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Comparative study of time delay estimators for steady-state and transient acoustic leak signals

Comparative study of time delay estimators for steady-state and transient acoustic leak signals
Comparative study of time delay estimators for steady-state and transient acoustic leak signals
The effectiveness of leak detection in water pipes using acoustic methods is partly determined by how accurately the time delay between the leak signals is estimated. This comparative study of correlation-, error-, and wavelet-based time delay estimators using simulated and real steady-state and transient leak signals shows that while these estimators perform well at high signal-to-noise ratio (SNR), their performance degrades at low SNR. They are more effective for estimating delays in steady-state signals, although wavelet-based methods also perform well for transient signals. The effectiveness of wavelet-based methods depends primarily on the scale or decomposition level, rather than on the type of wavelet used. The results of this study also shows that an accurate time delay estimate can be obtained directly in the frequency domain from the unwrapped cross-spectral phase; however, this method requires the exclusion of additional phase shifts caused by resonances and reflections in order to improve accuracy.
ISMA Publications
Uchendu, Ndubuisi
4d00be49-162b-4d25-b4cf-b253f06b567c
Muggleton, Jennifer
2298700d-8ec7-4241-828a-1a1c5c36ecb5
Rustighi, Emiliano
9544ced4-5057-4491-a45c-643873dfed96
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Uchendu, Ndubuisi
4d00be49-162b-4d25-b4cf-b253f06b567c
Muggleton, Jennifer
2298700d-8ec7-4241-828a-1a1c5c36ecb5
Rustighi, Emiliano
9544ced4-5057-4491-a45c-643873dfed96
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba

Uchendu, Ndubuisi, Muggleton, Jennifer, Rustighi, Emiliano and White, Paul (2020) Comparative study of time delay estimators for steady-state and transient acoustic leak signals. In ISMA-USD Noise and Vibration Engineering Conference 2020. ISMA Publications..

Record type: Conference or Workshop Item (Paper)

Abstract

The effectiveness of leak detection in water pipes using acoustic methods is partly determined by how accurately the time delay between the leak signals is estimated. This comparative study of correlation-, error-, and wavelet-based time delay estimators using simulated and real steady-state and transient leak signals shows that while these estimators perform well at high signal-to-noise ratio (SNR), their performance degrades at low SNR. They are more effective for estimating delays in steady-state signals, although wavelet-based methods also perform well for transient signals. The effectiveness of wavelet-based methods depends primarily on the scale or decomposition level, rather than on the type of wavelet used. The results of this study also shows that an accurate time delay estimate can be obtained directly in the frequency domain from the unwrapped cross-spectral phase; however, this method requires the exclusion of additional phase shifts caused by resonances and reflections in order to improve accuracy.

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Published date: 7 September 2020

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Local EPrints ID: 445645
URI: http://eprints.soton.ac.uk/id/eprint/445645
PURE UUID: baff962b-ca1e-4f3a-9f40-6220abeda353
ORCID for Ndubuisi Uchendu: ORCID iD orcid.org/0000-0002-4199-5839
ORCID for Emiliano Rustighi: ORCID iD orcid.org/0000-0001-9871-7795
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713

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Date deposited: 05 Jan 2021 17:31
Last modified: 18 Feb 2021 17:38

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