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Interference aspect of the interaction between two elastic tubes: impulsive and quasi-harmonic studies Aspect interférentiel de l'interaction entre deux tubes élastiques: études impulsionnelle et quasi-harmonique

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The acoustic scattering from a target composed by two elastic cylindrical shells immersed in water is experimentally studied. Two methods are used: the first is the impulsive one, the second the quasi-harmonic one. The shells and the transducer emitter are in an eclipsed configuration. The impulsive method allows us to obtain, on the first hand, the resonance spectrum, and on the second hand, the paths of the waves involved in the scattering. The quasi-harmonic method shows that the scattering involves an interferential phenomenon related to radiation and reradiation by the two shells. Consequently, the acoustic scattering results from two complementary phenomenon: the resonant one and the interferential one. The last aspect is experimentally shown by the analysis of the different regimes obtained in the quasi-harmonic backscattering and by the study of the angular diagrams in the reemission regime. A theoritical study gives angular diagrams which agree very well with the experimental ones; it clearly shows the interferential phenomenon.

La diffusion acoustique par une cible composée de deux tubes élastiques immergés verticalement dans l'eau est abordée expérimentalement par une excitation impulsionnelle et par une excitation quasi-harmonique. La cible est insonée à l'aide d'un transducteur positionné en éclipse par rapport aux deux tubes. L'étude impulsionnelle permet, d'une part, de montrer l'existence de résonances et, d'autre part, de déterminer les parcours suivis par les ondes mises en jeu dans le processus de diffusion acoustique. L'étude quasi-harmonique permet de montrer l'existence d'un phénomène interférentiellié au rayonnementde chacun des deux tubes. La diffusion acoustique résulte d'un double aspect, résonnant et interférentiel. Ce dernier est bien mis en évidence, d'une part par l'étude fréquentielle de chaque partie du signal diffusé et, d'autre part, pour une fréquence égale à celle d'une résonance d'un tube, par l'étude des diagrammes angulaires dans le régime libre. Une analyse théorique fournit des diagrammes angulaires en trés bon accord avec ceux obtenus expérimentalement; elle montre clairement l'aspect interférentiel.

Language: French

Document Type: Research Article

Publication date: January 1, 1997

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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