Temat: discrete control - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Solving a permutation problem by a fully polynomial-time approximation scheme
Autorzy:: Gawiejnowicz, Stanisław
Kurc, Wiesław
Pankowska, Lidia
Tematy:: combinatorial optimization
discrete control theory
fully polynomial-time approximation scheme; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/729290.pdf Link otwiera się w nowym oknie
Opis:: For a problem of optimal discrete control with a discrete control set composed of vertices of an n-dimensional permutohedron, a fully polynomial-time approximation scheme is proposed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling of Parameterized Discrete Control Algorithms With Use of Finite State Machines in TIA Portal Environment
Autorzy:: Andrzejewski, G.
Zając, W.
Tematy:: finite state machine
parameterised discrete control
process modelling
Ladder Diagram
TIA Portal; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226384.pdf Link otwiera się w nowym oknie
Opis:: There exist numerous modelling techniques and representation methods for digital control algorithms, aimed to achieve required system or process parameters, e.g. precision of process modelling, control quality, fulfilling the time constrains, optimisation of consumption of system resources, or achieving a trade-off between number of parameters. This work illustrates usage of Finite State Machines (FSM) modelling technique to solve a control problem with parameterized external variables. The structure of this work comprises six elements. The FSM is presented in brief and discrete control algorithm modelling is discussed. The modelled object and control problem is described and variables are identified. The FSM model is presented and control algorithm is described. The parameterization problem is identified and addressed, and the implementation in PLC programming LAD language is presented. Finally, the conclusion is given and future work areas are identified.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dead-beat and reaching-law-based sliding-mode control of perishable inventory systems
Autorzy:: Ignaciuk, P.
Bartoszewicz, A.
Tematy:: sliding-mode control
inventory control
perishable inventories
discrete-time control systems; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/202382.pdf Link otwiera się w nowym oknie
Opis:: In this paper we consider the problem of efficient control of inventory systems with perishable goods. In the analyzed setting the deteriorating stock at a distribution center used to fulfill unknown, time-varying demand is replenished with delay from a supply source. The challenging issue is to achieve the high service level with minimum costs when the replenishment orders are procured with lead-time delay spanning multiple review periods. On the contrary to the typical heuristic approaches, we apply formal methodology based on discrete-time sliding-mode (SM) control. The proposed SM controller with the sliding plane selected for a dead-beat scheme ensures that the maximum service level is obtained in the system with arbitrary delay and any bounded demand pattern. In order to account for the supplier capacity limitations in the systems with input constraints, we also develop an alternative control strategy based on reaching law. Both controllers achieve a given service level with smaller holding costs and reduced order-to-demand variance ratio as compared to the classical order-up-to policy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Interval arithmetic-based fuzzy discrete-time crane control scheme design
Autorzy:: Smoczek, J.
Tematy:: interval arithmetic
discrete-time control
fuzzy control
pole placement
anti-sway control; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201270.pdf Link otwiera się w nowym oknie
Opis:: In many manufacturing segments, container terminals and shipping yards the automation of material handling systems is an important element of enhancing productivity, safety and efficiency. The fast, precise and safe transfer of goods in crane operations requires a control application solving the problems, including non-collision trajectory planning and limitation of payload oscillations. The paper presents the interval arithmetic-based method of designing a discrete-time closed-loop anti-sway crane control system based on the fuzzy interpolation of linear controller parameters. The interval analysis of a closed-loop control system characteristic polynomial coefficients deviation from their nominal values is proposed to define a minimum number of fuzzy sets on the scheduling variables universe of discourse and to determine the distribution of triangular-shaped membership functions parameters, which satisfy the acceptable range of performances deterioration in the presence of the system’s parameters variation. The effectiveness of this method was proved in experiments conducted using the PAC system on the laboratory scaled overhead crane.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modelling of operational cycle of hydraulic drive of lifting mechanism on the basis of axial piston hydraulic machines with discrete control
Modelirovanie rabochego cikla gidroprivoda mekhanizma podema na osnove akcialno-porshnevykh gidromashin s diskretnym upravleniem
Autorzy:: Nikolenko, I.
Ryzhakov, A.
Tematy:: axial piston
hydraulic machine
hydraulic drive
discrete control
mathematical model
lifting mechanism
mechanical property
physical property; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/793352.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Discrete-time control systems on homogeneous spaces: partition property
Autorzy:: Jordan, J.
