Authors: Roman Vinokur
This paper was earlier saved in academia.com. site. But it might be also interesting to multiple readers on vixra.com. The sound transmission loss of windows at very low frequencies cannot be interpreted by the theory of infinitely large partitions. Here, the bending wave resonances are essential but not the only contributors. The low sound radiation coefficient and “niche effect” are also important. The goal is to illustrate such phenomena via simplified theoretical models and experimental results. In particular, the role of low sound radiation is interpreted using the sound radiation model of a piston inside the aperture cut in a rigid baffle between the source and receiving rooms. The “niche effect” is compared to the low-frequency sound transmission via symmetric triple windows (where the middle element is the real window and the role of the edge leaves is played by the air masses entrained at the aperture edges). In addition to the previously published results, the new experimental data are provided to support this theory in the “double-niche” case: the aperture consists of two in-series halves with different areas, and the window is installed in the smaller one. Such simple models can also be utilized to interpret the experimental sound transmission data for relatively small partitions mounted in the aperture made in a thick wall between two rooms. The paper may be helpful for students and engineers engaged in measurements of the sound transmission loss.
Comments: 8 Pages.
[v1] 2017-10-31 19:14:08
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