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- W2034260275 abstract "An experimental technique is presented for the determination of normal acoustic properties in a tube, including the effect of mean flow. White noise is used to produce a randomly fluctuating sound field and two stationary, wall-mounted microphones measure the sound pressure at arbitrary but known positions in the tube. Theory is developed, including the effect of mean flow, showing that the incident- and reflected-wave spectra, and the phase angle between the incident and reflected waves, can be determined from measurement of the auto- and cross-spectra of the two microphone signals. Expressions for the normal specific acoustic impedance and the reflection coefficient of the tube termination are developed for a random sound field in the tube. Three no-flow test cases are evaluated using the two-microphone random-excitation technique. Comparison is made between results using the present method and approximate theory and results from the traditional standing wave method. In all cases agreement is very good. [Research conducted at Purdue University, Lafayette, IN.]" @default.
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- W2034260275 date "1977-12-01" @default.
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- W2034260275 title "Experimental determination of acoustic properties using a two-microphone random-excitation technique" @default.
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- W2034260275 doi "https://doi.org/10.1121/1.2016268" @default.
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