Generally, spacecraft with large flexible structures have multiple flexible modes with large effective masses and various mode shapes; therefore, the presence of uncertain high-order flexible modes should be considered in high-accuracy controller design. However, most researchers have proposed input preshaping algorithms that are valid only for a few flexible modes. Consequently, when these algorithms are applied to a flexible spacecraft having uncertain high-order flexible modes, residual vibrations might not be reduced sufficiently. This paper presents a smooth feedforward control algorithm for rest-to-rest maneuvers that significantly reduces residual vibrations at the endpoint of a maneuver. The new preshaping profiler is based on a filtering technique that combines a pair of sinc functions. The new profiler is compared to several conventional preshaping profilers. In addition, residual vibrations at the endpoint of maneuvers in the presence of unknown higher modes are found to be much smaller than those in other techniques. Only a hybrid-type profiler shows similar level of small residual vibrations comparable with the new profiler. The new profiler is suitable for rest-to-rest rotational maneuvers of a flexible spacecraft, especially when fine pointing accuracy is required at the endpoint of maneuvers; such accuracy is sometimes required for missions involving scientific observations. Presented as Paper 2009-6206 at the AIAA Guidance, Navigation, and Control Conference, Chicago, IL, 10-13 August 2009
Comparison of Preshaping Profilers for Reducing Residual Vibrations After Rest-to-Rest Maneuvers
2015
Aufsatz (Zeitschrift)
Englisch
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