室內裝修建材之吸音能力為影響室內迴響時間的重要因子，吸音材料可提供降低室內環境噪音及提升室內聲學品質，以創造舒適的室內聲環境，常見手法為多孔質吸音材料、穿孔板共振吸音構造及板共振吸音構造。回顧國內外相關吸音構造之研究，多為單一材料及複合式構造，如穿孔板作為表面材料搭配多孔質填充材或搭配蜂巢板等。然而，文獻指出多孔質填充材在未包覆狀況下，因材料劣化剝落產生粉塵並經由空氣傳播影響使用者身體健康。
建築材料中，金屬材料具有可塑性高、耐候性佳、剛性高及回收再製等優點，故相關產品常見於建築外殼、屋頂等室外環境，較少大量應用於室內。微孔板為常見之金屬裝修材料，除了具備以上基本特性外，更透過本身細小的孔隙達到高吸音能力，但製造工序複雜及成本較高。因此，本研究聚焦於具有孔隙特性之金屬擴張網，進行室內吸音建材之產品開發。
本研究主要分為二部分，第一部分為多孔質搭配穿孔板共振結構，從單板吸音構造、盒狀吸音構造到摺板吸音構造，共有三個實驗室量測階段，利用每階段之結果進行下階段之試體設計，討論構造的尺寸、形狀及空氣層之搭配，統整最佳之摺板吸音構造。第二部分為薄膜搭配穿孔板之共振吸音結構，以構造尺寸及空氣層作為變因進行材料設計，討論複合式材料吸音構造之吸音性能，並將最佳之構造組合裝置於實場空間，進行材料裝設前後之室內聲學實測，依各項聲學指標之比較與分析。
由單板金屬擴張網之研究結果發現，板材本身對於吸音性能之影響，孔中心距離比起板厚影響更大，且需填充材料以達到高吸音性能。雙層的盒狀構造於不填充多孔材料且有空氣層之條件下，α_w達0.70 ~ 0.80。考量材料結構，發展出摺板構造且不填充多孔材料時，α_w可達0.65~ 0.85。顯示金屬擴張網能有效運用本身的孔隙及雙層板構造的優勢，達到中頻以上的高吸音性能。同時本研究針對吸收低頻進行金屬擴張網與油畫布之板膜複合共振吸音構造研究，結果顯示α_s於100 Hz ~ 250 Hz達0.6以上，更於125 Hz達0.8。
最後，摺板構造與板膜複合共振吸音構造於實場驗證之結果顯示，鋪設47.8 %天花板面積之摺板構造可使辦公室迴響時間下降約0.25 s ~ 0.46 s，且有效提升清晰度；裝設1.6 %總表面積之板模複合構造可使演講空間之迴響時間於125 Hz及250 Hz下降0.27 s及0.16 s，有效降低低頻噪音。經由材料設計、吸音係數量測至實場驗證，顯示金屬擴張網能搭配不同材料、不同構造展現全然不同之吸音特性，更能因應不同空間之使用需求，有效提供及改善空間所需之聲學環境。

The sound-absorbing material concerns, which is an important factor control, the reverberation time (RT), improves room acoustic and comfort environment. The porous material and porous with the board of multi-layer structure, which commonly used to sound-absorbing material. In the market, sound-absorbing building materials used porous sound-absorbing materials and a composite structure of porous materials with panels as a common method. Uncovered porous sound-absorbing materials, which exposed and spread into the air, are affecting body health. Therefore, using materials covered surface for less effusion problem, which metal material become building material and applied to indoor renovation, in the recent year.
Among building materials, metal materials have the advantages of high plasticity, good weather resistance, high rigidity, and recycling. Micro-Perforated plate (MPP) is a common metal interior material. In addition to the above basic characteristics, MPP achieves high sound absorption via lots of small pores, but the manufacturing process is complicated and high cost. Therefore, this research focuses on the development of indoor sound-absorbing building materials via expanded metal mesh (EMM), which low cost.
This research proposes two sound-absorption structure for target different frequency via laboratory measurement, which developed expanded metal mesh with folding structure (EMMFS) and panel membrane resonance absorber (PMRA). The result of measurement is discussed using CNS 15218 (ISO 11654) to evaluate the α_w in 82 test specimens.
The results show that the hole center distance has a greater influence than the plate thickness, which the box structure with air layer, then under the condition without porous material, the α_w is 0.70 to 0.80. Considering the specimen structure, the folded structure without porous material is developed, which α_w is 0.65 to 0.85. It shows EMM has the potential to achieve high-performance sound absorption, which above the intermediate frequency. Then, its composite resonance sound absorption structure of EMM and canvas is carried out, which α_w is above 0.6 at 100 Hz to 250 Hz, and 125 Hz is reach 0.8.
Furthermore, using the folding structure specimen could reduce the RT from 1.05 s to 0.56 s, which is layout 47.8% of the ceiling in the office. Also, installed 1.6% of the total surface of speech room, the RT reduce to 1.47 at 125 Hz, 1.37 s at 250Hz via PMRA. This demonstrates that using EMMFS and PMRA could reduce RT and rise the room acoustic.

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