Acoustic testing and evaluation of textiles for buildings and office environments

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Performance Testing of Textiles: Methods, Technology and Applications, 2016, pp. 103 - 128
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Acoustic properties of textiles are characterized into three categories as propagation, absorption, and scattering, which are described by flow resistance, transmission loss, absorption coefficient, and scattering coefficient. The test methods for obtaining these variables are provided. For the flow resistivity measurements, a direct airflow method, an alternating airflow method, and an acoustic method are introduced; for the transmission loss measurements, the reverberant room method for measuring the random incidence transmission loss and the transfer matrix method for measuring the normal incidence sound transmission loss are discussed; for the absorption coefficient measurements, the impedance tube method for measuring normal incidence absorption coefficients and the reverberant room method for measuring random incidence absorption coefficients are given; for the scattering properties measurements, the methods for the random incidence scattering coefficient measured in a reverberation room and the directional diffusion coefficient measured in a free field are provided.
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