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

Result code in 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>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10307 - Acoustics

Project

<a href="/en/project/GA17-22615S" target="_blank" >GA17-22615S: Time reversal ultrasonic signal processing used in nondestructive evaluation of materials and structures</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Article name in the collection

Application of contemporary non-destructive testing in engineering

ISBN

978-961-93537-2-1

ISSN

—

e-ISSN

—

Number of pages

11

Pages from-to

3-13

Publisher name

Slovenian Society for Non-Destructive Testing

Place of publication

Ljubljana, Slovenia

Event location

St. Bernardin / Portorož

Event date

Sep 4, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—