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1

Kryterium do oceny współpracy zadanego układu regulacji z zadanymi węzłami sieci Internet

Kielan P., Kluszczyński K.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 12

26-28

PL

W artykule przedstawiono kryterium do oceny współpracy zadanego układu regulacji z zadanymi węzłami sieci Internet. Kryterium zostało sformułowane na podstawie zaproponowanej przez autorów metodologii badań procesów sterowania poprzez sieć Internet [3], jak też na podstawie uzyskanych wyników badań.

EN

The article presents the criterion for evaluation of the cooperation given control system at the given nodes in the Internet. The criterion has been formulated on the basis of proposed by the authors of the research methodology of control processes via the Internet [3], as well as on the basis of the obtained results.

2

The Dynamic Model of Closed-Loop Supply Chain with Product Recovering and its Robust Control

Qiu R., Huang X., Lu Z.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 9b

1-4

EN

In recent years, closed-loop supply chain (CLSC) operation has been an important method to recover waste materials and products for resource conservation and environmental protection and paid more attention in industry and academia. We establish a dynamic model for closedloop supply chain with product recovering with the consideration of some uncertainties including remanufacturing rate, disposal rate, operation costs and customers’ demand in this paper. Furthermore, we provide some insights about robust operation of closed-loop supply chain and propose a robust H∞ control strategy based on linear matrix inequality (LMI) arithmetic. Some simulations are executed to validate the effectiveness of our control strategy, and the results show that through state feedback control of supply chain inventories, it can not only make the CLSC achieve the goal of restraining uncertainty disturbances, but also result in an ideal operation cost.

PL

Closed loop supply chain (CLCP – zamknięta pętla łańcucha zasobów) jest dziś ważną metodą odzyskiwania zmarnowanego materiału i produktu w celu ochrony środowiska i konserwacji zasobów. Zaproponowano model dynamiczny uwzględniający niepewności typu tempo produkcji, tempo usuwania, koszty operacyjne i żądania klienta.

3

Optymalne sterowanie dynamiką wysokoobrotowego wirnika łożyskowanego magnetycznie

Mystkowski A., Gosiewski Z.

Pomiary Automatyka Robotyka

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2008

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R. 12, nr 2

599--608

PL

W referacie przedstawiono procedurę projektowania optymalnego układu sterowania odpornego drganiami wirnika łożyskowanego magnetycznie. Przebadano zachowanie się dynamiczne układu zamkniętego w szerokim zakresie prędkości obrotowych. Dobrano funkcje wagowe ograniczające sygnały wejścia/wyjścia oraz ograniczające obciążenia zewnętrzne np. od niewyważenia wirnika. Dokonano optymalizacji układu minimalizując normę H∞ nałożoną na układ zamknięty. Układ zamknięty z regulatorem H∞ jest odpornie stabilny mimo niewyważenia i strukturalnej niestabilności aktywnego zawieszenia magnetycznego wirnika. Badania symulacyjne i eksperymentalne wykazały, że układ sterowania posiada dobrą jakość sterowania w stanach przejściowych, kompensację drgań wirnika oraz odporność regulatora na zmiany obiektu sterowania.

EN

In the paper the robust control method was applied in the active magnetic bearings system (AMB). The dynamical behavior of closed-loop system in wide range of rotation speed was investigated. The input and output signals of the closed-loop system and the disturbances were limited by the weighting functions. The H∞ robust controller was designed and the H∞ closed-loop system was investigated. The H∞ closed-loop system is robust stable in spite of unbalance and structural instability of AMB. Finally simulation and experimental results show the effectiveness of the control system as well as good initial responses/transient responses, unbalance compensation and robustness of the designed controller.

4

State-feedback solutions via transfer function representations

Banyasz C., Keviczky L.

Systems Science

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2004

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Vol. 30, no 2

21-34

EN

The TFR equivalent forms of LTI systems are used to analyze some structural properties of the classical SF and SFO schemes. It is shown how the poles and zeros of the closed-loop system can be designed in a TDOF scheme. A two-step procedure is suggested to reach full zero/pole placement for SISO systems.

5

Design of linear feedback for bilinear control systems

Belozyorov V. Y.

International Journal of Applied Mathematics and Computer Science

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2002

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Vol. 12, no 4

493-511

EN

Sufficient conditions for the conditional stability of trivial solutions for quadratic systems of ordinary differential equations are obtained. These conditions are then used to design linear control laws on the output for a bilinear system of any order. In the case of a homogeneous system, a domain of the conditional stability is also indicated (it is a cone). Some examples are given.

6

Neural network based smart accelerometers for use in telecare medicine.

Gaura EI., Rider RJ., Steele N., Naguib RNG.

Systems Science

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2000

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Vol. 26, nr 3

83-96

EN

Sensors that perform the task of measuring the physical quantity of acceleration are discussed. Applications for such measurements and thus of accelerometers, range from early diagnosis procedures for tremor-related diseases (e.g. Parkinsons) to monitoring daily patterns of patient activity using telemetry systems. The system-level requirements in such applications are considered and two novel neural network transducer designs developed by the authors are presented which aim to satisfy such requirements. Both designs are based on a micromachined sensing element with capacitive signal pick-off. The first is an open-loop design utilising a direct inverse control strategy, whilst the second is a closed-loop design where electrostatic actuation is used as a form of feedback. Both transducers are nonlinearly compensated, capable of self-test and provide digital outputs.

7

A new robust composite adaptive approach to the control of rigid robots which guarantees finite error convergence time.

Barambones O., Etxebarria V.

Systems Science

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2000

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Vol. 26, nr 3

69-81

EN

In this paper a new robust adaptive control scheme for robotic manipulators is presented. The design consists of: 1) a composite adaptive controller, driven by both the tracking and the prediction errors, for learning the modelled dynamics; and 2) a nonlinear sliding mode control law that overcomes the unmodelled dynamics and noise. As a whole, the closed-loop system is proved to be stable and it is shown that the tracking error converges to zero in finite time.

8

An outline of the linear control system synthesis by a proper, stable rational functions approach

Ładziński R.

Archives of Control Sciences

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1998

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Vol. 7, no. 3/4

241-265

EN

In the process of designing controllers for linear multivariable plants specially effective are algebraic methods which require from the transfer matrices of both, the plant and the controller to be presented in coprime fractional form with factorization carried on with respect to the ring of exponentially-stable, proper real-rational functions. The main objective of the paper is to show that this form of representation with simultaneous parametrization of all linear controllers that provide internal stability of the closed-loop system can be achieved in the simplest and most natural way by analysing the system shown in Fig. 3 - the so-called basic structure. Problems of choosing the parameter to meet some important design specifications, viz. a robust asymptotic tracking of the reference signal with disturbance and noise rejection are also considered and illustrated by two representative examples covering the area of continuous- and discrete-time systems.