The decentralized control of large flexible space structures

The decentralized robust servomechanism problem with constant disturbances/set points is considered in this paper for large flexible space structures (LFSS). It is shown that for LFSS with point force actuators co-located with displacementrate sensors that the decentralized fixed modes [1] of the system are precisely equal to the centralized fixed modes [2] of the system. Simple necessary and sufficient conditions are then obtained for a solution to the robust decentralized servomechanism problem for the system. A solution to the decentralized control of a 200th order LESS model (Purdue model) is included to illustrate the results.