AbstractYES2 (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 3.5km of tether to the local vertical and hold, and (2) deployment to 30km 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.
YES2 optimal trajectories in presence of eccentricity and aerodynamic drag
Acta Astronautica ; 64 , 7-8 ; 745-769
2008-11-06
25 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
YES2 optimal trajectories in presence of eccentricity and aerodynamic drag
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Online Contents | 2009
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