Magalhaes, M.D.C. and Ferguson, N.S.,
Low frequency airborne sound transmission
Boone, R. (ed.)
In Proceedings of the 2001 International Congress and Exhibition on Noise Control Engineering.
Inter-noise 01., .
Full text not available from this repository.
This study focuses on the improvement in the understanding of airborne noise transmission
phenomenon in buildings, at low frequencies, under conditions of different architectural
configurations. The effects of low-frequency noise have been of a particular concern because many
kinds of structures have been inefficient in attenuating low-frequency noise, compared to other
frequency components. Likewise the Sound Reduction Index is normally measured under diffuse field
conditions and these calculations show that, at low frequencies, this is not the case. An acousticstructural
coupled room-plate-room model, which allows variations in room size and shape, and
partition properties to be considered, has been formulated and solved. Results of a parametric study
show the effect of several configurations for a flexible partition (different geometric size and position
in the common wall) and connected rooms (size and absorbing walls) on the Sound Reduction Index
by averaging over 1/3 octave bands. Finally, a general discussion, based on the findings of the results
obtained, is presented.
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