微孔水平百葉消音特性之研究

A Study on the Acoustic Performance of Micro-Perforated Absorbers in Horizontal Louvers

水平活動百葉主要的功能為遮陽並可藉由彈性調整其角度進而兼具採光、通風等效用，但都市高密度開發之下，環境噪音仍隨即進入室內，影響室內人員之舒適。本研究嘗試探討水平活動百葉之消音特性，以幾何微穿孔吸音構造作為百葉之吸音材料，取代傳統須內填多孔質材料之消音百葉，發展微孔水平消音百葉構造。本研究於國立成功大學建築系聲學實驗室，利用兩室間之室內平均聲壓位準量測法量測百葉之減音性能，本研究探討包括百葉之消音片消音長度、消音片厚度、消音片構造(單面/雙面打孔)、消音片角度、消音片間距變化等。實驗結果顯示本研究所探討變因均會對減音量造成影響，消音片長度之增加越有助於減音量之提升，而單面打孔下並配合消音片厚度之增加，減音量在全頻域皆有明顯提升，而單面打孔構造之所有試體，減音量均高於雙面打孔之試體，其中微孔水平消音百葉之平均減音量最高可達到15dB，而最低也有4dB。研究成果對於追求自然通風的永續建築趨勢中，開啟了一條可行之路。

Generally, horizontal louvers are used for shading, and the amount of daylight and ventilation can be obtained by adjusting louvers. However, the sound environment is getting worse due to highly intensive development in cities, noise from road traffic and other sources that has a substantial and growing detrimental impact on the urban environment. For this reason, this study attempts to determine the sound reduction effect of geometric micro-perforated in horizontal louvers. This study chose a new sound absorbing material called geometric micro perforated panel (GMPP). This study measured specimens at the acoustics laboratory of the Department of Architecture, National Cheng Kung University, by the standard of SPL difference, and this study discusses some of the factors, including blade length, blade width, blade angle, and air spacing. The experimental results on the acoustic performance of the horizontal louvers are strongly dependent on the experimental parameters of this study, and the sound reduction effect will increase with blade length .The experimental results show that the highest and lowest acoustic performance range between 15 dB and 4 dB respectively. The unilateral perforated type is better than the bilateral perforated type. This practical way of using geometric micro-perforated shading louvers is a step towards natural ventilation in sustainable buildings.