title: Scaling of membrane-type locally resonant acoustic metamaterial arrays.
abstract: 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.
authors.affiliation: Department of Materials Science, University of Southern California, 3651 Watt Way, VHE 402, Los Angeles, California 90089, USA. christina.naify@gmail.com
authors.forename: Christina J
authors.initials: CJ
authors.lastname: Naify
authors.forename: Chia-Ming
authors.initials: CM
authors.lastname: Chang
authors.forename: Geoffrey
authors.initials: G
authors.lastname: McKnight
authors.forename: Steven R
authors.initials: SR
authors.lastname: Nutt
mesh_terms: D000042:Absorption; D000054:Acceleration; D000162:Acoustics / Q000295:instrumentation*; D000535:Aluminum; D004852:Epoxy Compounds; D004867:Equipment Design; D020342:Finite Element Analysis; D005898:Glass; D007834:Lasers; D008420:Manufactured Materials; D008567:Membranes, Artificial; D008962:Models, Theoretical; D011108:Polymers; D011312:Pressure; D012826:Silicone Elastomers; D013016:Sound; D014732:Vibration
chemical_list: D004852:Epoxy Compounds; D008567:Membranes, Artificial; D011108:Polymers; D012826:Silicone Elastomers; C009753:fiberglass; C433673:polyetherimide; D000535:Aluminum