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A DATA-BASED MEASURE FOR INTERACTIONS IN MULTIVARIATE SYSTEMS

IFAC Proceedings Volumes 2006年第2期39卷 681-686页

作者： M. Rossi A.K. Tangirala S.L. Shah C. Scali Computer Process Control Lab Dept. of Chemical Engineering University of Pisa Pisa Italy Dept. of Chemical Engineering IIT Madras Chennai India Department of Chemical & Materials Engineering - University of Alberta Edmonton Canada

This article focusses on the control loop performance diagnosis of a multivariate system with emphasis on the presence of interactions and poor performance of control loops. The paper provides a data-driven technique to determine if a decentralized PI(D) + controller will suffice or if an advanced controller ( e.g. , MPC) is necessary to handle the control interactions and improve the loop performance. Two different techniques are proposed: the first one, based on the Power Spectrum of the error, analyzes interactions in the frequency domain, while the second one, based on the evaluation of a modified IAE (Integral of Absolute Error), analyzes interactions in the time domain. A performance index for the controller is also proposed for the case of set-point tracking. Simulation and experimental case studies are presented to highlight the applicability of the proposed techniques.

关键词： Interactions MIMO systems frequency domain time domain

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Cooperative Diversity with Disconnection Constraints and Sleep Discipline for Power control in Wireless Sensor Networks

Cooperative Diversity with Disconnection Constraints and Sle...

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IEEE Conference on Vehicular Technology (VTC)

作者： C. Fischione A. Bonivento K.H. Johansson A. Sangiovanni-Vincentelli Automatic Control Lab School of Electrical Engineering KTH Stockholm Sweden EECS Dept. University of California Berkeley Berkeley CA USA

We derive a power control policy for a group of sensor nodes that are monitoring a real-time application sensitive to disconnections (outages) of the communication. Specifically, we suggest that the sensor nodes perform cooperative diversity while running a sleep discipline. After the description of a detailed model of the wireless links, we propose a power minimization algorithm with a constraint expressed in terms of outage probability. Suboptimal solutions are also discussed. Numerical examples are provided for various number of nodes, wireless scenarios and nodes activities. It is argued that nodes with reduced activity show better performance

关键词： Sleep Power control Intelligent networks Wireless sensor networks Protocols Energy consumption Land mobile radio cellular systems Signal to noise ratio Communication system control Frequency

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Modified Smith Predictor and controller for time-delay process with uncertainty

Modified Smith Predictor and controller for time-delay proce...

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6th World Congress on Intelligent control and Automation, WCICA 2006

作者： Wang, Shihua Xu, Bugong Wang, Qingyang Liu, Yun-Hui Lab. of Real-Time Control Through Internet and Fieldbuses College of Automation Science and Engineering South China Univ. of Technology Guangzhou 510640 China Dept. of Automation and Computer Aided Engineering Chinese University of Hong Kong Shatin NT Hong Kong

ISBN: (纸本)1424403324

Smith Predictor is very sensitive to uncertain system with variable time-delay. Using dual-locus diagram method, we first analyse the essence of Smith Predictor's sensitivity and present a proposition to illustrate the system stability criteria with relation to system gain and time-delay variation. Then a new modified Smith Predictor is proposed to compensate the variable time-delay system with uncertain model for set-point tracking. After that, we discuss the system internal stability and give two-degree freedom controller self-adaptive to eliminate the impact of system uncertainty with varying time-delay. Examples show the improved performance compared to previous Modified Smith Predictor structures. © 2006 IEEE.

关键词： Uncertain systems

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A Self-Tuning Loss-Model Based Efficiency controller for an Induction Motor Drive

A Self-Tuning Loss-Model Based Efficiency Controller for an ...

