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1
Content available Modelling the set of earthworks machinery with the use of computer simulation
Rogala Wojciech, Anysz Hubert
Przegląd Naukowy Inżynieria i Kształtowanie Środowiska
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2019
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Vol. 28, No. 1
161--168
EN
The paper presents the comparison of deterministic and stochastic approach for modeling the set of earthworks machinery. Simulation takes into account the normal distribution of cycle time and efficiency of machines and points out its influence for total construction works time. Results of the simulation indicate the need of identification time and efficiency deviation as a risk factor, which can cause delay whenever earthworks cycle includes the serial work of several machines.
2
Content available Designing technology in the age of digitalization: needs for technology assessment and ethics
Grunwald Armin
Multidisciplinary Aspects of Production Engineering
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2019
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Vol. 2, Iss. 1
612--623
EN
Technology research, design, and development is confronted with rapidly advancing digitalization in two respects: (1) digitally supported or enabled technologies need to be designed and developed, and (2) the respective R&D processes themselves will happen in a much more digitalized environment. Technology design generally must take into account the values involved and possible consequences of the development and use of the resulting products, services, and systems. In a digitalizing environment, the issue of values gains even more significance because more and more close and intimate interfaces between humans and technology have to be shaped. Designing human-machine interfaces is not only a functional issue but touches upon ethical questions such as the distribution of responsibility, but also upon anthropological issues related to the human self-image and ideas about future society as well. In the respective research, design, and development processes, value-laden issues such as control, privacy, empathy, responsibility, and accountability must be taken into account beyond technical issues of efficiency and reliability. The need for designing and shaping digital future technologies involving ethics and technology assessment will be demonstrated by three examples: future industrial production and the fields of self-driving cars and care robots. Value sensitive design and responsible research and innovation will be introduced as approaches to deal with these challenges.
3
Content available remote Proper montage and geometrical parameters as a criterion for the computer aided design of manufacturing cycle for screws
Skóra M., Pietrzyk M.
Computer Methods in Materials Science
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2014
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Vol. 14, No. 1
75--85
EN
Paper presents an application of numerical modelling to the design of the best manufacturing technology for fasteners. Imbus screw M6x20 was selected as an example. Since simulation of the one case of manufacturing requires very long computing times, application of classical mathematical optimization was not possible. Therefore, an approach known as variant optimization was applied. In this approach trial and error method is combined with the knowledge of the expert. The objective was to improve the shapes of the fibres in the forging and to improve the contact between the head of the screw and the material being joined. Finite element method was used to simulate the whole manufacturing chain. The model was validated and its good accuracy was confirmed. Various variants of the technology were simulated and new technological parameters were proposed, which gave noticeable improvement of the objective function.
PL
W artykule przedstawiono zastosowanie numerycznego modelowania do projektowania najlepszej technologii wytwarzania elementów złącznych. Jako przykład do analizy wybrano śrubę imbusową M6x20. Ponieważ symulacja jednego przypadku wytwarzania śruby wymaga bardzo długich czasów obliczeń, zastosowanie klasycznych metod optymalizacji nie było możliwe. Dlatego zastosowano podejście znane jako optymalizacja wariantowa, w której metoda prób i błędów jest połączona z wykorzystaniem wiedzy eksperta. Celem optymalizacji była poprawa kształtu włókien oraz poprawa styku śruby z łączonym materiałem. Do symulacji cyklu wytwarzania śruby zastosowano metodę elementów skończonych. Weryfikacja modelu wykazała jego dobrą dokładność. Przeprowadzono symulacje różnych wariantów technologicznych i zaproponowano wariant, który dał znaczną poprawę funkcji celu.
4
Content available Application of the expert computer system to design the hot strip rolling technology in the LPS line
Rauch Ł., Gołąb R., Kuziak R., Pidvysots'kyy V., Pietrzyk M.
