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Digital Controller (digital + controller)
Selected AbstractsOptimal hold functions for MDCS sampled-data problemsINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 12 2003Leonid Mirkin Abstract In this paper the H2 and H, sampled-data problems with mixed discrete/continuous specifications (MDCS) are considered. The hold function is not fixed a priory but rather is the design parameter. The (sub)optimal controller obtained is of the form of a serial interconnection of a (sub)optimal digital controller and a (sub)optimal hold function. It is demonstrated that the incorporation of the hold function into the sampled-data design with MDCS extends considerably the possibility to reach a required trade-off between discrete and continuous specifications in comparison with designs with a fixed hold function. Copyright © 2003 John Wiley & Sons, Ltd. [source] Internal stabilization of standard sampled-data systemsPROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2003B. P. Lampe Prof. Dr. The paper presents necessary and sufficient conditions under which for a standard sampled-data system there exists a digital controller, that ensures the internal stability of the system. For the case of stabilizability a general expression for the set of all stabilizing controllers is given. The stabilizability conditions are formulated as divisibility of certain polynomials, controllability and observability concepts are not used. [source] Sampled-data H, control for networked systems with random packet dropouts,ASIAN JOURNAL OF CONTROL, Issue 4 2010Xiaosheng Fang Abstract This paper is concerned with the H, control problem for networked control systems (NCSs) with random packet dropouts. The NCS is modeled as a sampled-data system which involves a continuous plant, a digital controller, an event-driven holder and network channels. In this model, two types of packet dropouts in the sensor-to-controller (S/C) side and controller-to-actuator (C/A) side are both considered, and are described by two mutually independent stochastic variables satisfying the Bernoulli binary distribution. By applying an input/output delay approach, the sampled-data NCS is transformed into a continuous time-delay system with stochastic parameters. An observer-based control scheme is designed such that the closed-loop NCS is stochastically exponentially mean-square stable and the prescribed H, disturbance attenuation level is also achieved. The controller design problem is transformed into a feasibility problem for a set of linear matrix inequalities (LMIs). A numerical example is given to illustrate the effectiveness of the proposed design method. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] Guaranteed Cost Sampled-Data Control for Refining ProcessASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 1-2 2001Yingquan Lu This paper presents a synthetic design procedure of guaranteed cost sampled-data control (GCSDC) for refining process. When a digital controller controls the refining process with appropriate sample and hold devices, the closed loop system is periodic time varying. Based on this sampled-data system, considering the uncertainties in the continuous-time plant, we define the guaranteed cost control and a controller that not only stabilizes the closed loop system but also guarantees an adequate level of the performance. Simulation results show that the control scheme is effective and practicable. [source] | ||||||||||