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ATTITUDE CONTROL OF FLEXIBLE LAUNCH VEHICLE USING ADAPTIVE NOTCH FILTER

Abstract Attitude control of a flexible launch vehicle is addressed in this study. A ground experimental model is developed for verification of different stabilization strategies. The experimental set up duplicates planar motion of flexible launch vehicles as a coupled hybrid dynamics of rigid body pitching motion and flexible vibration. In particular, adaptive notch filter, which updates filter parameters continuously from the sensor measurement, is implemented in real-time with experimental demonstration. The principal purpose of this study is, therefore, to verify the existing adaptive filter algorithm to investigate feasibility of actual implementation of the adaptation logic. Through experiment, it was shown that the adaptive filter stabilizes an uncertain system successfully in conjunction with thruster vector control actuation device using an air-thruster.