花旗松穿孔構造吸音性能之研究

A Study of Sound Absorption Construction on Perforated Douglas Fir Composite Panel

在北美軟材樹種中，花旗松（Douglas fir）以優異的強度重量比聞名世界，是加拿大最大型的樹木，這種木材的質地由細緻到中等、木紋通直、不具孔隙性，是加拿大最堅固的商用軟木之一，材質堅硬耐損、硬度強度俱佳、木紋通直、乾燥效果良好，適用於重視磨損的地方，如高架橋、橋樑組件、圓木屋以及商業建築。台灣對高吸音材料或構造之研發少有琢墨，多賴國外進口，但由於國內之亞熱帶氣候環境不同於歐美之氣候特性，因此常發生進口吸音材料或構造一到台灣便降低其吸音能力之情形，故本研究計畫基於此一研究及市場之未來性，故提出有關高吸音性之「穿孔板構造」之研發。本文主要是探討穿孔率變化、板材厚度變化、背貼材質變化對穿孔木質嵌板吸音特性之影響，冀望能掌握影響其吸音特性之因子，而實驗量測所得之數據資料亦能進一步作為噪音防治使用。

In all of the Northern American softwood breeds, Douglas fir ranked as the number one large-sized wood in Canada, furthermore, it is well known by its high compressive strength ratio. Its texture ranges from detailed to general, and withstands wear and tear. That is why Douglas fir is valued as the hardest and solidest soft wood in business usage, and is commonly adopted in constructing viaducts, bridges, and blockhouses. Most of noise absorption materials in Taiwan are imported from overseas. However, the particular climate in Taiwan is not taken into account, which results in the low-level performance of the imported materials. In this research, the perforated board architecture is studied. The number of the holes, the size of the holes, the distance of the holes, the thickness of the board, and the back sticking material of the board are studied to find out the ideal combination for future noise control.