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 , 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.
|Title of host publication||Euronoise|
|Editors||G. Brambilla, C. Ianeillo, L. Maffei|
|Place of Publication||Napels|
|Publisher||Associazione Italiana di Acustica (AIA)|
|Number of pages||6|
|Publication status||Published - 19 May 2003|
|Event||5th European Conference on Noise Control, EURONOISE 2003 - Naples, Italy|
Duration: 19 May 2003 → 21 May 2003
Conference number: 5
|Conference||5th European Conference on Noise Control, EURONOISE 2003|
|Period||19/05/03 → 21/05/03|
Wijnant, Y. H., Hannink, M. H. C., & de Boer, A. (2003). Application of Viscothermal Wave Propagation Theory for Reduction of Boundary Layer Induced Noise. In G. Brambilla, C. Ianeillo, & L. Maffei (Eds.), Euronoise (pp. -). Napels: Associazione Italiana di Acustica (AIA).