122 Acoustic absorption characteristics of sound waves interacting with fine-scale jets

2012 ◽  
Vol 2012.22 (0) ◽  
pp. 89-92 ◽  
Author(s):  
Kei WADA ◽  
Tatsuya ISHII ◽  
Junpei MORIMOTO
Keyword(s):  
Acoustic Absorption ◽  
Fine Scale ◽  
Sound Waves ◽  
Absorption Characteristics

G-23 Acoustic Absorption Characteristics of Perforated Plate with Air Jets

2016 ◽  
Vol 2016.69 (0) ◽  
pp. 303-304
Author(s):  
Masanori MIYAZAKI ◽  
Taiki YAMAI ◽  
Hiromitsu HAMAKAWA ◽  
Eiichi NISHIDA ◽  
Toru OTSURU ◽  
...  
Keyword(s):  
Perforated Plate ◽  
Acoustic Absorption ◽  
Air Jets ◽  
Absorption Characteristics

4B3 Acoustic Absorption Characteristics of Tube Bundle and Perforated Plate with Cavity in Cross Flow

2014 ◽  
Vol 2014 (0) ◽  
pp. _4B3-1_-_4B3-2_
Author(s):  
Taiki YAMAI ◽  
HIROKI MATSUOKA ◽  
Hiromitsu HAMAKAWA ◽  
Toru OTSURU ◽  
Reiji TOMIKU ◽  
...  
Keyword(s):  
Tube Bundle ◽  
Perforated Plate ◽  
Cross Flow ◽  
Acoustic Absorption ◽  
Absorption Characteristics

Effect of Air Jets on Acoustic Absorption Characteristics of Perforated Plate with Cavity

2016 ◽  
Vol 2016.26 (0) ◽  
pp. 119
Author(s):  
Yutaro OSATO ◽  
Hiromitsu HAMAKAWA ◽  
Masanori MIYAZAKI ◽  
Eiichi NISHIDA ◽  
Eru KURIHARA ◽  
...  
Keyword(s):  
Perforated Plate ◽  
Acoustic Absorption ◽  
Air Jets ◽  
Absorption Characteristics

709 Basic Study for the Acoustic Absorption Characteristics of the Extremely Light Granular Material

2010 ◽  
Vol 2010.47 (0) ◽  
pp. 249-250
Author(s):  
Shuichi SAKAMOTO ◽  
Masaru SASAKI ◽  
Takuya MIYOSHI ◽  
Kensaku YANAGIMOTO ◽  
Seiji WATANABE
Keyword(s):  
Granular Material ◽  
Acoustic Absorption ◽  
Basic Study ◽  
Absorption Characteristics

Improvement of Fire Retardant Property of Natural Fiber

2013 ◽  
Vol 471 ◽  
pp. 261-266
Author(s):  
Sim Yeng Peng ◽  
Sin Yi Wen ◽  
Pang Zong Xin ◽  
Sharmini Jegachandra ◽  
Mohammad Hosseini Fouladi ◽  
...  
Keyword(s):  
Natural Fiber ◽  
Low Cost ◽  
Treated Wood ◽  
Ammonium Phosphate ◽  
Fire Retardant ◽  
Test Method ◽  
Acoustic Absorption ◽  
Coir Fiber ◽  
Sound Waves ◽  
Treated Fiber

Excessive exposure to noise is harmful for human health. Noise-induced hearing loss is one prevalent disorder resulted from above case. One root solution that converts the unnecessary sound waves to dissipated heat energy is acoustic absorption panel. Previous studies had looked upon potential sound-absorbing resources corresponding to natural fiber. However, several characteristics of these biodegradable supplies such as stiffness, anti-fungus and flammability are still yet to be improved. Hence, this research was undertaken to enhance the fire retardant performance of coir fiber for the production of high quality yet low cost acoustic absorption panel. Three types of additives, borax, Di-Ammonium Phosphate (DAP), and urea were investigated to perform chemical treatment for coir fiber. Experimental measurements were executed to validate the results by referring standard of ASTM E6902 (Standard Test Method for Combustible Properties of Treated Wood) by using the Fire-Tube Apparatus. Final results showed that DAP-treated fiber has the lowest percentage loss in mass of 6.67% compared to that of borax and urea-treated fiber with values of 7.60% and 9.48% respectively. This outcome clarified that DAP-treated fiber possesses higher self-extinguishing ability. Further evaluations in term of economic values, degree of hazards against health, flammability as well as reactivity supported that DAP is the best choice since its potency was ahead of the other two chemicals.

Normal incidence acoustic absorption characteristics of a carbon nanotube forest

2017 ◽  
Vol 127 ◽  
pp. 223-239 ◽  
Author(s):  
M. Ayub ◽  
A.C. Zander ◽  
C.Q. Howard ◽  
B.S. Cazzolato ◽  
D.M. Huang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Normal Incidence ◽  
Acoustic Absorption ◽  
Absorption Characteristics
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