Time-frequency and wavelet transform applied toselected problems in ultrasonics NDE

Whereas valuable so- lutions exist, for instance based on angular resampling, this paper proposed a new speed transform which inherits all the properties of the Fourier transform –

The modelling method is based on the combination of NF/NF transform with PWS theory applied to EM NF radiation, TL coupling BLT equation and FFT/IFFT with

462 - B. La résponsabilité et l’assurance des architectes, des entrepreneurs et autres locateurs d’ouvrage, Journal des notaires et des avocats, Paris, 1979, pp.. 2

Abstract : In this paper, we contribute by the development of some signal processing techniques based on time frequency and wavelet transform in order to enhance the sensibility

Abstract : In this paper, we contribute by the development of some signal processing techniques based on time frequency and wavelet transform in order to enhance the sensibility

Dans second problème, on a étudié l’existence, l’unicité et la stabilité asymptotique d’un système linéaire unidimensionnel de la thermoélasticité de Timoshenko, où

D’après la figure 4-4(a) on remarque que les structures présentent des larges bandes interdites ainsi que de grandes oscillations (franges d’interférence) dans

Similarly to what has been done for the time coordinate, the expression of the time-frequency representation at point pt, ν q as the sum of a mass function Φ t,ν , proved in