Adaptive acoustic metasurfaces for the active sound field control

Result code in 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>

Alternative codes found

RIV/46747885:24220/16:00003931

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Adaptive acoustic metasurfaces for the active sound field control

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JI - Composite materials

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Article name in the collection

PROCEEDINGS of the 22nd International Congress on Acoustics

ISBN

978-987-24713-6-1

ISSN

2415-1599

e-ISSN

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Number of pages

10

Pages from-to

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Publisher name

Asociación de Acústicos Argentinos

Place of publication

Buenos Aires

Event location

Buenos Aires

Event date

Sep 5, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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