Sound reduction by metamaterial-based acoustic enclosure

Journal Article · Mon Dec 15 04:00:00 EST 2014 · AIP Advances

DOI:https://doi.org/10.1063/1.4902339· OSTI ID:22420181

Yao, Shanshan; Li, Pei; Zhou, Xiaoming; Hu, Gengkai ^[1]

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1. Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education and School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081 (China)

In many practical systems, acoustic radiation control on noise sources contained within a finite volume by an acoustic enclosure is of great importance, but difficult to be accomplished at low frequencies due to the enhanced acoustic-structure interaction. In this work, we propose to use acoustic metamaterials as the enclosure to efficiently reduce sound radiation at their negative-mass frequencies. Based on a circularly-shaped metamaterial model, sound radiation properties by either central or eccentric sources are analyzed by numerical simulations for structured metamaterials. The parametric analyses demonstrate that the barrier thickness, the cavity size, the source type, and the eccentricity of the source have a profound effect on the sound reduction. It is found that increasing the thickness of the metamaterial barrier is an efficient approach to achieve large sound reduction over the negative-mass frequencies. These results are helpful in designing highly efficient acoustic enclosures for blockage of sound in low frequencies.

• OSTI ID: 22420181
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 12 Vol. 4; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPUTERIZED SIMULATION
CONTROL
DIFFUSION BARRIERS
INTERACTIONS
NEGATIVE MASS
PARAMETRIC ANALYSIS
REDUCTION
SOUND WAVES
THICKNESS