Study of active acoustic metasurface and design of its control system

Ouyang, H ORCID: 0000-0003-0312-0326, Zhou, X, Gong, K and Mo, J (2022) Study of active acoustic metasurface and design of its control system. Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology, 62 (5). pp. 441-453.

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Abstract

In order to overcome the deficiencies of poor reconfigurability, single functionality and insufficient stability of current acoustic metasurfaces, a precision-tuneable multi-mode resonator-type acoustic metasurface is presented based on acoustics which contains a programmable logic controller. Firstly, the theoretical model of the slit width and phase variation of the metasurface is proposed. The slit width distributions required to achieve continuously tuneable acoustic focusing and acoustic refraction are calculated, respectively. Then they are modified based on the maximum speed of the motor in the actuation system. Secondly, the control system including a hardware system with single-master multi-slaver mode and an algorithm for regulating the motor rotation output is designed. Finally, several tests to modulate acoustic wave fronts are carried out on the proposed metasurface by using a self-developed test apparatus. How the metasurface manipulates the acoustic field of an incident plane wave is numerically simulated based on the finite element method. The experimental and numerical results show that the designed control system can accurately and synchronously tune the slit width of each unit of the metasurface and achieve multi functions. The error of the designed algorithm is between 0 and 1. 1 %. Moreover, the initial design of the control system is improved to achieve smoothness and robustness in its operation. The problems of the poor reconfigurability of the conventional acoustic metasurfaces as well as the time-varying volume of the resonator chamber caused by the fluctuation of the fluidic system are overcome by the proposed active acoustic metasurface, which can enhance the practical applicability of the metasurface. Thus, this research provides a certain guidance for acoustic metasurfaces in active acoustic wave manipulation.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	27 Oct 2022 07:36
Last Modified:	18 Jan 2023 19:49
DOI:	10.7511/dllgxb202205001
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3165795