Contouring Geodetically Accurate Acoustic Emission Sources via Kernel Density Estimates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F19%3A00326201" target="_blank" >RIV/68407700:21340/19:00326201 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.ndt.net/?id=23596" target="_blank" >https://www.ndt.net/?id=23596</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Contouring Geodetically Accurate Acoustic Emission Sources via Kernel Density Estimates

Popis výsledku v původním jazyce

We deal with numerical model of localization of acoustic emission (AE) sources on real complex solid bodies. Our approach is based on exact geodesic curves on 3D vessels composed of several parametrized surfaces. The numerical computations are provided via Finite difference, Newton–Raphson, and Fixed-point iteration methods applied to geodesic equations acquired from differential geometry theory. To speed up computations, some technical improvements and optimizations are proposed. The variable propagation velocity and also the case when the geodesic curve has to bypass a given obstacle there is also included into the model. These techniques are employed in the real experimental setup on bodies with higher geometrical complexity. The results (localization maps) of AE localization principle using length (ΔL) or time (ΔT) differences, obtained by means of geodesics, are then processed through the two-dimensional Kernel probability density estimates executed directly on the 3-D surfaces, which give us the most probable areas of the AE source positions on the main body. The placement of piezo-ceramic AE sensors is outside the central part of the vessel because it can be inaccessible due to possible high temperature or radioactivity, such as in the case of nuclear power station health monitoring. This outward position of all AE sensors can result in a dispersed AE wave detected, or attenuated because of welded intersections of different surfaces. Thus, the Change-point analysis of AE signals is also discussed in order to obtain the most precise arrival times of AE events, which is crucial for ΔT / ΔL localization.

Název v anglickém jazyce

Contouring Geodetically Accurate Acoustic Emission Sources via Kernel Density Estimates

Popis výsledku anglicky

We deal with numerical model of localization of acoustic emission (AE) sources on real complex solid bodies. Our approach is based on exact geodesic curves on 3D vessels composed of several parametrized surfaces. The numerical computations are provided via Finite difference, Newton–Raphson, and Fixed-point iteration methods applied to geodesic equations acquired from differential geometry theory. To speed up computations, some technical improvements and optimizations are proposed. The variable propagation velocity and also the case when the geodesic curve has to bypass a given obstacle there is also included into the model. These techniques are employed in the real experimental setup on bodies with higher geometrical complexity. The results (localization maps) of AE localization principle using length (ΔL) or time (ΔT) differences, obtained by means of geodesics, are then processed through the two-dimensional Kernel probability density estimates executed directly on the 3-D surfaces, which give us the most probable areas of the AE source positions on the main body. The placement of piezo-ceramic AE sensors is outside the central part of the vessel because it can be inaccessible due to possible high temperature or radioactivity, such as in the case of nuclear power station health monitoring. This outward position of all AE sensors can result in a dispersed AE wave detected, or attenuated because of welded intersections of different surfaces. Thus, the Change-point analysis of AE signals is also discussed in order to obtain the most precise arrival times of AE events, which is crucial for ΔT / ΔL localization.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

<a href="/cs/project/LM2015068" target="_blank" >LM2015068: Výzkumná infrastruktura pro experimenty ve Fermilab</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

e-Journal of NDT

ISSN

1435-4934

e-ISSN

1435-4934

Svazek periodika

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Číslo periodika v rámci svazku

January

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

7

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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