A hybrid control scheme for vibration of flexible spacecraft during manoeuvring operations is proposed in this paper. The new scheme integrates the method of optimal sliding mode control (OSMC) and the technique of active vibration suppression. In this control strategy, the technique of active vibration control using smart materials is first used actively to suppress certain flexible modes by designing optimal positive position feedback (OPPF) compensators that add damping to the flexible structures in certain critical modes in the inner feedback loop. For the outer loop, the OSMC theory is used to slew the spacecraft by minimizing the expected value of a quadratic objective function consisting of only desired errors with the constraints that desired error states always remain on the intersection of sliding surfaces. The advantage in this scheme is that the vibration reduction and attitude control are achieved separately in the two separate feedback loops, allowing the pointing requirements and simultaneous vibration suppression to be satisfied independent of one another. To study the effectiveness of the corresponding hybrid control scheme, initially a collocated proportional plus derivative (PD) control is developed to control the rigid body motion. The performances of the controllers are assessed in terms of the attitude pointing accuracy and vibration reduction as compared to the response with PD control and the PD-based hybrid control. Moreover, linear-quadratic Gaussian (LQG) control has also been developed to design the attenuator, and in view of vibration suppression the performance of LQG compensator is also compared with the response with the OPPF control. Both analytical and numerical results are presented to show the theoretical and practical merits of this approach.


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    Titel :

    Optimal sliding mode manoeuvring control and active vibration reduction of flexible spacecraft


    Beteiligte:
    Hu, Q. (Autor:in) / Ma, G. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    19 Seiten, 43 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch