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:

2005 (Volume 15)
Number 1
1. A set of PID tuning rules
2. IMM based UKF and IMM based EKF algorithms for tracking highly maneuverable target
3. Parameterization of LMS-based control algorithms for local zones of quiet
4. On robust state feedback control of a permanent magnet synchronous machine drive: an experimental evaluation
5. A pole placement controller for active vehicle suspension
6. On the adaptive impulsive noise removal in color images

A set of PID tuning rulesDownload full PDF article
Leszek Trybus
(Department of Electrical Engineering and Informatics, Rzeszów University of Technology, Poland)

A set of PID tuning rules for four plant models used currently in self-tuning controllers is developed. The four models are: 1st and 2nd order plants with delays, multiple time constant, Strejc model. Critically damped responses are assumed, i.e. no overshoot and short settling time. Oscillatory responses can also be obtained for low-order models. Classical techniques of polezero cancellation, Pad? approximation and root locus are employed. The rules are "handbooklike", what means that they explicitly express PID settings in terms of plant parameters, making self-tuning applications possible. Settling time estimates are also given.

keywords: PID controller, tuning rules, root locus.


IMM based UKF and IMM based EKF algorithms for tracking highly maneuverable targetDownload full PDF article
Mohand Said Djouadi and Abdennour Sebbagh
(Laboratoire Robotique and Productique, Ecole Militaire Polytechnique, Algérie)
Daoud Berkani
(Electrical and Computer Engineering, Ecole Nationale Polytechnique, Algérie)

This paper aims to contribute in solving the problem of model-based body motion estimation by using data coming from visual sensors. We consider the case of state estimation in jump Markov nonlinear systems. The Interacting Multiple Model (IMM) algorithm is specially designed to track accurately targets whose state and/or measurement (assumed to be linear) models changes during motion transition. However, when these models are nonlinear, the IMM algorithm must be modified in order to guarantee an accurate track. In this paper we propose to compare the results given by an IMM algorithm Extended Kalman filter based (IMM-EKF) versus those given by an IMM algorithm Unscented Kalman filter based (IMM-UKF) in tracking target assumed to be highly maneuverable.

keywords: estimation, Kalman filtering, target tracking, visual servoing.


Parameterization of LMS-based control algorithms for local zones of quietDownload full PDF article
Ma³gorzata I. Michalczyk
(Institute of Automatic Control, Silesian University of Technology, Poland)

The paper summarizes the research on parameterization of LMS-based adaptive control algorithms for active noise control (ANC) systems. These single- and multi-channel systems were built in enclosures to create three-dimensional zones of quiet (3D ZoQs) by controlling electro-acoustic plants characterized by complicated dynamics and strong nonstationarities. On the basis of results of simulation as well as real-world experiments it was shown how the electroacoustic plant modeling errors, adaptation parameter and controller filter order choice influence the ANC system performance, also in nonstationary conditions. These observations were used to formulate some parameterization rules and hints for systems controlling electro-acoustic plants. It was shown that properly parameterized ANC systems create large adaptive, spatially moving 3D ZoQs.

keywords: Active Noise Control Systems, adaptation, FX-LMS algorithm.


On robust state feedback control of a permanent magnet synchronous machine drive: an experimental evaluationDownload full PDF article
K. Benmansour, M. Boucherit and M. Tadjine
(Laboratoire de Commande des Processus, Département de génie électrique, Ecole Nationale Polytechnique, Algérie)
H. Rezine
(Laboratoire de Controle et Commande, U.E.R d'automatique, Algérie)

This paper presents a theory and an experimental evaluation of robust control algorithm for permanent magnet synchronous machine (PMSM) speed drive fed by voltage source inverter. A simple control model is first obtained by performing field orientation through a nominal linearizing state feedback. Then, the robust control algorithm based on pole placement is applied to the PMSM in order to deal with plant uncertainties. The adopted method uses the notion of geometric stability and the multi-model approach in order to synthesis the state regulation by robust pole placement. To show the validity of our control approach, DSP based experimental results are presented. These results are very satisfactory and prove the feasibility of our control algorithm.

keywords: Permanent magnet synchronous machine, robust control, PWM inverter, field oriented vector control, state regulation, robust control, dSPACE kit, pole placement.


A pole placement controller for active vehicle suspensionDownload full PDF article
Jaros³aw Konieczny and Janusz Kowal
(Department of Process Control, AGH - University of Science and Technology, Poland)

The paper explores the potential applications of a controller designed in accordance with the pole placement rule. A 2DOF model representing a quarter-vehicle suspension is considered. However, this is only a theoretical model, and the dynamic properties of a active element are neglected. The study investigates how the variations of the gains matrix K elements should affect the dynamic behavior of an active vibration control system.

keywords: Pole placement, vehicle suspension, active variations control.


On the adaptive impulsive noise removal in color imagesDownload full PDF article
Bogdan Smolka and Konrad Wojciechowski
(Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, Poland)

In this paper a novel class of filters designed for the removal of impulsive noise in color images is presented. The proposed filter family is based on the kernel function which controls the noise suppression properties of the proposed filtering scheme. The comparison of the new filtering method with the standard techniques used for impulsive noise removal indicates its superior noise reduction capabilities and excellent structure preserving properties.

keywords: color image processing, noise reduction, image quality enhancement.


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