Abstract The retrieval of a tethered satellite system is intrinsically unstable. This paper develops a new control strategy to retrieve the tethered satellite system stably and quickly using the fractional order control theory. The governing equation of the tethered satellite system and classic linear feedback tension control law were first reviewed and examined as a benchmark. Then, a new fractional order tension control law has been to avoid the tethered satellite winds around the main satellite near the end of retrieval by existing integer order tension control laws. The newly proposed control law has been discretized and implemented by the Laplace transform and Tustin operator. Unlike the existing integer order control laws, which are based on the feedback of current state and memoryless, the fractional order control law has the memory of previous states and thus controls the tether retrieval more smoothly while maintaining the retrieving speed. The effectiveness and advantage of the new fractional order tension control law is demonstrated numerically by comparing with its integer order counterpart. The results show that the new control law not only retrieves the subsatellite without winding around the main satellite, but also provides a better control performance with smaller in-plane libration angles.

    Highlights Study the stability of tethered satellite retrieval, which is intrinsically unstable. Propose a new fractional order tension control law for stable tether retrieval. Discretize and implement the control law by Laplace transform and Tustin operator. Retrieved the subsatellite stable and fast without winding around the mainsatellite. Achieved better control performance with smaller in-plane libration angles.


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    Titel :

    Fractional order tension control for stable and fast tethered satellite retrieval


    Beteiligte:
    Sun, Guanghui (Autor:in) / Zhu, Z.H. (Autor:in)

    Erschienen in:

    Acta Astronautica ; 104 , 1 ; 304-312


    Erscheinungsdatum :

    2014-08-15


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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