Determination of group velocity of propagation of Lamb waves in aluminium plate using piezoelectric transducers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43932186" target="_blank" >RIV/49777513:23520/17:43932186 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.24132/acm.2017.346" target="_blank" >http://dx.doi.org/10.24132/acm.2017.346</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.24132/acm.2017.346" target="_blank" >10.24132/acm.2017.346</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of group velocity of propagation of Lamb waves in aluminium plate using piezoelectric transducers

Popis výsledku v původním jazyce

A prior knowledge of group velocities of Lamb wave modes is a key for analysis of time signals in guided-wave based structural health monitoring. The identification of multiple wave modes may be complicated due to dependency of group velocity on frequency (dispersion). These dependencies for infinite plate of constant thickness can be calculated by a numerical solution of analytic equation. Two alternative approaches to determine group velocities of zero-order Lamb wave modes in aluminum plate were used in this work: Two-dimensional Fast Fourier Transform (2D-FFT) and methods of time-frequency processing. 2D-FFT requires a high number of time signals in equidistant points, therefore it was applied on data from finite element analysis of wave propagation in the plate. Group velocities for chosen frequencies were also determined using wavelet transform (WT) of signals as differencies of times-of-arrival measured by a pair of piezoelectric transducers. The results from 2D-FFT and wavelet transform were compared to the analytic solution.

Název v anglickém jazyce

Determination of group velocity of propagation of Lamb waves in aluminium plate using piezoelectric transducers

Popis výsledku anglicky

A prior knowledge of group velocities of Lamb wave modes is a key for analysis of time signals in guided-wave based structural health monitoring. The identification of multiple wave modes may be complicated due to dependency of group velocity on frequency (dispersion). These dependencies for infinite plate of constant thickness can be calculated by a numerical solution of analytic equation. Two alternative approaches to determine group velocities of zero-order Lamb wave modes in aluminum plate were used in this work: Two-dimensional Fast Fourier Transform (2D-FFT) and methods of time-frequency processing. 2D-FFT requires a high number of time signals in equidistant points, therefore it was applied on data from finite element analysis of wave propagation in the plate. Group velocities for chosen frequencies were also determined using wavelet transform (WT) of signals as differencies of times-of-arrival measured by a pair of piezoelectric transducers. The results from 2D-FFT and wavelet transform were compared to the analytic solution.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/LO1506" target="_blank" >LO1506: Podpora udržitelnosti centra NTIS - Nové technologie pro informační společnost</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Applied and Computational Mechanics

ISSN

1802-680X

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

10

Strana od-do

23-32

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85021774654