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Dispersive Acoustical Propagation in Stratified Structures Propagation acoustique dispersive dans des structures stratifiées.

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In order to compare the theories of Brekhovskikh and Hegemier on wave propagation in stratified media, the velocity dispersion of an ultrasonic wave train was studied which propagates in a structure of layers of aluminium-epoxyde, in the frequency range 0.2–1.5 MHz. Two modes of propagation, a fast and a slow mode, predicted by the two theories of Brekhovskikh and Hegemier, were observed. The Brekhovskikh theory fits better to the experimental data than Hegemier's theory. The waveform of an ultrasonic wave train transmitted through the structure is computed by means of the stationary phase method for two modes. The computed signal is similar to the experimental signal.

Afin de comparer les théories de Brekhovskikh et d'Hegemier relatives á la dispersion acoustique de célérite dans des milieux stratifiés, on étudie la célérité de phase d'une onde ultrasonore se propageant parallèlement aux strates d'une structure aluminium – résine époxyde dans la gamme de fréquences 0.2–1.5 MHz. On a mis en évidence les modes lent et rapide prévus par les théories de Brekhovskikh et de Hegemier. La théorie de Brekhovskikh ajuste mieux les résultats expérimentaux que la théorie d'Hegemier. Dans le cas où les deux modes sont présents on a simulé la propagation d'un train d'ondea à fréquence fixe de 1MHz. Le signal synthétique calculé par la méthode de la phase stationnaire est sembiable au signal expérimental.
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Language: French

Document Type: Research Article

Publication date: May 1, 1996

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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