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Robust H ∞ control for uncertain discrete-time state-delayed linear systems with markovian jumping parameters 1

IFAC Proceedings Volumes 2001年第23期34卷 89-94页

作者： Reinaldo M. Palhares Carlos E. de Souza Pedro L.D. Peres Graduate Program in Electrical EngineeringPontifical Catholic University ofMinas Gerais Av. D. José Gaspar 500 30535-610 Belo Horizonte MG Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCCAv. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil

This paper addresses the problem of robust H ∞ state-feedback control design for uncertain discrete-time linear systems with multiple time delays at the states and Markovian jumping parameters. The jumping parameters are assumed to be available and the uncertainties are supposed to belong to convex bounded domains (polytope type uncertainty). Delay-independent sufficient conditions assuring robust stochastic stability and a prescribed H ∞ disturbance attenuation for the closed-loop uncertain discrete-time linear system with multiple time delays and Markovian jumping parameters are established in terms of linear matrix inequalities, which have the advantage that can be implemented numerically veryefficiently.

关键词： Robust H ∞ control time delay systems Markovian jumping parameters linear matrix inequalities discrete-time systems

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A Linear Matrix Inequality Approach to The Peak-to-Peak Guaranteed Cost Filtering Design

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IFAC Proceedings Volumes 2000年第14期33卷 29-34页

作者： Reinaldo M. Palhares Pedro L.D. Peres Jaime A. Ramírez Pontifical Catholic University of Minas Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Horizonte MG Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas SP Brazil. Department of Electrical Engineering Federal University of Minas Gemis Av. Antônio Carlos 6627 31270-010 Belo Horizonte MG Brazil.

The problem of robust filtering design for uncertain linear systems with guaranteed peak-to-peak performance is addressed in this paper. The uncertain parameters are assumed to belong to convex bounded domains (i.e. polytope type uncertainty). The aim is to design a full-order stable linear filter that minimizes the worst-case peak value of the filtering error output signal with respect to all magnitude bounded noise inputs, in such way that the filtering error system remains robustly stable. The minimization provides an upper bound to the L ∞ induced gain ( ℓ ∞ for discrete-time systems) of the filtering error system. The conditions for the existence of such robust filter are provided in terms of linear matrix inequalities, allowing the use of standard convex optimization procedures to solve the problem. Both continuousand discrete-time systems are considered. The formulation presented is illustrated by examples.

关键词： Robust Estimation Filter Design Uncertain Linear Systems Peak-to-Peak Gain Linear Matrix Inequalities

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Robust H ∞ Filtering for Linear Continuous-Time Uncertain Systems With Multiple Delays: An LMI Approach

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IFAC Proceedings Volumes 2000年第14期33卷 249-254页

作者： Reinaldo M. Palhares Pedro L.D. Peres Carlos E. de Souza Pontifical Catholic University of Minas Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Horizonte MG Brazil. School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil Department of Systems and Control Laboratório Nacional de Computção Científica - LNCC Av. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil.

The problem of robust H ∞ filter design for uncertain continuous-time linear systems with multiple time-delayed states is addressed in this paper. The uncertainties are assumed to belong to convex bounded domains (polytope type uncertainty) and the time delays are supposed to be constant. Delay-independent as well as delay-dependent stability conditions assuring robust stability and a prescribed H ∞ disturbance attenuation for the filtering error system are established, in both cases, in terms of linear matrix inequalities, which can be efficiently solved by standard optimization procedures with global convergence assured. Two illustrative examples are analyzed.

关键词： Time-delay systems Delay-dependent stability Delay-independent stability Robust H ∞ filtering Linear matrix inequalities

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Recurrent neural gas in electric load forecasting

Recurrent neural gas in electric load forecasting

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International Joint Conference on Neural Networks (IJCNN)

作者： M.A. Teixeira G. Zaverucha V.N.A.L. da Silva G.F. Ribeiro Systems Engineering and Computer Science Program-Graduate Programs in Engineering Federal University of Rio de Janeiro Brazil Electric Power Research Center Brazil

We have proposed for the task of hourly electric load forecasting a hybrid neural system combining unsupervised and supervised learning. The system consists of a recurrent neural gas (RNG) network and many Elman neural networks (ENs). RNG is a modification we introduced in the neural gas (NG) network in order to enable it to do clustering using a sequence of input data. For verifying the RNG's performance, many architectures are compared in the learning of global and local models. In a global model only one supervised network is trained and in a local model the training examples are grouped by a clustering algorithm and each one of these groups is sent to different supervised networks. These architectures use different clustering algorithms (NG and RNG) or different supervised networks for prediction (ENs that are trained by backpropagation or backpropagation through time, and feedforward networks).

