中文摘要：

随着火箭运载能力、卫星工作寿命和深空探测器任务复杂度的不断提高，液体推进剂占航天器总质量的比重也不断增加，充液系统动力学成为理论界关注的课题．应用功能转换原理和能量守恒定律，通过耦合流体动力学功能型拟变分原理和刚体动力学功能型拟变分原理，建立充液系统刚-液耦合动力学功能型拟变分原理．文中研究了航天器充液贮箱液固耦合机理，对建立液体大幅晃动等效力学模型提供理论支持．

英文摘要：

With the increase of the capacity of launch vehicles, lifespan of satellites and the complexity of deep space missions increase, the mass proportions of liquid propellant in spacecrafts are enhanced accordingly. Liquid- filled system dynamics is a universally concerned topic in the theoretical field. The coupling between the quasi-vari- ational principle of fluid dynamics and the quasi-variational principle of rigid dynamics, along with the quasi-varia- tional principle of rigid-liquid coupling dynamics in liquid-filled system were researched by using the work and en- ergy transfer principle and energy conservation law. In this paper, the coupling mechanism of the liquid-filled tanks of spacecrafts is discussed, providing theoretical support for establishing the equivalent mechanical model of liquid large amplitude sloshing.