Simplified dispersion relationships for fluid-dominated axisymmetric wave motion in buried fluid-filled pipes

Gao, Yan; Sui, Fan; Muggleton, J.M.; Yang, Jun

doi:10.1016/j.jsv.2016.04.012

Cited by 53 publications

(60 citation statements)

References 25 publications

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“…Note that these are taken to be constants. Recent work by Gao et al [14,15] has shown that for plastic water pipes, the presence of the surrounding soil increases both the propagation wavespeed and attenuation with frequency compared to the invacuo case. However, they may be assumed to be constant for the purposes of this paper, because in the experimental work leak noise signals are confined to low frequencies.…”

Section: Discussionmentioning

confidence: 99%

Improving the shape of the cross-correlation function for leak detection in a plastic water distribution pipe using acoustic signals

et al. 2017

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a b s t r a c tThis paper is concerned with time delay estimation for the detection of leaks in buried plastic water pipes using the cross-correlation of leak noise signals. In some circumstances the bandwidth of over which the signal analysis can be conducted is severely restricted because of resonances in the pipe system, which manifest themselves as peaks in the modulus of the power spectral and cross spectral densities, and deviations from straight-line behaviour in the phase of the cross spectral density. The result can be a crosscorrelation function in which it is difficult to estimate the time delay accurately. This paper describes a procedure in which the shape of the cross-correlation function can be significantly improved, resulting in an unambiguous and clear estimate of the time delay. The frequency response function(s) of the resonator(s) responsible for the resonance effects are first determined and then the data is processed using the model(s) of the resonators to remove these effects. This enables more signal processing to be conducted, potentially over a much wider bandwidth, further improving the shape of the cross-correlation function. The process is illustrated in this paper using hydrophone measured data at a leak detection facility. The current limitation in the process is that it is carried out manually, which could potentially restrict its application in practical acoustic correlators. The challenge now is to develop an algorithm to carry out the procedure automatically.

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Section: Discussionmentioning

confidence: 99%

Improving the shape of the cross-correlation function for leak detection in a plastic water distribution pipe using acoustic signals

et al. 2017

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“…Previous studies have shown that the vibroacoustics technique can be adopted to locate the leakage in buried pipelines through measurements using acoustic/vibration sensors either installed along the pipeline or on the ground surface due to the dispersion and radiation characteristics of leakage signals [4][5][6][7][8][9][10][11][12][13][14]. Moreover, the principle of interior detection is based on leak noise propagation in a tube: a microphone is mounted within a sphere that runs with the water flowing in the pipe [15]; when the sphere moves to the vicinity of the leakage point, the acoustic signal collected by the sensor will increase rapidly, resulting in larger signal amplitude when the distance between them gets shorter.…”

Section: Introductionmentioning

confidence: 99%

On Image Fusion of Ground Surface Vibration for Mapping and Locating Underground Pipeline Leakage: An Experimental Investigation

Yan

Yuan

Gao

et al. 2020

Sensors

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This paper is concerned with imaging techniques for mapping and locating underground pipeline leakage. Ground surface vibrations induced by the propagating axisymmetric wave can be measured by an array of acoustic/vibration sensors, with the extraction of magnitude information used to determine the position of leak source. A method of connected graph traversal is incorporated into the vibroacoustic technique to obtain the spatial image with better accuracy compared to the conventional magnitude contour plot. Measurements are made on a dedicated cast iron water pipe by an array of seven triaxial geophones. The spectral characteristics of the propagation of leak noise signals from underground water pipes to the ground surface are reported. Furthermore, it is demonstrated that suspicious leakage areas can be readily identified by extracting and fusing the feature patterns at low frequencies where leak noise dominates. The results agree well with the real leakage position in the underground pipeline.

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“…The modal was improved by including shear coupling for a buried fluid-fill pipe at a lubricated pipe/soil interface [21]. Gao et al [22] proposed a simplified analytical model to predict the dispersion relationships for fluid-dominated wave and investigated structural and fluid motion [23] in buried fluid-fill pipes, which provides theoretical support for axisymmetric wave propagation in buried fluid-filled pipe systems with perfect bonding in pipe-soil interface. For the water pipe, where the inner fluid and the pipe wall are well coupled, the s = 1 wave (water-dominated wave) will be the predominant energy carrier [15] and it can radiate into surrounding soil while propagating down the pipe.…”

Section: Introductionmentioning

confidence: 99%

“…The investigation starts with the fundamental theory of axisymmetric wave motion in a buried pipe system in Section 2. This is based on a simplified analytical model of axisymmetric wave motion in buried fluid-filled pipes [22]. The numerical results are presented in Section 3.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Axisymmetric Wave Propagation in Buried Fluid-Filled Pipes for Optimizing the Vibro-Acoustic Technique When Locating Gas Pipelines

et al. 2019

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Buried pipeline systems play a vital role in energy storage and transportation, especially for fluid energies like water and gas. The ability to locate buried pipes is of great importance since it is fundamental for leakage detection, pipeline maintenance, and pipeline repair. The vibro-acoustic locating method, as one of the most effective detection technologies, has been studied by many researchers. However, previous studies have mainly focused on vibro-acoustic propagation in buried water pipes. Limited research has been conducted on buried gas pipes. In this paper, the behavior of gas-dominated wave motion will be investigated and compared against water-dominated wave motion by adapting an established analytical model of axisymmetric wave motion in buried fluid-filled pipes. Furthermore, displacement profiles in spatial domain resulting from gas-dominated wave in buried gas pipeline systems will be analyzed, and the effects of pipe material, soil property, as well as mode wave type will be discussed in detail. An effective radiation coefficient (ERC) is proposed to measure the effective radiation ability of gas-dominated wave and water-dominated wave. It is observed that the gas-dominated wave in gas pipes cannot radiate into surrounded soil as effectively as water-dominated wave in water pipes because of the weak coupling between gas and pipe-soil. In this case, gas-dominated wave may not be the best choice as the target wave for locating buried gas pipes. Therefore, the soil displacements result from the shell-dominated wave are also investigated and compared with those from gas-dominated wave. The results show that for buried gas pipes, the soil displacements due to radiation of shell-dominated wave are stronger than gas-dominated wave, which differs from buried water pipe. Hence, an effectively exciting shell-dominated wave is beneficial for generating stronger vibration signals and obtaining the location information. The findings of this study provide theoretical insight for optimizing the current vibro-acoustic method when locating buried gas pipes.

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Simplified dispersion relationships for fluid-dominated axisymmetric wave motion in buried fluid-filled pipes

Cited by 53 publications

References 25 publications

Improving the shape of the cross-correlation function for leak detection in a plastic water distribution pipe using acoustic signals

Improving the shape of the cross-correlation function for leak detection in a plastic water distribution pipe using acoustic signals

On Image Fusion of Ground Surface Vibration for Mapping and Locating Underground Pipeline Leakage: An Experimental Investigation

A Numerical Study of Axisymmetric Wave Propagation in Buried Fluid-Filled Pipes for Optimizing the Vibro-Acoustic Technique When Locating Gas Pipelines

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