Nannen, Lothar und Koch, Werner und Hein, Stefan (2010) Resonance problems in acoustic waveguides. 1st EAA - EuroRegio Congress on Sound and Vibration, 2010-09-15 - 2010-09-18, Ljubljana, Slovenia. ISBN 978-961-269-283-4.
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Kurzfassung
Acoustic resonance problems in closed systems can be solved numerically with finite element methods. The resulting real resonances become complex, if the system changes to an open system with an unbounded domain. While for a completely open system only damped resonances exist, laterally confined domains can sustain localized, truly trapped modes with nominally zero radiation loss. These discrete resonant modes cannot be excited linearly by continuous propagating duct modes due to symmetry constraints. If the symmetry of the geometry is broken the trapped modes become highly localized quasi-trapped modes which can interfere with the propagating duct modes. Since standard finite element methods are restricted to bounded domains, in a numerical treatment of such problems so called transparent or non-reflecting boundary conditions are needed. In this paper two different types of transparent boundary conditions namely the complex scaling method and the Hardy space infinite element method, are used to compute resonances as well as transmission and reflection coefficients for symmetric obstacles in a two dimensional waveguide.
elib-URL des Eintrags: | https://elib.dlr.de/64749/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag, Paper) | ||||||||||||||||
Titel: | Resonance problems in acoustic waveguides | ||||||||||||||||
Autoren: |
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Datum: | September 2010 | ||||||||||||||||
Referierte Publikation: | Nein | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
Name der Reihe: | Book of Abstracts, Conference Proceedings on CD-ROM | ||||||||||||||||
ISBN: | 978-961-269-283-4 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | Fano resonance, acoustic waveguide, complex scaling, perfectly matched layer, Hardy space infinite element method | ||||||||||||||||
Veranstaltungstitel: | 1st EAA - EuroRegio Congress on Sound and Vibration | ||||||||||||||||
Veranstaltungsort: | Ljubljana, Slovenia | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 15 September 2010 | ||||||||||||||||
Veranstaltungsende: | 18 September 2010 | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||
HGF - Programmthema: | Starrflügler (alt) | ||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Flugphysik (alt) | ||||||||||||||||
Standort: | Göttingen | ||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber | ||||||||||||||||
Hinterlegt von: | Hein, Dr.-Ing. Stefan | ||||||||||||||||
Hinterlegt am: | 14 Okt 2010 14:07 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 19:29 |
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