Abstract
A block-Schwarz state-space realization is utilized to derive a model order reduction method for linear multivariable systems. It is shown that the proposed method may be regarded as a frequency-domain continued-fraction technique based upon a block "alpha-beta" expansion of matrix fraction descriptions. A new algorithm is presented in order to obtain the block-Schwarz realization from matrix fraction descriptions. Once the block-Schwarz matrix satisfies certain stability conditions then stable reduced models are provided. The proposed method constitutes a block version of the popular Routh approximation.
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