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1
Content available Methodological Procedures Applied to the Manufacturing Systems Design
Daneshjo Naqib
Advances in Science and Technology. Research Journal
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2020
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Vol. 14, no 4
86--95
EN
The designing activity has to result in completely new autonomous units sections of complex manufacturing processes and their systems. The solutions must be related to a number of new issues, not only of a technical and technological nature. The solutions designed for new types of interactions between people and technology will be required, and so will be the necessary skills and knowledge. New legal, security, economic, political and ethical solutions to relevant issues will be needed.
2
Content available remote The EPC II theory. The structure of business process control systems
Zaborowski M.
Management and Production Engineering Review
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2011
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Vol. 2, No. 1
61-77
EN
The paper is the third one of publications on the EPC theory. The acronym EPC has been replaced with EPC II to avoid confusing Enterprise Process Control with Event-driven Process Chain, which is a well known method of modeling process structures. Basic notions of the EPC II theory have been discussed in the paper using the example of a two-level business process, which is an educational model of production of housing parts of the final product in a household goods factory. For the higher level the follow-up production control system has been presented. For the lower level the central control of a business process has been discussed. For all examples tables of their relational models have been shown. The paper presents the EPC II notation for graphical modeling business processes and their control systems. It uses only 4 symbols from UML activity diagrams - structured activity, action, data store and object flow. It has been shown that business process models, expressed with notations of UML, BPMN, EPC, CPN may be always transformed to EPC II activity diagrams. What is more, with EPC II notation one can present not only structure of business processes in any organizational level of an enterprise, but also structure of their control systems.
3
Content available remote The EPC theory. Couplings between transitions in enterprise process control systems
Zaborowski M.
Management and Production Engineering Review
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2010
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Vol. 1, No. 4
77-92
EN
The paper is the second one of publications on the EPC theory. Relationships between transitions and activity transition units, as well as definitions of functional and control transitions of the framework EPC system, have been presented in it. Then classification of transitions by their attribution to different functional layers and data processing phases in EPC systems has been shown. The resource inputs and outputs have been defined for functional and control transitions. System couplings, as well as input and output resource couplings, between functional and control transitions have been defined by analogy of correspondingcouplings between functional and control units. Tight relationships between structures of an enterprise management system and a corresponding information system have been presented. These are relationships between the structure of associations of functional and control units with information places and the structure of analogous associations of transitions with places. Next, couplings of central coordination transition with local transitions of horizontal coordination have been discussed. On these grounds the notion of a distributed process has been introduced and the definition of a business process has been specified.
4
Content available remote The EPC theory. Basic notions of enterprise process control
Zaborowski M.
Management and Production Engineering Review
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2010
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Vol. 1, No. 3
75-96
EN
The essential part of the theory of Enterprise Process Control (the EPC theory) is a formal description of the framework EPC system. It is a universal reference model of integrated management and process control systems for all enterprises, regardless of their trade and size. Basic notions of the EPC theory have been presented in the paper. Certain definitions of broadly known terms (e.g. organizational system, process, resource, control unit, functional layer) are slightly different than the ones that are most often formulated. The purpose of these modifications is precise presentation of relationships between defined notions. Furthermore many new notions (functional subsystem, functional unit, transition unit, information place, reengineering layer, readiness variant, organizational resources and the like) have been introduced. They are necessary for presenting organizational and functional structure of the framework EPC system. The EPC theory has deductive nature and its notions are formulated on the basis of the more general, previously defined ones.
5
Content available remote Elimination of subtractive and quasi-redundant levels in multi-cell converters
Orlik B., Christ T.
Przegląd Elektrotechniczny
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2007
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R. 83, nr 10
54-58
EN
The multi-cell converter, which is becoming increasingly popular in the medium voltage drives market, possesses a number of undesirable switching states which diminish efficiency of the system. These conditions lead to circulating power among the cells, dc-link instability and superfluous switching between states. In this paper the undesirable states are identified and the concept of subtractive levels is introduced. Calculations show the impact of eliminating these states on the number of available output voltage levels for three- and five-cell converters. Through simulations, optimized dc-link configurations are identified and investigated in a power converter model. DC-link stability can be significantly improved by the exclusion of subtractive levels, while THD is not affected much. Converters which use four-quadrant supplies for the cells can achieve efficiency improvements by avoiding power conversion loops between the cells and simpler converters using single quadrant supplies can minimize dc-link capacitive energy storage.
PL
Kaskadowy przekształtnik wielokomórkowy, coraz chętniej stosowany w napędach średniego napięcia, charakteryzuje się pewną ilością niepożądanych stanów łączeniowych, zmniejszających efektywność całego systemu. Takie stany prowadzą do cyrkulacji mocy pomiędzy komórkami, niestabilności w obwodzie pośredniczącym DC oraz zbytecznych przełączeń pomiędzy stanami. W artykule przeprowadzono identyfikację niepożądanych stanów przekształtnika oraz wprowadzono koncepcję poziomów subtrakcyjnych. Obliczenia pokazują wpływ eliminacji tych stanów na liczbę dostępnych poziomów napięcia wyjściowego w przekształtniku trzy- i cztero-komórkowym. Na podstawie modelu symulacyjnego przekształtnika wydzielono i przeprowadzono badania optymalnych konfiguracji obwodu pośredniczącego DC. Pokazano, że stabilność obwodu DC można znacząco poprawić przez eliminację poziomów subtrakcyjnych, co nie wpływa w istotny sposób na wartość THD. Przekształtniki, w których stosuje się cztero-kwadrantowe zasilanie komórek, mogą osiągać wyższą sprawność przez wystrzeganie się tworzenia pętli przepływu mocy pomiędzy komórkami, a proste przetwornice zastosowane do zasilania jedno-kwadrantowego pozwalają zminimalizować pojemnościowy zasobnik energii w obwodzie DC.
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