YES2 optimal trajectories in presence of eccentricity and aerodynamic drag |
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| Authors: | Paul Williams Andrew Hyslop Marco Stelzer Michiel Kruijff |
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| Institution: | 1. Delft University of Technology, 1/4 Maylands Avenue, Balwyn North VIC 3104, Australia;2. Delta-Utec SRC, Middelstegracht 89g, 2312 TT Leiden, The Netherlands;1. School of Astronautics, York university, 92 Xidazhi Street, Harbin 150001, China;2. Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, Ontario, Canada, M3J 1P3;1. School of Automation, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, China;2. Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada;1. National Key Laboratory of Aerospace Flight Dynamics, Northwestern Polytechnical University, Xi''an 710072, China;2. Research Center for Intelligent Robotics, School of Astronautics, Northwestern Polytechnical University, Xi''an 710072, China |
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| Abstract: | YES2 (launching 2007) aims to demonstrate a tether-assisted re-entry concept, whereby payload will be returned to Earth using momentum provided from a swinging tether. Deployment takes place in two phases: (1) deployment of 3.5 km of tether to the local vertical and hold, and (2) deployment to 30 km for a swinging cut. Optimal trajectories are determined for both phases after comparing the effect of different cost functions on the deployment dynamics. Closed-loop control is provided by linearizing the dynamics around the optimal trajectories and solving a receding horizon control problem for a set of linear feedback gains. The controllers are tested in a flexible tether model with large disturbances to the hardware model and environmental variables. Closed-loop simulations show that the system can be controlled quite well using only feedback of length and length rate. |
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