Vibration measurement for crack and rub detection in rotors

• Autorzy: Hajnayeb Ali , Shirazi Kourosh Heidari , Aghaamiri Reza

Identyfikatory

DOI

10.24425/mms.2020.131719

• Języki publikacji: EN

Abstrakty

EN

Shaft-stator rub and cracks on rotors, which have devastating effects on the industrial equipment, cause non-linear and in some cases chaotic lateral vibrations. On the other hand, vibrations caused by machinery fault scan be torsional in cases such as rub. Therefore, a combined analysis of lateral and torsional vibrations and extraction of chaotic features from these vibrations is an effective approach for rotor vibration monitoring. In this study, lateral and torsional vibrations of rotors have been examined for detecting cracks and rub. For this purpose, by preparing a laboratory model, the lateral vibrations of a system with crack and rub have been acquired. After that, a practical method for measuring the torsional vibrations of the system is introduced. By designing and installing this measurement system, practical test data were acquired on the laboratory setup. Then, the method of phase space reconstruction was used to examine the effect of faults on the chaotic behaviour of the system. In order to diagnose the faults based on the chaotic behaviour of the system, largest Lyapunov exponent (LLE), approximate entropy (ApEn) and correlation dimension were calculated for a healthy system and also for a system with rub and a crack. Finally, by applying these parameters, the chaotic feature space is introduced in order to diagnose the intentionally created faults. The results show that in this space, the distinction between the various defects in the system can be clearly identified, which enables to use this method in fault diagnosis of rotating machinery.

Słowa kluczowe

EN

rotor vibrations; crack; rub; fault detection; chaos features; largest Lyapunov exponent; approximate entropy; correlation dimension

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2020
• Tom: Vol. 27, nr 1
• Strony: 65--80
• Opis fizyczny: Bibliogr. 26 poz., rys., wykr., wzory

Twórcy

autor

Hajnayeb Ali

• Shahid Chamran University of Ahvaz, Faculty of Engineering, Ahvaz, Daneshgah Square, Iran

autor

Shirazi Kourosh Heidari

• Shahid Chamran University of Ahvaz, Faculty of Engineering, Ahvaz, Daneshgah Square, Iran

autor

Aghaamiri Reza

• Shahid Chamran University of Ahvaz, Faculty of Engineering, Ahvaz, Daneshgah Square, Iran

Bibliografia

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Uwagi

EN

1. The authors would like to thank Shahid Chamran University of Ahvaz for their financial support.

PL

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).