Time reversal localization of continuous and burst acoustic emission under noise background

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F17%3A00484034" target="_blank" >RIV/61388998:_____/17:00484034 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Time reversal localization of continuous and burst acoustic emission under noise background

Popis výsledku v původním jazyce

Time reversal (TR) processing of acoustic and ultrasonic signals becomes very effective tool for complicated problems solution in many fields of NDT/E and SHM. TR enables wave focusing in time and space and then location and partial reconstruction of acoustic emission (AE) sources in complex structures. However, the burst AE e.g. from cracks is often completely buried in a high background structural noise. Example of that may be cracking in pipes with streaming or leaking out fluid medium, which is detected as continuous AE. In such situation is location of burst AE and/or leaks extremely difficult. TR is used to enhance signalnto noise ratio (S/N)and to suppress unwanted disturbing background noise. It allows localization of both continuous and burst signal sources at TR focus. In this paper we used TR to localize point-like bounded leakage source and localize burst source buried in leakage noise background. New TR localization procedure is illustrated using artificial AE sources on a steel plate: a) Continuous AE source simulated by sampled leakage noise is precisely located using only two transducers and cross-correlation of TR signals, and b) burst AE events simulated by pen-test are localized under high leakage noise with only one transducer on the plate. Experimental results show new possibilities of TR signal processing in practical engineering applications.

Název v anglickém jazyce

Time reversal localization of continuous and burst acoustic emission under noise background

Popis výsledku anglicky

Time reversal (TR) processing of acoustic and ultrasonic signals becomes very effective tool for complicated problems solution in many fields of NDT/E and SHM. TR enables wave focusing in time and space and then location and partial reconstruction of acoustic emission (AE) sources in complex structures. However, the burst AE e.g. from cracks is often completely buried in a high background structural noise. Example of that may be cracking in pipes with streaming or leaking out fluid medium, which is detected as continuous AE. In such situation is location of burst AE and/or leaks extremely difficult. TR is used to enhance signalnto noise ratio (S/N)and to suppress unwanted disturbing background noise. It allows localization of both continuous and burst signal sources at TR focus. In this paper we used TR to localize point-like bounded leakage source and localize burst source buried in leakage noise background. New TR localization procedure is illustrated using artificial AE sources on a steel plate: a) Continuous AE source simulated by sampled leakage noise is precisely located using only two transducers and cross-correlation of TR signals, and b) burst AE events simulated by pen-test are localized under high leakage noise with only one transducer on the plate. Experimental results show new possibilities of TR signal processing in practical engineering applications.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10307 - Acoustics

Projekt

<a href="/cs/project/GA17-22615S" target="_blank" >GA17-22615S: Využití časové reverzace ultrazvukových signálů v nedestruktivním hodnocení materiálů a konstrukcí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Application of contemporary non-destructive testing in engineering

ISBN

978-961-93537-2-1

ISSN

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e-ISSN

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Počet stran výsledku

11

Strana od-do

3-13

Název nakladatele

Slovenian Society for Non-Destructive Testing

Místo vydání

Ljubljana, Slovenia

Místo konání akce

St. Bernardin / Portorož

Datum konání akce

4. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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