Article

A Theoretical Investigation on Sound Transmission Loss through Multi-walled Plates with Air Space

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Abstract

In this study, an analytical model is proposed to investigate the sound transmission loss through multi-walled plates with air layers or decompression air layers, under the diffuse incidence field. Using the present approach, the influences of various parameters, such as the wall thickness, the decompressed air and the thickness of air space, on the sound transmission loss through are simulated and discussed in detail. It is seen that, due to the wave frequency of mass-air-mass resonance between double-walled glass plates, the sound transmission loss of the plates can be improved at low frequency range. The sound transmission loss tends to increase with decreasing air pressure because the sound is not transmitted through vacuum space. The design method can be used to investigate the effect of various geometric and material parameters on the sound transmission loss. The advantage of the simulation procedure is easily used for designing the layer structures with different parameter to improve the sound insulation effect.

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... Acoustic protection of spaces intended for human presence and work as well as vehicles is a very broad subject and it is described many times in scientific and technical literature. Analogically, the method of determining acoustic insulation of rooms is widely described in literature [10][11][12]. Measurement procedures of acoustic insulation of building walls, rooms and soundproofing materials are developed by laboratories dealing with widely understood acoustics and are based on recommendations of European standards series EN ISO 140. These standards take into account the size of partition, acoustic characteristics of rooms as well as the influence of lateral transmission on the decrease of acoustic insulation by measuring vibrations of construction elements. ...
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