Numerical Analysis of Acoustic and Vibration Characteristics of Shell Structures under Ice Boundary
In order to clarify the coupling mechanism between underwater vehicle and sea ice boundary in polar environment,based on Virtual.Lab software,finite element and boundary element methods are used to verify and calculate the modeling of infinite ice region,and then a multi-dimensional and multi-field coupling model of shell,seawater and sea ice is established by acoustic and vibration coupling method.The effects of different ice thickness and distance between shell and ice on structural vibration and sound radiation are analyzed.The results show that the ice boundary has less effect on vibration and more effect on sound radiation.The reflection of the ice boundary to the sound wave is larger than that of the free liquid in the low frequency band,and gradually smaller than that of the free liquid in the face of the sound wave as the frequency increases.With the increase of the ice thickness,the reflection effect of the ice on the sound wave is gradually enhanced,and the absorption of the sound wave by the ice is gradually reduced with the increase of the distance between the shell and the ice boundary.The research results can provide a reference for the study of acoustic and vibration characteristics of underwater vehicles in polar environment.
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