Singularly perturbed unified time systems with low sensitivity to model reduction using delta operators.

A method of designing a state feedback gain achieving a specified insensitivity of the closed-loop trajectory by the singularly perturbed unified system using the d operators is proposed. The order of system is reduced by the singular perturbation technique by ignoring the fast mode in it. The proposed method takes care of the actual trajectory variations over the range of the singular perturbation parameter. Necessary conditions for optimality are also derived. The previous study was done in the continuous time system. The present paper extends the previous study to the discrete system and the d -operating system that unifies the continuous and discrete systems. Advantages of the proposed method are shown in the numerical example. [ABSTRACT FROM AUTHOR]