INTEGRATED DIRECT OPTIMIZATION OF STRUCTURE/REGULATOR/OBSERVER 89-1313-CP FOR LARGE FLEXIBLE SPACECRAFT

An numerical direct approach to design an optimal controller composed of regulator and observer has been proposed for integrated structure/controller optimization of flexible spacecraft. The approach takes account of uncontrolled residual modes. Therefore, it does not only optimize based on an actual performance index degraded by the residual modes but also suppresses the spillover instability. The approach has been applied to a simply supported beam examples first, and the characteristics of the resulting system have been investigated. The examples have demonstrated that the resulting controller is stable even when LQG controller is unstable. Insensitivity of the resulting system to parameter variations is also demonstrated compared with LQG controller. Subsequently, the approach have been incorporated in a structure/controller simultaneous optimization scheme. The practicality and effectiveness of the present scheme has been demonstrated in a beam-like flexible spacecraft example.

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