Adaptive acoustic metasurfaces for the active sound field control

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00469397" target="_blank" >RIV/61389021:_____/16:00469397 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/46747885:24220/16:00003931

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Adaptive acoustic metasurfaces for the active sound field control

Popis výsledku v původním jazyce

Active acoustic metasurfaces (AAMSs) have been recently recognized as very efficient soundshielding structures, which can have large lateral dimensions perpendicular to the direction ofthe sound wave propagation but very short lateral dimension along the direction of the soundwavevector. The sound shielding principle of AAMSs is based on control of the specific acoustic impedance (SAI). This is achieved by means of an active tuning of elastic properties of piezoelectric transducers, which, therefore, represent the core element of the AAMSs. Using this approach, it is possible to actively control the acoustic coefficients of transmission and reflection of AAMSs. An important point, which has been recently discovered, is the fact that the great suppression of the transmission coefficient can be achieved in the regime, when the SAI of the AAMS is negative. The function of the AAMS in varying operational conditions or in a wide frequency range, however, put delicate stability conditions on the negative values of SAI. In order to keep the AAMS in the stable operation, a concept of adaptive acoustic metasurfaces (AdAMSs) is introduced in this paper. Methods for the real-time estimation and the active control of the SAI values of the AdAMSs are presented. It is shown that the accurate control of the distribution of the SAI on the surface of the AdAMS enables to control the transmitted sound field not only in the magnitude but also in the direction of the transmitted sound wave.

Název v anglickém jazyce

Adaptive acoustic metasurfaces for the active sound field control

Popis výsledku anglicky

Active acoustic metasurfaces (AAMSs) have been recently recognized as very efficient soundshielding structures, which can have large lateral dimensions perpendicular to the direction ofthe sound wave propagation but very short lateral dimension along the direction of the soundwavevector. The sound shielding principle of AAMSs is based on control of the specific acoustic impedance (SAI). This is achieved by means of an active tuning of elastic properties of piezoelectric transducers, which, therefore, represent the core element of the AAMSs. Using this approach, it is possible to actively control the acoustic coefficients of transmission and reflection of AAMSs. An important point, which has been recently discovered, is the fact that the great suppression of the transmission coefficient can be achieved in the regime, when the SAI of the AAMS is negative. The function of the AAMS in varying operational conditions or in a wide frequency range, however, put delicate stability conditions on the negative values of SAI. In order to keep the AAMS in the stable operation, a concept of adaptive acoustic metasurfaces (AdAMSs) is introduced in this paper. Methods for the real-time estimation and the active control of the SAI values of the AdAMSs are presented. It is shown that the accurate control of the distribution of the SAI on the surface of the AdAMS enables to control the transmitted sound field not only in the magnitude but also in the direction of the transmitted sound wave.

Druh

D - Stať ve sborníku

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

PROCEEDINGS of the 22nd International Congress on Acoustics

ISBN

978-987-24713-6-1

ISSN

2415-1599

e-ISSN

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Počet stran výsledku

10

Strana od-do

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Název nakladatele

Asociación de Acústicos Argentinos

Místo vydání

Buenos Aires

Místo konání akce

Buenos Aires

Datum konání akce

5. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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