论文期刊

A Transparent Membrane for Active Noise Cancelation




作者: Philipp Rothemund, Xavier P. Morelle, Kun Jia, George M. Whitesides, Zhigang Suo
发表/完成日期: 2018-05-22
期刊名称: Advanced function material
期卷:
相关文章:
论文简介
A method for active noise cancelation that uses an optically transparent
membrane is described. The membrane consists of a prestretched hydrophobic
elastomer, attached to a rigid frame and sandwiched between two
hydrogels swollen with an aqueous solution of salt. The elastomer functions
as a dielectric, and the hydrogel functions as an ionic conductor. When the
two hydrogels are subjected to a sinusoidal voltage, the membrane generates
sound. A linear model for the reflection, transmission, and generation
of sound by the membrane in an impedance tube is presented and validated.
Active noise cancelation is demonstrated using the linear model and feedforward
control. Compared to passive sound absorption, the sound transmission
loss across the membrane is improved with active control from an average
value of 7 dB to an average value of 16 dB. The transparent membrane may be
used to cancel noises through a window, while maintaining its transparency
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