A phase linearisation–based modulation signal bispectrum for analysing cyclostationary bearing signals

Yuandong Xu, Chao Fu, Ning Hu, Baoshan Huang, Fengshou Gu, Andrew D. Ball

Research output: Contribution to journalArticlepeer-review


Bearings are used as the most important load-carrying transmission components in various machines, thus subjecting to a number of faults including wear, fatigue pitting, cracks and so on. Fault detection and diagnosis of bearings can effectively prevent the machine from such typical failures and subsequent consequences. The faults in bearings can lead to the vibration signals that exhibit cyclostationary characteristics due to the inevitably random phase noise (or slippage between bearing components). In this article, a phase linearisation–based modulation signal bispectrum is proposed to tune up the cyclostationary bearing signal into a periodic waveform by linearizing the instantaneous phase of the narrow frequency band signals. In this way, the signal becomes more deterministic and modulation signal bispectrum can be effectively applied to suppression noise and obtain accurate and robust diagnosis results. As a result, this fault detector can achieve high performance in characterising the nonstationary bearing vibration signals and hence diagnose the bearing faults even in the case of extremely low signal-to-noise ratio (<−20 dB), which is benchmarked by the method of conventional modulation signal bispectrum in both simulation and experiment studies.

Original languageEnglish
Number of pages16
JournalStructural Health Monitoring
Early online date23 Aug 2020
Publication statusE-pub ahead of print - 23 Aug 2020

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