Sound absorption theory for micro-perforated panel with petal-shaped perforations

2020 ◽  
Vol 148 (1) ◽  
pp. 18-24
Author(s):  
Zhimin Xu ◽  
Wei He ◽  
Xiangjun Peng ◽  
Fengxian Xin ◽  
Tian Jian Lu
Keyword(s):  
Sound Absorption ◽  
Absorption Theory

Effect of Coating Thickness on Sound Absorption Property of Four Wood Species Commonly Used for Piano Soundboards

2020 ◽  
Vol 52 (1) ◽  
pp. 28-43 ◽  
Author(s):  
Wei Xu ◽  
Xiaoyang Fang ◽  
Jiatong Han ◽  
Zhihui Wu ◽  
Jilei Zhang
Keyword(s):  
Coating Thickness ◽  
Wood Species ◽  
Sound Absorption ◽  
Absorption Property

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).

Effects of Kenaf Fiber Strand Treatment by Sodium Hydroxide On Sound Absorption

2021 ◽  
pp. 1-10
Author(s):  
Ida Norfaslia Nasidi ◽  
Lokman Hakim Ismail ◽  
Emedya Samsudin ◽  
Muhammad Ismail Jaffar
Keyword(s):  
Sodium Hydroxide ◽  
Sound Absorption ◽  
Kenaf Fiber
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