Multichannel resonant scattering theory applied to the acoustic scattering by an eccentric elastic cylindrical shell immersed in a fluid
Identifieur interne : 001204 ( France/Analysis ); précédent : 001203; suivant : 001205Multichannel resonant scattering theory applied to the acoustic scattering by an eccentric elastic cylindrical shell immersed in a fluid
Auteurs : E. B. Danila [Roumanie] ; J. M. Conoir [France] ; P. Pareige [France] ; J. L. Izbicki [France]Source :
- Wave Motion [ 0165-2125 ] ; 1998.
Abstract
The multichannel resonant scattering theory is developed in the field of the acoustic scattering. Because it takes into account mode conversions, this theory deals with a nondiagonal scattering S matrix. It is used here for the study of the acoustic scattering by an elastic eccentric shell. In this case the mode conversions are due to the fact that the Lamb type waves propagating around the shell are submitted to a reflection-refraction phenomenon when passing through the thinner part of the shell. All informations on the resonances are provided by the study of Argand's diagrams. In particular, the partition of the resonant energy over all the vibration modes of the scatterer is obtained. A numerical validation of the multichannel resonant scattering theory is then given. We focus our attention on the bifurcation of resonances, and the existence of angular diagrams with an odd numbers of lobes; both are due to mode conversions. Experiments have been performed which are in agreement with the theoretical results.
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DOI: 10.1016/S0165-2125(98)00018-3
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C.N.R.S. 1373, Université du Havre, Place Robert Schuman, 76610, Le Havre</wicri:regionArea><placeName><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region><settlement type="city">Le Havre</settlement></placeName><orgName type="university">Université du Havre</orgName></affiliation></author><author><name sortKey="Izbicki, J L" sort="Izbicki, J L" uniqKey="Izbicki J" first="J. L." last="Izbicki">J. L. Izbicki</name><affiliation></affiliation><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Acoustique Ultrasonore et d'Electronique, L.A.U.E., U.R.A. C.N.R.S. 1373, Université du Havre, Place Robert Schuman, 76610, Le Havre</wicri:regionArea><placeName><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region><settlement type="city">Le Havre</settlement></placeName><orgName type="university">Université du Havre</orgName></affiliation><affiliation wicri:level="1"><country wicri:rule="url">France</country></affiliation></author></analytic><monogr></monogr><series><title level="j">Wave Motion</title><title level="j" type="abbrev">WAMOT</title><idno type="ISSN">0165-2125</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1998">1998</date><biblScope unit="volume">28</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="297">297</biblScope><biblScope unit="page" to="318">318</biblScope></imprint><idno type="ISSN">0165-2125</idno></series><idno type="istex">65A36054B3487BF3F39FDD8A2F94F13FA3031FA6</idno><idno type="DOI">10.1016/S0165-2125(98)00018-3</idno><idno type="PII">S0165-2125(98)00018-3</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0165-2125</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The multichannel resonant scattering theory is developed in the field of the acoustic scattering. Because it takes into account mode conversions, this theory deals with a nondiagonal scattering S matrix. It is used here for the study of the acoustic scattering by an elastic eccentric shell. In this case the mode conversions are due to the fact that the Lamb type waves propagating around the shell are submitted to a reflection-refraction phenomenon when passing through the thinner part of the shell. All informations on the resonances are provided by the study of Argand's diagrams. In particular, the partition of the resonant energy over all the vibration modes of the scatterer is obtained. A numerical validation of the multichannel resonant scattering theory is then given. We focus our attention on the bifurcation of resonances, and the existence of angular diagrams with an odd numbers of lobes; both are due to mode conversions. Experiments have been performed which are in agreement with the theoretical results.</div></front></TEI><affiliations><list><country><li>France</li><li>Roumanie</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li></region><settlement><li>Le Havre</li></settlement><orgName><li>Université du Havre</li></orgName></list><tree><country name="Roumanie"><noRegion><name sortKey="Danila, E B" sort="Danila, E B" uniqKey="Danila E" first="E. B." last="Danila">E. B. Danila</name></noRegion></country><country name="France"><region name="Région Normandie"><name sortKey="Conoir, J M" sort="Conoir, J M" uniqKey="Conoir J" first="J. M." last="Conoir">J. M. Conoir</name></region><name sortKey="Izbicki, J L" sort="Izbicki, J L" uniqKey="Izbicki J" first="J. L." last="Izbicki">J. L. Izbicki</name><name sortKey="Izbicki, J L" sort="Izbicki, J L" uniqKey="Izbicki J" first="J. L." last="Izbicki">J. L. Izbicki</name><name sortKey="Pareige, P" sort="Pareige, P" uniqKey="Pareige P" first="P." last="Pareige">P. Pareige</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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