臺灣博碩士論文加值系統

本文主要在研究被動式噪音控制法中，穿孔面板之隔音性能，從理論
上以簡易的 數學模型及合理的假設，導出穿孔面板的音響阻抗(
acoustic impedance)及其穿透損 失(transmission loss)，實驗上乃
應用單一迴響室聲音強度法，測得穿孔面板的穿 透損失。 研
究的結果顯示，630Hz以上，穿透損失的實驗測定值與理論預測值的變化
趨勢 吻合，二者在數值上的最大差異值約2dB
左右，且穿孔效應將可避免一致性效應 (coincidence)之發生。 有關
材料種類、厚度、開孔半徑、開孔率各不同影響因子 對隔音性能之影
響已於本文中討論。

This paper is to study the performance sound insulation of
perforated facings in passive noise-control method. A
simplified theory with reasonable assumptions is presentedfor
predicting the acoustic impedance and the transmission loss of
perforated facings. Measurements of transmission loss of the
perforated facings were worked out using Sound IntensityMethod
in a single reverberation room. From the result of study,
it shows that the measurements above 630Hz are in good
agreement with calculations and the maximum difference, by
nearly 2dB, of transmission loss betweenmeasurements and
calculations is obtained. It also shows that perforation can
avoid the coincidence phenomenon. The influences of different
factors such as material, thickness, diameter of perforation
and percentage of perforation transmission loss are also
discussed in this study.