Browsing by Author "Gumussoy, S."
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Item Open Access On feedback stabilization of neutral time delay systems with infinitely many unstable poles(Elsevier B.V., 2018) Gumussoy, S.; Özbay, HitayIt is shown that strictly proper neutral time delay systems having at least one asymptotic pole chain converging to a vertical line Re(s) = σ > 0 cannot be stabilized by a proper controller. A special coprime factorization can be obtained for such systems with infinitely many unstable poles, provided they are bi-proper (i.e. proper, but not strictly proper). From this factorization, stabilizing feedback controllers are obtained. Necessarily, all stabilizing controllers for this type of plants are also bi-proper.Item Open Access Sensitivity minimization by strongly stabilizing controllers for a class of unstable time-delay systems(Institute of Electrical and Electronics Engineers, 2009) Gumussoy, S.; Özbay, HitayWeighted sensitivity minimization is studied within the framework of strongly stabilizing (stable) Hinfin controller design for a class of infinite dimensional systems. This problem has been solved by Ganesh and Pearson, for finite dimensional plants using Nevanlinna-Pick interpolation. We extend their technique to a class of unstable time delay systems. Moreover, we illustrate suboptimal solutions, and their robust implementation.