Abstract
The standard state space solutions to the H/sub /spl infin// control problem for linear time invariant systems are generalized to nonlinear time-invariant systems. A class of nonlinear H/sub /spl infin// controllers are parametrized as nonlinear fractional transformation on contractive, stable free nonlinear parameters. As in the linear case, the H/sub /spl infin// control problem is solved by its reduction to a state feedback and output injection problems, together with a separation argument. the sufficient conditions for H/sub /spl infin//-control problem to be solved are also derived with this machinery. The solvability for nonlinear H/sub /spl infin// control problem requires positive definite solution to two parallel decoupled Hamilton-Jacobi inequalities and these two solutions satisfy and additional coupling condition. An illustrative example, which deals with a passive plant, is given. >
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