Abstract

An analytical model of an elastic coating attached to a submerged thin plate has been developed. A plane acoustic wave is incident from the water on to the elastic coating. The normal and tangential velocity components induced in the coating by the acoustic wave are calculated. The effects of incidence angle, frequency, location throughout the coating, and coating properties on the response velocity components are evaluated and examined. Many details of the dynamic response are explained based on simple uncoupled waveguide characteristics of the elastic coating. Typically, the normal velocity components in the coating are several tens of decibels higher in amplitude than the tangential velocity components. Results showed, however, that the tangential velocity component could be increased by an average amount of about 20 dB, without serious degradation of the normal component, by altering the coating elastic properties. In particular, combinations of high longitudinal wavespeed and low shear wavespeed were found to be advantageous. The effects of an outer plate on the compliant coating velocity response components are also presented.

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