Analysis and optimisation of an active noise control system as a potential acoustic metamaterial building block

Tan, Joe, Cheer, Jordan and Daley, Stephen (2019) Analysis and optimisation of an active noise control system as a potential acoustic metamaterial building block. In 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019. pp. 4884-4891 .

Abstract

Active Noise Control (ANC) systems have been employed in a variety of applications to provide high performance noise control at low frequencies, within a lightweight and compact package. Recently, acoustic metamaterials (AMM) have been proposed and demonstrated as an alternative approach to achieving high levels of noise control. AMM are engineered structures that consist of an array of subwavelength unit cells, which exhibit behaviour not seen in conventional materials. For example, passive resonators have been designed to achieve negative effective material properties and manipulate wave propagation. These AMMs, however, typically have narrow band gaps, where wave propagation is suppressed. When acting as an AMM, ANC systems have been shown to improve performance, tuneability and adaptability, but physical insights have generally been limited. Therefore, this paper investigates the effects of traditional ANC on the effective material properties and shows physical insight through an analysis of the wave propagation within a one-dimensional duct system. The active unit cell has then been optimised to directly minimise the effective material properties and a corresponding physical analysis has been presented.

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Contributors

Author: Jordan Cheer

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