Improved HHT for four-way valve early fault diagnosis

Qing Jiang; Ting Li; Yan Yao; Jinhui Cai

doi:10.1117/12.885411

31 December 2010 Improved HHT for four-way valve early fault diagnosis

Qing Jiang, Ting Li, Yan Yao, Jinhui Cai

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754437 (2010) https://doi.org/10.1117/12.885411
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

The noise interference and end effect is irritating in the HHT processing of strong noise signals. In view of this situation, an improved HHT method based on the wavelet denoising and wave characteristic matching is proposed. Firstly, according to the analysis of the noise interference in wave characteristic matching extension and HHT itself, the paper adopts the wavelet threshold denoising to make a pretreatment of strong noise signal that can wipe off noise interference effectively. Then, extends and reconstructs data at both ends of signal to restrain end effect during EMD and Hilbert transform with the wave characteristic matching. Lastly, obtains the early fault feature of four-way valve from HHT time-frequency spectrum accurately. Simulation and instances show that the improved HHT method is able to reduce the false components resulted from decomposing useless noise, restrain the end effect, enhance the accuracy and timeliness of HHT, and thus make HHT arithmetic more practical.

Citation Download Citation

Qing Jiang, Ting Li, Yan Yao, and Jinhui Cai "Improved HHT for four-way valve early fault diagnosis", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754437 (31 December 2010); https://doi.org/10.1117/12.885411

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