Number of the records: 1
Adaptive acoustic metasurfaces for the active sound field control
- 1.
SYSNO ASEP 0469397 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Adaptive acoustic metasurfaces for the active sound field control Author(s) Steiger, Kateřina (UFP-V) RID
Mokrý, P. (CZ)
Václavík, J. (CZ)
Psota, Pavel (UFP-V) RID, ORCID
Doleček, Roman (UFP-V) RID
Vápenka, David (UFP-V) RID
Nečásek, J. (CZ)
Koldovský, Z. (CZ)Article number ICA2016-597 Source Title PROCEEDINGS of the 22nd International Congress on Acoustics. - Buenos Aires : Asociación de Acústicos Argentinos, 2016 - ISSN 2415-1599 - ISBN 978-987-24713-6-1 Number of pages 10 s. Publication form Online - E Action International Congress on Acoustics (ICA2016) /22./ Event date 05.09.2016 - 09.09.2016 VEvent location Buenos Aires Country AR - Argentina Event type WRD Language eng - English Country AR - Argentina Keywords Adaptive acoustic metasurfaces ; Active sound field control Subject RIV JI - Composite Materials R&D Projects LO1206 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA16-11965S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 Annotation 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. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
Number of the records: 1