Validation of reduced-order models for control system design

The concept of suboptimality is applied to testing validity of reduced-order models in design of feedback schemes for large-scale systems. Aggregation and singular value decomposition as model reduction techniques, are interpreted in the expansion-contraction framework, which is suitable for evaluation of suboptimality of closed-loop systems resulting from reduced order designs. The proposed validation procedure is applied to a control design of a large space structure.