Application of iterative generalized short-time Fourier transform to fault diagnosis of planetary gearboxes

ZHANG Dong; FENG Zhi-peng

doi:10.13374/j.issn2095-9389.2017.04.016

Volume 39 Issue 4

Apr. 2017

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ZHANG Dong, FENG Zhi-peng. Application of iterative generalized short-time Fourier transform to fault diagnosis of planetary gearboxes[J]. Chinese Journal of Engineering, 2017, 39(4): 604-610. doi: 10.13374/j.issn2095-9389.2017.04.016

Citation:

ZHANG Dong, FENG Zhi-peng. Application of iterative generalized short-time Fourier transform to fault diagnosis of planetary gearboxes[J]. Chinese Journal of Engineering, 2017, 39(4): 604-610. doi: 10.13374/j.issn2095-9389.2017.04.016

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Application of iterative generalized short-time Fourier transform to fault diagnosis of planetary gearboxes

doi: 10.13374/j.issn2095-9389.2017.04.016

ZHANG Dong,
FENG Zhi-peng^,

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2016-06-20

Abstract

Abstract

Due to the effect of the modulation part, the energy diffuses around the surrounding area of dominating frequencies and diminishes the readability of the time-frequency representation when short-time Fourier transform (STFT) is used to process nonstationary signals. However, when the instantaneous frequency slowly changes or is constant, the effect is small and can even be neglected. Thus, the time-frequency representations have high-energy concentration. Based on this feature, a novel method called iterative generalized short-time Fourier transform (IG-STFT) was proposed, which improved the readability of the time-frequency representation. First, the stationary mono-components are separated using iterative generalized demodulation. Then, the time-frequency representations of each mono-component are acquired using STFT. Finally, the time-frequency representation of the original signal is obtained according to the analysis results of STFT and the phase function. The analysis results of a planetary gearbox simulation signal and experimental signals verify the effectiveness of this method for analyzing nonstationary signals and diagnosing gear faults.
- fault diagnosis,
- planetary gearbox,
- Fourier transform,
- generalized demodulation,
- nonstationary signal

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References(12)

References

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