Abstract
The authors have carried out a systematic study of the accuracy in the impedance eduction of liners in “interferometer with flow” rigs in the absence of grazing flow. A method is proposed for determining the confidence interval of sound pressure measurements for such a rig. The analytical model of sound propagation in a rectangular duct in the presence of impedance transitions, previously proposed by the authors and described with the Wiener–Hopf method, is experimentally confirmed. A method is developed and implemented for impedance eduction of liners in the absence of flow, based on an analytical method that takes into account the passage of sound modes through the impedance transition.
Published Version
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