Sound Absorption Performance of Green Walls Constructed with Wood Plastic Composites

• Main Authors: Lan-Ting Chang, 張嵐婷
• Other Authors: 張豐丞
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/82g7p4

碩士 === 國立臺灣大學 === 森林環境暨資源學研究所 === 106 === Recycled plastic based wood plastic composites (rWPCs) is expected to replace conventional high carbon foot print materials. To expand the application field of rWPCs, considering its porous structure, the acoustic properties of rWPCs have been examined. Also, rWPCs has sufficient mechanical strength, therefore was applied as supporting system for living wall system (LWS) to create sound absorption element with low environmental impact in this study. First, the sound absorption coefficient of rWPCs and its combination with several common acoustic mountings was measured by impedance tube. Second, selected rWPCs and LWS with rWPCs integrated as supporting system were tested in reverberation room for understanding their sound absorption performance within a practical scale. It was found that rWPCs had medium sound absorption property at mid-low frequency range with its hollow structure beneficial to lighter design, while decoration or functional surface patterns were both favorable for sound absorption. On the other hand, the result of acoustic mountings suggested that air gap less than 3 cm and perforation area of less than 1% would be sufficiently effective for rWPCs sound absorption improvement. At last, LWS with rWPCs as supporting system was successful combination for full frequency range sound absorption, and for acoustic purpose, it would be necessary to take supporting system into account as well as garden module design and coverage rate.