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International (EPE-PEMC) Power Electronics and Motion control Conference

作者： Gerardo Mino-Aguilar Juan Manuel Moreno-Eguilaz Bogdan Pryymak Juan Peracaula Dept. of Electronic Engineering Technical University of Catalonia (UPC) Barcelona Spain Dept. of Automatic Control Systems E.O. Paton Electric Welding Institute Kyiv Ukraine

In this paper, a vector-controlled induction motor drive with efficiency optimization using a loss model based approach is presented. To improve the robustness of the control system, a self-tuning controller has been designed. On-line estimators for rotor resistance and magnetizing inductance are included in the controller to improve performance. Analysis, modeling and simulation results are presented to demonstrate the validity of the proposed method.

关键词： Induction motor drives Predictive models AC motors Gain measurement Stochastic processes Position measurement Mechanical sensors Robustness Context modeling Accelerometers

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A Neural Network Based Optimal Rotor Flux Estimator for Efficiency Optimization of an Induction Motor Drive

A Neural Network Based Optimal Rotor Flux Estimator for Effi...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： G. Mino-Aguilar J.m. Moreno-Eguilaz B. Pryymak J. Peracaula Dept. of Electronic Engineering Technical University of Catalonia (UPC) Barcelona Spain Dept. of Automatic Control Systems E.O. Paton Electric Welding Institute Kyiv Ukraine

In this paper, a vector-controlled induction motor drive with efficiency optimization using a neural network based approach is presented. On-line estimators for rotor resistance and mutual inductance provide additional inputs for the neural network. Modeling and simulation results are presented to demonstrate the validity of the proposed method

关键词： Neural networks Rotors Induction motor drives Induction motors Stators Inductance Magnetic losses Magnetic flux Iron Copper

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FAULT DETECTION SYSTEM DESIGN FOR A CLASS OF STOCHASTICALLY UNCERTAIN SYSTEMS

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IFAC Proceedings Volumes 2006年第13期39卷 705-710页

作者： S.X. Ding P. Zhang E.L. Ding Institute for Automatic Control and Complex Systems University of Duisburg- Essen Bismarckstrasse 81 BB 47057 Duisburg Germany Dept. of Physical Engineering University of Applied Sciences Gelsenkirchen 45877 Gelsenkirchen Germany

This paper deals with problems related to designing fault detection systems for linear uncertain systems, where model uncertainties are characterised by stochastic changes in the model parameters. First, statistical features of the residual signals generated by means of an observer are studied. Based on the achieved results, a residual evaluation strategy is then developed, which combines the norm-based and statistic testing schemes. The major mathematical tool used in our study is the well-established LMI-technique.

关键词： Fault detection Uncertain systems stochastic systems observers

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Force control of a single-link flexible arm

Force control of a single-link flexible arm

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2006 IEEE International Conference on Mechatronics, ICM

作者： Payo, Ismael Feliu, Vicente Moallem, Mehrdad Dept. of Electrical Electronic and Control Engineering University of Castilla-La Mancha Campus Universitario s/n 13071 Ciudad Real Spain Department of Electrical and Computer Engineering University of Western Ontario London Ont. N6A 5B9 Canada

ISBN: (纸本)0780397134

A force control scheme is proposed in this paper for flexible manipulators based on a concentrated parameter mechanical model. This model is then used to develop a simple feedback control law for the coupling torque between the motor and the flexible arm. This control offers a good regulation of the contact force exerted by the flexible arm on the object, measuring only the coupling torque without the need to measure the contact force and the angle of the motor. The control law is described as a gain integral controller. Another outer control loop based on a Linear Quadratic Regulator (LQR) is added to improve the performance of the previous control. Also a collision detection algorithm is described for dealing with the force control problem. © 2006 IEEE.

关键词： Robotic arms

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Electrical stimuli capsule for control moving direction at the small intestine

Electrical stimuli capsule for control moving direction at t...

