naa a22 4500 510774210 CHVBK 20180411083225.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s40295-015-0066-9 doi (NATIONALLICENCE)springer-10.1007/s40295-015-0066-9 Evaluation of Five Control Algorithms for Addressing CMG Induced Jitter on a Spacecraft Testbed [Elektronische Daten] [Edwin Ahn, Richard Longman, Jae Kim, Brij Agrawal] Spacecraft often experience jitter from reaction wheels, control moment gyros (CMGs), or from motion of other internal parts. One may isolate fine pointing equipment by passive techniques, but active vibration control employing knowledge of the periodic nature of jitter can improve performance. Previous work by the authors and co-workers tested active isolation using a 6 degree-of-freedom Stewart platform. A new class of applications is laser communication relay satellites, which replaces radio frequencies communication by laser communications. Laser beam jitter can be corrected by control of tip and tilt in fast steering mirrors. This paper develops experiments testing five candidate jitter cancellation algorithms on the Bifocal Relay Mirror Spacecraft, Three Axis Simulator 2 testbed at the Naval Postgraduate School. Jitter results from the CMGs. Multiple period repetitive control (MPRC) and matched basis function repetitive control (MBFRC) are tested. Both use disturbance period information from Hall effect sensors for the CMG three phase brushless DC motors. Filtered-X LMS, adaptive linear model predictive control, and the Clear Box algorithm with Adaptive Basis Method are also tested. The best disturbance rejection resulted from the last of these choices, with a 66 % overall amplitude reduction. Concerning MPRC it was discovered that repeating an addressed period can be used as a technique to decrease sensitivity to accurate knowledge of the disturbance period. American Astronautical Society, 2015 Jitter mitigation nationallicence Optical relay spacecraft nationallicence Repetitive control nationallicence Adaptive control nationallicence Ahn Edwin Mechanical Engineering Department, Columbia University, 10027, New York, NY, USA aut Longman Richard Department of Mechanical Engineeing and Department of Civil Engineering and Engineering Mechanics, Columbia University, 10027, New York, NY, USA aut Kim Jae Mechanical and Aerospace Engineering, Naval Postgraduate School, 93940, Monterey, CA, USA aut Agrawal Brij Mechanical and Aerospace Engineering, Naval Postgraduate School, 93940, Monterey, CA, USA aut The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/3-4(2013-12-01), 434-467 0021-9142 60:3-4<434 2013 60 40295 https://doi.org/10.1007/s40295-015-0066-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s40295-015-0066-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ahn Edwin Mechanical Engineering Department, Columbia University, 10027, New York, NY, USA aut NATIONALLICENCE 700 1- Longman Richard Department of Mechanical Engineeing and Department of Civil Engineering and Engineering Mechanics, Columbia University, 10027, New York, NY, USA aut NATIONALLICENCE 700 1- Kim Jae Mechanical and Aerospace Engineering, Naval Postgraduate School, 93940, Monterey, CA, USA aut NATIONALLICENCE 700 1- Agrawal Brij Mechanical and Aerospace Engineering, Naval Postgraduate School, 93940, Monterey, CA, USA aut NATIONALLICENCE 773 0- The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/3-4(2013-12-01), 434-467 0021-9142 60:3-4<434 2013 60 40295 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer