Journal ArticleDOI
A computational mode-matching approach for sound propagation in three-dimensional ducts with flow
Gwenael Gabard,R.J. Astley +1 more
TLDR
In this paper, a finite element (FE) mode-matching approach for duct acoustics with flow and circumferentially varying liners is presented for sound attenuation in turbofan inlets and bypass ducts.About:
This article is published in Journal of Sound and Vibration.The article was published on 2008-09-09. It has received 81 citations till now. The article focuses on the topics: Aeroacoustics & Acoustic attenuation.read more
Citations
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Journal ArticleDOI
Failure of the Ingard–Myers boundary condition for a lined duct: An experimental investigation
Ygaäl Renou,Yves Aurégan +1 more
TL;DR: An effective lined wall impedance, valid whatever the direction of acoustic propagation, can be suitably found from experimental axial wavenumbers and a modified version of the Ingard-Myers condition with the form inspired from a previous theoretical study.
Journal ArticleDOI
A mode matching method for modeling dissipative silencers lined with poroelastic materials and containing mean flow.
TL;DR: A mode matching method for predicting the transmission loss of a cylindrical shaped dissipative silencer partially filled with a poroelastic foam is developed and demonstrates good agreement with finite element calculations provided a sufficient number of modes are retained.
Journal ArticleDOI
Eigenmodes of lined flow ducts with rigid splices
TL;DR: In this paper, an exact analytic expression for the acoustic eigenmodes of a cylindrical lined duct with rigid axially running splices in the presence of flow is presented.
Journal ArticleDOI
A mode matching approach for modeling two dimensional porous grating with infinitely rigid or soft inclusions.
TL;DR: This work investigates the acoustical properties of a multilayer porous material in which periodic inclusions are embedded and adopts a mode matching approach, more convenient for a layered system, to study the acoustic absorption behavior.
Journal ArticleDOI
Optimisation of micro-perforated cylindrical silencers in linear and nonlinear regimes
TL;DR: In this paper, the authors describe analytical and experimental studies conducted to understand the potential of lightweight non-fibrous alternatives to dissipative mufflers for induct noise control problems, especially under high sound pressure levels (SPLs) and in the low frequency domain.
References
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MonographDOI
ARPACK Users' Guide: Solution of Large-Scale Eigenvalue Problems with Implicitly Restarted Arnoldi Methods
TL;DR: The Arnoldi factorization, the implicitly restarted Arnoldi method: structure of the Eigenvalue problem Krylov subspaces and projection methods, and more.
Journal ArticleDOI
The interaction of sound with a subsonic jet issuing from a semi-infinite cylindrical pipe
TL;DR: In this article, the transmission of sound out of a semi-infinite circular jet pipe in the presence of subsonic flow from the pipe is investigated and a solution satisfying the Kutta condition and causality is found which possesses an instability wave term that dominates within a region of approximately 45° to the downstream jet axis.
Journal ArticleDOI
A classification of duct modes based on surface waves
TL;DR: In this paper, the authors classified the modes of a turbofan engine duct into two categories: genuine acoustic 3D duct modes resulting from the finiteness of the duct geometry, and 2D surface waves that exist only near the wall surface.
Journal ArticleDOI
Theoretical model for sound radiation from annular jet pipes: far- and near-field solutions
Gwenael Gabard,R.J. Astley +1 more
TL;DR: In this article, an analytical model for sound radiation from a semi-infinite unflanged annular duct is presented, where noise propagates along the annular bypass duct, refracts through the external bypass stream and radiates to the far field.