Contouring Geodetically Accurate Acoustic Emission Sources via Kernel Density Estimates

Result code in 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>

Result on the web

<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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Result language

angličtina

Original language name

Contouring Geodetically Accurate Acoustic Emission Sources via Kernel Density Estimates

Original language description

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.

Czech name

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Czech description

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Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

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OECD FORD branch

20306 - Audio engineering, reliability analysis

Project

<a href="/en/project/LM2015068" target="_blank" >LM2015068: Research Infrastructure for Fermilab Experiments</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

e-Journal of NDT

ISSN

1435-4934

e-ISSN

1435-4934

Volume of the periodical

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Issue of the periodical within the volume

January

Country of publishing house

DE - GERMANY

Number of pages

7

Pages from-to

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UT code for WoS article

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EID of the result in the Scopus database

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