Results 231 to 240 of about 22,575 (260)

Low frequency sound absorption of resonators with flexible tubes

Proceedings of Meetings on Acoustics, 2013
Classically, passive acoustic liners, used in aeronautic engine nacelles to reduce radiated fan noise, have a quarter-wavelength behavior, thanks to perforated sheets backed to honeycombs (SDOF, DDOF). So, their acoustic absorption ability is naturally limited to medium and high frequencies because of constraints in thickness.
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A Theory of Low Frequency Sound Absorption in Soda-Silica Glasses

The Journal of the Acoustical Society of America, 1948
This paper deals with the theory of a class of relaxation mechanisms which may in part account for the absorption of sound in certain solids. The basic postulates of Eyring's theory of absolute reaction rates are applied to the development of general differential equations describing structural-chemical state changes.
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Geographic variation of low frequency sound absorption in the Pacific Ocean

The Journal of the Acoustical Society of America, 1979
A contour chart of the Pacific Ocean shows the variation in the boric acid sound absorption term as determined by the pH value at the SOFAR axis.
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Broadband low-frequency sound absorption of honeycomb sandwich panels with rough embedded necks

Mechanical Systems and Signal Processing, 2023
Fengxian Xin, Weitao Zhang
exaly  

Low-Frequency Underwater Sound Absorption of Hybrid Metamaterials Using Dissipative Slow-Sound

SSRN Electronic Journal, 2022
Xindong Zhou, Mingyu Duan, Fengxian Xin
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Multilayer structures for high-intensity sound energy absorption in low-frequency range

International Journal of Mechanical Sciences, 2023
Hao Gao, Yegao Qu, Junzhe Zhu
exaly  

Tunable underwater low-frequency sound absorption via locally resonant piezoelectric metamaterials

Journal of Sound and Vibration, 2023
Rui Zhu, Kaijun Yi
exaly  

An extremely-thin acoustic metasurface for low-frequency sound attenuation with a tunable absorption bandwidth

International Journal of Mechanical Sciences, 2022
Jingwen Guo, Xin Zhang, Renhao Qu
exaly  

Structural design and additive manufacturing of multifunctional metamaterials with low-frequency sound absorption and load-bearing performances

International Journal of Mechanical Sciences, 2023
Xue-Feng Zhu, Yusheng Shi, Bo Song
exaly  

Wideband low-frequency sound absorption by inhomogeneous multi-layer resonators with extended necks

Composite Structures, 2021
Jingwen Guo, Xin Zhang
exaly