The unsolved problem of how to control the attitude and shape of future very large flexible satellite structures represents a challenging problem for modern control theory. One aspect of this problem is the question of how to choose the number and locations throughout the spacecraft of the control system actuators. Starting from basic physical considerations, this paper develops a concept of the degree of controllability of a control system, and then develops numerical methods to generate approximate values of the degree of controllability for any spacecraft. These results offer the control system designer a tool which allows him to rank the effectiveness of alternative actuator distributions, and hence to choose the actuator locations on a rational basis. The degree of controllability is shown to take a particularly simple form when the satellite dynamics equations are in modal form. Examples are provided to illustrate the use of the concept on a simple flexible spacecraft.


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    Title :

    A Definition of the Degree of Controllability—A Criterion for Actuator Placement


    Contributors:
    C N Viswanathan (author) / R W Longman (author) / P W Likins (author)

    Conference:

    2nd VPI SU/AIAA Symposium on Dynamics and Control of Large Flexible Spacecraft ; 1979 ; Blacksburg, VA, US



    Publication date :

    1979-06-21


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English






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