Vibration analysis of rotors for the identification of shaft misalignment Part 2: Experimental validation

• Published in: Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Vol. 218; no. 9; pp. 987 - 999
• Main Authors: Saavedra, P N, Ramírez, D E
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.09.2004; SAGE PUBLICATIONS, INC
• Subjects: Automotive parts; Computer simulation; Coupling; Frequency response functions; Frequency spectrum; Machinery; Mechanical engineering; Misalignment; Predictive maintenance; Rotors; Spectra; Validation studies; Vibration analysis; rotor vibration analysis; condition monitoring; coupling misalignment
• ISSN: 0954-4062; 2041-2983
• DOI: 10.1243/0954406041991198

Abstract In Part 1 of this paper, a theoretical model to determine the dynamic behaviour of misaligned shaft rotors connected by a flexible coupling was developed. In this Part 2, experimental tests are performed to validate the model and simulation results obtained in Part 1. Vibratory characteristics, such as the frequency spectrum, waveform and phase shifts of the spectral components across the coupling are presented for different magnitudes of misalignment and types of coupling. Traditional vibration analysis rules used in practical predictive maintenance to diagnose shaft misalignment are evaluated. The influence of the frequency response functions on the amplitude of the spectral components and on the phase shifts of the spectral components across a coupling were studied. Finally, some practical conclusions for more reliable shaft misalignment identification using vibration analysis are suggested.