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Two Time - Scale Hierarchical control of Integrated Quantity and Quality in Drinking Water Distribution systems

IFAC Proceedings Volumes 2013年第13期46卷 117-122页

作者： Mietek Brdys Xinyuan Huang Yu Lei Department of Automatic Control Gdansk University of Technology 80-233 Gdansk Poland Department of Electronic Electrical and Computer Engineering University of Birmingham Edgbaston Birmingham B15 2TT UK

The paper considers a feedback optimising control of drinking water distribution systems (DWDS). Although the optimised pump and valves scheduling and disinfectant injection control attracted considerable attention over last two decades most of the contributions were limited to an open-loop optimisation repetitively performed during the DWDS operation. Also, while a strong interaction between the water quantity and quality exists most of the proposals regards either quality or quantity control. The paper derives a two times-scale hierarchical controller with MPC control algorithms at the slow upper and fast lower control levels. The controller performance is validated by a comprehensive simulation study based on an example case study DWDS.

关键词： water supply systems hierarchical multilevel-multilayer control predictive control closed-loop control integrated plant control genetic algorithms water quantity and quality

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Cooperative Distributed Tracking MPC for Constrained Linear systems: Theory and Synthesis

Cooperative Distributed Tracking MPC for Constrained Linear ...

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IEEE Annual Conference on Decision and control

作者： Christian Conte Melanie N. Zeilinger Manfred Morari Colin N. Jones Automatic Control Laboratory Department of Information Technology and Electrical Engineering ETH Zurich 8092 Zurich Switzerland Department of Electrical Engineering and Computer Sciences University of California Berkeley CA 94702 USA Automatic Control Laboratory Ecole Polytechnique Federale de Lausanne (EPFL) 1015 Lausanne Switzerland

ISBN: (纸本)9781467357159

This paper provides a framework for distributed tracking of piecewise constant references for a network of constrained linear systems which act cooperatively. It is shown how the tracking problem can be posed as a distributed optimization problem and a method for distributed synthesis of the control law is presented. In particular, the notion of a distributed invariant set for tracking is introduced, by means of which a distributed constrained tracking controller with stability guarantee can be defined. A systematic procedure for the synthesis of ellipsoidal terminal sets for tracking is proposed, whereas all synthesis steps can be carried out by distributed optimization and hence without any central coordination. The proposed framework, as well as its functionality and performance, are illustrated by means of a numerical example.

关键词： distributed tracking synthesis Linear system control law systems Theory tracking problem Distribute tracking numerical example

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On Relative Observability of Discrete-Event systems

On Relative Observability of Discrete-Event Systems

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IEEE Annual Conference on Decision and control

作者： Kai Cai Renyuan Zhang W.M. Wonham Systems Control Group Department of Electrical and Computer Engineering University of Toronto Canada Xi'an Jiaotong University China

ISBN: (纸本)9781467357159

We identify a new observability concept, called relative observability, in supervisory control of discrete-event systems under partial observation. A fixed, ambient language is given, relative to which observability is tested. Relative observability is stronger than observability, but enjoys the important property that it is preserved under set union;hence there exists the supremal relatively observable sublanguage of a given language. Relative observability is weaker than normality, and thus yields, when combined with controllability, a generally larger controlled behavior;in particular, no constraint is imposed that only observable controllable events may be disabled. We present algorithms which compute the supremal relatively observable (and controllable) sublanguage of a given language, which is generally larger than the normal counterparts. We demonstrate the new observability concept and algorithms with a Guideway example.

关键词： Observability Algorithm design and analysis Generators Supervisory control Discrete-event systems controllability Uncertainty

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Integrated control in High-Speed Networks using constrained Model Predictive control

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IFAC Proceedings Volumes 2013年第13期46卷 284-289页

作者： S.M. Mwandosya M. Brdys Department of Electronic Electrical and Computer Engineering College of Engineering and Physical Sciences University of Birmingham Edgbaston Birmingham B15 2TT UK Department of Control Systems Engineering Faculty of Electrical and Control Engineering Gdańsk University of Technology Gdańsk Poland

This paper studies congestion control in high-speed communication networks using Model Predictive control (MPC). Network traffic is assumed to consist of best-effort and priority traffic sources. An integrated controller consisting of two control parts is designed. The controller calculates the capacity for priority sources and the input rate of best-effort sources. MPC is desirable as it can take into account the constraints on the finite buffer and input rate, as well as deal very well with systems with time delays.

关键词： Congestion control High-Speed networks MPC Constraints Prediction

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Finite-horizon estimation of randomly occurring faults for discrete time-varying systems

Finite-horizon estimation of randomly occurring faults for d...

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19th International Conference on Automation and Computing, ICAC 2013

作者： Dong, Hongli Wang, Zidong Shen, Bo College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Department of Information Systems and Computing Brunel University Uxbridge Middlesex UB8 3PH United Kingdom School of Information Science and Technology Donghua University Shanghai 200051 China Institute for Automatic Control and Complex Systems University of Duisburg-Essen Duisburg 47057 Germany

ISBN: (纸本)9781908549082

This paper deals with the finite-horizon estimation of randomly occurring faults for a class of linear discrete time-varying systems. All the system parameters are time-varying and the failures are assumed to occur in a random way, and two sets of Bernoulli distributed white sequences are introduced to govern the failures probability. By using the completing squares method and stochastic analysis techniques, necessary and sufficient conditions for the existence of the finite-horizon Hoo fault estimator are derived, and then the time-varying fault estimator parameters are obtained by solving coupled backward recursive Riccati difference equations (RDEs). A simulation example is utilized to illustrate the usefulness of the proposed fault estimation method. © 2013 Chinese Automation and Computing Society in the UK - CACS.

