Reflection and Transmission of Sound From a Dipole Source Near a Rigid Porous Medium

Li, K. M.; Tao, Hongdan

doi:10.3813/aaa.918649

Cited by 6 publications

(2 citation statements)

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“…The present work aims at improving the modelling of aircraft noise propagation by using a heuristic model for a point source in arbitrary motion [3]. This heuristic model can be seen as an extension of the analytical "Dopplerized" Weyl Van der Pol formulation [4][5][6][7][8] that is only valid for sources in motion parallel to the ground. The heuristic model does not yet account for the effects of the atmosphere on sound propagation (refraction and scattering), but does consider ground effects (absorption and scattering by ground roughness) where the ground admittance is determined at the Doppler frequencies [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Sound pressure radiated by a point-source in arbitrary motion above an absorbing ground: Application to aircraft noise

Kayser,

Dragna,

Blanc-Benon

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The acoustic regulations are increasingly stringent for aircraft noise. Aircraft manufacturers must therefore be able to predict accurately aircraft noise for certification scenarios as early as the design phase. Acoustic propagation models used in the industry are however based on simplified approaches. Thus, we use a heuristic model for a point source in arbitrary motion in a homogeneous atmosphere at rest above an absorbing ground proposed in the literature. It removes most of the simplification of existing approaches, but has however not been validated and applied for aircraft noise. These are the two goals of this study. The heuristic expression is first validated satisfactorily for several test cases against a numerical solution from a time-domain solver of the Linearized Euler equations. Then, a parametric study on ground properties (i.e. absorption, thickness and roughness) is performed to analyze ground effects on sound pressure levels estimation.

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Section: Introductionmentioning

confidence: 99%

Sound pressure radiated by a point-source in arbitrary motion above an absorbing ground: Application to aircraft noise

Kayser,

Dragna,

Blanc-Benon

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…Only few authors discussed the problem of a dipole source over the impedance plane. [11][12][13][14][15][16] Hess et al 15 studied the influence of ground reflection coefficient on the sound pressure field, for the purpose of ground impedance evaluation, using a dipole source. They used a measurement setup similar to the one depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Sound pressure around dipole source above porous surface

Prezelj

Šteblaj

Čudina

2014

The Journal of the Acoustical Society of America

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University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia prezelj.jurij@gmail.com, peter.steblaj@fs.uni-lj.si, mirko.cudina@fs.uni-lj.si Abstract: A technique for in situ measurements of acoustic properties of a fibrous porous material is proposed in this paper. Proposed technique exploits a directivity pattern of a dipole source in its very near field. Theoretical analysis for the proposed technique is based on the Rayleigh integral with a complex reflection included. Results are compared with results of FEM analysis and show that flow resistivity of a porous material placed in the very near field of the dipole source has significant influence on the sound pressure at its ring. Results provide an excellent starting point for the design of the sensor for sound absorption.

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