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Title: Electrically tunable and broader-band sound absorption by using micro-perforated dielectric elastomer actuator
Authors: Lu, Zhenbo
Shrestha, Milan
Lau, Gih-Keong
Keywords: Acoustic absorption
Elastomeric polymers
Issue Date: 2017
Source: Lu, Z., Shrestha, M., & Lau, G.-K. (2017). Electrically tunable and broader-band sound absorption by using micro-perforated dielectric elastomer actuator. Applied Physics Letters, 110(18), 182901-.
Series/Report no.: Applied Physics Letters
Abstract: Most membrane-type acoustic absorbers for low-frequency sound attenuation are applicable only at a fixed resonant frequency for a narrow bandwidth. Tuning of the acoustic absorption spectrum is desired to match the varying noises. This letter presents a micro-perforated dielectric elastomer actuator (MPDEA) to make a broader-band acoustic absorber electrically tunable. Voltage activation of the MPDEA reduces the membrane tension and hole size and thus enables the active shifting of the acoustic absorption spectrum. Such a membrane tuning method does not require discrete mechanical parts as for the cavity tuning method. Also presented are the analytical models to predict the voltage-induced hole size change and acoustic characteristics of MPDEA.
ISSN: 0003-6951
DOI: 10.1063/1.4982634
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Singapore Centre for 3D Printing 
Rights: © 2017 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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