关键词： Riccati equations

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Certifying non-existence of undesired locally stable equilibria in formation shape control problems

Certifying non-existence of undesired locally stable equilib...

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IEEE International Symposium on Intelligent control (ISIC)

作者： Tyler H. Summers Changbin Yu Soura Dasgupta Brian D.O. Anderson Automatic Control Laboratory ETH Zurich Switzerland Australian National University NICTA Canberra Australia Department of Electrical and Computer Engineering University of Iowa USA

A fundamental control problem for autonomous vehicle formations is formation shape control, in which the agents must maintain a prescribed formation shape using only information measured or communicated from neighboring agents. While a large and growing literature has recently emerged on distance-based formation shape control, global stability properties remain a significant open problem. Even in four-agent formations, the basic question of whether or not there can exist locally stable incorrect equilibrium shapes remains open. This paper shows how this question can be answered for any size formation in principle using semidefinite programming techniques for semialgebraic problems, involving solutions sets of polynomial equations, inequations, and inequalities.

关键词： Polynomials Shape Programming Shape control Vectors Geometry

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H∞ state estimation for discrete-time systems with fading measurements and randomly varying nonlinearities

H∞ state estimation for discrete-time systems with fading m...

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19th International Conference on Automation and Computing, ICAC 2013

作者： Ding, Derui Wang, Zidong Dong, Hongli Shen, Bo School of Information Science and Technology Donghua University Shanghai 200051 China Department of Information Systems and Computing Brunel University Uxbridge Middlesex UB8 3PH United Kingdom College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Institute for Automatic Control and Complex Systems University of Duisburg-Essen Duisburg 47057 Germany

ISBN: (纸本)9781908549082

In this paper, the H∞ state estimation problem is investigated for a class of stochastic systems with the simultaneous presence of fading measurements and randomly varying nonlinearities (RVNs). A sequence of random variables obeying the Bernoulli distribution is utilized to govern RVNs. The Rice fading model, simultaneously, is employed to describe the phenomena of channel fadings by setting different values of the channel coefficients. The purpose of this paper is to design an H∞ state estimator such that the augmented system is stochastically stable and the disturbance rejection attenuation is constrained to a given level by means of the H ∞-performance index. In terms of stochastic analysis methods, sufficient conditions are established under which the addressed state estimation problem is recast as solving a convex optimization problem via the semi-definite programme method. Finally, a simulation example is employed to show the usefulness of the proposed design scheme. © 2013 Chinese Automation and Computing Society in the UK - CACS.

关键词： State estimation

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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Autonomie feedback with brain entrainment

Autonomie feedback with brain entrainment

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IEEE International Conference on Ubi-Media Computing

作者： Shu-Hui Tsai Yue-Der Lin Service Systems Technology Center Industrial Technology Research Institute Hsin-Chu Taiwan Department of automatic Control Engineering Feng-Chia University Taichung Taiwan

The study focused on the autonomous feedback with brain entrainment, specifically involving an user-friendly interface to control brainwave entrainment by variation in cardiac autonomie function. In combination with generation of brainwave entrainment, the device would be capable of delivering relief from pressure for user. The platform included several key technologies, such that the device could use measured cardiac rhythmic variation to control a multi-channel oscillators to bring the brain to a specific entrainment state. The excitatory state of autonomie activity, which was reflected by the cardiac rhythmic variation, including the overall potential level of autonomie activity, the potential from the sympathetic branch, and the parasympathetic activity, could be used as biofeedback of body status and an evidence of interaction for more personalized adaptation. This platform could be embedded in beds, chairs, or even the floors to provide a realistic interactive experience.

关键词： Resonant frequency Physiology Generators Biological control systems Vibrations Heart rate Oscillators

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Tightly-Coupled Integrated LR-WPAN/WiMAX Network: Architecture and Performance Modelling

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IERI Procedia 2013年 4卷 59-67页

作者： Ayyoub Akbari-Moghanjoughi Aduwati Sali José Roberto Amazonas Burhanuddin Mohd Ali Shamala Subramaniam Sabira Khatun Department. of Computer & Communications Systems Engineerin Faculty of Engineering Universiti Putra Malaysia Department of Telecommunications and Control Engineering of Escola Politécnica of the University of São Paulo Brazil Department of Communication Technology & Networks Faculty of Computer Science and IT Universiti Putra Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis Malaysia

In this paper a general architecture of tightly-coupled integrated LR-WPAN/WiMAX network has been introduced by proposing and utilising a novel access router named Wireless Integrated Access Router (WIAR). The suggested access router effectively combines both WiMAX and LR-WPAN technologies in a same device. The main motivation to propose this integration is to deploy Internet of Things (IoT) applications and services in wide area networks. Using WiMAX as backhaul service, the Internet connection can be provided for dispersed mobile LR-WPAN users over a wide area. Moreover, it enables to access all collected data in the local LR-WPAN coverage area – which is named as Senspot in this paper – by third-party clients through the Internet. Furthermore, an analytic model has been developed for the integrated network to evaluate the system's performance. Theoretical results on blocking probability of new and handover calls from WiMAX subscribers, as well as new connections from LR-WPAN Senspots in a cell of WiMAX have been investigated in terms of call/connection rates and number of allocated channels.

关键词： Backhaul Support Heterogeneous Wireless Network IoT Networks Integration WiMAX LR-WPAN.

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