The Study on Sound Insulation of Perforated Facings

• Main Authors: Jan, Shu Hui, 冉淑慧
• Other Authors: Kuo Tzay Chen
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/17369767705381731193

碩士 === 國立臺灣大學 === 造船工程學系 === 85 === This paper is to study the performance sound insulation of perforated facings in passive noise-control method. A simplified theory with reasonable assumptions is presentedfor predicting the acoustic impedance and the transmission loss of perforated facings. Measurements of transmission loss of the perforated facings were worked out using Sound IntensityMethod in a single reverberation room. From the result of study, it shows that the measurements above 630Hz are in good agreement with calculations and the maximum difference, by nearly 2dB, of transmission loss betweenmeasurements and calculations is obtained. It also shows that perforation can avoid the coincidence phenomenon. The influences of different factors such as material, thickness, diameter of perforation and percentage of perforation transmission loss are also discussed in this study.