Formation flying for magnetic sails around artificial equilibrium points |
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| Institution: | 1. School of Aviation Operations and services, Air Force Aviation university, Changchun, China;2. Basic Sciences Department, Air Force Aviation university, Changchun, China;3. School of Astronautics, Beihang University, BeiJing, China;4. School of Internet of Things Engineering, Jiangnan University, Wuxi, China;5. Basic Sciences Department, Air Force Aviation university, Changchun, China;6. School of Aviation Operations and services, Naval Aviation university, Qingdao, China |
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| Abstract: | This paper investigates the problem of magnetic sail-based spacecraft formation control around the artificial equilibrium points (AEPs), which can eliminate the requirement of the propellant. The thrusts are achieved by utilizing the interaction between the solar wind and the artificial magnetosphere generated by superconducting current coil onboard. The circular restricted three-body problem (CRTBP) of magnetic sail is discussed including the allowed regions and linear stability of AEPs, the locations of collinear AEPs and the possibility of existence of periodic orbits around the collinear AEPs. Next, the dynamical models of magnetic sail formation around the collinear AEPs are established. A novel fast fixed-time nonsingular terminal sliding mode controller (FFNTSM) based on fixed-time disturbance observer (FTDO) is developed to account for external disturbances. Several numerical simulations are conducted to substantiate that spacecraft formation can be precisely controlled by the proposed propellantless propulsion method in the presence of external disturbances. |
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| Keywords: | Magnetic sail Artificial equilibrium points Spacecraft formation flight Formation control |
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