School of Applied Sciences, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia.
J Acoust Soc Am. 2010 Feb;127(2):841-9. doi: 10.1121/1.3273889.
This paper presents a revised theory for predicting the sound insulation of double leaf cavity walls that removes an approximation, which is usually made when deriving the sound insulation of a double leaf cavity wall above the critical frequencies of the wall leaves due to the airborne transmission across the wall cavity. This revised theory is also used as a correction below the critical frequencies of the wall leaves instead of a correction due to Sewell [(1970). J. Sound Vib. 12, 21-32]. It is found necessary to include the "stud" borne transmission of the window frames when modeling wide air gap double glazed windows. A minimum value of stud transmission is introduced for use with resilient connections such as steel studs. Empirical equations are derived for predicting the effective sound absorption coefficient of wall cavities without sound absorbing material. The theory is compared with experimental results for double glazed windows and gypsum plasterboard cavity walls with and without sound absorbing material in their cavities. The overall mean, standard deviation, maximum, and minimum of the differences between experiment and theory are -0.6 dB, 3.1 dB, 10.9 dB at 1250 Hz, and -14.9 dB at 160 Hz, respectively.
本文提出了一种修正的双层空腔墙隔声预测理论，修正了通常在推导双层空腔墙隔声高于墙叶的临界频率时由于空气声在空腔内的传输而采用的近似值。该修正理论也可用于墙叶的临界频率以下的修正，而不是 Sewell 修正[(1970). J. Sound Vib. 12, 21-32]。当模拟宽空气隙双层玻璃窗时，发现需要包括窗框的“立柱”声传输。对于弹性连接（如钢立柱），引入了立柱传输的最小值。本文还推导了预测无吸声材料的空腔有效吸声系数的经验方程。该理论与双层玻璃窗和带有和不带有空腔吸声材料的石膏板空腔墙的实验结果进行了比较。实验与理论之间的差异的总体平均值、标准差、最大值和最小值分别为-0.6dB、3.1dB、10.9dB（1250Hz）和-14.9dB（160Hz）。
