中文摘要：

针对航天器充液贮箱液固耦合机理和大规模液固耦合模型建模研究的不足，应用功能转换原理和能量守恒定律，建立刚-弹-液耦合动力学的功率型变分原理，推导刚-弹-液耦合动力学功率型变分原理的驻值条件，得到刚-弹-液耦合动力学的基本方程．通过正确处理无际边界条件，合理地解决了弹-液边界处的耦合问题．

英文摘要：

The research on the liquid-structure coupling mechanism of liquid-filled tanks of spacecrafts and large- scale application of modeling and calculation of liquid-structure coupling models are not so competent in China. The power-type variational principle of rigid-elastic-liquid coupling dynamics is established by the work and energy transfer principle and energy conservation law. Basic equations are obtained by deriving stationary value conditions of the power-type variational principle of rigid-elastic-liquid coupling dynamics. By handling the borderless bounda- ry condition correctly, the coupling problem can be solved correctly at the elastic-liquid boundary.