scholarly journals A numerical study of a method for measuring the effective in situ sound absorption coefficient

2012 ◽  
Vol 132 (3) ◽  
pp. EL236-EL242
Author(s):  
Erwin R. Kuipers ◽  
Ysbrand H. Wijnant ◽  
André de Boer
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Numerical Study ◽  
Sound Absorption Coefficient

Application of In Situ Method for Measuring Sound Absorption Coefficient of Direct Piercing Carved Wood Panel with Daun sireh Motif

2013 ◽  
Vol 471 ◽  
pp. 273-278
Author(s):  
Mohd Zamri Bin Jusoh ◽  
Mohamad Ngasri Dimon ◽  
Nazli Bin Che Din ◽  
Toru Otsuru ◽  
You Kok Yeow
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Sound Absorption Coefficient ◽  
Wood Panel ◽  
Natural Sunlight ◽  
Absorption Performance ◽  
Air Circulation ◽  
Lower Frequencies

An application of In-Situ method of measuring sound absorption coefficient on the surface of direct piercing carved wood panel using the concept of ensemble averaged is discussed. The method offer an easier way to measure the absorption performance for each individual aperture of carved wood panel with floral pattern which was replicated from one of the oldest mosque, namely Masjid Abidin located in Terengganu, Malaysia. Two pieces of 20 mm thick of cengal wood (Neobalanocarpus heimii) with 30% and 40% perforation ratio were respectively measured in a reverberation room in order to determine the value of . At lower frequencies (0.1 kHz-1.5 kHz), the measured values of for both direct piercing carved wood panel with floral pattern (Daun Sireh motif) are shown that the sound absoption for both direct piercing carved wood panel are in perform level. From the measurements, clearly, the installation of the direct piercing carved wood panel with floral pattern (Daun Sireh motif) in the Masjid Abidin can provide better air circulation and additional natural sunlight, as well as better sound intelligibility inside the building.

scholarly journals Design and simulation of multilayer hybrid foam material for acoustic application

2021 ◽  
Vol 12 ◽  
pp. 10
Author(s):  
L. Yuvaraj ◽  
S. Jeyanthi ◽  
Lenin Babu Mailan Chinnapandi ◽  
Elammaran Jayamani
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Noise Control ◽  
Numerical Study ◽  
Characteristic Impedance ◽  
Sound Absorption Coefficient ◽  
Metallic Foam ◽  
Polymeric Foam ◽  
Closed Cell ◽  
The Individual

New acoustic multilayer absorber fabricated by coupling closed-cell metallic foam and open-cell polymeric foam, which aimed to develop a practical use of metallic foam in the noise control application. In prior, the individual sound absorption coefficient of both foam materials with different thicknesses measured by the impedance tube method as per ASTM E-1050. Using inverse characterization technique, the intrinsic properties needed for five parameter models in a numerical study are predicted. The measured characteristic impedance, complex wave propagation, and sound absorption coefficient of the individual foams are in close agreement with the prediction. Subsequently, a different configuration of multilayer absorber is modeled using obtained properties, and their acoustic performance is evaluated. The result indicates that the coupling of polymeric foam with metallic one exhibits enhanced sound absorption and usage of closed-cell metallic foam in noise control material. Furthermore, the result demonstrates that absorption capability entirely relies on the placement of polymeric foam in the configuration. The proposed hybrid multilayer absorber coupled with test bench car for interior acoustic study, where 5–30 dB is reduction is noticed in 1/3rd octave plot.

A Numerical Study of a Method for Estimating Sound Absorption Coefficient under a Synthesized Diffuse Acoustic Field

2016 ◽  
Vol 9 (3) ◽  
pp. 1111-1116
Author(s):  
Olivier Robin ◽  
Celse Kafui Amedin ◽  
Alain Berry ◽  
Noureddine Atalla ◽  
Olivier Doutres ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Acoustic Field ◽  
Sound Absorption ◽  
Numerical Study ◽  
Sound Absorption Coefficient

scholarly journals In situ measurements of the oblique incidence sound absorption coefficient for finite sized absorbers

2016 ◽  
Vol 139 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Marco Ottink ◽  
Jonas Brunskog ◽  
Cheol-Ho Jeong ◽  
Efren Fernandez-Grande ◽  
Per Trojgaard ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Oblique Incidence ◽  
In Situ Measurements ◽  
Sound Absorption Coefficient

scholarly journals Sound absorption coefficient in situ: An alternative for estimating soil loss factors

2015 ◽  
Vol 22 ◽  
pp. 100-107 ◽  
Author(s):  
Rosane Freire ◽  
Marco Henrique Meletti de Abreu ◽  
Rafael Yuri Okada ◽  
Paulo Fernando Soares ◽  
Célia Regina GranhenTavares
Keyword(s):  
Absorption Coefficient ◽  
Soil Loss ◽  
Sound Absorption ◽  
Sound Absorption Coefficient ◽  
Loss Factors

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).

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