Journal
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
Volume 44, Issue -, Pages 255-262Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jlp.2016.09.021
Keywords
Non-dispersive; Single mode extraction; Leak location; Gas pipelines
Categories
Funding
- Natural Science Foundation Project of CQ CSTC [cstc2015jcyjA40010]
- Science and Technology Research Project of Chongqing education committee [kj1500423]
- PhD Launch Scientific Research projects of Chongqing University of Posts and Telecommunications [A2015-13]
- Youth scientific research projects of Chongqing University of Posts and Telecommunications [A2015-66]
- Natural Science Foundation Project of China [51605065]
Ask authors/readers for more resources
The gas-leak-induced acoustic emission propagates along the pipe wall as a multimodal guided wave. Different modes possess variable propagation velocities and different degrees of dispersion. Thus if the cross correlation of full leak acoustic signals are used to locate a leakage, the location error is inevitably large. It will reduce the detection uncertainty and location error if using a single non-dispersive mode for leak location. The single-mode component in the cross spectrum of a leak acoustic emission can be extracted by applying the weighing window with parameters in terms of the wavenumber of a special mode. The cross spectrum of single-mode guided wave is then inversely Fourier-transformed to obtain the single-mode cross-correlation for estimating the time delay. This way, the more accurate acoustic velocity of a single mode can be used for locating a suspected gas leakage. The experimental results indicate that, for a gas pipeline, compared with the leak location by correlating the undecomposed leak acoustic emission, the average relative leak location errors are reduced by more than 7% at a distance of more than 80 m due to the enhancement of correlativity of a single mode in leak acoustic emission and the adoption of a more accurate acoustic velocity. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available