Results 21 to 30 of about 3,850 (165)

The acoustical absorption by air-saturated aerogel powders

The Journal of the Acoustical Society of America, 2022
The acoustical behavior of air-saturated aerogel powders in the audible frequency range is not well understood. It is not clear, for example, which physical processes control the acoustic absorption and/or attenuation in a very light, loose granular mix in which the grain diameter is on the order of a micron.
Begum, H., Xue, Y., Bolton, J.S., Horoshenkov, K.V.   +3 more
openaire   +3 more sources

Acoustic Characterization of Sugarcane Bagasse Particleboard Panels (Saccharum officinarum L) [PDF]

Materials Research, 2015
The use of sugarcane bagasse minimizes the environmental impact and contributes to the creation of a new product with low density, good sound absorption capacity and can improve the acoustic conditions of buildings.
Sylvia Thais Martins Carvalho, Lourival Marin Mendes, Antonia Amanda da Silva Cesar, Jeimy Blanco Flórez, Fábio Akira Mori, Giovanni Francisco Rabelo   +5 more
doaj   +2 more sources

Broadband low-frequency sound absorption in open tunnels with deep sub-wavelength Mie resonators

Frontiers in Physics, 2022
We report both experimentally and numerically that near-perfect absorption of low-frequency sound is realized in an open tunnel embedded with two deep sub-wavelength (0.085 λ) Mie resonators. The resonators are composed of a multiple-cavity structure and
Jianping Xia, Ye-Yang Sun, Yi-Jun Guan, Yi-Jun Guan, Yin Wang, Yu-Jing Lu, Hui-Gang Hu, Yong Ge, Yong Ge, Hong-Xiang Sun, Hong-Xiang Sun, Shou-Qi Yuan, Yun Lai, Xiao-Jun Liu, Xiao-Jun Liu   +14 more
doaj   +1 more source

Subjective Effects of Sound Absorption and Investigation of Reverberation Times in Modern Japanese Dwellings

Applied Sciences, 2021
This study aimed to reveal the influence of sound absorption in general dwellings on the subjective evaluation of acoustics. First, a subjective experiment was conducted using a full-scale room model. The results indicate that the feelings of silence and
Kazuma Hoshi, Toshiki Hanyu, Ryoichi Suzuki, Daisuke Watanabe   +3 more
doaj   +1 more source

Low-Frequency Dual-Band Sound Absorption by Ultrathin Planar Wall Embedded With Multiple-Cavity Resonators

Frontiers in Physics, 2022
We report the numerical and experimental realization of a type of ultrathin planar wall with low-frequency dual-band sound absorption. The proposed planar wall is constructed by a periodic subwavelength unit cell (with a thickness of λ/19) which consists
Yu-wei Xu, Yi-jun Guan, Yi-jun Guan, Yi-jun Guan, Jia-li Yin, Yong Ge, Hong-xiang Sun, Hong-xiang Sun, Shou-qi Yuan, Xiao-jun Liu, Xiao-jun Liu   +10 more
doaj   +1 more source

Bilayer ventilated labyrinthine metasurfaces with high sound absorption and tunable bandwidth

Scientific Reports, 2021
The recent advent of acoustic metamaterials offers unprecedented opportunities for sound controlling in various occasions, whereas it remains a challenge to attain broadband high sound absorption and free air flow simultaneously.
Jiayuan Du, Yuezhou Luo, Xinyu Zhao, Xiaodong Sun, Yanan Song, Xinhua Hu   +5 more
doaj   +1 more source

Effective acoustic absorption of ETFE membranes and cushions

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023, 2022
In this paper, we report on measurements of the acoustic absorption coefficient of ETFE membranes and cushions by two types of measurement approaches. The experimental results are compared with material simulations in ODEON® room acoustics ver.17. The absorption was determined via the assumption that the energy which passes through the foil can be ...
Gharibian Lavasani, Sayyed Majid, Sluyts, Yannick, Jun, david, Chmelik, Vojtech, Rychtarikova, Monika, Glorieux, Christ   +5 more
openaire   +3 more sources

Absorption and Enjoyment During Listening to Acoustically Masked Stories [PDF]

Trends in Hearing, 2020
Comprehension of speech masked by background sound requires increased cognitive processing, which makes listening effortful. Research in hearing has focused on such challenging listening experiences, in part because they are thought to contribute to social withdrawal in people with hearing impairment.
Bjorn Herrmann, Ingrid Johnsrude
openaire   +5 more sources

Constrained least-squares and maximum-likelihood calibration of absorption coefficients in reverberation time equations

Acta Acustica
Calibration of material properties in room acoustics simulations is essential to producing realistic results. However, the number of available algorithms for calibrating room acoustics models remain limited. This work presents two methods for calibrating
Bellows Samuel D., Katz Brian F. G.
doaj   +1 more source

Acoustic properties of green walls: Absorption and insulation [PDF]

Proceedings of Meetings on Acoustics, 2016
In the past few decades, the issue of environmental quality in the urban environment is a recurring theme. Green walls and roofs have demonstrated great efficiency in the attenuation of adverse effects such as heat islands. The thermal characterization of these systems are well studied, however few studies have been carried out on their acoustic ...
Rodolfo Thomazelli, Fernando D. N. Caetano, Stelamaris R. Bertoli   +2 more
openaire   +1 more source