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Tytuł:
Eliminacja zjawiska chatteringu w układach sterowania o zmiennej strukturze z ruchem ślizgowym
Elimination of the chattering in variable structure control systems with sliding motion
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/152239.pdf
Data publikacji:
2001
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Źródło:
Pomiary Automatyka Kontrola; 2001, R. 47, nr 4, 4; 8-10
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Sliding Mode Control of Discrete-Time Systems
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/908266.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie
system dyskretny
sliding-mode control
discrete-time systems
Opis:
A reaching law approach to the design of discrete-time quasi-sliding mode control systems is considered. First the required position of the system representative point with reference to the sliding plane is specified, and then novel control strategies, which drive the system in such a way that the position actually changes according to the specification, are proposed. The strategies are linear and consequently the undesirable chattering and high-frequency switching between different values of the control signal are avoided. Furthermore, the state of the controlled system is driven to the narrowest possible band around the sliding plane. The strategies, when compared with previously published results, are simpler and they guarantee favourable performance of the controlled systems while using essentially reduced control effort.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 801-810
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technika jako narzędzie kształtowania krajobrazu
Technology as an instrument of landscape formation
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1186121.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
technika
krajobraz
kształtowanie
technika rekultywacji
oczyszczanie hydrobotaniczne
środowisko naturalne
technology
landscape
formation
reclamation technique
hydro-botanical purification
environment
Opis:
The article discusses a changing understanding of technology significance with reference to the landscape and environment: from the instrument of "bringing nature under control" to the mean of its protection and bringing back to equilibrium. Technical ways of wastelands reclamation and revitalisation are discussed together with the examples of using recovered areas for recreational purposes and their meaning in the city structure - the case of a liquid fuels base in Gdańsk and the Seaside Strip between Brzeźno and Jelitkowo in Gdańsk. Land reclamation techniques and the conditions of their applications, methods of city soil detoxification with phytoremediation methods between them are also presented. The technologies take advantage of living organisms (plants) ability to remove contaminants from the environment. Also methods of hydrobotanical waste-water treatment and sludge utilisation are based on self-purification properties of the environment. By choosing species of the proper kind, also energetic meaning of the systems is possible to achieve. Finally, ethical aspects of decisions concerning particular technical solutions application are discussed and also, connected with them, notions of eco-ethics, ecological ethics, environmental ethics and the conception of so called proper technology application; as well as a place of technology in the context of revitalisation, understood as a continuous process taking social, economic, administrative and ecological sphere under consideration.
Źródło:
Architektura Krajobrazu; 2004, 1-2; 4-13
1641-5159
Pojawia się w:
Architektura Krajobrazu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany zawartości rozpuszczalnych w wodzie form niektórych składników mineralnych w glebie płowej pod kilkuletnim zadrzewieniem śródpolnym
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/805810.pdf
Data publikacji:
2001
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2001, 478
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Migracja fosforanow w glebach i wodach zlewni rolniczej na terenie Rowniny Koscianskiej
Autorzy:
Bartoszewicz, A
Powiązania:
https://bibliotekanauki.pl/articles/801694.pdf
Data publikacji:
2005
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
fosforany
gleby
zawartosc fosforanow
wody powierzchniowe
zlewnie rolnicze
wody gruntowe
Rownina Koscianska
migracja
Opis:
Migrację fosforanów w glebach i wodach zlewni rolniczej analizowano na podstawie ich stężenia w wodzie cieku głównego w sieci melioracyjnej oraz ich zawartości w wodach gruntowych i wyciągach wodnych z glebowych past nasyconych. Średnie roczne wartości stężenia jonów P0₄⁻³ w wodzie cieku w latach 1992 - 1999 oraz 2002 - 2004 (uzyskane na podstawie analiz prowadzonych w odstępach kilkutygodniowych z dwóch przekrojów pomiarowych) świadczą o dużych wahaniach tego składnika nawet w skali roku (od 0,11 do 0,82 mg P0₄·dm⁻³). W wodach gruntowych zalegających pod polami uprawnymi średnie stężenia fosforanów kształtujące się najczęściej na poziomie około 0,2 mg P0₄·dm⁻³ wskazują na znaczną migrację wgłębną tego składnika w profilu glebowym.
