Sound absorption properties of polyurethane/nano-silica nanocomposite foams

2011 ◽  
Vol 123 (4) ◽  
pp. 2384-2390 ◽  
Author(s):  
Joonmo Lee ◽  
Gue-Hyun Kim ◽  
Chang-Sik Ha
Keyword(s):  
Sound Absorption ◽  
Nano Silica ◽  
Absorption Properties ◽  
Nanocomposite Foams ◽  
Silica Nanocomposite

scholarly journals Acoustic Panels Made of Paper Sludge and Clay Composites

2021 ◽  
Vol 13 (2) ◽  
pp. 637
Author(s):  
Tomas Astrauskas ◽  
Tomas Januševičius ◽  
Raimondas Grubliauskas
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Composite Panel ◽  
Sound Absorption Coefficient ◽  
Core Material ◽  
Paper Sludge ◽  
Frequency Range ◽  
Absorption Properties ◽  
Air Gaps ◽  
The Core

Studies on recycled materials emerged during recent years. This paper investigates samples’ sound absorption properties for panels fabricated of a mixture of paper sludge (PS) and clay mixture. PS was the core material. The sound absorption was measured. We also consider the influence of an air gap between panels and rigid backing. Different air gaps (50, 100, 150, 200 mm) simulate existing acoustic panel systems. Finally, the PS and clay composite panel sound absorption coefficients are compared to those for a typical commercial absorptive ceiling panel. The average sound absorption coefficient of PS-clay composite panels (αavg. in the frequency range from 250 to 1600 Hz) was up to 0.55. The resulting average sound absorption coefficient of panels made of recycled (but unfinished) materials is even somewhat higher than for the finished commercial (finished) acoustic panel (αavg. = 0.51).

Characterisation of microstructural and sound absorption properties of porous asphalt subjected to progressive clogging

2021 ◽  
Vol 283 ◽  
pp. 122654
Author(s):  
Mohd Zul Hanif Mahmud ◽  
Norhidayah Abdul Hassan ◽  
Mohd Rosli Hainin ◽  
Che Ros Ismail ◽  
Ramadhansyah Putra Jaya ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Absorption Properties ◽  
Porous Asphalt

Optimization and Modeling of Sound-Absorption Properties of Natural Fibers for Acoustical Application

2021 ◽  
pp. 1-17
Author(s):  
Seyed Ehsan Samaei ◽  
Ebrahim Taban ◽  
Umberto Berardi ◽  
Seyyed Mohammad Mousavi ◽  
Mohammad Faridan ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Natural Fibers ◽  
Absorption Properties

Effects of water hyacinth fiber size on sound absorption properties of advanced recycled palm oil-based polyurethane foam composite

2021 ◽  
Author(s):  
Nathapong Sukhawipat ◽  
Thanathach Yingshataporn-a-nan ◽  
Tanapat Minanandana ◽  
Kitchapat Puksuwan ◽  
Laksana Saengdee ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Palm Oil ◽  
Water Hyacinth ◽  
Sound Absorption ◽  
Absorption Properties ◽  
Foam Composite ◽  
Fiber Size ◽  
Water Hyacinth Fiber

Investigations on Sound Absorption Properties of Luffa Fibrous Mats

2017 ◽  
Vol 15 (3) ◽  
pp. 445-451 ◽  
Author(s):  
G. Thilagavathi ◽  
S. Neela Krishnan ◽  
N. Muthukumar ◽  
Santhana Krishnan
Keyword(s):  
Sound Absorption ◽  
Absorption Properties

Method of Testing of Sound Absorption Properties of Materials Intended for Ultrasonic Noise Protection

2013 ◽  
Vol 38 (2) ◽  
pp. 191-195 ◽  
Author(s):  
Dariusz Pleban
Keyword(s):  
Sound Absorption ◽  
Free Field ◽  
Tone Burst ◽  
Mineral Wool ◽  
Frequency Range ◽  
Absorption Properties ◽  
Open Cell Foam ◽  
Properties Of Materials ◽  
Cell Foam

Abstract Efficient ultrasonic noise reduction by using enclosures requires the knowledge of absorbing properties of materials in the frequency range above 4 kHz. However, standardized methods enable determination of absorption coefficients of materials in the frequency range up to 4 kHz. For this reason, it is proposed to carry out measurements of the sound absorption properties of materials in the free field by means of a tone-burst technique in the frequency range from 4 kHz to 40 kHz at angles of incidence varying from 0° to 60°. The absorption coefficient of a material is calculated from the reflection coefficient obtained by reflecting a tone-burst from both a perfectly reflecting panel and a combination of this panel and the sample of the tested material. The tests results show that mineral wool and polyurethane open-cell foam possess very good absorbing properties in this frequency range.

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