Dynamics and Control of Mass-Variable Liquid-Filled Spacecraft With Combined Nonlinear Slosh
Liu Feng, Baozeng Yue, Bole Ma
Abstract
This paper focuses on the dynamics and control of liquid-filled spacecraft with nonlinear slosh in multi-tank, wherein the effect of liquid propellant consumption is considered. An improved parameter-variable 3DOF-rigid-pendulum slosh model is adopted to equivalently simulate the nonlinear slosh, including large-amplitude lateral sloshing and rotary sloshing, in partially-filled spherical tanks. First, the translation-rotation dynamics of a spacecraft with combined slosh in 2-tank is derived by using the Lagrangian formulation. Second, the dynamic responses of the spacecraft coupled with combined nonlinear slosh are simulated by giving large-angle attitude maneuvering cases and zero-impulse translation maneuvering cases. Third, a wave-based attitude controller of the liquid-filled spacecraft is designed. It is found that the combined propellant slosh can disturb the rigid-body motion (translation and rotation) of spacecraft with obvious jitter in certain directions, that the propellant consumption is likely to cause the non-convergence of the translation motion of spacecraft during zero-momentum maneuvering, and that the jitter disturbance of propellant slosh on the attitude motion of spacecraft can be absorbed by using the designed wave-based attitude controller.