Abstract: Active control of large flexible structures (LFS) requires a reduced order model (ROM) of the actual structure, because the actual finite element model (FEM) of LFS is too large to be used as the basis for an active control algorithm. However, use of a ROM-based controller always results in some undesirable controller structure interaction (CSI). CSI does effect the stability margin and usually degrades the overall performance of the closed loop system even to the point of causing instability. In this paper, perturbation theory is used to identify those modes that are affected by CSI in order to be filtered out of the controller's path. The closed loop system without the CSI is perturbed by an operator that contains the CSI terms; thus resulting in a substantial reduction of the computational cost of identifying the affected modes. !5
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