Active acoustic metasurface with an array of piezoelectric membranes and local control of acoustic impedance

0572319 - ÚFP 2024 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Václavík, J. - Nečásek, J. - Mokrý, P. - Steiger, Kateřina
Active acoustic metasurface with an array of piezoelectric membranes and local control of acoustic impedance.
25th International Congress on Sound and Vibration. Auburn: International Institute of Acoustics and Vibration, 2018, Roč. 1 (2018), s. 555-561. ISBN 9781510868458.
[25th International Congress on Sound and Vibration. Hiroshima (JP), 08.07.2018-12.07.2018]
Institucionální podpora: RVO:61389021
Klíčová slova: Acoustic impedance * Active acoustic metasurface * Discrete control * Elasticity control * Piezoelectric membrane
Obor OECD: Optics (including laser optics and quantum optics)

It is known that acoustic metasurfaces (AMS) represent powerful tools which can be used for the construction of impedance or phase gratings to control the reflected sound field. The main drawback of AMSs resides in the narrow operational frequency range, which can be avoided using the active control of acoustic impedance of the particular unit cell of the AMS. This can be achieved by introducing the curved piezoelectric membrane shunted by an active electronic circuit as a unit cell of the AMS according to the technique known as the active elasticity control. It is natural that large planar AMSs require the construction of arrays with a large number of actively tuned electroacoustic resonators. This puts considerable requirements on the complexity of the control electronics. In this paper, we introduce a novel concept of the electronic control of the acoustic impedance in the large array of actively tuned electroacoustic resonators by means of the methods of Active Matrix Addressing and Pulse Amplitude Modulation. We demonstrate the applicability of these two methods to control the acoustic properties of AMS by means of numerical simulations.
Trvalý link: https://hdl.handle.net/11104/0343055