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Original Articles

Three-dimensional optimal deployment of a tethered subsatellite with an elastic tether

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Pages 915-923 | Received 29 Dec 2006, Accepted 08 Jul 2007, Published online: 06 Jun 2008
 

Abstract

This paper presents the nonlinear optimal control for the deployment process of an elastically tethered subsatellite model, which involves not only the usually addressed in-plane motion, but also the out-of-plane motion. All the nonlinearities in the system model and the mission-related state-control constraints are taken into consideration. Instead of the commonly used state-space model, a second-order differential inclusion formulation is exploited in this paper to achieve a significant reduction of the number of system variables. The optimal control is solved by discretizing the optimal control problem first and then solving the resulting large-scale optimization problem. The case studies in the paper demonstrate well the performance of the proposed strategy.

Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant 10372039 and 10672073 and in part by the Innovation Fund for Graduate Students of Nanjing University of Aeronautics and Astronautics, China.

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