CHAINED AGGREGATION MODEL WITH MINIMUM TRUNCATION ERROR.

A reduced-order model for a multi-input single-output or a single-input multioutput continuous system is proposed. The model is suitable for the case where accuracy in the high-frequency region is important. It also satisfies basic conditions for reduced-order models, such as uniqueness, stability, and a simple calculation requirement. Chained aggregation with the minimization of truncation errors introduces an internal system representation characterized by a system matrix of Hessenberg form and a diagonalized covariance matrix.