ABSTRACT The paper reviews a theory of sound propagation in fibrous absorbers such as glass wool. The theory is based on physical principles and uses no ad hoc parameters. From mean distance between fibres and their diameters, it predicts the acoustical properties of the absorbers with sufficient accuracy for use in practice. It is shown that the theory agrees with the well known formulas of Delany and Bazley. The theory has been confirmed by measurements on glass wool.
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