The Demodulating Principle of Autocorrelation-Envelope and its Application to Gearbox Diagnosis

Abstract:

As the most important transmission system of vehicles, the gearbox has a high fault rate, so it is meaningful to evaluate and diagnose its health condition and faults accurately. Autocorrelation -envelope analysis is a fault diagnosis method that can suppress the noise and reserve the periodic components of vibration signals. A conclusion has been deduced: amplitude modulated, frequency modulated, or amplitude& frequency modulated signals can be transformed into amplitude modulated signals with the same modulation frequency through autocorrelation processing. Therefore, the aucorrelation-envelope technique is suitable for extracting the fault features of gearbox from its vibration signal with the coexistence of amplitude modulation and frequency modulation. The simulation results verify the validity of the conclusion and the experiment of vehicle gearbox diagnosis indicates the effectiveness of this method.

• Periodical: Applied Mechanics and Materials (Volumes 380-384)
• Pages: 1029-1034
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.380-384.1029
• Online since: August 2013
• Authors: Zhan Dong Bi, Yong Chen, Zhi Zhao Peng, Yu Zhang
• Keywords: Autocorrelation, Demodulation, Envelope, Fault Diagnosis, Gearbox

References

[1] J. Antoni, R. B. Randall, Differential Diagnosis of Gear and Bearing Faults [J]. Journal of Vibration and Acoustics, April, 2002, Vol. 124: 165-171.

DOI: 10.1115/1.1456906

[2] LIN Jing, LIU HongXing, QU LiangSheng. Envelope characteristic recognition and its application in mechanical fault diagnosis [J]. Journal of Vibration, Measurement & Diagnosis, 1998, 11(8): 34-38(In Chinese).

[3] HU GuangShu. Digital signal processing [M]. 2nd ed. Beijing: Tsinghua University Press, 2003: 33-39; 2003: 496-499(In Chinese).

[4] SUN Hui, ZHU ShanAn. Hilbert-Huang transform demodulation based on delayed autocorrelation pretreatment [J]. Journal of Zhejiang University: Engineering Science Edition, 2005, 30(2): 1998-2001(In Chinese).

[5] MENG Tao, LIAO MingFu, LI Hui. Detection and diagnosis of the gear fault by the delayed correlation envelope technique [J]. Journal of Aerospace Power, 2003, 18(1): 109-113(In Chinese).

[6] HE Wei, JIANG ZhiNong. Frequency demodulation based on delayed autocorrelation and its application in gear fault diagnosis [J]. Journal of Vibration and Shock, 2009, 28(9): 195-199(In Chinese).

[7] Andrews G, Askey R, Roy R. Special functions [M]. Beijing: Tsinghua University Press, 2004: 187-234.