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Libration dynamics and stability of electrodynamic tethers in satellite deorbit

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Abstract

This paper studies libration dynamics and stability of deorbiting nano-satellites by short and bare electrodynamic tethers. A critical aspect of satellite deorbit by an electrodynamic tether is to maintain the tether aligned with the local vertical and stable while subjected to external perturbations. The dynamics of electrodynamic tether system in deorbit application is divided into the orbital motion of the center of system’s mass and the tether libration motion relative to that center. Major space environmental perturbations including the current-induced electrodynamic force, atmospheric drag, oblateness effect of the Earth, irregularity of geomagnetic field, variable plasma density, solar radiation pressure, and lunisolar gravitational attractions are considered in the dynamic analysis. Quantitative analyses are provided in order to characterize the order of the perturbative torques during the deorbit process. A single index is derived from the libration energy to stabilize the libration motion by regulating the current in the tether through simple on-off switching. Numerical results show that the libration dynamics of an electrodynamic tether has significant impacts on the deorbit process and the electrodynamic tether cannot effectively deorbit satellites without libration stability control. The proposed current regulation strategy is simple and very effective in stabilizing libration motion of an electrodynamic tether.

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Acknowledgments

This work is supported by the Discovery Grant of Natural Sciences and Engineering Research Council of Canada.

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  1. Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada

    R. Zhong & Z. H. Zhu

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  1. R. Zhong
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  2. Z. H. Zhu
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Correspondence to Z. H. Zhu.

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Zhong, R., Zhu, Z.H. Libration dynamics and stability of electrodynamic tethers in satellite deorbit. Celest Mech Dyn Astr 116, 279–298 (2013). https://doi.org/10.1007/s10569-013-9489-4

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