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.


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    Titel :

    YES2 optimal trajectories in presence of eccentricity and aerodynamic drag


    Beteiligte:
    Williams, Paul (Autor:in) / Hyslop, Andrew (Autor:in) / Stelzer, Marco (Autor:in) / Kruijff, Michiel (Autor:in)

    Erschienen in:

    Acta Astronautica ; 64 , 7-8 ; 745-769


    Erscheinungsdatum :

    2008-11-06


    Format / Umfang :

    25 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    YES2 Optimal Trajectories in Presence of Eccentricity and Aerodynamic Drag

    Williams, Paul / Hyslop, Andrew / Stelzer, Marco et al. | AIAA | 2006


    Optimum rocket trajectories with aerodynamic drag

    Bryson, Jr., A.E. / Ross, S.E. | Engineering Index Backfile | 1958