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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例也不断增加,充液系统动力学成为理论界关注的课题.本文在以往研究的基础上,应用功能转换原理和能量守恒定律,建立了充液系统刚-弹-液耦合动力学的功能型拟变分原理.通过推导拟驻值条件,建立了刚-弹-液耦合动力学的控制方程.本文对刚-弹-液耦合动力学的功能型拟变分原理在有限元素法中的应用进行了研究,为大规模液固耦合模型建模计算的应用研究提供了理论支持.
With the rocket carrying capacity, the working life of satellites and the complexity of the missions of deep space probes increasing, the proportion of liquid propellants to the total mass of spacecraft also continues to increase, and the dynamics of liquid charging system has become a topic of concern in the theoretical field.In this paper, On the basis of the study, the functional quasi-variational principle of the rigid-elastic-liquid coupling dynamics of the liquid-filled system was established by applying the principle of functional transformation and the law of conservation of energy. By deriving the quasi-variational principle, Dynamic governing equations.The application of the functional quasi-variational principle of rigid-elastic-liquid coupling dynamics to the finite element method is studied in this paper, which provides a theoretical basis for the applied research of large-scale liquid-solid coupling modeling stand by.