![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
ABSTRACT
During the last few years remarkable efforts were taken for the development of natural sound-absorbing material. Recent advances in acoustic materials lead to a variety of natural sound-absorbing materials like jute, arenga pinnata, hemp, corn husk, to name a few. This article speaks for the sound absorption characteristics of coconut coir fibers with polyurethane resin. Results of this study revel sound-absorbing characteristics of coconut coir fiber and polyurethane resin with the help of impedance tube setup as per ISO 10534–2 and ASTM E1050-98 standards for the frequency range 100–5000 Hz. The acoustic performance of coconut coir fiber is measured by the addition of polyurethane resin with varying weight percentages such as 10%, 20%, 30%, and 40%. The absorption coefficient of 0.95 is achieved at high frequency 3200 Hz for 40 mm thickness with 70% fiber and 30% resin composition without air gap which is comparable with many synthetic materials. Same sample exhibit better result in comparison with another sample for low and medium frequency region showing a sound absorption coefficient of 0.4 (100–500 Hz) and 0.81 (500–1900 Hz). Finally, alongside the effect of the air gap of 0 mm, 10 mm, 15 mm, 20 mm, and 30 mm on sound absorption coefficient were measured.
摘要
近几年来，我国大力发展天然吸声材料. 声学材料的最新进展导致了各种各样的天然吸声材料，如黄麻、羽绒、大麻、玉米壳等等. 本文针对椰子椰壳树脂吸声纤维的特点. 研究结果揭示了椰子椰壳纤维和聚氨酯树脂的吸声特性，并根据ISO10534-2和ASTME1050-98标准在100-5000hz的频率范围内设置阻抗管. 通过添加10%、20%、30%和40%的聚氨酯树脂对椰子壳纤维的声学性能进行了测试. 采用70%的纤维和30%的树脂组成，无气隙，在3200hz的高频下，吸收系数达到0.95，与许多合成材料相当. 同一样品在中低频区的吸声系数分别为0.4（100-500hz）和0.81（500-1900hz），与其他样品相比，具有更好的效果. 最后测量了空气间隙为0mm、10mm、15mm、20mm和30mm对吸声系数的影响.
Declaration of interests
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.