A CMG-adapted Torque Profile for Slewing and Vibration Suppression of Flezible Spacecraft
Conventional input shapers for slewing flexible structures are sensitive to modeling uncertainty. Therefore, modeling errors and un-modeling parts introduce significant residual vibrations after slewing. Moreover,the discontinuous impulsive or square waveforms of the input shapers in time domain are only suitable for on-off reaction jets but not for the linear continuous actuators such as RWA and CMC A new robust vibration suppression torque profiles based on Gaussian wavelet,which overcomes all difficulties mentioned above, is obtained for simultaneous rest-to-rest maneuver and vibration suppression of flexible space structures. The low-pass filtering characteristic in frequency domain of the new profile guarantee the robust vibration suppression for all resonance flexible-modes, and the smoothed bang-bang waveform in time domain are very suitable for use of linear actuators. The slewing angle and duration of rigid body and lowest flexible-mode frequency of the spacecraft are used to determine the waveforms of the Gaussian wavelet. A model reference closed-loop tracking controller is designed to guarantee the precision of slewing. Single-axis slewing of flexible spacecraft including two V-gambled dual CMGs is used to evaluate the proposed profile. The results show that the new torque profile achieved good slewing and excellent robust vibration suppression capability compared with conventional feedback profiles in the presence of external disturbance and inaccurate system parameters.
Slewing Toque Shaping Vibration Suppression CMG
Meng Zhanfeng Han Chao
Beijing University of Aeronautics and Astronautics,Beijing 100083,China
国际会议
The 11th International Space Conference of Pacific-basin Societies(第11届环太平洋国际航天会议)
北京
英文
263-270
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）