Explanation for Fluid Effect on Flexural Vibration of a Finite Submerged Cylindrical Shell with Modal Added Mass

Abstract

By assuming the fluid to be ideal acoustic media, the sound-structure interaction model is built for a finite submerged cylindrical shell. Modal added mass is proposed by combining added mass theory and modal shape of structure, and it’s successfully applied to explain the influence mechanism of acoustic media on structural vibration. Modal added masses for a submerged cylindrical shell are general positive for every mode, this will finally lead to the reductions of coupled modal frequencies. Modal added mass is closely related to mode shape of stricture, and it generally reduces when the structural mode order becomes bigger. This work provides new idea to explain the influence of acoustic media on dynamic characteristics of submerged structures.