摘要
对于弹性容器与不可压无黏液体之间的线性耦合问题,已有缩聚对称形式的液固耦合系统有限元方程.利用比拟算法获得液固耦合系统的系统矩阵,将问题转化为通用有限元程序可以解决的问题.以包含贮箱的火箭模型为例,求解火箭的模态特性,其中包括由液体晃动所引起的火箭振动模态.结果表明此类模态与重力加速度有关,频率随重力加速度的增大而增大.
For the linear coupling of the elastic tank and incompressible and inviscid liquid,there are reduced and symmetric finite element equations of coupling system. The system matrix could be obtained by the analogy method,and then the analysis of coupling system will turn to be a problem that could be solved by the general finite element software. For example,the modal characteristics of the rocket with tanks were studied. Coupling modes caused by liquid sloshing were founded,and the result shows the modes of this kind are relevant to the gravity acceleration. In addition,the greater the gravity,the higher the frequency.
出处
《动力学与控制学报》
2014年第3期239-242,共4页
Journal of Dynamics and Control
基金
国家自然科学基金资助项目(11202052)~~
关键词
液固耦合
贮箱
有限元方法
比拟
fluid-structure interaction
tank
finite element method
analogy
