Abstract
A feedback control-system design problem involving input-output nonlinearities and structured plant parameter uncertainties is considered. Multivariable absolute stability theory is merged with the guaranteed cost control approach to robust stability and performance to obtain a theory of full- and reduced-order robust control design that accounts for input-output time-varying sector bounded nonlinearities. The principal result. is a sufficient condition for characterizing dynamic controllers of a fixed dimension which are guaranteed to provide robust stability for plant parametric variations and absolute stabilization for input nonlinearities.
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