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International Conference on Process Automation, control and computing (PACC)

作者： Akhil T. Nair T. K. Radhakrishnan K. Srinivasan S. Rominus Valsalam Department of Chemical Engineering National Institute of Technology Tiruchirappalli India Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirappalli India Centre for Development of Advanced Computing Thiruvananthapuram India

Tangentially-fired furnaces (TFF) are vortex-combustion units and are widely used in steam generators of thermal power plants. Perfect modeling and simulation of furnace gas temperature is quite difficult, due to its complex aerodynamics of burning particles, flame stability and hot gas flow distribution throughout the furnace. The temperature of the furnace gas depends on many parameters such as the inclination angle (tilt angle), fuel quality, burn out percentage and the flow rates in the burners for each of the furnace corners. However, the measurements are not available in the existing furnace operated at Neyveli Lignite Corporation (NLC), Neyveli. Thus, state estimation of temperature is an important prerequisite for safe and economical process operations. It is an integral part of applications such as process monitoring, fault detection and diagnosis, process optimization, and model-based control. Because all the process variables are generally not measured, an observer can be designed to generate an estimate of the state by making use of the relevant process inputs, outputs, and process knowledge, in the form of a mathematical model. The aim is to design a good state estimator for the furnace. Linear Kalman Filter (LKF) and Extended Kalman Filter (EKF) algorithms are developed for this problem and simulation results are compared.

关键词： Furnaces Mathematical model Kalman filters Computational modeling Boilers Fuels

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Physically Based Method for Cloth Deformation

Physically Based Method for Cloth Deformation

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Workshop on Digital Media and Digital Content Management (DMDCM)

作者： Shi Min Wang Zhaoqi Mao Tianlu School of Control and Computer Engineering North China Electric Power University Beijing China Institute of Computing Technology Chinese Academy and Sciences Beijing China

Physically-based method is the most popular approach for simulating textile. For obtaining realistic cloth animation, some related factors need to be considered, including animation model, material properties, integration technique etc. Internal and external forces are accumulated from which accelerations are computed based on dynamic equation. An integration method is then used to update velocities and positions of the object. In this paper, we proposed a novel method to simulate cloth animation. The in-plane forces are derived based on continuum model, and out-of-plane forces are added discretely. We use implicit integration method to solve motion equation. In addition, constraints are imposed to avoid penetration. Compared with other existing method, the proposed method can simulate the non-uniform wrinkled cloth with different material property, but also is stability.

关键词： Mathematical model Computational modeling Animation Equations Strain Force Stress

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Lyapunov Functions for Generalized Discrete-time Multivariable Popov Criterion

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IFAC Proceedings Volumes 2011年第1期44卷 3392-3397页

作者： N. Syazreen Ahmad W.P. Heath G. Li Control Systems Centre School of Electrical and Electronic Engineering University of Manchester Sackville Street Building Manchester M13 9PL UK (Tel: 0161 306 4659) School of Engineering Computing and Mathematics University of Exeter UK

Abstract This paper shows the existence of Lur'e-Postkinov Lyapunov functions for the generalized multivariable discrete-time Popov criterion. The nonlinearities in the Lur'e system considered here are monotonic, sector- and slope-restricted. We discuss the cases where the nonlinearities are diagonal and non-diagonal. Our derivation is based on the discrete-time Kalman-Yakubovich-Popov (KYP) lemma and the S-Procedure, and results in Linear Matrix Inequality (LMI) conditions which can be solved using convex optimization methods.

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Robust anti-windup compensator synthesis via Integral Quadratic Constraints

Robust anti-windup compensator synthesis via Integral Quadra...

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作者： Li, G. Heath, W.P. Herrmann, G. School of Engineering Computing and Mathematics University of Exeter North Park Road Exeter EX4 4QF United Kingdom Control Systems Centre School of Electrical and Electronic Engineering University of Manchester Manchester M13 9PL United Kingdom ACTLab. Department of Mechanical Engineering University of Bristol University Walk Bristol BS8 1TR United Kingdom

ISBN: (纸本)9783902661937

We develop an anti-windup (AW) compensator synthesis approach using Integral Quadratic Constraints (IQC). The synthesis finds the AW compensator that achieves a specified robustness against additive or input multiplicative uncertainty, provided there exists a feasible solution. We also incorporate a performance criterion into the AW compensator synthesis to achieve an appropriate trade-off between the performance and robustness. The efficacy of this approach is demonstrated by a numerical example. © 2011 IFAC.

关键词： Economic and social effects

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A Uniform Solution to Common Algorithmic Problem by Tissue P Systems with Cell Division

A Uniform Solution to Common Algorithmic Problem by Tissue P...

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International Conference on Bio-Inspired computing: Theories and Applications, BICTA

作者： Yunyun Niu Linqiang Pan Mario J. Perez-Jimenez Key Laboratory on Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei China Research Group on Natural Computing Department of Computer Science and Artificial Intelligence University of Sevilla Sevilla Spain

Common algorithmic problem is an optimization problem, which has the nice property that several other NP-complete problems can be reduced to it in linear time. A tissue P system with cell division is a computing model which has two basic characters: intercellular communication and the ability of cell division. The ability of cell division allows us to obtain an exponential amount of cells in linear time and to design cellular solutions to computationally hard problems in polynomial time. We here present an effective solution to the common algorithmic decision problem using a family of recognizer tissue P systems with cell division.

关键词： Manganese Polynomials Biomembranes Computer science Bismuth Radiation detectors Educational institutions

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Hα filtering for linear parameter-varying systems with jumping parameters subject to data missing and quantization

Hα filtering for linear parameter-varying systems with jump...

