木質擴散板構造及形狀變化對聲音散射特性之影響

The Sound Scattering Properties of Wooden Diffusers used Different Structures and Shapes

林芳銘 ； 葉柏宏 ； 洪培瑜 ； 江哲銘 ； 賴榮平

《中華民國音響學刊》 13期 (2008/11) Pp. 25-32

https://doi.org/10.30049/JASRC.200811.0003

摘要

室內裝修構造之聲能散射特性為室內聲場擴散性能之重要影響因素之一，良好的裝修材散射性能有助於提升室內聲學環境品質。本研究參考ISO17497-1之量測方法，於實驗室建置試材隨機入射散射係數自動量測系統，探討木質擴散板之聲音散射性能。以柳杉材、合板擴散板為試材，探討其不同構造變因對於散射性能之影響。結果顯示，在測試條件方面，當底板加上與試材構造深度相等之鏡面邊框能改善邊緣效應產生之影響。本研究進一步探討有、無翼板對擴散板散射性能之影響，結果顯示，有翼板之散射性能比無翼板佳，另依方面增加擴散板溝槽深度可獲得之較大之散射係數頻帶範圍。

關鍵字

木質擴散板 ； 散射係數 ； 邊緣效應

並列摘要

Interior decoration for the scattering performance is very important, especially to build a good sound field in the interior environment. This study consult ISO 17497-1 standard (2004) to test the scattering coefficients in reverberation lab. There are three different wooden materials used to change structures and shapes for getting scattering coefficients of different type models. Add the reflection frame on the base turntable could reduce the edge effect, and this study also test the effects of add flutter or not add flutter what scattering coefficients will be on three different test samples. The result exhibits add flutter better than no flutter. It could get the better scattering frequency width when the groove of diffusers more and more deep, this result also prove the groove more deeper what can handle lower frequency level.

並列關鍵字

Wooden diffuser ； Scattering-coefficient ； Edge effect