Dry-Wet Modal Analysis of Balance Frame for Mounting Hydrophone

Abstract

To analyze the vibration characteristics of the balance frame for mounting hydrophone in water, the resonance frequency and modal shape of the balance frame are calculated with ANSYS Workbench software. The model results are compared between the analysis environment being in the water and in the air. Two modules in ANSYS which are Model and Acoustic Extension are adapted to carry out the dry-wet modal analysis, and the first six modes are obtained. It’s indicated from the results that the wet modal frequency is at most 40% lower than the dry mode, and the influence of the interior frame is obvious.