Migration of phosphates in soils and waters of the agricultural catchment basin was analysed on the basis of their concentrations in water of the main water course of the drainage system as well as their concentrations in ground waters and water extracts from saturated soil-pastes. Mean annual values of the P0₄ ion concentration in the water course in the years 1992 - 1999 and 2002 - 2004 (obtained on the basis of analyses carried out at several week intervals from two measurement cross-sections) revealed considerable fluctuations of this component even in during of one year (from 0.11 to 0.82 mg P0₄·dm⁻³). Mean phosphate concentrations found in ground waters sampled under arable lands and determined at the level of about 0.2 mg P0₄·dm⁻³ showed a significantly deep migration of this component in the soil-climatic conditions of the studied catchment basin. This was also evidenced by periodic, relatively high, concentrations of water soluble forms of this component at individual depths of the soil profile.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2005, 505; 41-49
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chattering attenuation in sliding mode control systems
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/206731.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nieliniowy system sterowania
nonlinear control system
compensation
control nonlinearities
sliding mode control
variable structure systems
Opis:
In this paper sliding mode control systems are considered and a new technique to attenuate chattering is proposed. The technique employs simple, first-order dynamical devices, i.e. an integrator or a low-pass filter, to compensate in part for unknown and changing disturbance. As a result of this compensation, the magnitude of the discontinuous control term is essentially reduced. The term does not depend on the admissible disturbance or its change rate, but only on the uncertainty of the disturbance at the initial time t = t[sub o]. The technique proposed in this paper attenuates the undesirable chattering without any deterioration of the system performance.
Źródło:
Control and Cybernetics; 2000, 29, 2; 585-584
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dead-time compensation in continuous-review perishable inventory systems with a remote supply source
Autorzy:
Ignaciuk, P.
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/229449.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inventory control
perishable inventory systems
time-delay systems
Smith predictor
Opis:
In this paper we address the problem of efficient control of continuous-review perishable inventory systems. In the considered systems the goods at a distribution center used to fulfill unknown, variable demand deteriorate at a constant rate, and are replenished with delay from a remote supply source. We develop a new supply policy which incorporates the Smith predictor for dead-time compensation. A number of properties of the designed policy is formulated, and strictly proved. In particular, we show that the policy guarantees that the assigned storage space at the distribution center is never exceeded which means that the cost of emergency storage is eliminated. Moreover, we show that with appropriately chosen controller parameters all of the demand imposed at the distribution center is realized from the readily available resources, thus ensuring the maximum service level.
Źródło:
Archives of Control Sciences; 2011, 21, 1; 61-84
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dead-Beat and reaching law based sliding mode control laws for perishable inventories with transportation losses
Autorzy:
Bartoszewicz, A.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/229507.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding mode control
perishable inventories
inventory control
Opis:
This paper describes discrete sliding mode (SM) supply management strategies for inventory systems with perishable goods and transportation losses. In the considered systems, the stock used to satisfy the unknown, bounded and time-varying demand is replenished with some delay from a distant supply source. The on-hand stock deterioration during lead-time delay, as well as commodity losses in supply process are explicitly taken into account. Two supply management strategies are proposed. The first one ensures fast reaction to the imposed demand variations, but may result in excessive control signal magnitude at the beginning of the inventory management process. Therefore, in order to conform to supplier limitations we also develop an alternative control strategy based on the concept of the reaching law. That strategy helps reduce the initial supply rate and satisfy the supplier limitations. A number of desirable properties of both proposed strategies are formulated and formally proved. These properties include full customer demand satisfaction and elimination of the risk of exceeding the warehouse capacity.
