Long-Time Deorbiting Dynamics of an Electrodynamic Tether System in Polar Orbits
Tong Zhou, Ti Chen, Hao Wen, Dongping Jin, Caoqun Luo
Abstract: Polar orbits are becoming high-risk area for space debris due to unique environment and intensive space activities. This paper focuses on the nonlinear dynamics and control of the deorbiting maneuver of an electrodynamic tether system in polar orbits. A dynamic model for describing the attitude dynamics of the system is developed based on a dumbbell assumption. Accounting for the characteristics of polar orbits, equations of motion for the orbital dynamics in both prograde and retrograde modes are derived using a set of modified equinoctial elements. In addition, orbital perturbations are involved to improve the model accuracy. For achieving a stable and rapid deorbiting of the system, a synthesized controller composed of switching control and optimal control methods is proposed by adjusting the tether current. Finally, numerical studies are carried out to investigate the parametric influences on the deorbiting dynamics of the system on polar orbits. The nonlinear interactions among electron density, magnetic field strength, orbital inclination, and deorbiting efficiency are thoroughly examined. Moreover, the effects of mass ratios and various tether physical parameters such as length, diameter, and material on deorbiting performance and stability are discussed.
文章链接：https://link.springer.com/article/10.1007/s11071-025-11716-w
