Increasing slew performance of reaction wheel attitude control systems
Crews, Steven R.,II
Ross, Isaac M.
MetadataShow full item record
This thesis explores the physical and mathematical limitations of two common attitude control systems: one based on reaction wheels and another based on control moment gyroscopes (CMGs). The dynamics are derived from first principles and control algorithms for achieving maximum reaction wheel potential are discussed. The shaped eigenaxis input is utilized to establish baseline maneuver performance. A time-optimal shaped input is introduced and implemented in a feedback setting, subject to the limitations of the Moore-Penrose pseudo-inverse control allocation. Finally, a feed-forward plus feedback controller is introduced to implement the time-optimal torque inputs directly to the reaction wheels. This obviates the need for the pseudo-inverse control allocation, and therefore exploits the total capacities of both the reaction wheel momentum envelope and torque envelope. These reaction wheel control approaches are compared with CMG performance to establish spacecraft size and slew parameters that make the use of reaction wheels a reasonable choice
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Lewis, Jack W. (Massachusetts Institute of Technology, 1966-05);A pneumatic, pure fluid oontrol system, capable of maintaining the angular position of an inertia load in a gravitational space, using only one moving part, was designed and built. The control system consisted of a ...
Watkins, R.J.; Chen, J.; Agrawal, B.N.; Shin, Y.S. (2004);For several future imaging and communications spacecraft, a challenging area of technology development is the fine acquisition, tracking, and pointing (ATP) control of the spacecraft and its payload. For example, some ...
Smythe, Reid W. (Monterey, California: Naval Postgraduate School, 2013-12);This thesis develops a suite of automated techniques aimed at analyzing the characteristics of arrays of control moment gyroscopes (CMGs) and/or reaction wheels (RWs). Three specific areas, relevant to the design of new ...