Experimental Investigation of Misalignment Effects on Rotor Shaft Vibration and on Stator Current Signature
- 649 Downloads
Misalignment is one of the most common faults in any rotating machine. It can cause decrease in efficiency and in the long run may cause failure of machine. Most of the researchers, consider only vibration information for the misalignment. However, this paper inspects the different types of misalignments by using diagnostic medium such as stator current signature as well as rotor vibration signal and it is being found that current signature alone can predict the misalignment effect without use of vibration signal. Diagnostic features obtained by FFT related to misalignments have been explained. Orbit plots are effectively used to explain the unique nature of misalignment fault. In this study, shaft displacement and stator current samples during machine run up under aligned as well as misaligned conditions are measured and analyzed. Result shows that misalignment is the parameter that is more responsible for the cause of instability.
KeywordsParallel misalignment Angular misalignment Fast Fourier transform Motor current signature analysis Fault diagnosis
The authors would like to acknowledge the support provided by Indian Institute of Technology Patna for assistance with this work.
- 1.S.R. Bognatz, Alignment of critical and non critical machines. Orbit, 23–25 (1995)Google Scholar
- 3.J.M. Bossio, G.R. Bossio, C.H. De Angelo, Angular misalignment in induction motor with flexible coupling. Proceedings of the IEEE IECON, Porto, Portugal, 3–7 November, 2009, pp. 1033–1038Google Scholar
- 4.C.B. Gibbons, Coupling misalignment forces. Proceedings of the 5th Turbo Machinery Symposium, Gas Turbine Laboratory, Texas A&M University, Texas, 1976, pp. 111–116Google Scholar
- 11.J.R. Mancuso, C.B. Gibbons, R.E. Munyon, The application of flexible couplings for turbo machinery, Proceedings of the Eighth Turbo machinery Symposium, Gas Turbine Laboratories, Texas A & M University, 1990, pp. 141–164Google Scholar
- 12.J. Mancuso, General purpose vs. special purpose couplings. Proceedings of the Fifth Turbo machinery Symposium, Gas Turbine Laboratories, Texas A & M University, 1995, pp. 167–177Google Scholar
- 13.I. Redmond, Shaft misalignment and vibration-A model. Proceedings of the Society for Experimental Mechanics, 19–22 February, 2007Google Scholar
- 16.R.M. Rosenberg, On the dynamical behavior of rotating shafts driven by universal (Hooke) coupling. J. Appl. Mech. 25, 47–51 (1958)Google Scholar
- 17.S. Sarkar, A. Nandi, S. Neogy, J.K. Dutta, T.K. Kundra, Finite element analysis of misaligned rotors on oil-film bearings. Indian Acad. Sci. 35, 45–61 (2010)Google Scholar
- 18.V. Hariharan, P.S.S. Srinivasan, Vibration analysis of misaligned shaft–ball bearing system. Indian J. Sci. Technol. 2, 45–50 (2009)Google Scholar
- 22.A.K. Verma, S. Sarangi, M. Kolekar, S. Banerjee, Oil whip detection using stator current monitoring. IEEE Symposium on Computers and Informatics, Penang, Malaysia, 18–20 March, 2012, pp. 119–124Google Scholar
- 23.A.K. Verma, S. Sarangi, M. Kolekar, Shaft misalignment detection using stator current monitoring. Int. J. Adv. Comput. Res. 3, 305–309 (2013)Google Scholar