Title: The effective mass of a granular medium: implications for the attenuation of structure borne sound

Author (Invited): John Valenza, Schlumberger-Doll Research

Abstract:

Attenuating structure borne sound with a granular medium is a technique that has potential for application in many industries, such as: consumer electronics, automobiles, and fossil fuel production. In this talk we investigate the effective mass of a granular medium, the main property used to assess the capacity of the material for attenuation. In particular, we will show that liquid films adsorbed in the vicinity of grain contacts play a central role in governing the capacity for attenuation. Accordingly, we analyze the physical origin for dissipation in the contact region, and test the predictions of our analysis using liquids of varying viscosity. The implications for the attenuation of structure borne sound are considered.

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