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作者： Yao, Xiuming Zheng, Weixing Li, Tao Hebei Engineering Research Center of Simulation and Optimized Control for Power Generation North China Electric Power University Baoding 071003 China School of Computing and Mathematics University of Western Sydney Penrith NSW 2751 Australia Department of Information and Communication Nanjing University of Information Science and Technology Nanjing 210044 Jiangsu China

ISBN: (纸本)9789881725592

This paper is concerned with the problem of Hα filtering for a class of discrete-time linear parameter-varying (LPV) systems with Markovian switching under data missing and quantization. A stochastic variable is used to describe the model of the data missing phenomenon. Then a H α filter is designed to guarantee the filtering error dynamics is stochastically stable with Hα performance. The existence of the desired Hα filter is ensured by some sufficient conditions expressed in terms of parameterized linear matrix inequalities (PLMIs). The proposed theoretical findings are validated by numerical results. © 2011 Chinese Assoc of Automati.

关键词： Stochastic systems

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Wavelet transform in biomedical image segmentation and classification

Wavelet transform in biomedical image segmentation and class...

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International Symposium on Image and Signal Processing and Analysis

作者： Aleš Procházka Oldřich Vyšata Magdaléna Kašparová Tat̂jana Dostálová Department of Computing and Control Engineering Institute of Chemical Technology in Prague Prague Czech Republic 2nd Medical Faculty Department of Paediatric Stomatology Charles University Prague Czech Republic

The contribution is devoted to the study of image segmentation and texture analysis to find image features invariant to image components rotation and translation. The main part of the paper presents the principle of Radon transform and its use in combination with the wavelet transform to find features minimizing their variance due to image components rotation. Proposed methods have been verified for simulated structures and then used for analysis of biomedical images including magnetic resonance images of the brain and orthodontic images. The goal of image processing included in all cases (i) segmentation of selected biomedical objects and (ii) detection of their features.

关键词： Image segmentation Feature extraction Discrete wavelet transforms Wavelet analysis Biomedical imaging

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Experimental study on the discrete trigonometric transform (DTT) wavelet-like decomposition stage with windowed filters

Experimental study on the discrete trigonometric transform (...

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Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA)

作者： Przemysław Korohoda Adam Dąbrowski Chair of Electronics AGH University of Science and Technology Krakow Poland Division of Signal Processing and Electronic Systems Chair of Control and System Engineering Faculty of Computing Poznan University of Technology Poznan Poland

In this paper an experiment designed and performed to verify the possibility of efficient windowing utilized in time domain with the Mallat type wavelet decomposition scheme is described. The main idea is that the used filters are designed not in the Fourier domain but in a domain of any of the 16 DTTs. It is demonstrated that the windowing technique, which reduces the number of the required computations up to 34 times, results in the error with statistically assessed PSNR of ca. 40 dB (from 36 to over 50 dB). The PSNR is obtained from MSE computed with an assumption that the processed signal is a realization of the first order Markov process with a given intersymbol correlation. If necessary, the reconstruction is assumed to be perfect.

关键词： Discrete cosine transforms Wavelet transforms Finite impulse response filter PSNR Wavelet analysis Wavelet domain

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Spiking Neural P Systems for Arithmetic Operations

Spiking Neural P Systems for Arithmetic Operations

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International Conference on Bio-Inspired computing: Theories and Applications, BICTA

作者： Xiangxiang Zeng Tao Song Linqiang Pan Xingyi Zhang Key Laboratory on Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei China Key Laboratory of Intelligent Computing and Signal Processing School of Computer Science and Technology Anhui University Hefei Anhui China

Recently, Gutierrez-Naranjo and Leporati considered performing basic arithmetic operations on a new class of bioinspired computing devices -- spiking neural P systems (for short, SN P systems). However, the binary encoding mechanism used in their research looks like the encoding approach in electronic circuits, instead of the style of spiking neurons (in usual SN P systems, information are encoded as the time interval between spikes). In this work, three SN P systems are constructed as adder, subtracter and multiplier, respectively. In these devices, a number is inputted to the system as the interval of time elapsed between two spikes received by input neuron, the result of a computation is the time between the moments when the output neuron spikes.

关键词： Neurons Tin Encoding Adders Educational institutions Generators Computational modeling

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Multimodel Software Sensor for a Harvested Fish Population System

Multimodel Software Sensor for a Harvested Fish Population S...

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2011 International Conference on Modelling,Identification and control(ICMIC 2011)

作者： Achraf Ait Kaddour EL Houssine El Mazoudi Noureddine Elalami Laboratory of Automatic Control and Industrial Computing Electrical Engineering Departement.Mohamamdi Engineering School Laboratoire de Recherche en Economie de l'Energie Environnement et RessourcesDépartement d'Economie Cadi Ayyad University

This paper deals with the problem of software sensor (state estimation) to study the continuous age structured model of a harvested fish population,in order to get an estimation of the biomass of fishes by age *** our case the fishing effort is considered as a control term,the age classes as a states and the quantity of captured fish as a measured *** continuous non-linear model is first represented by a Takagi-Sugeno ***,we develop a technique for designing a multimodel software sensor (called also observer) corresponding to this system and show its asymptotic *** design conditions are given in linear matrix inequalities (LMI) terms which can be solved efficiently using existing numerical *** simulation results demonstrate the effectiveness of the proposed method.

关键词： Multimodel Software Sensor for a Harvested Fish Population System Sensor

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