Results 191 to 200 of about 19,183 (214)
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Measurements of Underwater Sound Absorption Coefficient by the Reverberation Method
Japanese Journal of Applied Physics, 1986Measurements of underwater sound absorption coefficient are carried out on ten sample materials by the reverberation method using a reverberation water tank. In order to record short reverberation time in the tank, a digital memory is used. Measured absorption coefficient values are plotted against transmission loss of the samples, and the method is
Sumio Takahashi +2 more
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Effects of locally resonant modes on underwater sound absorption in viscoelastic materials
The Journal of the Acoustical Society of America, 2011Recently, by introducing locally resonant scatterers with spherical shape proposed in phononic crystals into design of underwater sound absorption materials, the low-frequency underwater sound absorption phenomenon induced by the localized resonances is observed. To reveal this absorption mechanism, the effect of the locally resonant mode on underwater
Jihong, Wen +5 more
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PDMS/MWCNT nanocomposite films for underwater sound absorption applications
Journal of Materials Science, 2020Polydimethylsiloxane (PDMS) nanocomposite films for underwater sound absorption applications are presented. Films were fabricated by a spin coating method and characterized using XPS, FTIR, TGA, SEM, tensile testing, and elastic cold-neutron scattering.
I. I. Kabir +8 more
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The Journal of the Acoustical Society of America, 2013
This paper concerns itself with the scattering and absorption of underwater incident sound by a coated infinite plate with an attached distributed inhomogeneity. Its objective is to determine if the distributed inhomogeneity can provide additional local reflection, such that it only increases the signal-to-noise ratio for a hydrophone detector placed ...
Yanni, Zhang, Jie, Pan
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This paper concerns itself with the scattering and absorption of underwater incident sound by a coated infinite plate with an attached distributed inhomogeneity. Its objective is to determine if the distributed inhomogeneity can provide additional local reflection, such that it only increases the signal-to-noise ratio for a hydrophone detector placed ...
Yanni, Zhang, Jie, Pan
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Smart skin of underwater vehicle with dual functions of sound detection and absorption
Nano EnergyJiaqi Zheng +8 more
exaly +2 more sources
Method for constructing a lightweight resistive screen for underwater sound absorption
The Journal of the Acoustical Society of America, 1983A method for preparing a resistive screen for underwater sound absorption consisting of a metallic honeycomb structure, adding a thermosetting plastic material to the cells within said structure, heating said structure under pressure and forming small apertures within said thermosetting plastic material.
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Journal of Sound and Vibration, 2012
Abstract The study of acoustic metamaterials, also known as locally resonant sonic materials, has recently focused on the topic of underwater sound absorption. The high absorption occurs only within a narrow frequency band around the locally resonant frequency.
Hao Meng +3 more
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Abstract The study of acoustic metamaterials, also known as locally resonant sonic materials, has recently focused on the topic of underwater sound absorption. The high absorption occurs only within a narrow frequency band around the locally resonant frequency.
Hao Meng +3 more
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Low-Frequency Underwater Sound Absorption of Hybrid Metamaterials Using Dissipative Slow-Sound
SSRN Electronic Journal, 2022Xindong Zhou, Mingyu Duan, Fengxian Xin
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Tunable underwater sound absorption characteristics of 0–3 piezoelectric anechoic coating
The Journal of the Acoustical Society of AmericaPiezoelectric composite materials (PCMs) with shunt damping circuits are used widely in hydroacoustics because of the flexible adjustability of their parameters. PCMs offer good underwater sound absorption, but shortcomings remain, such as poor low-frequency sound absorption, narrow bandwidth, and a single dissipation mechanism.
Xinyu Jia +4 more
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Tunable underwater low-frequency sound absorption via locally resonant piezoelectric metamaterials
Journal of Sound and Vibration, 2023Kaijun Yi, Rui Zhu
exaly