NUMERICAL COMPUTATIONS LEADING TO LOCALIZATION OF ACOUSTIC EMISSION USING GEODESIC CURVES

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F17%3A00315498" target="_blank" >RIV/68407700:21340/17:00315498 - 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
NUMERICAL COMPUTATIONS LEADING TO LOCALIZATION OF ACOUSTIC EMISSION USING GEODESIC CURVES
Original language description
We deal with the exact model of localization of acoustic emission (AE) sources on real complex solid bodies. Our approach is based on numerical computations of precise geodesic curves on 3D vessels which can be composed from several parametrized surfaces with multiple intersec-tions. Instead of solving the geodesic differential equations under specific Christoffel symbols, we compute our geodesics numerically by Finite Difference, Newton–Raphson, and Fixed Point Iteration methods. For faster calculations we propose technical improvements and optimiza-tions. We also consider the case when the surface contains the holes, i.e. the exact geodesic curve has to bypass a given obstacles. These techniques are used in real experiment on the galvanized steel watering can that represents a vessel with higher geometrical complexity. The layout of piezoelectric acoustic emission sensors supposes that the main part of the body can be inaccessible due to high temperature or radioactivity, such as in the case of nuclear power station health monitoring. Finally, we present the results of AE localization principle using length (or time) differences measured by means of geodesics found on the watering can while minimizing its distinctions from the real time differences measured.
Czech name
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Czech description
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Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
NDT in PROGRESS, IXth International Workshop of NDT Experts, Proceedings
ISBN
978-80-87012-63-5
ISSN
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e-ISSN
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Number of pages
10
Pages from-to
16-25
Publisher name
Institute of Thermomechanics, AS CR, v.v.i.
Place of publication
Prague
Event location
Prague
Event date
Oct 9, 2017
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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