Abstract
In this paper, an intelligent fault diagnosis system based on instantaneous power spectrum analysis is proposed. The instantaneous noise variations and sensor off-sets are considered to be one of the common factors that yield erroneous fault tracking in an online condition monitoring and fault diagnosis system. The developed system has the capability to detect bearing inner race defects at incipient stages with in an arbitrary noise conditions. An adaptive threshold has been designed to deal with line current noise ambiguities for decision-making on the existence of small fault signatures. The performance of the developed system has been analyzed theoretically and experimentally on a custom designed test rig under various loading conditions of the motor.
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Abbreviations
- ANN:
-
Artificial neural network
- CM:
-
Condition monitoring
- DSP:
-
Digital signal processing
- DAQ:
-
Data acquisition
- IPA:
-
Instantaneous power analysis
- IM:
-
Induction motors
- MCSA:
-
Motor current signature analysis
- PVA:
-
Park vector analysis
- USB:
-
Upper side band
- LSB:
-
Lower side band
- EPRI:
-
Electric power research institute
- FFT:
-
Fast Fourier transform
- RPM:
-
Revolution per mintue
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Acknowledgments
The authors acknowledge the support from the Universiti Teknologi PETRONAS and Ministry of Higher Education (MOHE) Malaysia for the award of the Exploratory Research Grant Scheme (ERGS /1/2012/TK02/UTP/02/09).
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Appendix
Appendix
The Q-function defined in Eq. (14) [42, 45] is used to measure the error probability of wrong detection.
Where:
Figure 9 shows the probability distribution curve of the signature amplitude and noise (assuming an additive zero mean Gaussian noise channel). The area under each probability curve is one. There could be two possible errors in decision making of small signal detection. One type of error is miss-detection which is the shaded area on the left side of chosen arbitrary threshold (\(\gamma _a )\). The second type of error is wrong detection which is the shaded area on the right side of chosen arbitrary threshold (\(\gamma _a )\). The reliability of small signal detection mainly depends on how the second type of error (wrong detection) is suppressed.
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Irfan, M., Saad, N., Ibrahim, R. et al. An Intelligent Fault Diagnosis of Induction Motors in an Arbitrary Noisy Environment. J Nondestruct Eval 35, 12 (2016). https://doi.org/10.1007/s10921-015-0327-3
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DOI: https://doi.org/10.1007/s10921-015-0327-3