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Optimal control study for the Space Station solar dynamic power module

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6 Author(s)
Papadopoulos, P.M. ; ECE Dept., California Univ., Santa Barbara, CA, USA ; Laub, A.J. ; Kenney, C.S. ; Pandey, P.
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The authors present the design of an optimal control system for the Space Station Freedom solar dynamic fine pointing and tracking (SDFPT) module. A very large state model of six rigid modes and 272 flexible modes is used in conjunction with classical LQG optimal control to produce a full-order controller which satisfies the requirements. The results obtained are compared with those of a classically designed PID (proportional plus integral plus derivative) controller that was implemented for a six-rigid-body-mode forty-flexible-mode model. A major difficulty with designing LQG controllers for large models is solving the Ricati equation that arises from the optimal formulation. A Riccati solver based on a Pade approximation to the matrix sign function is used. A symmetric version of this algorithm is derived for the special class of Hamiltonian matrices, thereby yielding, for large problems, a nearly twofold speed increase over a previous algorithm

Published in:

Decision and Control, 1991., Proceedings of the 30th IEEE Conference on

Date of Conference:

11-13 Dec 1991

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