Źródło:
Archives of Control Sciences; 2012, 22, 3; 255-272
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dzieje kartografii miast polskich do końca XIX wieku. Zarys problematyki
History of the cartography of Polish cities until the end of the 19th century
Autorzy:
Bartoszewicz, A.
Bartoszewicz, H.
Powiązania:
https://bibliotekanauki.pl/articles/971687.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
lokacja miast
prawo miejskie
panorama miasta
mapa wielkoskalowa
plan lokacyjny
założenia urbanistyczne
plan regulacyjny
city location
urban law
city panoramas
large scale maps
location plans
urbanization plan
regulation plans
Opis:
Przedmiotem artykułu jest próba przedstawienia zarysu dziejów kartografii miast polskich od XVI do końca XIX wieku. Cezurę początkową stanowią najstarsze zachowane kartografika miejskie, natomiast cezurę końcową „produkcja" kartograficzna towarzysząca regulacji miast Królestwa Polskiego po tzw. reformie miejskiej lat 1869-1870 i pierwsze mapy lindleyowskie. Podstawę źródłową artykułu stanowią kartografika przechowywane w zbiorach polskich. Autorzy artykułu wykorzystali także wydawnictwa źródłowe i katalogi dotyczące map wielkoskalowych miast Rzeczypospolitej i miast pozostających obecnie w granicach państwa polskiego. Uwzględniono prace kartografów polskich i obcych pracujących na rzecz polskich odbiorców, a także cudzoziemców, głównie inżynierów wojskowych służących w armiach, które prowadziły wojny na ziemiach Rzeczypospolitej.
The authors attempt to present the history of cartography of Polish cities from the 16th until the end of the 19th century. The oldest preserved city maps constitute the initial caesura and the cartographic 'production' accompanying the regulation of cities of the Kingdom of Poland after the so called city reform of 1869-1870 and W. Lindley's first maps - constitutes the final caesura. Maps and plans stored in Polish collections form the article's source basis. The authors have also used source publications and catalogues of large scale maps of the Polish-Lithuanian Commonwealth and of cities which are currently included within the boundaries of the Polish state. There have remained only few large scale 16th century maps. There exist individual copies, mainly of large cities or of those which were strategically important and had fortifications. They were made in connection with urban processes and construction activity. Large scale maps were also made to settle ownership rights and for fiscal reasons. G. Braun's and F. Hogenberg's plans and city views are among the most valuable works of urban cartography. However, the maps made during the 17th century and the beginning of 18th century wars in Poland have higher recognize value. The most valuable among those are the works of a Swedish army engineer, general E. J. Dahlbergh. They were published in part in the work of S. Pufendorf. Urban cartographic 'production' increased in the 18th century. During the reign of August II and August III, mainly two kinds of elaborations were made: 1) maps of Polish cities besieged during the wars fought at the beginning of the 18th century and 2) city plans, mainly of Warsaw, made in connection with urban and construction activity of Saxons. Cartography, including large scale cartography, thrived during the reign of king Stanisław August Poniatowski. During that time, not only maps being the result of the king's urban and construction activity were made, but also plans elaborated for such city institutions as the Paving Committee and the Boni Ordinis Committee. The authors of large scale city maps of Poland were the best contemporary cartographers and architects, such as PR. de Tirregaille, A. Hiz, H. Jedrzejowski, M. Deutsch, J. Fontana and D. Merlini. The most numerous among the maps which have survived up to this day are the maps created in the 19th century. The partitioning states' cartographic 'production' after the third partitioning of Poland (1795) mainly concerned ownership and fiscal matters. In the period of the Duchy of Warsaw, city plans were mainly made in connection with fortification works conducted at the time. Urban cartography grew most dynamically during the constitutional period of the Kingdom of Poland (1815-1830). In order to make large scale maps of Warsaw, knowledge and organizational potential of military topographic services were used. In urban cartography, methods and models obligatorily used until the end of the 19th century were created. Also in the period of conducting regulation works which followed the implementation of the so called urban reform, many large scale urban maps were created. In the history of Polish city cartography, the 19th century is concluded with cartographic works done in connection with the construction of water supply and sewer system in Warsaw.
