We present a constrained membrane-type acoustic metamaterial (CMAM) that employs constraint sticks to add out-of-plane dimensions in the design space of MAM. A CMAM sample, which adopts constraint sticks to suppress vibrations at the membrane center, was fabricated to achieve a sound transmission loss (STL) peak of 26 dB at 140 Hz, with the static areal density of 6.0 kg/m2. The working mechanism of the CMAM as an acoustic metamaterial is elucidated by calculating the averaged normal displacement, the equivalent areal density, and the effective dynamic mass of a unit cell through finite element simulations. Furthermore, the vibration modes of the CMAM indicate that the eigenmodes related to STL dips are shifted into high frequencies, thus broadening its effective bandwidth significantly. Three samples possessing the same geometry and material but different constraint areas were fabricated to illustrate the tunability of STL peaks at low frequencies.
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25 January 2016
Research Article|
January 26 2016
Membrane-constrained acoustic metamaterials for low frequency sound insulation
Xiaole Wang
;
Xiaole Wang
1Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering,
Shanghai Jiao Tong University
, Shanghai 200240, People's Republic of China
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Hui Zhao;
Hui Zhao
1Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering,
Shanghai Jiao Tong University
, Shanghai 200240, People's Republic of China
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Xudong Luo;
Xudong Luo
2Department of Physics,
Shanghai Jiao Tong University
, Shanghai 200240, People's Republic of China
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Zhenyu Huang
Zhenyu Huang
a)
1Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering,
Shanghai Jiao Tong University
, Shanghai 200240, People's Republic of China
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a)
Author to whom correspondence should be addressed. Electronic mail: bighuang@sjtu.edu.cn
Appl. Phys. Lett. 108, 041905 (2016)
Article history
Received:
November 17 2015
Accepted:
January 13 2016
Citation
Xiaole Wang, Hui Zhao, Xudong Luo, Zhenyu Huang; Membrane-constrained acoustic metamaterials for low frequency sound insulation. Appl. Phys. Lett. 25 January 2016; 108 (4): 041905. https://doi.org/10.1063/1.4940717
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