Abstract
The addition of sound absorbing materials such as fibreglass in the cavities of lightweight walls to improve sound insulation is a well-known technique. In this paper, the potential of another fibrous material, namely polyester fibre, for such applications is studied. The effect of material parameters such as mass/area, fibre type, crimpness, and binding fibre content on the sound transmission loss of a lightweight wall system has been studied. The flow resistivities of polyester fibre materials were measured to determine the suitability of an empirical prediction equation developed for fibreglass to polyester fibres. A new prediction equation relating the flow resistivity to the number of fibres/volume in the material is presented. It is also shown that the design charts for estimating sound absorption coefficients of fibrous absorbers using the flow resistivity parameter can be used to predict the absorption coefficients of polyester fibres.
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