Wyniki wyszukiwania - Biblioteka Nauki

1

Robust control of the inventory level in warehouses systems

100%

Adamski A. , Więcek P.

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2014

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tom nr 6

1379--1389

EN

In the paper the inventory level optimal control problem was presented and solved. The crucial control specification is created by representative prediction of stochastic demand of the goods buyers which creates the reference for adequate control problem formulation. The minimized control performance criterion represents the sum of inventory surplus related holding costs and demand surplus related ordering costs including of delivery time, which directly leads to optimal inventory level optimization. For this problem the stochastic demand prediction problems were solved and verified by adequate models. After that the dedicated dynamic stochastic inventory level control problem with predicted demand treated as references was solved. The original results confirm high practical utility of the proposed approach.

PL

W artykule przedstawiono problem sterowania poziomem zapasów w magazynie. Kluczową specyfikacją dla tego problemu jest reprezentatywna predykcja stochastycznego popytu na towary stanowiąca punkt odniesienia dla sformułowania adekwatnego problemu sterowania. W problemie tym minimalizowane kryterium reprezentuje sumę nadmiernych kosztów związanych z nadmiernym przechowywaniem lub zamawianiem towarów w magazynie co sprowadza się do zapewnienia właściwego z perspektywy popytu poziomu zapasów w magazynie. Dla potrzeb sterowania rozwiązano i zweryfikowano więc najpierw problemy predykcji stochastycznego popytu stosując reprezentatywne modele. Następnie sformułowano i rozwiązano dedykowany dynamiczny problem sterowania zapasami dla którego przewidywany popyt stanowił punkt odniesienia przy optymalizacji. Otrzymane wyniki są oryginalne i potwierdzają dużą użyteczność praktyczną proponowanego podejścia.

2

One DOF robot manipulator control through type-2 fuzzy robust adaptive controller

59%

Naderolasli A. , Chatraei A.

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tom Vol. 13, No. 1

65--70

EN

In this article, the one DOF robot manipulator control is assessed through second type robust fuzzy-adaptive controller. The objective is to obtain a tracking path with appropriate accuracy. The stability of the closed loop system is verified through Lyapunov stability theory and the efficiency of tracking is analyzed subject to the constraints and uncertainty. In order to design the fuzzy controller a set of if-then fuzzy rules are considered which describe the system input-output behavior. Simulation and the results of the experiments on the one DOF robots indicate the effectiveness of the proposed methods.

3

Analiza ram stalowych w kontekście odporności konstrukcji

59%

Kukla D. , Kozłowski A.

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tom R. 79, nr 1-2

55--59

PL

W artykule przedstawiono wyniki dynamicznych analiz numerycznych stalowych konstrukcji ramowych poddanych symulacji scenariusza usunięcia słupa wewnętrznego. Analizy wykonano, opierając się na zwalidowanych modelach numerycznych na podstawie badań doświadczalnych stalowych węzłów doczołowych. Wyniki analiz podsumowano praktycznymi zaleceniami projektowymi kształtowania śrubowych stalowych węzłów doczołowych w sytuacji wyjątkowej utraty słupa środkowego.

EN

Result of dynamic numerical analysis of steel frames subjected to simulation of internal column loss scenario has been presented. The analysis was performed on the validated numerical models based on the experimental tests of steel end-plate joints. Results of analysis were summarized by practical design recommendations how shaping bolted steel end-plate joints under accidental design situation.

4

Robust - współbieżna biblioteka sterowania robotem mobilnym

59%

Kułakowski K.

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tom R. 15, nr 12

144-145

PL

Robust to biblioteka warstwy pośredniczącej stworzona z myślą o wysokopoziomowym sterowaniu konstrukcjami robotycznymi. Obecnie dostępne są dwie implementacje Robust, odpowiednio dla konstrukcji Lego Mindstorms NXT oraz Hexor II firmy Stenzel.

EN

Robust is a middleware library designed to facilitate the high-level control of different robotics platforms. Currently there are two Robust's implementation available: Robusts for Lego Mindstorms NXT and Robust for Hexor II (Stenzel).

5

Speed control of doubly fed induction motor using backstepping control with interval type-2 fuzzy controller

59%

Herizi A. , Rouabhi R. , Zemmit A.

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tom Vol. 24, No. 3

art. no. 2023301

EN

The control of the doubly-fed induction motor is a complex operation because of this motor characterised by a non-linear multivariable dynamics, having settings that change over time and a significant link between the mechanical component and magnetic behavior (flux) (speed and couple). This article then proposes a new strategy of a robust control of this motor, which is decoupled due to the stator flux’s direction. The proposed control is integrated with the backstepping control which based on Lyapunov theory; this approach consists in constructively designing a control law of nonlinear systems by considering some state variables as being virtual commands, and the important branch of artificial intelligence type-2 fuzzy logic. The hybrid control backstepping-fuzzy logic consists in replacing the regulators applied to the backstepping control by regulators based on type-2 fuzzy logic. This control will be evaluated by numerous simulations where there is a parametric and non-parametric variation.

6

Statistical methods and algorithms for spatio-temporal cluster analysis

59%

Abramovich M. , Mitskevich M.

Studia Informatica : systems and information technology

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2017

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tom Vol. 1-2(21)

5--14

EN

The global clusterization test and scan statistic method for studying geographical distribution of the objects are considered. The algorithm of windows set construction for the flexible spatial was developed. The robust version of spatial scan statistic method is proposed. The children carcinoma of the Belarus was analyzed using scan statistic method.

7

Robust continuous third-order finite time sliding mode controllers for exoskeleton robot

48%

Fellag R. , Guiatni M. , Hamerlain M. , Achour N.

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tom LXVIII, nr 4

395--414

EN

In this work, continuous third-order sliding mode controllers are presented to control a five degrees-of-freedom (5-DOF) exoskeleton robot. This latter is used in physiotherapy rehabilitation of upper extremities. The aspiration is to assist the movements of patients with severe motor limitations. The control objective is then to design adept controllers to follow desired trajectories smoothly and precisely. Accordingly, it is proposed, in this work, a class of homogeneous algorithms of sliding modes having finite-time convergence properties of the states. They provide continuous control signals and are robust regardless of non-modeled dynamics, uncertainties and external disturbances. A comparative study with a robust finite-time sliding mode controller proposed in literature is performed. Simulations are accomplished to investigate the efficacy of these algorithms and the obtained results are analyzed.