Eggler Daniel, Karimi Mahmoud, Kessissoglou Nicole
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales, Australia.
Centre for Audio, Acoustics and Vibration, University of Technology Sydney, New South Wales, Australia.
J Acoust Soc Am. 2019 Jul;146(1):586. doi: 10.1121/1.5119225.
Acoustic cloaking has mostly been considered within a stationary fluid. The authors herein show that accounting for the effects of convection in the presence of fluid flow is critical for cloaking in the acoustic domain. This work presents active acoustic cloaking in a convected flow field for two different incident fields, corresponding to a plane wave and a single monopole source, impinging on a rigid body. Monopole control sources circumferentially arranged around the rigid body are used to generate a secondary acoustic field to destructively interfere with the primary scattered field arising from the incident excitation cases. The authors show that for sound waves in a moving fluid, active cloaking can only be achieved using a convected cloak, which is dependent on Mach number.
声学隐身大多是在静止流体中进行考虑的。本文作者表明，在存在流体流动的情况下考虑对流效应对于声学领域的隐身至关重要。这项工作展示了在对流流场中针对两种不同入射场的有源声学隐身，这两种入射场分别对应平面波和单个单极子源，它们撞击一个刚体。围绕刚体周向排列的单极子控制源用于产生一个次级声场，以与由入射激励情况产生的初级散射场相消干涉。作者表明，对于运动流体中的声波，有源隐身只能通过依赖马赫数的对流隐身衣来实现。
