Application of Viscothermal Wave Propagation Theory for Reduction of Boundary Layer Induced Noise

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Boundary layer induced noise, i.e. noise inside the aircraft resulting from the turbulent boundary layer enclosing the fuselage, is known to dominate air-cabin noise at cruise conditions. In this paper a method is described to design trim panels containing a large number of coupled tubes to effectively reduce this type of noise. The theory of viscothermal wave propagation in tubes, as presented by Tijdeman [3], is discussed. To illustrate the procedure the absorption coefficient for a panel containing a number of non-coupled tubes is calculated. Initial results optimising the tubes’ length and radii for a desired fictive absorption coefficient are presented and prove the applicability of the method.
Original languageUndefined
Title of host publicationEuronoise
EditorsG. Brambilla, C. Ianeillo, L. Maffei
Place of PublicationNapels
PublisherAssociazione Italiana di Acustica (AIA)
Number of pages6
ISBN (Print)88-88942-00-9
Publication statusPublished - 19 May 2003
Event5th European Conference on Noise Control, EURONOISE 2003 - Naples, Italy
Duration: 19 May 200321 May 2003
Conference number: 5


Conference5th European Conference on Noise Control, EURONOISE 2003
Abbreviated titleEURONOISE


  • METIS-216820
  • IR-58837

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