Szczegóły publikacji
Opis bibliograficzny
A hybrid method for determination of the acoustic impedance of an unflanged cylindrical duct for multimode wave / Anna SNAKOWSKA, Jerzy JURKIEWICZ, Łukasz GORAZD // Journal of Sound and Vibration ; ISSN 0022-460X. — 2017 — vol. 396, s. 325–339. — Bibliogr. s. 338–339, Abstr. — Publikacja dostępna online od: 2017-03-09
Autorzy (3)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 111046 |
|---|---|
| Data dodania do BaDAP | 2018-01-10 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jsv.2017.02.040 |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Sound and Vibration |
Abstract
The paper presents derivation of the impedance matrix based on the rigorous solution of the wave equation obtained by the Wiener-Hopf technique for a semi-infinite unflanged cylindrical duct. The impedance matrix allows, in turn, calculate the acoustic impedance along the duct and, as a special case, the radiation impedance. The analysis is carried out for a multimode incident wave accounting for modes coupling on the duct outlet not only qualitatively but also quantitatively for a selected source operating inside. The quantitative evaluation of the acoustic impedance requires setting of modes amplitudes which has been obtained applying the mode decomposition method to the far-field pressure radiation measurements and theoretical formulae for single mode directivity characteristics for an unflanged duct. Calculation of the acoustic impedance for a non-uniform distribution of the sound pressure and the sound velocity on a duct cross section requires determination of the acoustic power transmitted along/radiated from a duct. In the paper, the impedance matrix, the power, and the acoustic impedance were derived as functions of Helmholtz number and distance from the outlet. (C) 2017 Elsevier Ltd. All rights reserved.
