the long memory processes on capital markets, Physica A, 387 (2008) 5543 – 5551.
• 5. J. Sawicki, X. Wu, G. Baaklini, A. Gyekenyesi, Vibration-based crack diagnosis in rotating shafts during acceleration through resonance, Proc. of SPIE, 5046 (2003) 1 – 10.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.