On-orbit identification and active vibration suppression for flexible spacecraft

Flexible spacecraft often has light damping and the natural frequencies are often low and closely spaced. To suppress the vibration effectively, a scheme that combined on-orbit identification and vibration suppression method is proposed. OKID identification algorithm is analyzed and then applied to a solar panel. The excitation method for identification is discussed. Moreover, OKID is compared with ERA to verify the applicability for on-orbit situations. Then the identification results are used to design the positive position feedback (PPF) controller. And the parameter tuning of the PPF compensator is discussed. Simulation results demonstrate the effectiveness of the proposed scheme.