Analysis and optimisation of an active noise control system as a potential acoustic metamaterial building block
Analysis and optimisation of an active noise control system as a potential acoustic metamaterial building block
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发表时间：
2019
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通讯作者：
J. Tan
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作者：
J. Tan
有源噪声控制(ANC)系统已被用于各种应用中，以在轻便紧凑的封装中提供低频率的高性能噪声控制。最近，声学超材料(AMM)被提出并被证明是实现高水平噪声控制的一种替代方法。AMM是由一组亚波长单位单元组成的工程结构，表现出传统材料中看不到的行为。例如，无源谐振器被设计成实现负有效材料特性和操纵波的传播。然而，这些AMM通常具有窄的带隙，从而抑制了波的传播。在充当AMM时，ANC系统已被证明可以提高性能、可调性和适应性，但物理洞察力通常有限。因此，本文研究了传统ANC对有效材料性质的影响，并通过对一维管道系统中波传播的分析展示了物理洞察力。然后对有源单胞进行了优化，使有效材料性能直接最小化，并给出了相应的物理分析。
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.