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A stability condition is developed for multivariable nonlinear feedback systems. The method has two outstanding features. First, a modified sector condition is employed to express the multivariable stability criterion. This is complemented by the use of high-order approximations to accurately evaluate the gains of nonlinear operators. An example demonstrates the utility of the method in defining stable...
Process controllers are to be designed and implemented in an environment of uncertainty in which the model/plant mismatch plays a detrimental role. In this paper, a tuning procedure is presented to account for this mismatch. The new techniques make use of the concept of singular value sensitivities, providing the designer with useful guidelines and tuning directions along which both stability and...
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