Adaptive acoustic metasurfaces for the noise shielding.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00481824" target="_blank" >RIV/61389021:_____/17:00481824 - isvavai.cz</a>

Alternative codes found

RIV/46747885:24220/17:00005398

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 noise shielding.

Original language description

It is known that active acoustic metasurfaces (AAMSs), which consist of the curved glass shell with attached piezoelectric transducers, can provide efficient means for the noise shielding. The principle standing behind this effect is based on the electronic control of the acoustic impedance (AI) of the AAMS, which is achieved by connecting the piezoelectric transducers to the active shunt circuits. When the connected shunt circuit has a required value of the complex electrical impedance, it is possible to achieve extremely high negative values of the AI of the AAMS. This regime is often called the negative elasticity regime (NER) of the AAMS. In the NER, the incident sound wave can be completely reflected and the transmitted sound vanishes. Unfortunately, the working point of the electrical circuit is located near the edge of the stability region, when the AMMS operates in the NER. In this Paper, we demonstrate experimentally that it is possible to construct an adaptive AMMS, which is stable in varying operational conditions. The adaptive AMMS is achieved by introducing an additional feedback loop for the control of the required value of the AI. This is attained by introducing the system for the real-time estimation of the AI value and the accurate control of the complex electrical impedance of the shunt circuit by means of the iterative algorithm.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

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

Continuities

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

Publication year

2017

Confidentiality

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

Article name in the collection

Proceedings of the 24th International Congress on Sound and Vibration 2017

ISBN

978-1-906913-27-4

ISSN

2329-3675

e-ISSN

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Number of pages

8

Pages from-to

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Publisher name

International Institute of Acoustics and Vibration, IIAV

Place of publication

London

Event location

London

Event date

Jul 23, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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