Wet modal tests and numerical simulation for a rigid-liquid-flexible coupled structure

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 128-134.

CAI Kelun1,2, LIU Yuhong1,2, ZHU Yaqiang1,2, HUANG Cheng1,2, ZHANG Lianhong1,2

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Abstract

Based on physical model tests and finite element simulation, modal characteristics of a rigid-liquid-flexible coupled structure, a miniature model of “haiyan” underwater glider, was studied.Using hammering method, this structure’s wet modal frequencies and modal shapes characteristics under 3 different liquid-filled water pressures were measured.It was found that the structure has good vibration absorption action.Meanwhile, based on the acoustic-structure coupled algorithm of ANSYS Workbench software platform, the wet modal analysis of this structure was performed under different internal and external pressures to study variation of its wet modal frequencies and modal shapes.Analysis results showed that liquid additional mass effect can’t be ignored during modal analysis of this structure; increase in internal and external pressures can cause the structure’s wet modal frequencies to drop; the study results can provide a reference for wet modal analysis of relevant structures.

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solid-liquid-flexible coupling / wet mode / acoustic-structure coupling / modal simulation

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CAI Kelun1,2, LIU Yuhong1,2, ZHU Yaqiang1,2, HUANG Cheng1,2, ZHANG Lianhong1,2. Wet modal tests and numerical simulation for a rigid-liquid-flexible coupled structure[J]. Journal of Vibration and Shock, 2020, 39(23): 128-134

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