&nbsp; Acoustic monitoring and signal feature extraction for valve internal leakage

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 120-126.

Acoustic monitoring and signal feature extraction for valve internal leakage

LIN Wei-guo WU Shi-en

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Abstract

A non-intrusive acoustic monitoring method for valve internal leakage was proposed using a dual-sensor structure. The sensing device was designed to be able to adjust contact level between sensor and pipe wall and lock them, and it could be loaded and unloaded quickly. The time-frequency domain features of interference acoustic signals sampled under the conditions of valve normal state, valve internal leakage, pipe tapping, pump starting during valve being in open or close state were analyzed contrastively. The feature extraction approach based on the wavelet packet energy ratio for valve internal leakage acoustic signals was proposed. It was shown that this method can effectively distinguish valve internal leakage and external interferences; it has a higher leakage detection sensitivity, it can greatly reduce the sampling frequency and the difficulty degree of valve internal leakage diagnosis.

Key words

Key words: valve internal leakage / dual-sensor structure / non-intrusive acoustic monitoring / quick load and unload / wavelet packet energy ratio

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LIN Wei-guo WU Shi-en. Acoustic monitoring and signal feature extraction for valve internal leakage[J]. Journal of Vibration and Shock, 2018, 37(9): 120-126

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