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4th IASTED International Conference on Biomedical engineering

作者： Woo, S.H. Jang, J.Y. Jung, E.S. Lee, J.H. Moon, Y.K. Kim, T.W. Won, C.H. Choi, H.C. Cho, J.H. School of Electronic Engineering and Computer Science Kyungpook National University College of Veterinary Medicine Dept. of Physiology Kynugpook National University Department of Computer Control and Electrical Engineering Kyungil University Advanced Research Center for Recovery of Human Sensibility Kyungpook National University Engineering Building 10 Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Republic of

ISBN: (纸本)0889865787

Recently, a capsule endoscope has been developed to observe images from the inside of intestine. Such a capsule endoscope does not have locomotion or hold method. To get proper diagnosis and medication, it is necessary to control the capsule from outside to guide locomotion. The designed and implemented capsule has feasibility to contract the small intestine by electrical stimuli through the electrodes. When the small intestine is contracted by electrical stimuli, the capsule can move to opposite direction, which means the capsule can go up and down in the small intestine. The implemented stimuli capsule always monitors excessive energy transmission and automatically shuts down the electrical stimuli to make it more secure. Additionally, the stimuli capsule goes on standby mode to save the battery, and it can be reset by comparator circuit which is connected to stimulus electrodes. To verify the design and implement the stimuli capsule, in-vitro experiments were performed with pig's small intestine.

关键词： Biomedical engineering

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Design and implementation of the telemetry capsule for measuring of electrogastrography

Design and implementation of the telemetry capsule for measu...

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4th IASTED International Conference on Biomedical engineering

作者： Jung, E.S. Lee, J.H. Woo, S.H. Yoon, K.W. Jang, J.H. Kim, M.K. Moon, Y.K. Kim, T.W. Won, C.H. Choi, H.C. Cho, J.H. School of Electronic Engineering and Computer Science Kyungpook National University College of Veterinary Medicine Dept. of Physiology Kynugpook National University Department of Computer Control and Electrical Engineering Kyungil University Advanced Research Center for Recovery of Human Sensibility Kyungpook National University Engineering Building 10 Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Republic of

ISBN: (纸本)0889865787

Electrogastrography (EGG) is a significant reference of the myoelectric activity of the gastrointestinal tract and indicates whether it has a disease or not. There have been numerous studies of the myoelectric activity in a stomach, but only a few studies of the intestines because of the difficulty of measurement in the intestines. Recently, the technology of the biotelemetry capsule for measurement of internal information in the human digestive tract has been developed. In the current study, an EGG telemetry system using the developed biotelemetry technology was designed and implemented for measuring EGG in intestines. The EGG capsule converts the acquired EGG value to digital data, which is transmitted from the capsule to the external receiver. The performance of the telemetry capsule for the EGG monitoring in the gastrointestinal tract was verified by in-vitro animal experiments. From the experiment, it was verified that the EGG telemetry capsule can measures a slow wave in intestines.

关键词： Biomedical engineering

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Modal fuzzy quantities and applications to control

Modal fuzzy quantities and applications to control

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： J. Bondia A. Sala M.A. Sainz Dept. of Systems Engineering & Control Technical University of Valencia Valencia Spain Email: jbondia@isa.upv.es Dept. of Systems Engineering & Control Technical University of Valencia Valencia Spain Dept. of Computer Science and Applied Mathematics University of Girona Girona Spain

In this paper modal fuzzy quantities and an arithmetic to operate with them are introduced. Based on the identification of a fuzzy quantity with the set of predicates it accepts and rejects, a modal fuzzy quantity is defined. Modal fuzzy intervals arise as a particular case, with either existential or universal modal intervals as alpha-cuts. Modal interval analysis can then be applied to the alpha-cuts, deriving a modal fuzzy arithmetic and new semantic theorems. These ones will allow to cast a suitable interpretation to existential and universal expressions involving fuzzy intervals, by requiring a non-fuzzy semantics to hold for each cut. A particular application of these ideas in the context of control theory is discussed.

关键词： Fuzzy control Arithmetic Fuzzy sets control systems Fuzzy systems Application software Bonding Systems engineering and theory computer science Mathematics

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