Abstract
For the fault diagnosis of rotating machinery, the demodulation algorithm of the monitoring signals plays a key role in fault feature extraction. Especially for weak fault features extraction, existing single narrow band demodulation methods have worse performance under low signal to noise ratio condition. According to the mechanism of rotating machinery, both narrow and broad frequency band modulated signals exist simultaneously. Therefore, weak fault features can be obtained through demodulation of multiple narrow frequency bands rather than only one resonance narrow band. In this study, a novel weak feature extraction method is proposed based on used as a good filtermultiple frequency bands demodulation. The superiority of the proposed method is corroborated by simulation analysis and applications of a centrifugal pump and a propeller. By simulation analysis, the proposed multiple frequency bands demodulation (MFBD) method has better demodulation performance than Fast Kurtogram, Autogram and Fast-SC for weak modulation features. The applications results suggested that the proposed MFBD provided a clearer characteristic frequency identification than Fast Kurtogram, Autogram and Fast-SC, especially in weak modulation condition. Therefore, the proposed MFBD method provides a reliable basis for weak fault signal extraction, which shows good engineering significance for fault diagnosis of rotating machinery and passive detection of propeller.
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Acknowledgements
The authors gratefully acknowledge the financial supports of the National Key R&D Plan of China (No. 2016YFF0203300). Authors would like to thank Professor Jéróme Antoni and Ali Moshrefzadeh for sharing the Fast Kurtogram, Autogram and Fast-SC codes publicly.
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Song, Y., Liu, J., Wu, D. et al. The MFBD: a novel weak features extraction method for rotating machinery. J Braz. Soc. Mech. Sci. Eng. 43, 547 (2021). https://doi.org/10.1007/s40430-021-03259-z
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DOI: https://doi.org/10.1007/s40430-021-03259-z