Measurements of Absorption Coefficients on Plates

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Abstract
An analogy to architectural acoustics is used to characterize the localized damping at boundaries of structures in terms of absorption coefficients. These coefficients can be measured by a technique which has all the advantages and disadvantages of the reverberation chamber method of architectural acoustics. Experimental results show that the way in which absorption coefficients vary with frequency is primarily a function of the geometry of the boundary structure. Structures consisting of beams attached to plates, which are of practical importance, in some cases appear to dissipate energy by virtue of friction at the interface.

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