Browsing by Subject "Control systems"
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Item Open Access Decentralized stabilization of interconnected systems: Structural conditions(1992) Yu, R.; Sezer, M. E.A unified framework is provided for the design of high-gain decentralized controllers for the stabilization of several classes of interconnected systems. These classes are characterized in terms of the structure of the interconnections among the subsystems, and include all those known in the literature to be decentrally stabilizable. The simple decentralized stabilizability tests, on which the results are based, can also be used to check the stabilizability of individual interconnected systems that do not belong to any one of the classes considered.Item Open Access A Hamiltonian-based solution to the mixed sensitivity optimization problem for stable pseudorational plants(Elsevier, 2005-11) Kashima, K.; Özbay, Hitay; Yamamoto, Y.This paper considers the mixed sensitivity optimization problem for a class of infinite-dimensional stable plants. This problem is reducible to a two- or one-block H∞ control problem with structured weighting functions. We first show that these weighting functions violate the genericity assumptions of existing Hamiltonian-based solutions such as the well-known Zhou-Khargonekar formula. Then, we derive a new closed form formula for the computation of the optimal performance level, when the underlying plant structure is specified by a pseudorational transfer function.Item Open Access H∞ filter design for vehicle tracking under delayed and noisy measurements(IEEE, 2007-06) Ezercan, Sami; Özbay, HitayIn many intelligent vehicles applications tracking plays an important role. This paper considers tracking of a vehicle under delayed and noisy measurements. For this purpose we design an H∞ optimal filter for linear systems with time delays in the state and output variables. By using the duality between filtering and control, the problem at hand is transformed to a robust controller design for systems with time delays. The skew Toeplitz method developed earlier for the robust control of infinite dimensional systems is used to solve the H∞ filtering problem. The results are illustrated with simulations and effects of the time delay on the tracking performance are demonstrated. ©2007 IEEE.Item Open Access Model based anticontrol of chaos(IEEE, 2003) Morgül, ÖmerWe will consider model based anticontrol of chaotic systems. We consider both continuous and discrete time cases. We first assume that the systems to be controlled are linear and time invariant. Under controllability assumption, we transform these systems into some canonical forms. We assume the existence of chaotic systems which has similar forms. Then by using appropriate inputs, we match the dynamics of the systems to be controlled and the model chaotic systems.Item Open Access Network model approach to the analysis of multirigid-body systems(Kluwer Academic Publishers, 1993) Tokad, Y.The mathematical model of a rigid body in three dimensional motion developed in [1] is used to formulate the equations of motion for the systems of rigid bodies connected to form a special type of open kinematic chain. In this interconnection pattern of rigid bodies, each rigid body is considered as a 3-port component, and for the sake of generality, initially no constraints are imposed on the joints used to interconnect the rigid bodies. The system is considered as an (m+1)-port component and the corresponding terminal equations are obtained in closed form. As an appliction of these equations, a three-link plane manipulator is considered. © 1993 Kluwer Academic Publishers.Item Open Access A Note on Robust Stability Bounds(IEEE, 1989) Sezer, M. E.; Siuak, D. D.The purpose of this note is to comment on stability robustness bounds for linear systems with multiple uncertain parameters, which were obtained via Lyapunov functions. Simple examples are used to illustrate the effects of the choice of functions and corresponding majorizations. © 1989 IEEEItem Open Access On diagonalization by dynamic output feedback(1989) Özgüler, A. B.; Eldem, V.The purpose of this paper is to draw attention to a casuality degree dominance property in diagonalization problems by dynamic output feedback and constant precompensator. Even in the well-investigated special case of square transfer matrices, the property of degree-dominance yields new insight into the structure of diagonalizable transfer matrices.Item Open Access An overview of design and operational issues of kanban systems(Taylor & Francis, 1999) Aktürk, M. S.; Erhun, F.We present a literature review and classification of techniques to determine both the design parameters and kanban sequences for just-in-time manufacturing systems. We summarize the model structures, decision variables, performance measures and assumptions in a tabular format. It is important to state that there is a significant relationship between the design parameters, such as the number of kanbans and kanban sizes, and the scheduling decisions in a multi-item, multi-stage, multi-horizon kanban system. An experimental design is developed to evaluate the impact of operational issues, such as sequencing rules and actual lead times on the design parameters.Item Open Access Set of open-loop block-diagonalizers of transfer matrices(Taylor & Francis, 1989) Özgüler, A. B.; Eldem, V.The set of open-loop (right) block-diagonalizers of a given p x m transfer matrix 2, with specified block sizes, is studied. A characterization of this set is obtained in terms of a 'maximal' open-loop block-diagonalizer and a minimal proper basis of the kernel of 2. The relevance of the results to some non-interacting control problems is pointed out. In particular, the results obtained yield a minimum delay solution to the block-decoupling problem using dynamic state feedback. © 1989 Taylor & Francis Group, LLC.Item Open Access A Solution to the diagonalization problem by constant precompensator and dynamic output feedback(IEEE, 1989) Eldem, V. A.; Ozguler, A. B.A solution is obtained for the problem of diagonalization (row by row decoupling) by a constant precompensator and a dynamic output feedback compensator of a p x m linear time-invariant system. The solvability condition is compact and concerns the dimension of a single subspace defined via the concepts of “essential rows” and “static kernels“ associated with the transfer matrix. A characterization of the set of all solutions to the problem is also given. In solving this dynamic feedback problem, we also obtain a complete solution to its state-feedback counterpart, namely, the restricted state-feedback problem of diagonalization. © 1989 IEEEItem Open Access Stability of delayed feedback controllers for discrete time systems(IEEE, 2003) Morgül, ÖmerWe consider the delayed feedback control (DFC) scheme for one dimensional discrete time systems. To analyze the stability, we construct a map whose fixed points correspond to the periodic orbits of the system to be controlled. Then the stability of the DFC is equivalent to the stability of the corresponding equilibrium point of the constructed map.Item Open Access Stabilization and disturbance rejection for the beam equation(IEEE, 2001) Morgül, ÖmerWe consider a system described by the Euler-Bernoulli beam equation in a bounded domain with appropriate boundary conditions. To stabilize the system, we propose a dynamic boundary controller applied at the free end of the system. We show that with the proposed controller, the closed-loop system is asymptotically stable. Moreover, we consider the case in which the output of the controller is corrupted by disturbance.