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On the signum function and its effect on acoustic correlation for leak location in buried plastic water pipes

On the signum function and its effect on acoustic correlation for leak location in buried plastic water pipes
On the signum function and its effect on acoustic correlation for leak location in buried plastic water pipes
the recent problem faced by São Paulo State in Brazil. Although older metallic pipes are now being replaced by plastic pipes they still suffer from leakage. Unfortunately, correlation techniques, which are used to locate leaks by correlating signals from two vibration sensors attached to the pipe, are less effective in plastic pipes because of higher leak noise attenuation. Hence, the gain setting of the sensorsused to collect leak signals haveto be carefully selected to enhance the effectiveness of correlation techniques when applied to plastic pipes. However, this is not simple in practical situations, so that the acquired data can become saturated (clipped) or be very small. This paper describes the effects of clipping on the estimation of time delay by severely distorting the signals by using the signum function. It transpires, that although this adds some noise to the original signals, and potentially reduces the bandwidth of which there are measurable leak noise signals, it does not have a profound effect on time delay estimation and hence the accuracy of the leak location. Leak noise signals measured in controlled conditions on a bespoke test-rig constructed by South Staffs Water plc, are used to demonstrate how this process works.
1344-1349
Almeida, F.C.L.
f3e961f9-05ea-49cd-aa82-20e421de7b8c
Brennan, M.J.
7360b0b3-16af-4bfa-9e93-698324ace52c
Paschoalini, A.T.
bfa1fed9-f566-4380-807a-2c53e01b6627
Joseph, P.F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Gao, Y.
e46455ac-b265-4982-b2f5-4024d386504e
Almeida, F.C.L., Brennan, M.J., Paschoalini, A.T., Joseph, P.F. and Gao, Y. (2017) On the signum function and its effect on acoustic correlation for leak location in buried plastic water pipes Procedia Engineering, 199, pp. 1344-1349.

Almeida, F.C.L., Brennan, M.J., Paschoalini, A.T., Joseph, P.F. and Gao, Y. (2017) On the signum function and its effect on acoustic correlation for leak location in buried plastic water pipes Procedia Engineering, 199, pp. 1344-1349.

Record type: Article

Abstract

the recent problem faced by São Paulo State in Brazil. Although older metallic pipes are now being replaced by plastic pipes they still suffer from leakage. Unfortunately, correlation techniques, which are used to locate leaks by correlating signals from two vibration sensors attached to the pipe, are less effective in plastic pipes because of higher leak noise attenuation. Hence, the gain setting of the sensorsused to collect leak signals haveto be carefully selected to enhance the effectiveness of correlation techniques when applied to plastic pipes. However, this is not simple in practical situations, so that the acquired data can become saturated (clipped) or be very small. This paper describes the effects of clipping on the estimation of time delay by severely distorting the signals by using the signum function. It transpires, that although this adds some noise to the original signals, and potentially reduces the bandwidth of which there are measurable leak noise signals, it does not have a profound effect on time delay estimation and hence the accuracy of the leak location. Leak noise signals measured in controlled conditions on a bespoke test-rig constructed by South Staffs Water plc, are used to demonstrate how this process works.

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Accepted/In Press date: 1 September 2017
e-pub ahead of print date: 12 September 2017
Published date: 2017
Venue - Dates: EURODYN 2017: X International Conference on Structural Dynamics, Rome, Italy, 2017-09-10 - 2017-09-13

Identifiers

Local EPrints ID: 415064
URI: http://eprints.soton.ac.uk/id/eprint/415064
PURE UUID: b9b14a6a-7352-4bef-aeff-04b6c29c3d65

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Date deposited: 25 Oct 2017 16:30
Last modified: 31 Oct 2017 18:44

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Contributors

Author: F.C.L. Almeida
Author: M.J. Brennan
Author: A.T. Paschoalini
Author: P.F. Joseph
Author: Y. Gao

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