Fluid Added-Mass Effect on Flexural Vibration of Hemispherical Shell Structure

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2020-03-30 DOI:10.20855/ijav.2020.25.11604

S. Sepehrirahnama, Felix Bob Wijaya, D. Oon, E. Ong, H. Lee, K. Lim

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引用次数: 2

Abstract

In this hydroelasticity study, the fluid added-mass effect on a hemispherical shell structure under flexural vibration is investigated. The vibration response of the hemisphere is solved by using a commercial finite element software (ABAQUS) coupled with an in-house boundary element code that models the fluid as potential flow. The fluidstructure interaction is solved as a fully-coupled system by modal superposition to reduce the number of degrees of freedom. The need for an iterative scheme to pass displacement/force information between the two solvers is avoided by direct coupling between the fluid and structure equations. The numerical results on the downward shift in natural frequencies due to added-mass effect compare well with vibration measurements conducted on a stainless-steel bowl with interior and exterior fluid. For water and soap-water solution used in the experiments, the fluid viscosity (varying over a wide range) did not have any significant effect on the wet natural frequencies. This is due to the small viscous boundary layer (milimetre scale) compared to the nominal size of the bowl in centimetres. For such cases, the fluid-added mass only depends on the density of the fluid and the use of potential flow in the numerical model is applicable.

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流体附加质量对半球壳结构弯曲振动的影响

本文研究了半球形壳体结构在弯曲振动作用下的流体加质量效应。利用商业有限元软件(ABAQUS)和内部边界单元代码(将流体模拟为势流)求解半球的振动响应。通过模态叠加将流固耦合作为一个全耦合系统来求解，减少了自由度。通过流体和结构方程之间的直接耦合，避免了在两个求解器之间传递位移/力信息的迭代方案。数值结果表明，由于附加质量效应导致的固有频率下移与内外流体混合的不锈钢碗的振动测量结果相吻合。对于实验中使用的水和肥皂水溶液，流体粘度(变化范围很大)对湿固有频率没有任何显著影响。这是由于与以厘米为单位的碗的标称尺寸相比，粘性边界层(毫米尺度)较小。对于这种情况，加入流体的质量只取决于流体的密度，在数值模型中使用势流是适用的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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