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A BRIEF COMMENT ON THE HYDRAULIC ANALOGY OF AN ACOUSTIC WAVE IN A PIPE,
CALIFORNIA UNIV LOS ANGELES DEPT OF ENGINEERING
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The analogy between small amplitude wave propagation in shallow water and acoustic wave propagation in a uniform medium is discussed. A simplified first order theory is derived, based upon space-time techniques, in order to predict the magnitudes of the transmitted and reflected waves arising due to the incident wave encountering a small area change. Theoretical calculations agree favorably with experimental results. Photographs obtained from motion pictures of the unsteady phenomena are also presented. Author
APPROVED FOR PUBLIC RELEASE