Methods for determination of Lamb wave dispersion curves by means of Fourier transform

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F10%3A00349480" target="_blank" >RIV/61388998:_____/10:00349480 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Methods for determination of Lamb wave dispersion curves by means of Fourier transform

Popis výsledku v původním jazyce

This contribution reports on methods for determination of Lamb wave dispersion curves by means of Fourier transform (FT). A temporal FT may be carried out to go from the time to the frequency domain, and then a spatial FT may be carried out to go to thefrequency-wave-number domain, where the amplitudes and the wave-numbers of individual modes may be measured. The result of this transformation will be a 2D array of amplitudes at discrete frequencies and wave-numbers. Other method of determination of dispersion curves is based on solution of FEM task in frequency domain. The frequency spectrum of a time-dependent excitation is defined using FT. Since a small number of frequencies are sufficient to achieve a correct representation of a wide variety of temporal excitations, this approach considerably speeds up the computation by avoiding the temporal FFT and by decreasing the number of calculation steps.

Název v anglickém jazyce

Methods for determination of Lamb wave dispersion curves by means of Fourier transform

Popis výsledku anglicky

This contribution reports on methods for determination of Lamb wave dispersion curves by means of Fourier transform (FT). A temporal FT may be carried out to go from the time to the frequency domain, and then a spatial FT may be carried out to go to thefrequency-wave-number domain, where the amplitudes and the wave-numbers of individual modes may be measured. The result of this transformation will be a 2D array of amplitudes at discrete frequencies and wave-numbers. Other method of determination of dispersion curves is based on solution of FEM task in frequency domain. The frequency spectrum of a time-dependent excitation is defined using FT. Since a small number of frequencies are sufficient to achieve a correct representation of a wide variety of temporal excitations, this approach considerably speeds up the computation by avoiding the temporal FFT and by decreasing the number of calculation steps.

Druh

O - Ostatní výsledky

CEP obor

BI - Akustika a kmity

OECD FORD obor

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Projekt

<a href="/cs/project/GA101%2F09%2F1630" target="_blank" >GA101/09/1630: Numerické řešení stacionárních a nestacionárních problémů dispersního šíření vln v mechanických systémech na různých úrovních</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

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