Citation

Yang L, Xie H, Li S, Li W, He M. Yi Qi Yi Biao Xue Bao 2017; 38(4): 969-976.

Copyright

(Copyright © 2017, Ji xie gong ye chu ban she)

DOI

unavailable

PMID

unavailable

Abstract

The correlation-based leak location errors are large due to the multi-modal and dispersive characteristics of leakage-induced acoustic emission. One kind of leak location in the gas pipelines by extracting the single non-dispersive mode is proposed in this study. The cross-power spectrum of the single modal and non-dispersive component in the leak acoustic emission can be obtained by applying the weighing window with parameters of the wave number of the relative mode. Then, the cross-power spectrum of a single modal and non-dispersive component is analyzed by the inverse Fourier-transformed to acquire the cross-correlation for estimating the time delay. Hence, the acoustic velocity of a single modal and non-dispersive component can be used for calculating the leak position more accurately. The experiments of leak location indicate that the relative error is reduced at least 7%. The reason is the enhancement of correlativity of a single modal and non-dispersive component in leak acoustic emission and the adoption of a more accurate acoustic velocity. It shows that the time-delay estimation by extracting the single-modal and non-dispersive component in the cross-power spectrum of leakage-induced acoustic emission signals will enhance the leak detection and location.
Keywords: Pipeline transportation

Language: zh

Keywords

Location; Gas pipelines; Pipelines; Leak detection; Acoustic emission testing; Extraction; Dispersion (waves); Acoustic wave velocity; Power spectrum; Time delay