Results 261 to 270 of about 3,088,219 (346)

Design, fabrication and sound absorption test of composite porous metamaterial with embedding I-plates into porous polyurethane sponge

, 2021
Nowadays the use of porous polyurethane sponge (PPS) is very common for sound absorption, thanks to its light-weight feature and easy fabrication. However, in many circumstances the traditional PPS has very limited absorption capabilities, due to the ...
Nansha Gao, Liling Tang, Jie Deng, Kuan Lu, H. Hou, Kean Chen   +5 more
semanticscholar   +1 more source

Perfect low-frequency sound absorption of rough neck embedded Helmholtz resonators.

Journal of the Acoustical Society of America, 2022
In this paper, an acoustic metamaterial, composed of rough neck embedded Helmholtz resonators, is proposed to achieve perfect sound absorption in the low-frequency range.
Lei Zhang, F. Xin
semanticscholar   +1 more source

Low-frequency sound absorption of a metamaterial with symmetrical-coiled-up spaces

, 2021
A theoretical, numerical and experimental investigation of a low-frequency acoustic absorber (100–600 Hz) is reported herein. The acoustic metamaterial is based on a micro-perforated panel coupled to a multi-cavity of coiled-up spaces that is similar to ...
G. Almeida, E. F. Vergara, L. Barbosa, Ricardo Brum   +3 more
semanticscholar   +1 more source

Paramagnetic absorption of sound

Uspekhi Fizicheskih Nauk, 1961
1. Introduction 880 2. Resonant paramagnetic absorption of sound 881 3. Crystals containing ions of the iron group 881 4. Ions with an effective spin S' > 1/2 883 5. Effect on Ni2+ ions in an MgO crystal 885 6. Ions with effective spin S' = 1/2 886 7. Crystals containing ions of the rare earth elements 886 8.
S A Al'tshuler, Boris I Kochelaev, A M Leushin   +2 more
openaire   +1 more source

Experimental investigation of underwater locally multi-resonant metamaterials under high hydrostatic pressure for low frequency sound absorption

Applied Acoustics, 2021
This research develops an underwater acoustic metamaterial, which can serve to absorb broadband low-frequency underwater sound under high hydrostatic pressure ranging from 200 to 2000 Hz.
Yinghong Gu, Haibing Zhong, Bin Bao, Quan Wang, Jiuhui Wu   +4 more
semanticscholar   +1 more source

Gradient structured micro/nanofibrous sponges with superior compressibility and stretchability for broadband sound absorption.

Journal of Colloid and Interface Science, 2021
Ultrafine fibrous porous materials obtained by electrospinning technology have broad application prospects in the field of noise reduction. However, the two-dimensional fibrous membranes faced low thickness and dense structure, resulting in a single ...
Yangyang Feng, Dingding Zong, Yijie Hou, Xia Yin, Shichao Zhang, Lunyong Duan, Y. Si, Yongtang Jia, B. Ding   +8 more
semanticscholar   +1 more source

Sound absorption panel

The Journal of the Acoustical Society of America, 1986
Two pelts of fiberglass are bonded together to form a sound absorption panel. One pelt is deformed to a sawtooth shape and the teeth of the sawtooth pelts are bonded into grooves in the other pelt which is essentially flat except for the grooves.
Jerry M. Wolf, Wilbur D. Holben
openaire   +1 more source

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

, 2021
This study develops a structure with thin thickness targeting for wideband low-frequency sound absorption, which consists of multi-layer Helmholtz resonators with extended necks (HRENs).
Jingwen Guo, X. Zhang, Yi Fang, Ziyan Jiang   +3 more
semanticscholar   +1 more source

Absorption of Sound in Insulators

Physical Review, 1961
The theory of sound attenuation in structurally perfect dielectric crystals is extended and applied to recent experiments on the absorption of acoustic waves in crystalline quartz at frequencies from ${10}^{9}$ cps to 2.4\ifmmode\times\else\texttimes\fi{}${10}^{10}$ cps.
Woodruff, T. O., Ehrenreich, H.
openaire   +1 more source

Gradually perforated porous materials backed with Helmholtz resonant cavity for broadband low-frequency sound absorption

, 2021
Conventional sound absorbers can hardly own the good performance of low-frequency and broadband absorption simultaneously. In order to combine these two functions into one kind of absorbers, the gradually perforated porous materials backed with Helmholtz
Liu Xuewei, Chenlei Yu, F. Xin
semanticscholar   +1 more source