Continuous acoustic emission source location in pipeline using time reversal signal processing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00519749" target="_blank" >RIV/61388998:_____/19:00519749 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Continuous acoustic emission source location in pipeline using time reversal signal processing

Original language description

Reliable location of Acoustic Emission (AE) sources is one of the most important inverse problems in non-destructive testing (NDT) and structural health monitoring (SHM) of engineering structures.nStandard AE source localization procedures often fail at more complicated structures with wave dispersion, velocity or geometry changes, etc. Localization of continuous AE signals generated bynleakage, i.e. random noise is much more difficult than that of short burst signal sources. Eeffective tool for all such situations is time reversal (TR) signal processing [1], which results in space - timenwave focusing, partial source signal reconstruction and more precise source location than other used techniques (up to 1 mm). After artificial AE source location tests on various plates, reported inn[1], we applied TR technique on large steam pipeline (4140 x 245 x 37.5 mm) and small pressure vessels to prove its practical use under real industrial conditions. Leakages were simulated withnrandom noise signals emitted by piezoelectric transducers. AE signals were recorded during the real leaks on power plant. Those signals were overlapped with other more intensive signals reproducingnreal large background noise on power plant (water flow in the pipe). Noise mixture was detected by AE transducers mounted on 1m long waveguides welded to the tested structure. Long signals from two transducers were recorded, time reversed and rebroadcast to the structure using reciprocal TR method. Maximum of their cross-correlation denotes the leakage source on structure surface. Morendetailed surface scanning around roughly pre-localized source was necessary to precise localization. Scanning can be realized e.g. by scanning laser interferometer or numerically in a perfect computer model of the structure.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20501 - Materials engineering

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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