The total power of forced and damped vibrations of a clamped annular plate

摘要

The sound radiation of a clamped annular plate has been analyzed in this paper. The plate is clamped to a planar, rigid baffle and is excited to vibrations under external pressure. The processes of steady state vibrations, also harmonic with respect to time, have been investigated. The analysis is basis on the complex mutual sound power of free vibrations of a plate discussed elsewhere. Such factors as forcing, internal damping of plate material and interactions of thei air column above the plate have been coupled into the equation of the plate's motion. As a result an inhomogeneous equation of the plate's motion in the form of algebraic equation system has been obtained. Its solution provides the normalized, total sound power. Some frequency characteristics have been obtained for the sound power related to the power of a model plate as well as for the mutual power of different vibration modes.