The Vibration of an Internally Damped Sandwich Plate Radiating Into a Fluid Medium

Abstract

An analysis is given for the vibration of a long sandwich plate with linear internal damping properties. The plate is subjected to a time-harmonic pressure loading of constant amplitude and is considered vibrating both in vacuo and in an environment consisting of vacuum on one side and a fluid medium on the other. Numerical results are presented for both a conventional and a highly damped sandwich plate. The conventional (aluminum honeycomb) sandwich plate produces only a small amount of damping, but when the honeycomb core is replaced by a highly dissipative thermoplastic, the maximum deflection and stress at resonance are reduced theoretically by about two orders of magnitude.