Title :
Precision pointing of scientific instruments on space station: The LFGGREC perspective
Author :
Blackwell, C.C. ; Sirlin, S.W. ; Laskin, R.A.
Author_Institution :
Texas Univ., Arlington, TX, USA
Abstract :
An application of Lyapunov function-gradient-generated robustness-enhancing control (LFGGREC) is explored. The attention is directed to a reduced-complexity representation of the pointing problem presented by the system composed of the Space Infrared Telescope Facility gimbaled to a space station configuration. Uncertainties include disturbance forces applied in the crew compartment area and control moments applied to adjacent scientific payloads (modeled as disturbance moments). Also included are uncertainties in gimbal friction and in the structural component of the system, as reflected in the inertia matrix, the damping matrix, and the stiffness matrix and the effect of the ignored vibrational dynamics of the structure. The emphasis is on the adaptation of LFGGREC to this particular configuration and on the robustness analysis
Keywords :
aerospace control; space vehicles; LFGGREC perspective; Lyapunov function-gradient-generated robustness-enhancing control; Space Infrared Telescope Facility; control moments; crew compartment; damping matrix; disturbance forces; gimbal friction; inertia matrix; reduced-complexity representation; scientific instruments; scientific payloads; space station; stiffness matrix; vibrational dynamics; Damping; Force control; Friction; Instruments; Payloads; Robust control; Robustness; Space stations; Telescopes; Uncertainty;
Conference_Titel :
Aerospace and Electronics Conference, 1988. NAECON 1988., Proceedings of the IEEE 1988 National
Conference_Location :
Dayton, OH
DOI :
10.1109/NAECON.1988.195063
