The effects of lumped mass attachments on vibro-acoustic behavior of a fluid-loaded plate

Abstract

The effects of attachments on the dynamics of a master structure are of fundamental significance. In this study, the changes in the vibro-acoustic behavior of a fluid-loaded plate due to variations in lumped mass attachments are examined. The finite element for modeling the structure with lumped mass attachments is coupled with the Rayleigh integral for the acoustic fluid to solve the structure–fluid interaction problem and to obtain the response of the coupled system. The changes in the modal parameters due to the variations in attachments are determining from a model reduction method. The Monte Carlo simulation is used for the uncertainty analysis of the vibro-acoustic behavior. Both the mean and the standard deviation of the changes attributable to the attachments are discussed. A baffled plate with water loading/air loading is involved in the study. The numerical results show that the effects and the changes-in-impedance on the master plate due to the attachments vary with the frequency spectrum.