Tematy:: discrete-time control systems
inverse iteration
partition property
system semigroup; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/970004.pdf Link otwiera się w nowym oknie
Opis:: If the system semigroup of a control system is a roup, the system has the partition property, i.e., the reachable sets form a disjoint partition in the state space. The converse is ot true in general. In this work we give sufficient conditions for le partition property for a family of discrete-time control systems on homogeneous spaces. We apply our results to Inverse Iteration systems on flag manifolds, which are closely related to numerical aIgorithms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Odporny system sterowania ruchem drogowym bazujący na optymalizacji wielokryterialnej
Fault Tolerant Traffic Control System Based on Multiobjective Optimization
Autorzy:: Cieślewicz, Dobrosław
Tematy:: model matematyczny
ruch drogowy
sterowanie dyskretne
optymalizacja wielokryterialna
symulacja
mathematical model
traffic flow
discrete control
multiobjective optimisation
simulation; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/2068653.pdf Link otwiera się w nowym oknie
Opis:: Model matematyczny jest uproszczonym odwzorowaniem pewnych zjawisk, które uwzględnia jedynie cechy istotne. W dzisiejszych czasach coraz większym problemem stają się przeciążone infrastruktury drogowe, szczególnie w większych ośrodkach miejskich. Problem ten można w pewnym stopniu zredukować, stosując zaawansowane algorytmy sterowania. W niniejszym artykule podjęto próbę sterowania przepływem ruchu drogowego w skali makroskopowej. W tym celu użyto adaptacji dyskretnego, nieliniowego modelu matematycznego. Przy wykorzystaniu środowiska programistycznego MATLAB opracowano i zoptymalizowano układ sterowania niewielką siecią komunikacyjną. Następnie, zakładając przykładowy scenariusz, przeprowadzono dla tej sieci badania symulacyjne.
The mathematical model is a simplified representation of certain phenomena, which takes into account only the essential features. Nowadays, congested road infrastructures are becoming a growing problem, especially in larger urban centres. This problem can be somewhat reduced by using advanced control algorithms. This article attempts to control the traffic flow on a macroscopic scale. For this purpose, a discrete, nonlinear mathematical model was adopted. Using the MATLAB programming environment, a control system for a small communication network was developed and optimised. Then, assuming a sample scenario, simulation studies were conducted for this network.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Solving the Problem of Discrete Process Control Synthesis Using Optimization on a Sliding Interval
Autorzy:: Julayeva, Zhazira
Wójcik, Waldemar
Kashaganova, Gulzhan
Togzhanova, Kulzhan
Mambetov, Saken
Tematy:: discrete process control
optimization
sliding interval
equation of a closed loop system
closed loop control system; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/27311920.pdf Link otwiera się w nowym oknie
Opis:: The paper brings forward an idea of multi-threaded computation synchronization based on the shared semaphored cache in the multi-core CPUs. It is dedicated to the implementation of multi-core PLC control, embedded solution or parallel computation of models described using hardware description languages. The shared semaphored cache is implemented as guarded memory cells within a dedicated section of the cache memory that is shared by multiple cores. This enables the cores to speed up the data exchange and seamlessly synchronize the computation. The idea has been verified by creating a multi-core system model using Verilog HDL. The simulation of task synchronization methods allows for proving the benefits of shared semaphored memory cells over standard synchronization methods. The proposed idea enhances the computation in the algorithms that consist of relatively short tasks that can be processed in parallel and requires fast synchronization mechanisms to avoid data race conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Sliding mode control of periodic review perishable inventories with multiple suppliers and transportation losses
Autorzy:: Bartoszewicz, A.
Maciejewski, M.
Tematy:: discrete time sliding mode control
sliding surface design
inventory control; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200764.pdf Link otwiera się w nowym oknie
Opis:: The purpose of this paper is to develop robust and computationally efficient supply chain management strategy ensuring fast reaction to the demand variations for periodic review perishable inventory systems. For that purpose, we apply a sliding mode approach and we propose a new discrete time warehouse management strategy. The strategy employs the sliding hyperplane appropriately designed to ensure a dead-beat performance of the closed loop system. Our strategy not only explicitly takes into account decay of goods stored in the warehouse (perishing inventories) but it also accounts for transportation losses which take place on the way from suppliers to the warehouse. The proposed strategy ensures full customers’ demand satisfaction, minimizes the on-hand inventory volume and prevents from exceeding the warehouse capacity. This reflects the need of simultaneous minimization of the lost sales costs and inventory holding costs. Furthermore, the strategy ensures that the ordered quantities of goods are always non-negative and upper bounded. These favourable properties of the proposed strategy are formally stated as a lemma and three theorems and proved in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Active queue management with discrete sliding modes in TCP networks
Autorzy:: Ignaciuk, P.
Karbowańczyk, M.
Tematy:: sliding-mode control
congestion control
active queue management
AQM
discrete-time control systems
kontrola przeciążenia
aktywne zarządzanie kolejką
dyskretne systemy kontroli; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201360.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a new active queue management (AQM) algorithm for data traffic control in TCP/IP networks is developed. The algorithm design is based on the principles of discrete sliding-mode control. Unlike majority of earlier studies, the design procedure considers the effects of both non-negligible delay in transferring data and feedback information and unpredictable capacity variations. The switching function is selected to incorporate a delay compensation mechanism, which ensures efficient network operation even for large bandwidthdelay product connections. The proposed algorithm, implemented as a packet marking scheme, is tested in discrete event ns-2 simulator. The results show that the algorithm provides fast convergence to steady state after sudden, unanticipated capacity changes. By generating smaller overshoots, the proposed algorithm also allows for reducing buffer space requirements to avoid packet loss as compared to the benchmark AQM solutions.
Dostawca treści:: Biblioteka Nauki

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