Libration control of bare electrodynamic tether for three-dimensional deployment

Cheng-xin, Luo; Wen, Hao; Jin, Dongping

doi:10.1007/s42064-018-0020-0

Cited by 11 publications

(3 citation statements)

References 31 publications

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“…The spinning motion of E-sail was studied by Du et al, who concluded that tether flexible tether motion is an essential factor in the stability of spinning tether systems [21]. Electrodynamic forces provide a propellant-less source of energy for SEDT maneuvers and attract focus from scholars [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear deformation and attitude control for spinning electrodynamic tether systems during spin-up stage

Hongshi,

Hang,

Changqing

et al. 2024

Nonlinear Dyn

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This paper studies the non-linear control of a spinning electrodynamic tether system during its spin-up process. The main problem of the spin-up process is that the tether shape may become irregular due to distributed electrodynamic force, which can lead to risks such as entanglement of the deformed tether with end bodies (base spacecraft and sub-satellite). To deal with this problem, a nonlinear control strategy is proposed in this paper for reducing tether deformation and for stabilizing attitude motions of end bodies. Firstly, the tether system is modeled based on the assumption of a flexible tether, and the minimum current for spin-up is given as the basis for open-loop program design. Secondly, considering the underactuation problem of the tether system, a sliding mode controller with an adaptive law is proposed to track spinning motion and stabilize tether deformation by adjusting only electrical current. Thirdly, considering the limit of attitude control moment, a high-gain saturated controller is proposed to stabilize the attitude motions of end bodies. In the end, numerical results validate that under the regulation of the proposed control strategy, tether deformation is reduced to an insignificant level, and attitude motions of end bodies are stabilized around designated orientations.

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Section: Introductionmentioning

confidence: 99%

“…Coefficient sat  should be relatively larger to attenuate disturbance. ( ) i fx is the hard saturation function, , i M S = indicates two saturation functions in(22)…”

mentioning

confidence: 99%

Nonlinear deformation and attitude control for spinning electrodynamic tether systems during spin-up stage

Hongshi,

Hang,

Changqing

et al. 2024

Nonlinear Dyn

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“…The study of Zhong shows that the libration dynamics and stability of EDT system is a key issue and regulated electric current in the tether to stable the libration motions [21]. Luo and Chen have developed the libration motions of EDT system by regular the tether current and length during the tether deployment [22], [23]. Li used a high fidelity multiphysics model of the EDT system for libration and transverse motion control of the system [24].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Libration Control of Electrodynamic Tether for Reboost Applications

Tian

2021

IEEE Access

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Electrodynamic tethers can be employed as an immensely promising propulsion system for boosting the altitude of spacecraft, cite instance space stations, satellites, and the like, which ameliorates the expenditure of fuel and minimizes detrimental spacecraft impacts. This paper analyzes the libration dynamics and stability of reboost spacecraft with insulation electrodynamic tethers. A key aspect of spacecraft reboost with an electrodynamic tether is how to keep the tether aligned with the local vertical and stabilized in the context of external disturbances. It has been shown in the current research that the librational instability results in the tether slackness and swings in long-term motion without effective control. Moreover, electrodynamic force (Ampere force) is regarded as a distributed load acting on the tether causing tether deformations which may be detrimental if severe. Aiming at the problem, an optimal control method and PID are given to stabilize the libration motion by modulating the tether current. The dynamical model of the electrodynamic tether system is established using Lagrange equations of the second kind under considering tether deformation and control laws are proposed based on the model. The effectiveness of libration stability control is validated through numerical results in which a current regulation law with appropriate control parameters is used for the libration motion of electrodynamic tether system.

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Deployment of flexible space tether system with satellite attitude stabilization

2019

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Libration control of bare electrodynamic tether for three-dimensional deployment

Cited by 11 publications

References 31 publications

Nonlinear deformation and attitude control for spinning electrodynamic tether systems during spin-up stage

Nonlinear deformation and attitude control for spinning electrodynamic tether systems during spin-up stage

Dynamic Analysis and Libration Control of Electrodynamic Tether for Reboost Applications

Deployment of flexible space tether system with satellite attitude stabilization

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