現場量測隔音指標與吸音係數之分析

本文主要探討在建築以及道路工程現場上已相當普遍之防音材的隔音特性與吸音特性。防音材料能否發揮其聲學之基本隔音性質和吸音效果，必須經過標準實驗室進行穿透損失隔音量測與迴響室或駐波管之吸音率的聲學檢測外；本文引用了歐聯現場量測技術EN1793-5：道路交通噪音之空氣音隔音與反射係數檢測技術，探討建材被實際安裝後呈現的效果。建立一套完善的實驗系統設備，採用現場量測法主要在脈衝響應下的時域訊號進行分析，以最大長度序列訊號MLS為標準音源，文中使用了Adrienne時間權窗與訊號刪減技術，計算隔音指標與吸音係數，並與實驗室法的結果進行比較，可得到材料在現場佈置與實驗室環境下表現的防音效果，與兩種量測結果之相對關係。

關鍵字

最大長度序列訊號；隔音指標；吸音係數

並列摘要

This paper is to study the sound insulation and sound absorption of acoustic materials which is used to buildings and roadway engineering. In order to understanding the acoustic insulation materials property, the acoustic measurement experiments must be carried out in the standard laboratory. The measurement values are sound transmission loss and the sound absorption coefficients with a reverberation room method or the impedance tube method. Also, in this thesis quote the norm prCEN/TS 1793 Road Traffic Noise Reducing Devices-Test Method for determining the acoustic performance-Part 5:Intrinsic characteristics-In situ values of sound reflection and airborne sound insulation , we can confer the material effect which is installed actually.The in-situ measurement is an analysis that produce an impulse response with the temporal signal, use a maximum-length sequence (MLS) as the standard test signal, we also join the Adrienne temporal window and signal subtraction technique to calculate the values of sound insulation index and sound absorption. The comparison and discussion are finished with the results of experimentation in laboratory. We can understand the effects of reducing noise that the materials is at the scene and the laboratory, and also can get the relative relation between the both results.

並列關鍵字

maximum-length sequence (MLS) ； sound insulation index ； sound absorption

國際替代計量

現場量測隔音指標與吸音係數之分析

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