Electrically tunable and broader-band sound absorption by using micro-perforated dielectric elastomer actuator

Zhenbo Lu, Milan Shrestha, Gih Keong Lau*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

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.

Original languageEnglish
Article number182901
JournalApplied Physics Letters
Volume110
Issue number18
DOIs
StatePublished - 1 May 2017

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