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Discusses the measurement of the level of interaction in MIMO quantitative feedback design (QFT) using Perron-Frobenius root. Design approach to reduce interaction in uncertain plants via a precompensator; Application of a decentralized stability results.

Presents an algorithm for calculating design bounds in multivariable quantitative feedback theory tracking design. Use of the algorithm to solve the problem of trade-off between on- and off-diagonal constraints; Design specifications; Recommendation on the evaluation of the algorithm at each pair of elements of the plant set.

Presents an algorithm to calculate the nonconvex hull with minimum concave radius defined by the feedback system specifications. Determination of nonconvex hulls of quantitative feedback theory templates; Reduction in the computational effort required for bound calculation at a given frequency and controller phase.

The article reports on implicit quasi-steady-state approximation and application to a power plant evaporator. The construction of reduced order models using quasi-steady-state or singular perturbation approach can hardly offer good low frequency approximations. An implicit quasi-steady-state technique is planned for general nonlinear models. The resulting reduced order model is exact to first order in the perturbation parameter and its linearization is correct to first order in frequency.