Last issue
2016 (vol. 26) - Number 4

Andrzej Ruszewski:

Practical and asymptotic stability of fractional discrete-time scalar systems described by a new model

D. Krokavec, A. Filasova, P. Liscinsky:

On fault tolerant control structures incorporating fault estimation

Sundarapandian Vaidyanathan:

Hyperchaos, adaptive control and synchronization of a novel 4-D  hyperchaotic system with two quadratic nonlinearities

H. Górecki, M. Zaczyk:

Analytic solutions of transcendental equations with application to automatics

F. Mnif:

Predictor-based stabilization for chained form systems with input time delay

S. Daniar, R. Aazami, M. Shiroei:

Multivariable predictive control considering time delay for load-frequency control in multi-area power systems

T. Kaczorek:

Analysis and comparison of the stability of discrete-time and continuous-time linear systems

M. Rachik, M. Lhous:

An observer-based control of linear systems with uncertain parameters

L. Malinski:

Identification of stable elementary bilinear time-series model

V.V. Huynh:

New observer-based control design for mismatched uncertain systems with time-delay

ACS Abstract:

2007 (Volume 17)
Number 2
1. New necessary conditions for optimal control of linear stationary systems
2. Affine invariant 2D recognition in grain classification
3. Combination and genetic algorithms for the locations and tuning of robust power system stabilizers
4. Advanced predictive control of a distillation column with neural models
5. On-line model identification for active noise control using integrated bispectrum analysis
6. New approach to linguistic fuzzy modeling of induction motor fed by PWM voltage source inverter

New necessary conditions for optimal control of linear stationary systemsDownload full PDF article
Stanislaw Bialas
(Faculty of Applied Mathematics, AGH University of Science and Technology, Cracow, Poland)
Henryk Gorecki
(College of Computer Science, Lodz, Poland )

The linear-quadratic problem in the system with proportional controllers is considered. New necessary conditions for establishing optimal values of gains Ki are determined which are very simple and convenient for calculations. New properties of the Hurwitz matrix are also discovered. The proposed method is alternative to the well known algebraic Riccati equations.

keywords: linear stationary systems, optimal control, Hurwitz matrix


Affine invariant 2D recognition in grain classificationDownload full PDF article
Katerina Novakova
(Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Software Engineering in Economy, Prague, Czech Republic)
Jaromir Kukal
(Institute of Chemical Technology, Faculty of Chemical Engineering, Department of Computing and Control Engineering, Prague, Czech Republic)

Invariant recognition of 2D binary image often arises from image moments. They enable the construction of affine transform, which ensures the invariance to translation, scaling, first rotation and stretching of the image. It is a problem to ensure the invariance to the second rotation. The paper deals with two methods how to realize the affine invariant recognition system with the numerical stable elimination of the second rotation. Modified images are obtained via polar or Radon's transform. Mentioned two approaches enable affine invariant systems construction and they were used for analysis of particles in granular mixtures. The affine invariant system is applied to detail analysis of fertilizer grains.

keywords: 2D recognition, affine invariance, classification, grain analysis, vision


Combination and genetic algorithms for the locations and tuning of robust power system stabilizersDownload full PDF article
Karim Sebaa
(Department of Electrical Engineering, University Center of Yahia Fares, Medea, Algeria)
Mohamed Boudour
(Department of Electrical Engineering, University of Sciences and Technology Houari Boumediene, Algiers, Algeria)

Combinations and Genetic Algorithms for the Locations and tuning of Robust Power System Stabilizers (PSS's) is presented in this paper. The PSS parameters and locations are computed to assure maximum damping performance under different operating conditions. The efficacy of this technique in damping local and inter-area modes of oscillations in multimachine power systems is confirmed through nonlinear simulation results and eigenvalues analysis.

keywords: optimal location, PSS design, genetic algorithm, transient stability, dynamic performances


Advanced predictive control of a distillation column with neural modelsDownload full PDF article
Maciej Lawrynczuk
(Institute of Control and Computation Engineering, Faculty of Electronics and Information Technology, Warsaw University of Technology, Warszawa, Poland)

This paper describes application of linear and nonlinear Model Predictive Control (MPC) algorithms to a cyclohexane-heptane distillation column. Two nonlinear MPC techniques are compared in terms of control accuracy and computational complexity: MPC with Nonlinear Optimization (MPC-NO) and MPC with Nonlinear Prediction and Linearization (MPC-NPL). In nonlinear MPC a feedforward neural model is used rather than significantly complicated and causing numerical problems fundamental model of the process.

keywords: model predictive control, neural networks, optimization, linearization, quadratic programming


On-line model identification for active noise control using integrated bispectrum analysisDownload full PDF article
Teresa Glowka
(Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland)

In the paper a problem of the on-line model identification of secondary and feedback paths in the feedforward ANC system is considered. The system is closed-loop, with low signal-to-noise ratio and with the disturbance affecting the input and output of the identified paths. To overcome the mentioned difficulties a new approach to the identification based on the higher-order spectra is presented. The integrated bispectrum-based identification method is proposed and the results of its applying are provided and compared with the results derived from the classical methods. The estimates are computed on the basis of data acquired in the laboratory (real-world) experiment as well as in the computer simulations.

keywords: active noise control, closed-loop systems, higher-order statistics, non-gaussian processes, spectral analysis, system identification


New approach to linguistic fuzzy modeling of induction motor fed by PWM voltage source inverterDownload full PDF article
L. Barazane
(University of Science and Technology Houari, Boumediene (USTHB) Faculty of Electronic and Computing, Alger, Algerie)
M.M. Krishan
(Al-Balq'a Applied University, Engineering of Information and Measurement Systems, Jordan)
A. Khwaldeh
(Department of Computer Science Faculty of Engineering, Philadelphia University, Jordan)
P. Sicard
(Groupe de Recherche en Electronique Industrielle Universite du Quebec a Trois-Rivieres Trois-Rivieres (Quebec) Canada)

In this paper, a new approach of linguistic fuzzy modeling proposed by Ben-Ghalia et al. is applied to induction motor. Thus, a classical model is first given together with the most used asynchronous motor control strategy, which is the pole assignment. After more, in order to minimize the dependence of the system to parameter variations and external perturbations, and reduce the number of variable states, a new model of the original system is proposed. This model is too simple and is suitable to cognitive approach such as fuzzy modeling. Then, fuzzy modeling of an uncertain system using the approach of Ben-Ghalia et al. to reduce the effects of imperfections of the classical modeling are introduced. In addition, their applications in the fuzzy sliding mode control of the asynchronous motor are presented. Finally, Simulation results reveal some very interesting features and show that the proposed fuzzy model has great potential for use as an alternative to the approximation of the conventional model of induction motor taking into account the effect of system model uncertainties and gives a good performances in sliding mode control.

keywords: feedback linearization, nonlinear feedback control, sliding mode control, induction motor, fuzzy model based control, fuzzy sliding mode control


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