TY - JOUR
T1 - Underwater metastructure with broadband sound absorption capability in low-frequency range above 20 Hz
AU - Zhang, Ruihao
AU - Song, Yifan
AU - Hou, Hong
AU - Gao, Nansha
N1 - Publisher Copyright:
© 2021 World Scientific Publishing Company.
PY - 2021/1/10
Y1 - 2021/1/10
N2 - We present an underwater metastructure with excellent sound absorption effect below 50 Hz. The periodic metastructure unit consists of a conical cavity, rubber matrix, and two metal disks. FEM results show that, in the range of 20-300 Hz, the proposed metastructure demonstrates the excellent sound absorption within 279 Hz bandwidth when the reference absorption coefficient is considered to be 0.5. Displacement vibration diagrams illustrate the addition of two layers of metal disks break the propagation law of acoustic wave in rubber matrix. An anti-phase motion of the rubber matrix emerges due to the presence of the metal disks, then consumes the energy of incident acoustic waves. The geometric parameters of lattice constant a, the thickness h1, and the height d1 of the upper metal disk are positively correlated with the sound absorption coefficient, while the upper radius r1 and the height hair of the conical cavity are negatively correlated with the sound absorption coefficient. The novel design presented in this study could have the potential applications in the realization of an acoustic underwater anechoic layer.
AB - We present an underwater metastructure with excellent sound absorption effect below 50 Hz. The periodic metastructure unit consists of a conical cavity, rubber matrix, and two metal disks. FEM results show that, in the range of 20-300 Hz, the proposed metastructure demonstrates the excellent sound absorption within 279 Hz bandwidth when the reference absorption coefficient is considered to be 0.5. Displacement vibration diagrams illustrate the addition of two layers of metal disks break the propagation law of acoustic wave in rubber matrix. An anti-phase motion of the rubber matrix emerges due to the presence of the metal disks, then consumes the energy of incident acoustic waves. The geometric parameters of lattice constant a, the thickness h1, and the height d1 of the upper metal disk are positively correlated with the sound absorption coefficient, while the upper radius r1 and the height hair of the conical cavity are negatively correlated with the sound absorption coefficient. The novel design presented in this study could have the potential applications in the realization of an acoustic underwater anechoic layer.
KW - Acoustic metastructure
KW - low-frequency sound absorption
KW - underwater anechoic layer
KW - wave-mode transformation
UR - http://www.scopus.com/inward/record.url?scp=85092516669&partnerID=8YFLogxK
U2 - 10.1142/S0217984921500391
DO - 10.1142/S0217984921500391
M3 - 文章
AN - SCOPUS:85092516669
SN - 0217-9849
VL - 35
JO - Modern Physics Letters B
JF - Modern Physics Letters B
IS - 1
M1 - 2150039
ER -