雙層板隔音性能之研究

本文主要探討雙層板之隔音性能，然而在實際製作雙層板以及實驗量測中，兩個面板間需要利用支架來互相連接。本文利用統御方程式，首先列出雙層板之振動方程式，而對於中間支架結構部分視為彈簧來計算，其中需特別注意彈簧之剛性值，根據文獻可以發現，隨著入射頻率之不同，相對彈簧剛性的大小也不相同，因此以文獻所提出的彈簧剛性值之分布作為依據，選擇出剛性值與頻率的關係曲線，代入理論計算來模擬支架式雙層板之隔音性能。為了驗證本文之理論，將以往學界所發表的文獻模擬和以及實驗數據之隔音曲線，與本文理論計算互相比對後，結果大致符合，可證明本文理論之可行性。接著以此理論針對支架式雙層板的隔音量探討，藉由改變參數，如面板的厚度、密度，或是支架的厚度和間距以及加入多孔材料等，探討各參數的變化對於隔音性能的影響。分析後發現，板材厚度的變化會改變吻合效應所發生的頻率，進而影響整體之隔音性能。最後由理論分析可知支架式雙層板加入多孔材料後，可將隔音量提升5 dB左右。

關鍵字

隔音性能；雙層板；支架；吻合效應；彈簧剛性

並列摘要

The purpose of this research is to discuss the sound insulation of double-leaf panel. In the actual production of panels and experimental measurements, the middle part of the double-leaf panel needs to be connected by studs. Then the way of connection divided of points and line. The sound insulation quantity of different connection methods is not the same. In this thesis, we use the governing equation to simulate the sound insulation performance of double-leaf panel, while the middle structure is simulated by springs. With the difference of the incident frequency, the stiffness of the spring is also different. Based on the literature proposed to distribution of spring stiffness values, into the theoretical calculation to simulate the sound insulation performance of double-leaf panel. To order to verify the present method, citing data measured by NRCC. The comparison of the transmission loss between experimental data and numerical predictions is reliable. Using the present method, several cases are set up to investigate related parameters of double-leaf panel, such as thickness, density, stud spacing, distance between two panels and add some porous between two panels. The numerical results show that the coincident frequency will change with different thickness of the panel. Finally, theoretical analysis show that add porous to the structure can increase the sound insulation by about 5 dB.

並列關鍵字

sound insulation ； double-leaf panel ； stud ； coincidence ； stiffness

參考文獻

[1] E. C. Sewell, ‘‘Transmission of reverberant sound through a single-leaf partition surrounded by an infinite rigid baffle,’’ J. Sound Vib. Apr., 21-32, 1970.