Scaling of membrane-type locally resonant acoustic metamaterial arrays

Metamaterials have emerged as promising solutions for manipulation of sound waves in a variety of applications. Locally resonant acoustic materials (LRAM) decrease sound transmission by 500% over acoustic mass law predictions at peak transmission loss (TL) frequencies with minimal added mass, making...

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Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 132; no. 4; p. 2784
Main Authors Naify, Christina J, Chang, Chia-Ming, McKnight, Geoffrey, Nutt, Steven R
Format Journal Article
LanguageEnglish
Published United States 01.10.2012
Subjects
Absorption
Acceleration
Acoustics - instrumentation
Aluminum
Epoxy Compounds
Equipment Design
Finite Element Analysis
Glass
Lasers
Manufactured Materials
Membranes, Artificial
Models, Theoretical
Polymers
Pressure
Silicone Elastomers
Sound
Vibration
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Summary:Metamaterials have emerged as promising solutions for manipulation of sound waves in a variety of applications. Locally resonant acoustic materials (LRAM) decrease sound transmission by 500% over acoustic mass law predictions at peak transmission loss (TL) frequencies with minimal added mass, making them appealing for weight-critical applications such as aerospace structures. In this study, potential issues associated with scale-up of the structure are addressed. TL of single-celled and multi-celled LRAM was measured using an impedance tube setup with systematic variation in geometric parameters to understand the effects of each parameter on acoustic response. Finite element analysis was performed to predict TL as a function of frequency for structures with varying complexity, including stacked structures and multi-celled arrays. Dynamic response of the array structures under discrete frequency excitation was investigated using laser vibrometry to verify negative dynamic mass behavior.
ISSN:1520-8524
DOI:10.1121/1.4744941