30th IASTED Conference on Modelling, Identification, and Control, AsiaMIC 2010, Phuket, Thailand, 24 - 26 November 2010, pp.148-154
The robust servomechanism problem, which is to design a stabilizing controller such that the system output robustly tracks a given reference signal in the presence of certain disturbances, is considered for linear time-invariant time-delay systems of neutral type with discrete delays. The reference and the disturbance are assumed to satisfy a constant-coefficient linear delay-differential equation of neutral type with discrete delays. Necessary and sufficient conditions for the solvability of this problem are derived. The structure of the controller which solves this problem is also presented.