Optimal shaping of rectangular acoustic black holes for sound absorption in air

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F23%3A00371528" target="_blank" >RIV/68407700:21230/23:00371528 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.61782/fa.2023.0181" target="_blank" >https://doi.org/10.61782/fa.2023.0181</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.61782/fa.2023.0181" target="_blank" >10.61782/fa.2023.0181</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optimal shaping of rectangular acoustic black holes for sound absorption in air

Popis výsledku v původním jazyce

In this work, we examine the performance of rectangular acoustic black holes (ABHs) serving as an anechoic termination in air-filled waveguides. These ABHs, consisting of rigid ribs separated by narrow slits with varying heights, are designed to slow down and absorb impinging acoustic waves. A one-dimensional mathematical model, employing the Riccati equation, is used for the numerical calculations. It accounts for the attenuation of acoustic energy in the thermo-viscous boundary layer through the use of an equivalent fluid model. The accuracy of this simplified, but computationally efficient model is verified by comparing its results to those obtained from a two-dimensional simulation using linearized Navier-Stokes equations and the finite element method. To optimize the ABH profile for maximum acoustic energy absorption, a genetic algorithm is employed in conjunction with the simplified mathematical model. The results demonstrate that the ABHs with an optimized profile exhibit superior performance compared to those with a non-optimized profile, but otherwise the same internal structure.

Název v anglickém jazyce

Optimal shaping of rectangular acoustic black holes for sound absorption in air

Popis výsledku anglicky

In this work, we examine the performance of rectangular acoustic black holes (ABHs) serving as an anechoic termination in air-filled waveguides. These ABHs, consisting of rigid ribs separated by narrow slits with varying heights, are designed to slow down and absorb impinging acoustic waves. A one-dimensional mathematical model, employing the Riccati equation, is used for the numerical calculations. It accounts for the attenuation of acoustic energy in the thermo-viscous boundary layer through the use of an equivalent fluid model. The accuracy of this simplified, but computationally efficient model is verified by comparing its results to those obtained from a two-dimensional simulation using linearized Navier-Stokes equations and the finite element method. To optimize the ABH profile for maximum acoustic energy absorption, a genetic algorithm is employed in conjunction with the simplified mathematical model. The results demonstrate that the ABHs with an optimized profile exhibit superior performance compared to those with a non-optimized profile, but otherwise the same internal structure.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10307 - Acoustics

Projekt

<a href="/cs/project/GA22-33896S" target="_blank" >GA22-33896S: Pokročilé metody řízení zvukových a elastických vlnových polí: akustické černé díry, metamateriály a funkčně gradované materiály</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Forum Acusticum 2023

ISBN

978-88-88942-67-4

ISSN

2221-3767

e-ISSN

2221-3767

Počet stran výsledku

6

Strana od-do

4405-4410

Název nakladatele

European Acoustics Association

Místo vydání

Madrid

Místo konání akce

Torino

Datum konání akce

11. 9. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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