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Basic Research in Spacecraft Actuator Control Allocation & Parameter Identification
Start Date: 5/15/2014Start Time: 11:00 AM
End Date: 5/15/2014End Time: 12:00 PM

Dr. Frederick Aaron Leve
Research Aerospace Engineer, Guidance, Navigation, & Controls Group, The Air Force Research Laboratory/Space Vehicles Directorate

Phillips Hall 736

Due to the unconstrained nature of space, spacecraft have the ability for unconstrained motion about all 6 degree of freedom. This motion for many spacecraft missions must be predictable, precise, and in some instances agile. Since spacecraft missions typically last for very long periods of time (i.e., typically on the order of 10-15 years) due to their high cost and long schedules design and fabrication, the actuators hosted on-board spacecraft must maintain performance reliably over the same time scale. Therefore, modeling, parameter identification, and control of spacecraft actuators becomes an imperative area of research for the Department of Defense and commercial satellite provides. The focus of this seminar is on current research on the modeling, identification, and control of spacecraft actuators used for their maneuvering. Topics to be discussed in this talk are the scalability of performance with size of miniature momentum control actuators; a novel approach to system identification that utilizes the null-space of a redundant set of actuators for identification of their parameters while providing minimal attitude perturbation to the satellite; and a novel method of control allocation for redundant sets of flywheel and gimbaled actuators that exploits the dissipative nature of friction in its control allocation solution to provide a more physically minimal power solution than the historically used Moore-Penrose pseudo-inverse solution. In addition, the local optimality of all pseudo-inverse solutions for CMG control allocation, including the Moore-Penrose solution is shown from the expanded use of a previously published cost function.

Dr. Frederick Aaron Leve for the last 5 years has been a Research Aerospace Engineer in the Guidance, Navigation, and Controls group of the Air Force Research Laboratory/Space Vehicles Directorate, who currently leads the research in spacecraft attitude dynamics and control. He has received his bachelor's, master's, and PhD degrees in aerospace engineering from the University of Florida. His research interests include, spacecraft and orbit attitude dynamics and control, spacecraft actuators, control moment gyroscope steering algorithms, system identification, and applied math.
Cindy Fields Arnold
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