Abstract
Purpose
Detection of early faults such as misalignment, rotor rubbing, shaft crack and bearing fault is necessary to avoid harmful and even catastrophic influences on rotating machinery.
Methods
In this paper, the accelerating horizontal and pitching vibration responses of flywheel/flexible coupling model of an actual diesel generator, with angular misalignment and rubbing faults, are investigated using the smoothed pseudo-Wigner–Ville distributions (SPWVDs).
Results and Conclusions
Numerical simulations are performed through the dynamical equations of the flywheel/flexible coupling system; the results suggest that when an angular misalignment fault occurs, the super-harmonic resonance of order 3 can be found in the horizontal and pitching vibration signals. Meanwhile, both the 3fr and 5fr components (i.e., 3 and 5 times of the rotating frequencies) can also be found in SPWV distribution spectra. When rubbing fault occurs, more abundant sub- and super-harmonic frequency components can be observed in SPWV distribution spectra. Overall, the investigation shows that the smoothed pseudo-Wigner–Ville distribution spectra reveal obvious differences between the acceleration responses of the rotating system with different faults.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Liu Z, Wu K, Ding Q, Gu JX (2019) Engine misfire diagnosis based on the torsional vibration of the flexible coupling in a diesel generator set: simulation and experiment. J Vib Eng Technol. https://doi.org/10.1007/s42417-019-00097-1
Chiou S-B, Yen J-Y (2019) A survey of suspension component specifications and vehicle vibration measurements in an operational railway system. J Vib Eng Technol 7:415–431
Merkisz-Guranowska A, Waligórski M (2018) Recognition and separation technique of fault sources in off-road diesel engine based on vibroacoustic signal. J Vib Eng Technol 6:263–271
Gibbons CB (1976) Coupling Misalignment forced. In: Proceedings of the 5th turbomachinery symposium, gas turbine laboratories. Texas A&M University, College Station, pp 111–116
Lee YS, Lee CW (1999) modelling and vibration analysis of misaligned rotor-ball bearing systems. J Sound Vib 224:17–32
Al-Hussain KM (2003) Dynamic stability of two rigid rotors connected by a flexible coupling with angular misalignment. J Sound Vib 266:217–234
Sekhar AS, Prabhu BS (1995) Effects of coupling misalignment on vibrations of rotating machinery. J Sound Vib 185:655–671
Huang J, Wang Y (2018) Transient Analysis for a twin spool rotor with squeeze-film dampers considering blade loss. J Vib Eng Technol. https://doi.org/10.1007/s42417-018-0060-1
Prabhakar S, Sekhar AS, Mohanty AR (2001) Vibration analysis of a misaligned rotor ± coupling ± bearing system passing through the critical speed. Proc Inst Mech Eng Part C J Mech Eng Sci 215:1417–1428
Chandra NH, Sekhar AS (2016) Fault detection in rotor bearing systems using time frequency techniques. Mech Syst Signal Process 72–73:105–133
Beatty RF (1985) Differentiating rotor response due to radial rubbing. J Vib Acoust Stress Reliab Des 107:151–160
Ma H, Yu T, Han Q, Zhang Y, Wen B, Xuelian C (2009) Time–frequency features of two types of coupled rub-impact faults in rotor systems. J Sound Vib 321:1109–1128
Patel TH, Darpe AK (2009) Study of coast-up vibration response for rub detection. Mech Mach Theory 44:1570–1579
Peng Z, Chu F, He Y (2002) Vibration signal analysis and feature extraction based on reassigned wavelet scalogram. J Sound Vib 253:1087–1100
Tang X, Li Q (2016) Time-frequency analysis and wavelet transform. Science Press, Beijing
Roshan-Ghias A, Shamsollahi MB, Mobed M, Behzad M (2007) Estimation of modal parameters using bilinear joint time–frequency distributions. Mech Syst Signal Process 21:2125–2136
Bossio JM, Bossio GR, De Angelo CH (2009) Angular misalignment in induction motors with flexible coupling. In: Proceedings of IEEE industrial electronics conference, 2009. IECON’09, Porto, pp 1033–1038
Yang Z, Cheng L, Wang W, Chen J (2012) Research on vibration characteristics of elastic pin coupling misalignment of pumps. China Rural Water Hydropower 9:144–147
Ding Q (2004) Backward whirl and its suppression of a SFD-mounted rotor/casing system in passage through critical speed with rubs. J Vib Control 10:561–573
Chu F, Lu W (2005) Experimental observation of nonlinear vibrations in a rub-impact rotor system. J Sound Vib 283:621–643
Hu A, Xiang L, Zhang Y (2019) Experimental study on the intrawave frequency modulation characteristic of rotor rub and crack fault. Mech Syst Signal Process 118:209–225
Funding
This work is supported by the Natural Science Foundation of China through the Grants (51575378) and Natural Science Foundation of Tianjin City (Grant number 19JCZDJC38800).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declared that they have no conflicts of interest with this work.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Liu, Z., Wu, K., Ma, Z. et al. Vibration Analysis of a Rotating Flywheel/Flexible Coupling System with Angular Misalignment and Rubbing Using Smoothed Pseudo Wigner–Ville Distributions. J. Vib. Eng. Technol. 8, 761–772 (2020). https://doi.org/10.1007/s42417-019-00189-y
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s42417-019-00189-y