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2011 2nd International Conference on control, Instrumentation and Automation, ICCIA 2011

作者： Maleki, Ali Geramipour, Arezou Semnan University Electrical and Computer Engineering Faculty Biomedical Engineering Department Iran Amirkabir University of Technology Biomedical Engineering Faculty Biological Systems Control Laboratory Iran

ISBN: (纸本)9781467316903

This paper presents a closed-loop control system for regulating blood glucose level in type-1 diabetic patients. The goals of designing controller are 1. avoidance of hypoglycemia (blood glucose concentrations should be above 3mmol/l) and 2. reduction in the blood glucose level (average blood glucose should be less than 7mmol/l) in diabetic patients. An intensive therapy for these patients is described by a continuous subcutaneous insulin infusion pump which mimics the natural insulin secretion in healthy person. The control algorithm uses experience of physicians to treat this disease by using Mamdani-type fuzzy logic controller (FLC). Robustness of this controller is tested by a group of diabetic patients models. Then to assess the performance and capabilities of fuzzy controller, the results of FLC were compared to PID controller for each diabetic patient. The results showed that FLC has a more stable response in presence of uncertainty in system parameters which can vary from patient to patient. © 2011 IEEE.

关键词： controllers

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Knowledge-based diagnosis of process systems using procedure HAZID information

Knowledge-based diagnosis of process systems using procedure...

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Lecture Notes in computer Science

作者： Werner-Stark, Ágnes Németh, Erzsébet Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary School of Chemical Engineering University of Queensland Brisbane QLD Australia Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary

ISBN: (纸本)9783642238536

Earlier investigations show that the results of hazard identification (HAZID) and analysis (e.g. HAZOP or FMEA) can effectively be used for knowledge-based diagnosis of complex process systems in their steady-state operation. In order to extend this approach for transient operating conditions controlled by operating procedures, the notion of nominal input-output event sequences of qualitative signals has been introduced, and the deviations used in the procedure HAZID analysis have been defined therefrom. The diagnosis can then be performed algorithmically by matching the deviation sequences of the observed input-output event sequences and the nominal ones generated by qualitative dynamic models. The concepts and methods are illustrated using a simple case study consisting of a simple tank, controlled by an operating procedure. © 2011 Springer-Verlag.

关键词： Hazards

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On the polyhedral set-invariance conditions for time-delay systems

On the polyhedral set-invariance conditions for time-delay s...

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作者： Lombardi, Warody Olaru, Sorin Lazar, Mircea Bitsoris, Georges Niculescu, Silviu-Iulian Automatic Control Department France LSS - Laboratory of Signals and Systems SUPELEC CNRS Gif-sur-Yvette France Department of Electrical and Computer Engineering University of Patras Patras Greece Department of Electrical Engineering Eindhoven University of Technology Eindhoven Netherlands

ISBN: (纸本)9783902661937

In this paper the concept of set invariance for time-delay systems is introduced with a specific attention to the linear discrete-time case. We are interested in the definition of a D(elay)-invariant set with respect to a bounded polyhedral subset of the state-space. D-invariance conditions are derived based on the Minkowski addition in a first stage, and subsequently translated in feasibility-based tests in order to obtain an efficient computation time. © 2011 IFAC.

关键词： Time delay

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A Dual Comparison Principle for the Analysis and Design of Discrete-Time Dynamical systems

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IFAC Proceedings Volumes 2011年第1期44卷 6437-6442页

作者： George Bitsoris Nikolaos Athanasopoulos Control Systems Laboratory Department of Electrical and Computer Engineering University of Patras 26500 Patras Greece

Abstract In this article, two new comparison principles for studying positive invariance and stability of linear and nonlinear discrete-time systems are presented. First, a general comparison principle enabling one to determine necessary and sufficient conditions of positive invariance of sets described by their “border surfaces” is developed. Then, a dual comparison principle describing the dynamics of the “vertices” of these sets is established. Both results can be used for the stability analysis and the control design of nonlinear systems.

关键词： comparison principle discrete-time systems positive invariance stability nonlinear systems

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Modified Banker's algorithm for scheduling in multi-AGV systems

Modified Banker's algorithm for scheduling in multi-AGV syst...

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IEEE International Conference on Automation Science and engineering (CASE)

作者： Luka Kalinovcic Tamara Petrovic Stjepan Bogdan Vedran Bobanac Laboratory for Robotics and Intelligent Control Systems Department of Control and Computer Engineering Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Laboratory for Renewable Energy Sources Department of Control and Computer Engineering Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

In today's highly complex multi-AGV systems key research objective is finding a scheduling and routing policy that avoids deadlock while assuring that vehicle utilization is as high as possible. It is well known that finding such an optimal policy is a NP-hard task in general case. Therefore, big part of the research is oriented towards finding various suboptimal policies that can be applied to real world plants. In this paper we propose modified Banker's algorithm for scheduling in multi-AGV systems. A predetermined mission's path is executed in a way that some non-safe states are allowed in order to achieve better utilization of vehicles. A graph-based method of polynomial complexity for verification of these states is given. Algorithm is tested on a layout of a real plant for packing and warehousing palettes. Results shown at the end of the paper demonstrate advantages of the proposed method compared with other methods based on Banker's algorithm.

