Methods for determination of Lamb wave dispersion curves by means of Fourier transform
Result 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 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.
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The result's identifiers
Result code in IS VaVaI
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Methods for determination of Lamb wave dispersion curves by means of Fourier transform
Original language 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 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.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
BI - Acoustics and oscillation
OECD FORD branch
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Result continuities
Project
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Basic information
Result type
O - Miscellaneous
CEP
BI - Acoustics and oscillation
Year of implementation
2010