Simulation results show that the new architecture allows precise tracking of a sine sweep acceleration reference signal avoiding vibrations when sweeping through modes. A new closed-loop system architecture is proposed in this paper, based on a feedforward-feedback tracking control strategy involving an H controller. Robust high precision tracking control of such systems with varying modal parameters is rarely addressed in the literature. In the presence of varying modal parameters of a spacecraft such as the mode frequency and corresponding damping ratio, the performance of the controlled system degrades. Keywords: Robust control and Hinfty control, Control applications, Estimations and identificationĪbstract: The vibration testing system of a large structure spacecraft presents inaccurate precision tracking and high oscillations in the neighborhood of its vibrational modes, particularly at higher frequencies.
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