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Distributed Event-Based control for Interconnected Linear systems

Distributed Event-Based Control for Interconnected Linear Sy...

引用

IEEE Conference on Decision and control

作者： M. Guinaldo D. V. Dimarogonas K. H. Johansson J. Sanchez S. Dormido Department of Computer Science and Automatic Control Spanish University of Distance Education (UNED) Spain School of Electrical Engineering Royal Institute of Technology (KTH) Sweden

ISBN: (纸本)9781612848006

This paper presents a distributed event-based control strategy for a networked dynamical system consisting of N linear time-invariant interconnected subsystems. Each subsystem broadcasts its state over the network according to some triggering rules which depend on local information only. The system converges to an adjustable region around the equilibrium point under the proposed control design, and the existence of a lower bound for the broadcasting period is guaranteed. The effect of the coupling terms over the region of convergence and broadcasting period lower bound is analyzed, and a novel model-based approach is derived to reduce the communications. Simulation results show the effectiveness of the proposed approaches and illustrate the theoretical results.

关键词： design control equilibrium point Event-based broadcasting control strategy Linear system SUB-SYSTEM Lower bound Converge Distribute

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Ship's roll stabilization by anti-roll active tanks

Ship's roll stabilization by anti-roll active tanks

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OCEANS - Europe

作者： M. Haro R. Ferreiro F.J. Velasco Faculty of Nautical Sciences University of Cádiz Cadiz Spain Department Industrial Engineering University of A Coruña Spain Department Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

This paper examines the control of the heeling angle of a ship in still waters based on the utilisation of anti-heeling tanks operated by pressurized air. The proposed objective attempts to reduce the list angle to a null value during the loading process in a fast ferry ship. A nonlinear adaptive controller has been designed as a means of counteracting the parameter inaccuracies that are involved in the nonlinear model. These are the linear and quadratic damping coefficients and the size of the cargo that is being handled. The design is based on a relatively new methodology, the backstepping procedure. With the objective of reducing the number of sensors a model reference based nonlinear observer has been introduced. The controller thus designed provides a robust control system under parametric uncertainties and state variable errors. The designed control implies an improvement on the actual systems based on the PID control implemented under programmable logic controllers (PLCs).

关键词： Marine vehicles Damping Torque Backstepping Stability criteria Atmospheric modeling

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Mass action realizations of reaction kinetic system models on various time scales

Mass action realizations of reaction kinetic system models o...

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作者： Hangos, K.M. Szederkényi, G. Process Control Research Group Computer and Automation Reseach Institute Kende u. 13-17 Budapest H-1111 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 Veszprém Hungary

Complex chemical reaction networks often exhibit different dynamic behaviour on different time scales. A combined approach is proposed in this work for determining physically meaningful mass action realizations of complex chemical reaction networks that describe its dynamic behaviour on different time scales. This is achieved by appropriately reducing the detailed overall mass action kinetic scheme using quasi steady state assumptions fit to the particular time scale, and then searching for an optimal realization using mixed integer linear programing. Furthermore, the relationship between the properties (reversibility, deficiency, stability) of the obtained realizations of the same system on different time scales are also investigated and related to the same properties of the detailed overall model. It is shown that the reduced models obtained by quasi steady state assumptions may show exotic nonlinear behaviour, such as oscillations, when the original detailed is globally asymptotically stable. The proposed methods are illustrated by using a simple Michaelis-Menten type reaction kinetic example. The simplified versions of the well known Brusselator model have also been investigated and presented as a case study. © Published under licence by IOP Publishing Ltd.

关键词： Reaction kinetics

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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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Towards a Patient-Specific Model of Lung Volume Using Absolute Electrical Impedance Tomography (aEIT)

Towards a Patient-Specific Model of Lung Volume Using Absolu...

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4th International Joint Conference on Biomedical engineering systems and Technologies, BIOSTEC 2011

作者： Samuri, Suzani Mohamad Panoutsos, George Mahfouf, Mahdi Mills, G.H. Denaï, M. Brown, B.H. Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Department of Critical Care and Anaesthesia Northern General Hospital Sheffield United Kingdom School of Science and Eng. Teesside University Middlesbrough United Kingdom Department of Medical Physics Royal Hallamshire Hospital Sheffield United Kingdom

Electrical Impedance Tomography (EIT), and in particular its application to pulmonary measurement, has been the subject of intensive research since its development in the early 1980s by Barber and Brown. One of the relatively recent advances in EIT is the development of an absolute EIT system (aEIT) which can estimate absolute values of lung resistivity and associated lung volumes. In this paper we present a new approach based on Computational Intelligence (CI) modelling to model the 'Resistivity - Lung Volume' relationship that will allow more accurate lung volume estimations using data from eight (8) healthy volunteers measured simultaneously via the Sheffield aEIT system and a Spirometer. The developed models show an improved accuracy in the prediction of lung volumes, as compared with the original Sheffield aEIT system. However the inter-individual differences observed in the subject-specific modelling behaviour of the 'Resistivity-Lung Volume' curves suggest that a model extension is needed, whereby the modelling structure auto-calibrates to account for subject (or patient-specific) inter-parameter variability. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Electric impedance tomography

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Gradient-based classification and representation of features from volume data

Gradient-based classification and representation of features...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Marius Gavrilescu Vasile Manta Eduard Gröller Technical University of Iasi Romania Vienna University of Technology Austria Faculty of Automatic Engineering and Computer Control Technical University of Iasi Romania Computer Science Department University of Bergen Norway

The extraction and representation of information from volume data are important research avenues in computer-based visualization. The interpretation of three- or multi-dimensional data from various scanning devices is important to medical imaging, diagnosis and treatment, reliability and sustainability analyses in various industrial branches, and, in more general terms, information visualization. In this paper, we present several approaches for the classification and representation of relevant information from volume data sets. The techniques are based on the gradient vector, a property directly derived from the original volume data. We show how this property can be computed and subsequently used for classification through gradient-based one- and multi-dimensional transfer functions, as well as for the enhancement of surface features. The described techniques are illustrated through images generated using our volume rendering framework, from Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) data sets. The resulting images show how gradient-based techniques are suited for improved volume classification and the better extraction of meaningful information.

