Volume 120, Number 5, December 2017
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||19 February 2018|
A space-coiled acoustic metamaterial with tunable low-frequency sound absorption
Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073, PRC
Received: 7 December 2017
Accepted: 23 January 2018
A novel low-frequency absorber composed a perforated panel and a cavity with a coiled-up channel is presented and demonstrated. Both theoretical analysis and finite element method are utilized to reveal that the absorber possesses a low-frequency absorption with deep-subwavelength thickness. The effect of the folding number of a space-coiled channel on the absorption peak position is discussed and the result shows that a greater folding number can reduce the absorption peak frequency dramatically without sacrificing the total thickness of the absorber. In order to broaden the absorption bandwidth, an absorber combining two units with different folding number is constructed to further enhance the low-frequency absorption performance.
PACS: 43.20.+g – General linear acoustics / 43.50.+y – Noise: its effects and control
© EPLA, 2018
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