Źródło:
Polski Przegląd Kartograficzny; 2013, T. 45, nr 3, 3; 236-255
0324-8321
Pojawia się w:
Polski Przegląd Kartograficzny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Flow Controllers for a Single Virtual Circuit in Data Transmission Networks with Lossy Links
Autorzy:
Bartoszewicz, A.
Leśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/108780.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
data transmission networks
congestion control
sliding-mode control
discrete-time systems
Opis:
The paper concerns an application of regulation theory methods to modeling and effective control of connection-oriented data transmission networks. In particular the problem of congestion control in a single virtual circuit of such a network is considered and new discrete-time sliding mode data flow rate controllers are proposed. The controllers are designed in such a way that packet losses are explicitly accounted for. The closed-loop system stability and finitetime error convergence are proved. Moreover, a number of favorable properties of the proposed controllers are stated as theorems, formally proved and verified in a simulation example. It is demonstrated that the proposed controllers guarantee full utilization of the available bandwidth and eliminates the risk of bottleneck node buffer overflow. Application of time-varying sliding hyperplanes helps avoid excessive transmission rates at the beginning of the control process.
Źródło:
Journal of Applied Computer Science Methods; 2012, 4 No. 1; 5-20
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An optimal sliding mode congestion controller for connection-oriented communication networks with lossy links
Autorzy:
Bartoszewicz, A.
Leśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/330586.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optimal control
sliding mode control
flow control
discrete-time system
sterowanie optymalne
sterowanie ślizgowe
sterowanie przepływem
układ dyskretny
Opis:
A new discrete-time sliding-mode congestion controller for connection-oriented networks is proposed. Packet losses which may occur during the transmission process are explicitly taken into account. Two control laws are presented, each obtained by minimizing a different cost functional. The first one concentrates on the output variable, whereas in the second one the whole state vector is considered. Weighting factors for adjusting the influence of the control signal and appropriate (state or output) errors are incorporated in both the functionals. The asymptotic stability of the closed-loop system is proved, and the conditions for 100% bottleneck node bandwidth utilization are derived. The performance of the proposed algorithm is verified by computer simulations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 1; 87-97
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ABR traffic control over multi-source single-bottleneck ATM networks
Autorzy:
Bartoszewicz, A.
Molik, T.
Powiązania:
https://bibliotekanauki.pl/articles/907264.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
kontrola przeciążenia
sieć ATM
układ z opóźnieniem
predyktor Smitha
congestion control
ATM networks
time-delay systems
Smith principle
Opis:
The problem of flow control in fast, connection-oriented communication networks supporting the traffic generated by multiple sources is considered. A novel sampled time strategy governing the behaviour of the sources is proposed. The strategy combines the Smith principle with the conventional sampled time proportional controller. It guarantees an equal resource allocation between various users, full bottleneck link utilisation and no cell loss in the controlled network. Consequently, the need for cell retransmission is eliminated and a high throughput is ensured. Furthermore, transmission rates generated by the algorithm are limited. This property permits a direct implementation of the proposed strategy in the network environment. A simulation example confirms favourable performances of the proposed control scheme.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 43-51
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dead-beat and reaching-law-based sliding-mode control of perishable inventory systems
Autorzy:
Ignaciuk, P.
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/202382.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding-mode control
inventory control
perishable inventories
discrete-time control systems
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.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 39-49
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode control of periodic review perishable inventories with multiple suppliers and transportation losses
Autorzy:
Bartoszewicz, A.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200764.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete time sliding mode control
sliding surface design
inventory control
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.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 885-892
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Rational cultivation of chemically contaminated soils near the copper smelter
Racjonalne zagospodarowanie gleb chemicznie skażonych w sąsiedztwie huty miedzi
Autorzy:
Mocek, A.
Owczarzak, W.
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402322.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
Acta Agrophysica; 2001, 56; 189-198
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
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