Absorption of Sound Wave by Fabrics:Part 3 : Flow Resistance

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To investigate the influence of the flow resistance of fabrics on the absorption characteristics of fabrics, we have measured the flow resistance and absorption characteristics of 13 def ferent kinds of cotton fabrics with these results: (1) The relation between the flow resistance Rf of fabrics and the flow velocity V is given as follows : Rf = Ai + Bi V where Ai and Bi are constants decided by the design and density of a fabric. In a range of small densities, the value of Bi is nearly zero and the values of Ai and Bi increase together as the density of a fabric increases. (2) There are two types of absorbing mechanisms among fabrics, i.e., the viscosity resistance type and the resonance type. If the flow resistance of a fabric depends on only air viscosity, namely, Rf = Ai, the fabric is of the viscosity resistance type. (3) If a fabric regarded as of the viscosity resistance type as a rear air space, the relation among the frequency f0 which shows the maximum absorption coefficient, the depth d of the air space and Rf is given as follows : f= (c/4 - ai Rf) d- 1 where c is the sound wave velocity and ai is a constant decided by the design of the fabric . This empirical formula means that the fabric has the maximum absorption coefficient when it is sset at a shorter distance than the place where the particle velocity is a maximum . The relation beetween the maximum absorption coefficient α ∞ and Rf is: α ∞ = a'i Rf where a'i is a constant decided by the design of the fabric.
社団法人日本繊維機械学会の論文

Absorption of Sound Wave by Fabrics:Part 3 : Flow Resistance

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