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

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Description	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 the frequency-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. 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 the frequency-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. (en)
Title	Methods for determination of Lamb wave dispersion curves by means of Fourier transform Methods for determination of Lamb wave dispersion curves by means of Fourier transform (en)
skos:prefLabel	Methods for determination of Lamb wave dispersion curves by means of Fourier transform Methods for determination of Lamb wave dispersion curves by means of Fourier transform (en)
skos:notation	RIV/61388998:_____/10:00349480!RIV11-GA0-61388998
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA101/09/1630), Z(AV0Z20760514)
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Hora, Petr Červená, Olga
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav termomechaniky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	270706
http://linked.open...ai/riv/idVysledku	RIV/61388998:_____/10:00349480
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Lamb wave; dispersion curves; Fourier transform; FEM (en)
http://linked.open.../riv/klicoveSlovo	Lamb wave dispersion curves FEM Fourier transform
http://linked.open...ontrolniKodProRIV	[F992DEB50D8B]
http://linked.open...in/vavai/riv/obor	BI
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Numerical solution to steady-state and transient wave dispersion in mechanical systems on different scales
http://linked.open...UplatneniVysledku	2010
http://linked.open...iv/tvurceVysledku	Hora, Petr Červená, Olga
http://linked.open...n/vavai/riv/zamer	Complex dynamical systems in thermodynamics, fluid and solid mechanics

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