Lockheed's approach to studying Large Space Optical System (LSOS) vihration suppression is to assemhle an integrated optics/structures/controls simulation and test the performance of the primary control system, high authority control/low authority control (HAC/LAC) against a defined suppression requirement. This simulation featured all of the key elements of an integrated suppression system analysis including: (1) partially validated finite element model; (2) requisite optical performance algorithms, and (3) closed loop HAC/LAC model. The integrated system analysis demonstrates that HAC/LAC meets specified requirements of -40 dB and supports the choice of HAC/LAC as the primary control system. Further, data from this analysis was used to show that selected actuators are of minimal weight (0.5 lb), will require eight locations, and do not cause significant changes in either modal frequencies or shape. The analysis showed: (1) eight actuators give jitter attenuation of 143 and 253 in x, y directions; (2) largest force level required ~1.0 lb; (3) HAC used 25 of 44 modes, and (4) LAC was not required for stability.
L. W. Hodge,
J. A. Breakwell,
"Large Space Optical System Active Vibration Suppression", Proc. SPIE 0748, Structural Mechanics of Optical Systems II, (3 June 1987); doi: 10.1117/12.939823; https://doi.org/10.1117/12.939823