关键词： Load forecasting Clustering algorithms Neural networks Predictive models Power engineering and energy Backpropagation algorithms Supervised learning Systems engineering and theory computer science Recurrent neural networks

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Robust H/sub /spl infin// filtering design with pole constraints for discrete-time systems: an LMI approach

Robust H/sub /spl infin// filtering design with pole constra...

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American Control Conference (ACC)

作者： R.M. Palhares P.L.D. Peres Graduate Program in Electrical Engineering Ponificia Universidade Católica de Mines Gerais Belo Horizonte Minas Gerais Brazil DT-School of Electrical and Computer Engineering State University of Campinas-UNICAMP Sao Paulo Brazil

The problem of full order guaranteed cost H/sub /spl infin// filtering design for discrete-time systems with polytope type uncertainty is investigated. The main purpose is to obtain a stable linear filter such that the filtering error system remains quadratically stable within a prespecified H/sub /spl infin// attenuation level. Necessary and sufficient conditions for the existence of such robust filter are provided in terms of linear matrix inequalities (LMIs), which can be efficiently solved by means of high performance convex optimization procedures with global convergence assured. Moreover, as an improvement, the filter dynamics can be constrained to some specific regions inside the unit open disk.

关键词： Robustness Nonlinear filters Riccati equations Attenuation Filtering theory Electronic mail White noise Robust control Uncertainty Output feedback

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Robust filtering with guaranteed energy-to-peak performance — an LMI approach

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IFAC Proceedings Volumes 1999年第2期32卷 1814-1819页

作者： Reinaldo M. Palhares Pedro L.D. Peres Pontifícia Universidade Católica de Minus Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Hotizonte - MG - Brazil School of Electrical and Computer Engineering University of Campinas DT/FEEC/UNICAMP - CP 6101 13.081-970 Campinas - SP - Brazil

The problem of robust energy-to-peak filtering for linear systems with convex bounded uncertainties is investigated in this paper. The main purpose is to design a full order stable linear filter that minimizes the worst-case peak value of the filtering error output signal with respect to all bounded energy inputs, in such way that the filtering error system remains quadratically stable Necessary and sufficient conditions arc formulated in terms of Linear Matrix Inequalities - LMIs, for both continuous- and discrete-time cases.

关键词： Robust Estimation Filter Design Uncertain Linear Systems Convex programming Energy-to-Peak Gain Linear- Matrix Inequalities

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Robust H/sub /spl infin// filter design for uncertain discrete-time state-delayed systems: an LMI approach

Robust H/sub /spl infin// filter design for uncertain discre...

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IEEE Conference on Decision and Control

作者： R.M. Palhares C.E. De Souza P.L.D. Peres Graduate Program in Electr. Eng. Pontifical Catholic Univ. of Minas Gerais Belo Horizonte Brazil Laboratório Nacional de Computação Científica-LNCC Petropolis Rio de Janeiro Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Sao Paulo Brazil

The problem of robust H/sub /spl infin// filtering for discrete-time uncertain linear systems with multiple state delays is addressed. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. Sufficient conditions for the existence of a stable linear filter assuring stability and a prescribed H/sub /spl infin// performance for the filtering error system for all allowed uncertainties are established in terms of linear matrix inequalities. Efficient numerical algorithms can be used to solve the problem, as illustrated via an example.

关键词： Robustness Filters Filtering Noise level Attenuation Noise measurement Signal processing Stability Delay Symmetric matrices

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Modelling combat system manning and manpower reduction

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NAVAL ENGINEERS JOURNAL 1999年第3期111卷 153-171页

作者： Roos, CH Carl H. Roos:is a Senior Engineer with Logicon-Syscon. A graduate of the University of Pittsburgh with a BSEE degree he has over 35 years experience in functional operational combat system fire control interface and computer program design. As technology changed and the combat system was upgraded Mr. Roos maintained his level of technical expertise by taking graduate-level courses in computer science modelling & structured analysis networking & fiber optics. He has worked in various capacities on the LHD LHA DDG 993 DD 963 LPD 17 LCC LPD 13 CGN 38 CGN 9 CG 26 and the DDG Class Combat Systems. In recent years Mr. Roos has been responsible for managing directing and performing engineering design and analysis efforts associated with Battle Management Organization (BMO) functional analysis and operational analysis. These efforts were used in defining combat system operational requirements shipboard space requirements and integration requirements. His paper “Configuration Management of Digital Programs” was published at the 1972 IEEE Southeastern Conrence.