关键词： Transfer functions Image color analysis Rendering (computer graphics) Computed tomography Magnetic resonance imaging Skin Support vector machine classification

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Algorithms for the Traveling Salesman Problem with Neighborhoods Involving a Dubins Vehicle

Algorithms for the Traveling Salesman Problem with Neighborh...

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2011 American control Conference (ACC)

作者： Jason T. Isaacs Daniel J. Klein Joao P. Hespanha Center for Control Dynamical Systems and Computation and the Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

We study the problem of finding the minimum-length curvature constrained closed path through a set of regions in the plane. This problem is referred to as the Dubins Traveling Salesperson Problem with Neighborhoods (DTSPN). Two algorithms are presented that transform this infinite dimensional combinatorial optimization problem into a finite dimensional asymmetric TSP by sampling and applying the appropriate transformations, thus allowing the use of existing approximation algorithms. We show for the case of disjoint regions, the first algorithm needs only to sample each region once to produce a tour within a factor of the length of the optimal tour that is independent of the number of regions. We present a second algorithm that performs no worse than the best existing algorithm and can perform significantly better when the regions overlap.

关键词： Approximation algorithms Approximation methods Traveling salesman problems Path planning Aircraft Vehicle dynamics Euclidean distance

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Performance metrics for fault detection and isolation filters

Performance metrics for fault detection and isolation filter...

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作者： Pandita, Rohit Bokor, József Balas, Gary Department of Aerospace Engineering and Mechanics University of Minnesota Minneapolis MN 55455 United States Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 K-211 H-1111 Budapest Hungary

ISBN: (纸本)9781457700804

Fault detection and isolation (FDI) filters are typically synthesized for open-loop or closed-loop systems. The controller affects the FDI filter performance in the closed-loop. Performance metrics for FDI filters are proposed to assess filter performance and controller-filter interaction in the presence of uncertain dynamics in the closed-loop. The role of controller's robustness to plant uncertainty in FDI filter performance is examined. © 2011 AACC American automatic control Council.

关键词： controllers

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Optimal Charging of Plug-in Hybrid Electric Vehicles in Smart Grids

Optimal Charging of Plug-in Hybrid Electric Vehicles in Smar...

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IEEE Power and Energy Society General Meeting

作者： Somayeh Sojoudi Steven H. Low Department of Control and Dynamical Systems California Institute of Technology Computer Science and Electrical Engineering Departments California Institute of Technology

ISBN: (纸本)9781457710001

Plug-in hybrid electric vehicles (PHEVs) play an important role in making a greener future. Given a group of PHEVs distributed across a power network equipped with the smart grid technology (e.g. wireless communication devices), the objective of this paper is to study how to schedule the charging of the PHEV batteries. To this end, we assume that each battery must be fully charged by a pre-specified time, and that the charging rate can be time-varying at discrete-time instants. The scheduling problem for the PHEV charging can be augmented into the optimal power flow (OPF) problem to obtain a joint OPF-charging (dynamic) optimization. A solution to this highly nonconvex problem optimizes the network performance by minimizing the generation and charging costs while satisfying the network, physical and inelastic-load constraints. A global optimum to the joint OPF-charging optimization can be found efficiently in polynomial time by solving its convex dual problem whenever the duality gap is zero for the joint OPF-charging problem. It is shown in a recent work that the duality gap is expected to be zero for the classical OPF problem. We build on this result and prove that the duality gap is zero for the joint OPF-charging optimization if it is zero for the classical OPF problem. The results of this work are applied to the IEEE 14 bus system.

关键词： Smart grids optimal charging charging Polynomial time Power grids CHARGING(ACCOUNTTNG) Zero Joints Joints charging rate Batteries Hybrid electric vehicles

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An Approach to Data-Driven Design of Feedback control systems with Embedded Residual Generation

An Approach to Data-Driven Design of Feedback Control System...

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IEEE Conference on Decision and control

作者： Steven X. Ding Yulei Wang Ying Yang Institute for Automatic Control and Complex Systems (AKS) University of Duisburg-Essen Duisburg 47057 Germany Department of Mechanics and Aerospace Engineering College of Engineering Peking University Beijing 100871 China

ISBN: (纸本)9781612848006

Motivated by the increasing needs in the process industry for designing fault tolerant feedback control systems based on process data, data-driven design of feedback control systems with embedded residual generation is addressed. For this purpose, an extended internal model control (EIMC) structure aiming at accessing the residuals embedded in control loop is first proposed. Based on the identification of the so-called parity subspace and a well-established mapping between the parity vector and the solution of the Luenberger equations, a direct design scheme of EIMC from process data is developed. The achieved results are illustrated by an academic example.

关键词： Feedback control systems data driven design scheme Manufacturing industry embedding control ring

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