关键词： Vehicles System recovery Layout Resource management Job shop scheduling Workstations

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Modeling, Simulation and control of a Spincopter

Modeling, Simulation and Control of a Spincopter

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2011 IEEE International Conference on robotics and Automation(2011年IEEE世界机器人与自动化大会 ICRA 2011)

作者： M. Orsag S. Bogdan T. Haus M. Bunic A. Krnjak Laboratory for Robotics and Intelligent Control Systems - LARICS Dept. of Control and Computer EngineeringFaculty of Electrical Engineering and ComputingUniversity of ZagrebZagrebCroatia

In this article we present a mathematical model of a spincopter -an inherently stable and easy to control unmanned aerial vehicle (UAV). Although the devised model represents only the first approximation of spincopter's physics, it captures basic phenomena that are sufficient for derivation and testing of a simple control algorithm. Results obtained by simulations in Simulink presented herein, demonstrate efficient performance of the proposed simple controller structure. Further tests, including investigation of complex aerodynamics effects and hardware-specified limitations, have been done using X-Plan software package. Finally, the proposed controller has been tested experimentally. Both, Xplane and experimental results confirmed the outcome from Simulink.

关键词： Aircraft Mathematical model Engines Propellers Force Atmospheric modeling

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Ultimate boundedness and robust stabilization of bilinear discrete-time systems

Ultimate boundedness and robust stabilization of bilinear di...

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IEEE Conference on Decision and control

作者： Nikolaos Athanasopoulos George Bitsoris Marina Vassilaki Control Systems Laboratory Electrical and Computer Engineering Department University of Patras Rion 26500 Greece Department of Electrical Engineering of ASPAITE Maroussi Athens-Greece

ISBN: (纸本)9781612848006

In this paper nonlinear time-varying and bilinear discrete-time systems with additive bounded disturbances are considered. First, conditions guaranteeing uniform ultimate boundedness for time-varying nonlinear systems are established. Then, algebraic conditions ensuring the existence of polyhedral Lyapunov functions, uniform boundedness and positive invariance for closed-loop bilinear systems are obtained. Finally, these results are applied to various robust stabilization problems for bilinear systems subject to persistent additive disturbances. It is shown that these problems can be reduced to a single or a series of linear programming problems.

关键词： bilinear systems uniform ultimate boundedness bilinearity linear programming time varying

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FPGA implementation of a pipelined 2D-DCT and simplified quantization for real-time applications

FPGA implementation of a pipelined 2D-DCT and simplified qua...

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2011 International Conference on Multimedia Computing and systems, ICMCS'11

作者： Anas, Hatim Belkouch, Said El Aakif, M. Chabini, Noureddine Embedded Systems and Digital Control Laboratory National School of Applied Sciences University of Cadi Ayyad Av. Abdelkarim Khattabi Guéliz Marrakech Morocco Department of Electrical and Computer Engineering Royal Military College of Canada Kingston ON Canada

ISBN: (纸本)9781612847306

The Discrete Cosine Transform (DCT) is one of the most widely used techniques for image compression. Several algorithms are proposed to implement the DCT-2D. The scaled SDCT algorithm is an optimization of the DCT-1D, which consists in gathering all the multiplications at the end. In this paper, in addition to the hardware implementation on an FPGA, an extended optimization has been performed by merging the multiplications in the quantization block without having an impact on the image quality. Tests using MATLAB environment have shown that our proposed approach produces images with quality comparable to the ones obtained using the JPEG standard. FPGA-based implementations of this proposed approach and the Loeffler's algorithm are proposed and compared in this paper using an Altera Startix FPGA family with the synthesis and implementation tool Quartus II. Results show that our approach outperforms the well known Loeffler's algorithm in terms of processing-speed and resources used. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Experiment design for Pauli channel estimation

Experiment design for Pauli channel estimation

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作者： Balló, Gábor Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 H-8200 Veszprém Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences P.O. Box 63 H-1518 Budapest Hungary

ISBN: (纸本)9783902661937

Experiment design for quantum channel parameter estimation includes the design of the quantum input to the channel and the observables to be applied on the resulting quantum output system, called the experiment configuration. An experiment design procedure based on maximizing the Fisher information of the qubit Pauli channel parameters is presented in this paper. It can be shown that the Fisher information is a convex function in both the input and the experiment configuration parameters. This leads to an optimal setting that includes pure input states and projective measurements directed towards the channel directions. An iterative method of estimating the channel directions is also proposed. © 2011 IFAC.

关键词： Iterative methods

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Adaptive output-feedback control of planar hybrid step motors using position-only feedback

Adaptive output-feedback control of planar hybrid step motor...

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International Conference on control and Automation (ICCA)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory (CRRL) Department of Electrical and Computer Engineering Polytechnic Institute of New york University Brooklyn NY USA

In this paper, the design of a nonlinear robust adaptive dynamic output-feedback controller for voltage-fed dual-axis linear stepper (Sawyer) motors is addressed using a detailed motor model with electrical dynamics and significant uncertainties and disturbances. The proposed controller utilizes only position measurements in each axis, and achieves practical stabilization of position tracking errors. Velocity and current measurements are not required for feedback. Furthermore, the only electromechanical motor parameter that is required to be known is the time constant of the electrical subsystem. Adaptations are utilized to remove requirement of knowledge of any other electromechanical system parameters. The controller is robust to load torques, friction, cogging forces, and other disturbances satisfying certain bounds. The controller also corrects for the yaw rotation to achieve synchrony of motor and rotor teeth.

关键词： Permanent magnet motors Reluctance motors Observers Force Windings Robustness Current measurement

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