Nonlinear attitude control of flexible spacecraft under disturbance torque

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We present a control law for large-angle single-axis rotational maneuvers of a spacecraft-beamtip body (an antenna or a reflector) configuration. It is assumed that an unknown but bounded disturbance torque is acting on the spacecraft. A model reference adaptive torque control law is derived for the slewing of the space vehicle. This controller includes a dynamic system in the feedback path and requires only attitude angle and rate of the space vehicle for feedback. For damping out the elastic motion excited by the slewing maneuver, a stabilizer is designed assuming that a torquer and a force actuator are available at the tip body. The stabilizer uses only the flexible modes for the synthesis of the control law. Simulation results are presented to show that fast, large-angle rotational maneuvers can be performed using the adaptive controller and the stabilizer in spite of the presence of continuously acting unknown torque on the spacecraft. © 1986.




Singh, S. N. (1986). Nonlinear attitude control of flexible spacecraft under disturbance torque. Acta Astronautica, 13(8), 507–514.

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