NAVSEA 03K41 is responsible for generating Combat System Rattle Management Organizations (BMO) and Functional Flow Diagrams (FFD). Several years ago, NAVSEA provided the resources to conduct a functional analysis that would support the development and validation of the BMOs and FFDs. The major obstacle in performing the analysis was obtaining a consensus on how the functional hierarchy was to be structured. The non-optimum organization of the hierarchy was selected;as a result, the functions were difficult to define, find, use, and validate. Recognizing the shortcomings of this effort, research was conducted to evaluate state-of-the-art structured modelling techniques, concepts, and methodologies. Two modelling concepts by James Martin were found to be applicable for the combat system functional analysis: Enterprise Modelling Concept and Functional Decomposition Modelling Concept. The Structure Modelling definitions of Whitten, Bently, and Barlow provided the guidelines for using the Martin concepts. During the ensuing BMO and FFD development efforts, a Ship's Combat System (SCS) Modelling concept evolved and a SCS Model was developed. This paper addresses how the modelling concepts and tools are used in the BMO and FFD development and validation process. Data from the SCS Model provides the basis for defining combat system requirements (e.g., software, data display, database, networking, etc.).

关键词： Naval vessels

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Applying fuzzy functions and sequential coordination to optimization of machinery arrangement and pipe routing

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NAVAL ENGINEERS JOURNAL 1998年第6期110卷 43-54页

作者： Wu, BC Young, GS Schmidt, W Choppella, K Dr. Bi-Chu Wu:received a PhD in Mechanical Engineering from the University of Maryland College Park in 1991. She has worked on projects involving naval architecture design optimization solid mechanics and database development. Presently a senwr engineer with Angle Incorporated Dr Wu's research interests are in design optimization and fuzzy logic applications. Dr. Gin-Shu Young: a senior engineer with Angle Incorporated holds a PhD in Mechanical Engineering from the University of Maryland College Park. As a guest researcher with National Institute of Standards and Technologies from 1990 to 1993 he worked on vision-based navigation for autonomous vehicles. His experience also includes applications of optimization fuzzy logic neural network and genetic algorithm methods to engineering system design Mr. William Schmidt:co-founded Angle Incorporated in 1990 and has served as Vice PresidentlChiefScientist during this tame. He holds a B.Sc. in Applied Science from the Naval Acadt?my and an M.Sc. in Physics from the Naval Post Graduate School. He has cner 20 years experience in technical leadership material and personnel management. He has led the application of computer aided design (CAD) and Product Model Information Exchange to the shipbuilding industry. His experience also includes leading the amlication of model based operational analysis to support the Live Fire Test Program for DDG 51 Class Destroyers. Mr. Krishna M. Choppella:is a Sofware Engineer at Eidea Laboratories Incotporated where he works on componentbased distributed enterpvise frameworks. He has been involved in creating data analysis tools for the US Nay by integrating CAD modeis databases and graphical front ends. His work in the Masters degree program in Mechanical Engineering at the University of Texas at Austin was in di0ddase.r spectroscopy of combustion products in porous-matri burners. He received his Bachelors degree in Electrical Engineering in India. He was a Research Associate at the Centre for Laser Technology and Project Engi

Ship design is often multidisciplinary involving several design elements with various types of objectives and constraints (O/C) some easily described as mathematical formulas, others better modeled as descriptive assertions. This paper describes a method based on fuzzy functions and an integrated performance index to model O/C using descriptive assertions to be used with mathematical formulas in optimization. Another issue addressed in this paper concerns the coordination of design elements when sequentially coupled, that is, when one leads the other and the performance of the follower depends greatly on the design of the leader. Based on neuro-fuzzy techniques, the method described here coordinates and optimizes sequentially coupled elements. The two methods are applied to machinery arrangement (MA) and pipe routing (PR). Preliminary models for optimization of MA and PR are described considering convenience, producibility: engine room size, interference and location as factors in the O/C set. Some test results from MA/PR applications are presented and discussed. The methods are generic and can be extended to other elements in ship design. They are mutually independent and may be used separately Two advantages of their use are an improvement in overall performance and a reduction in the need for redesign of elements.

关键词： Optimization

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Performance analysis of hypothesis testing for pairwise interaction point processes

Performance analysis of hypothesis testing for pairwise inte...

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Asilomar Conference on Signals, Systems & computers

作者： J.A. Gubner Wei-Bin Chang M.M. Hayat Department of Electrical & Computer Engineering University of Wisconsin Madison WI USA Electro-optics Graduate Program University of Dayton Dayton OH USA

The sufficient statistic for the likelihood ratio test between pairwise interaction point processes is well-known. However, the evaluation of its performance is a challenging problem. In this paper it is shown that the distribution of the sufficient statistic can be approximated by the distribution of a Poisson-driven shot-noise random variable. This latter distribution can be readily computed using numerical methods.

关键词： Performance analysis Testing Statistical distributions Statistical analysis Random variables Distributed computing Error analysis Environmental factors Forestry Biological system modeling

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