Journal ArticleDOI
Detection of leak acoustic signal in buried gas pipe based on the time―frequency analysis
Min-Soo Kim,Sang-Kwon Lee +1 more
TLDR
In this paper, the authors identify the characteristics of dispersive acoustic wave through analysis of the cut-off frequency by using the time-frequency method experimentally and BEM theoretically for the development of an experimental tool to analyze the leak signals in steel pipe.Abstract:
A time–frequency technique for locating leaks in buried gas distribution pipes involves the use of the cross-correlation on two measured acoustic signals on either side of a leak. This technique can be problematic for locating leaks in steel pipes, as the acoustic signals in these pipes are generally narrow-band and low frequency. The effectiveness of the time–frequency technique for detecting leaks in steel pipes was investigated experimentally in an earlier study. The object of this paper is to identify the characteristics of this dispersive acoustic wave through analysis of the cut-off frequency by using the time–frequency method experimentally and BEM (boundary element method) theoretically for the development of an experimental tool to analyze the leak signals in steel pipe. The tool is based on experimental work and theoretical formulation of wave propagation in a fluid-filled pipe. This tool uses the time–frequency method to explain some of the features of wave propagation measurements made in gas pipes. Leak noise signals are generally passed through a time–frequency filter for detection of impulse signal related leakage.read more
Citations
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Journal ArticleDOI
A survey on gas leak detection and localization techniques
Pal-Stefan Murvay,Ioan Silea +1 more
TL;DR: This paper identifies the state-of-the-art in leak detection and localization methods and evaluates the capabilities of these techniques in order to identify the advantages and disadvantages of using each leak detection solution.
Journal ArticleDOI
Recent Advances in Pipeline Monitoring and Oil Leakage Detection Technologies: Principles and Approaches
TL;DR: This paper discusses pipeline leakage detection technologies and summarises the state-of-the-art achievements, and compares performance analysis is performed to provide a guide in determining which leak detection method is appropriate for particular operating settings.
Journal ArticleDOI
Experimental study on leak detection and location for gas pipeline based on acoustic method
TL;DR: It is proved that the disturbing signals can be efficiently removed by the analysis of time and frequency domain, while the new characteristics of the accumulative value difference, mean value difference and peak value difference of signals in adjacent intervals can detect the leak effectively and decrease the false alarm rate significantly.
Journal ArticleDOI
Leak detection of pipeline
TL;DR: A novel leak detection scheme based on rough set theory and support vector machine (SVM) is proposed to overcome the problem of false leak detection and uses swarm intelligence technique: artificial bee colony (ABC) algorithm, which imitates intelligent food searching behavior of honey bees.
Journal ArticleDOI
Towards Achieving a Reliable Leakage Detection and Localization Algorithm for Application in Water Piping Networks: An Overview
TL;DR: It is concluded that despite the numerous research efforts and advancement in leakage detection technologies, a large scope is still open for further research in this domain and the effective detection of background type leakages that have not been covered fully in the literature are addressed.
References
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Book
Fundamentals of acoustics
TL;DR: In this article, the authors present a two-dimensional wave equation and simple solutions for the wave equation with respect to the two dimensions of the wave and the two types of vibrations.
Journal ArticleDOI
Characteristics of wave propagation and energy distributions in cylindrical elastic shells filled with fluid
Chris R. Fuller,Frank Fahy +1 more
TL;DR: In this article, the dispersion behavior and energy distributions of free waves in thin walled cylindrical elastic shells filled with fluid are investigated, and a non-dimensional equation which determines the distribution of vibrational energy between the shell wall and the contained fluid is derived.
Book
Fundamentals of Acoustic Field Theory and Space-Time Signal Processing
TL;DR: In this paper, the authors propose a solution of the Linear Three-Dimensional Inhomogeneous Wave Equation with Arbitrary Source Distribution in the Cylindrical Coordinate System.
Journal ArticleDOI
On the selection of acoustic/vibration sensors for leak detection in plastic water pipes
TL;DR: In this article, the authors investigated the behavior of the cross-correlation coefficient for leak signals measured using pressure, velocity and acceleration sensors and showed that a measure of pressure responses using hydrophones is effective for measurements where there is a small signal-to-noise ratio (SNR), but a sharper peak correlation coefficient can be achieved if accelerometers are used.
Journal ArticleDOI
Higher order mode effects in circular ducts and expansion chambers
TL;DR: In this paper, the theory of higher order modes in circular ducts is reviewed and applied to expansion chambers, and cutoff frequencies for these various modes are discussed with respect to propagation in an expansion chamber.