Results 101 to 110 of about 194,541 (227)

SOUND ABSORPTION PROPERTIES OF TROPICAL PLANTS FOR INDOOR APPLICATIONS

, 2014
The paper presents the experimental results of sound absorption coefficient measurements of several tropical plants, including fern, baby tears, begonia, maidenhair fern and ivy. All these plants live in tropical underbrush in conditions of low lighting,
ASDRUBALI, Francesco, Francesco D’Alessandro, Nicholas Mencarelli   +2 more
core  

Sound Absorption Properties of Shredded Paper Wastes as Indoor Building Sound Absorber

BioResources
The sound absorption properties of shredded paper wastes (SPW) were evaluated. Two impedance tubes (large and small) were used to measure the sound absorption coefficient of different thicknesses of SPW sound-absorber (20, 40, 60, 80, and 100 mm). As the
Eun-Suk Jang, Hee-Jun Park
doaj  

Utilization of Disposable Mask Waste and Coconut Fiber as an Acoustic Composite Material

Dimensi: Journal of Architecture and Built Environment
This research aims to utilize disposable mask waste and coconut fiber as an acoustic composite material and identify its sound absorption characteristics. The method used in this research is an experiment to produce four samples with different non-woven
Khairunnissa Ramadhani, Arrizal Abdul Aziz, Miftahul Akbar Ramadhan, Amara Huaida Alifah, Try Ramadhan   +4 more
doaj   +1 more source

Rigid-Frame Porous Material Acoustic Attenuation on Compressor Discharge

, 2012
Standards have limited the allowable noise levels in different situations, requiring the study of solutions at the source, in the path or the receiver. Muffler is the major factor influencing the noise of rotary compressor.
Mareze, Paulo Henrique, Pellegrini, Claudio, Lenzi, Arcanjo   +2 more
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Estimating sound absorption coefficient under various sound pressure fields by combining an automated test bench to sound field reproduction and advanced post-processing techniques

, 2022
The absorption coefficient of sound absorbing materials is usually obtained via impedance tube or reverberant room measurements. While impedance tube tests are restricted to normal incidence on small samples, reverberant room tests provide diffuse field ...
Dupont, Thomas, Berry, Alain, Robin, Olivier, Sgard, Franck, Sciard, Magdeleine   +4 more
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Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples

Archives of Acoustics, 2013
This paper presents the results of measurements of the sound absorption coefficient of auditorium seats carried out in the laboratory using two methods.
Jarosław RUBACHA, Adam PILCH, Marcin ZASTAWNIK   +2 more
doaj  

Acoustic Absorption Coefficient of Oil Palm Midrib Composite

Jurnal Fisika Flux
Composite from oil palm midrib waste is one of the natural fiber materials that can reduce noise. Its material sample composite with gypsum was placed inside an impedance tube, which fitted with the mass of palm midrib mill, i.e., 0.1 kg, 0.15 kg, and 0 ...
Defrianto Defrianto, Muhammad Ahlunnazah, Saktioto Saktioto, Nuraina Fika Lubis   +3 more
doaj   +1 more source

On the sound absorption coefficient of porous asphalt pavements for oblique incident sound waves [PDF]

, 2014
A rolling tyre will radiate noise in all directions. However, conventional measurement techniques for the sound absorption of surfaces only give the absorption coefficient for normal incidence.
Wijnant, Ysbrand H., Bekke, Dirk, de Boer, Andries, Bezemer-Krijnen, Marieke   +3 more
core  

Theoretical Estimation of Wheat Straw Sound Absorption Coefficient Using Computed Tomography Images

Applied Sciences
Wheat straw, which is a by-product of wheat production and has a tubular structure, is typically used for animal feed and compost. This study estimated the sound absorption coefficient of wheat straw based on cross-sectional computed tomography (CT ...
Shuichi Sakamoto, Kohta Hoshiyama, Yoshiaki Kojima, Kenta Saito, Zulhafiz Syazmi Bin Roslan   +4 more
doaj   +1 more source

Measurement of Sound Absorption Coefficient in Impedance Tube

The sound absorption coefficient is one of the most common quantities describing the acoustic behaviour of materials and structures intended for use in room acoustics.
Jun, David, Nespěšný, Ondřej
core   +1 more source