An Investigation into the Factors Affecting the Bandwidth of Measured Leak Noise in Buried Plastic Water Pipes

Scussel, Oscar; Brennan, M.J.; Almeida, Fabricio; Iwanaga, M.K.; Muggleton, J.M.; Joseph, Phillip; Gao, Yan

doi:10.1007/978-3-031-15758-5_106

Cited by 2 publications

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“…The predicted responses for the parameters given in Tables 3 and 4 are also shown in Figure 8. The experimental measurements have leak noise content within a certain bandwidth because of the band-pass filtering effects of the pipe-surrounding medium-sensor systems and measurement noise [24]. These frequency bands are estimated roughly through the coherence function [37] and are denoted as a shaded area in each case, whose edges are marked with vertical dotted red lines.…”

Section: Resultsmentioning

confidence: 99%

“…This investigation includes both a theoretical analysis, using an analytical model, and analyses of experimental data sets from three different regions around the world to assess the accuracy of the model in estimating the frequency range of the measured leak noise. A concise overview of the main findings of this research has been presented in the proceedings of a conference in [24]. Here, a detailed description of the theory is given in turn, including in-depth discussion towards the key factors affecting the bandwidth of the leak noise.…”

Section: Introductionmentioning

confidence: 99%

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Key Factors That Influence the Frequency Range of Measured Leak Noise in Buried Plastic Water Pipes: Theory and Experiment

et al. 2023

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The frequency range of the leak noise in buried water pipes, measured using acoustic correlators, depends significantly on the type of pipe and its location as well as the type of sensors used. Having a rough idea of this frequency range can be beneficial for operators prior to conducting tests; however, there is currently no method of predicting it except through practical experience, and no model-based approach yet exists. This issue is addressed in the present paper by using a concise and relatively simple analytical model of the water-pipe–soil system combined with the sensors’ frequency response. The influence of the various physical parameters of the system, such as the pipe and soil properties and the sensor type, on the cross-power spectral density (CPSD) of leak noise signals and, furthermore, the frequency range are investigated. The main factors that affect the bandwidth are the distance between the sensors, wave speed of the predominantly fluid-borne wave in the pipe and the attenuation of this wave. It is shown that the external medium has a profound effect on the propagation and, in turn, on the bandwidth. The approach to predicting this bandwidth is validated using experimental data from three different test sites.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%