Research of Acoustical Characteristics of Sound-Absorbing Material Covering Fiber Fabric

• Main Authors: Huang, An-Jiun, 黃安均
• Other Authors: Liou, Der-Yuan
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/53abse

碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 102 === Today, under this living environment of concentrated community society, it is important to prevent people from interference of noise. Prevention of noise can be achieved normally by reducing sound level of noise source and cutting off the transmission path. In order to reduce the noise, acoustic absorption material can absorbs and decays sound wave propagation energy. Fiberglass cotton is the most common acoustic material, which has characteristics of incombustible, incorruptible, and non-erodible. However, it has defects of fragile fiber, dust appearance, and indecomposable. Therefore, we usually use fiber fabric to cover this acoustic cotton which could prevent environment pollution. This also has utility to control reverberation time and speech intelligibility clarity etc. This study focuses on investigating the analysis of acoustic characteristics of acoustic material covered by fiber fabric. We combine different physical properties fiber cotton and different density of fiberglass cotton to do the comparison in sound absorption coefficient, then analyze and compare the relation of characteristics. The sound absorption experiment included impedance tube method and reverberation room method. While other physical properties test included light transmission rate, pore rate, water absorption rate, and water absorption speed etc. The results indicate that fiber fabric has notable effect on sound absorbance.