Formulas on preview and delayed H/sup /spl infin// control

A generalized class of H/sup /spl infin// control problems, which covers preview and delayed control strategies, is discussed based on the state-space approach. By introducing a stable eigenspace of Hamiltonian matrix, the solvability and the analytic solution (control law) is newly established without including restrictive conditions. Based on the results obtained here, the solutions to typical control problems are illustrated and some illustrative examples are provided.