A model for near-perfect transmission through lossy media with acoustic sources

IF 1.3 4区 医学 Q3 AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY
Nathan Geib, S. Wallen, M. Haberman, Christina J. Naify
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引用次数: 0

Abstract

Acoustic metamaterials exhibit effective material properties not found in naturally occurring media, and, as such, have received considerable attention for their potential applications in noise and vibration control, diagnostic imaging, and nonreciprocal transmission. Complementary acoustic metamaterials have been proposed as a means of compensating for the high impedance mismatches of aberrating layers that disrupt the acoustic field and hence distort acoustic images. More recently, a complementary acoustic metamaterial featuring active components was shown in principal to compensate for both the impedance mismatch and energy attenuation of lossy materials, but a physical realization of the concept has not yet been implemented. Here, we present results from a one-dimensional acoustic model showing how a plane wave incident on a lossy material can be augmented by point monopole and dipole sources to allow for near perfect transmission, thus rendering the lossy medium acoustically transparent. We present general expressions for source magnitudes that are dimensionless with respect to frequency, material thickness, and the background medium. We show that these results are consistent with three-dimensional finite element simulations, where the appropriate monopolar and dipolar forces are generated using finite dimensional velocity sources with real loudspeaker characteristics mounted in an acoustic waveguide.
有声源的损耗介质近乎完美传输模型
声学超材料表现出在自然介质中所没有的有效材料特性,因此,由于其在噪声和振动控制、诊断成像和非互易传输方面的潜在应用而受到了相当大的关注。互补声学超材料已被提出作为补偿像差层的高阻抗失配的一种手段,这种失配破坏了声场,从而扭曲了声图像。最近,一种具有有源成分的互补声学超材料主要用于补偿阻抗失配和有耗材料的能量衰减,但该概念的物理实现尚未实现。在这里,我们展示了一维声学模型的结果,显示了入射到有耗材料上的平面波如何被点单极子和偶极子源增强,从而允许近乎完美的传输,从而使有耗介质在声学上透明。我们提出了关于频率、材料厚度和背景介质的无量纲源震级的一般表达式。我们表明这些结果与三维有限元模拟一致,其中使用安装在声波导中的具有真实扬声器特性的有限维速度源产生适当的单极和偶极力。
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来源期刊
Noise & Health
Noise & Health AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY-PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
CiteScore
2.10
自引率
14.30%
发文量
27
审稿时长
6-12 weeks
期刊介绍: Noise and Health is the only International Journal devoted to research on all aspects of noise and its effects on human health. An inter-disciplinary journal for all professions concerned with auditory and non-auditory effects of occupational, environmental, and leisure noise. It aims to provide a forum for presentation of novel research material on a broad range of topics associated with noise pollution, its control and its detrimental effects on hearing and health. It will cover issues from basic experimental science through clinical evaluation and management, technical aspects of noise reduction systems and solutions to environmental issues relating to social and public health policy.
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