不同边界条件下液箱流固耦合模态计算与实验验证

Experiment Verification and Modal Analysis of Fluid-structure Coupling Liquid Tank under Various Boundaries

对于船舶与海洋平台上设置的液舱,舱内液体介质和舷外水对舱体振动性能的影响不容忽视,以钢质液箱为研究对象,建立了流固耦合的有限元数学模型,运用有限元软件ADINA对液箱不同约束条件下的流固耦合现象进行数值计算。采用LMS结构模态分析系统进行实验研究,完成内、外均有流体载荷作用时液箱的振动模态分析。对比分析了不同边界条件和充液高度下的振动低阶固有频率和振型,所得结果和方法可供流固耦合方面研究参考。

The liquid tanks are installed in ships and offshore platforms. The impact of the liquid medium in liquid tanks and surrounding water on vibration performances of the hull should not be overlooked. The steel liquid tank as research object,a finite element mathematical model of Fluid-structure interaction（ FSI） was established.The FSI dynamics in liquid tanks under different constraints is numerically simulated and analyzed with the FEM software ADINA. The study is carried out experimentally by adopting LMS structural mode analysis system,completing the vibration mode analysis of the tank when fluid loads happen in the internal and external of the tank. Inherent frequencies and modals of low-frequency-vibration under different boundary conditions and various liquid-filled heights through comparision were analyzed. The findings and methods can serve as reference for future research on fluid structure interaction.