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Effective plant with pseudo-inverse of the B matrix. In Ref. 180, Buffington developed a linear programming solution that is capable of dynamically solving for:

One of the main tasks when designing QFT robust controllers is the definition of the plant frequency response, taking into account the complete n-dimensional space of model plant uncertainty. Consider an uncertain plant P, where P ∈ P, and P is the set of possible plants due to uncertainty, such that,


TP(jωi) is the associated template for ω = ω i , that is to say, the set of complex numbers representing the frequency response of the uncertain plant at a fixed frequency ω i . In other words, it is the projection of the n-dimensional parameter space onto ℜ2, according to the plant transfer function P for a given frequency (see Fig. A.1).