Prace Instytutu Metalurgii Żelaza
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2012
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T. 64, nr 1
104-109
EN
Application of computer systems in industry becomes more and more frequent, in particular in those companies which are exposed to fast changes in the market due to the changing needs of products consumers. In the metals processing industry, these changes concern mainly the properties of semiproducts and products. Usually series of costly experimental trials are performed to meet these requirements. Therefore, there is a need for computer systems, which will aid design of the technology and allow decreasing the number of experimental trials. Details of the expert system applied to the analysis and optimization of the hot strip rolling technology in the semi-industrial rolling line (LPS) are described in the paper. Constructional multi-phase (CP) steel was selected for the analysis. Material models, developed for the investigated steel on the basis of experimental tests carried out at the Institute for Ferrous Metallurgy, were implemented in the system. Results of performed numerical simulations using the system are presented.
PL
Zastosowanie systemów komputerowych w przemyśle jest coraz częstsze, co szczególnie jest widoczne w przedsiębiorstwach nastawionych na bezpośredni kontakt ze zmieniającymi się potrzebami klientów. W przetwórstwie metali ma to przede wszystkim odzwierciedlenie w zapotrzebowaniu klientów na specyficzne własności półproduktów i wyrobów finalnych. Aby sprostać tym wymaganiom, zwykle konieczne jest podjęcie wielu kosztowych analiz doświadczalnych, które metodą prób i błędów dają oczekiwany rezultat. Dlatego potrzebne są systemy komputerowe oferujące funkcjonalność hybrydową, łączącą symulacje numeryczne, optymalizację i wiedzę ekspercką wspomagającą projektowanie technologii. W artykule przedstawiono szczegóły projektu oraz implementacji systemu, który został wykonany dla wspomagania projektowania technologii z wykorzystaniem Linii Półprzemysłowej Symulacji (LPS). Możliwości systemu przedstawiono na przykładzie stali konstrukcyjnej CP. W systemie zaimplementowano modele dla tej stali opracowane na podstawie badań wykonanych w IMŻ. W artykule zaprezentowano wyniki symulacji numerycznych wykonanych z wykorzystaniem zaproponowanego systemu.
5
Content available System for flexible modelling of production cycles based on flat rolling
Rauch L., Madej L., Golab R., Pietrzyk M.
Journal of Machine Engineering
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2009
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Vol. 9, No. 4
39--48
EN
The paper presents design and implementation of computer system dedicated to simulation of production cycles based on the rolling processes. The main functionality of the computer system, i.e. support and facilitation of flat rolling technology design, is obtained through flexible interface combined with the modular architecture of numerical library and optimization procedures. Each production cycle (e.g. heating, rolling, cooling, coiling) is prepared to be calculated separately and finally integrated into the sophisticated production cycle. The architecture of designed software as well as models used for numerical calculations are described in details.The system was tested for various configurations of rolling mills. Three of them together with obtained results are presented in the paper: complex production cycle (roughing and finishing rolling), finishing rolling composed of seven passes and laboratory case study.
6
Content available remote The determination of the thickness of the composite layers
Baron C., Bartocha D., Szajnar J.
Archives of Computational Materials Science and Surface Engineering
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2009
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Vol. 1, nr 3
139-147
EN
Purpose: In this article, the results of thermal simulation of composite layer formation on the steel model casting are shown. The main aim of researches was to work out the technological parameters of composite layer formation process, for which it is possible to get good quality reinforcement layer with desirable thickness. Design/methodology/approach: Both the distribution of temperature in model casting and the course of temperature changes in characteristic points of composite premould, were determined for assumed changes of the chosen technological parameters. The numerical calculations were conducted with the use of software NovaFlow&Solid 2.9 r81. Findings: Both the good quality and the desirable thickness of the composite layer depend on the parameters of process and the pouring temperature during the casting process. Research limitations/implications: Researches made possible to determine technological parameters, which have an direct effect on this process, and the criterions, which should be taken by casting technology of this kind of casting. Practical implications: Thanks to obtained results, it is possible to work out the guidelines and rules for projecting the construction and the selection of technological parameters of casting with the surface composite layer. Originality/value: The obtained results and the analysis of them allow to determine the basic guidelines for designing technology and construction of casting with the composite layer.
7
Content available remote The determination of the composite layer thickness with the use of software NovaFlow&Solid and Preforma 1.1
Baron C., Bartocha D., Szajnar J.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 1
5-12
EN
In this article the results of thermal simulation of formation composite layer on steel model casting were presented. The aim of researches was to determine the technological parameters of formation composite layer process for which it is possible to get good quality reinforcement layer with desirable thickness. Methodology. Both the distribution of temperature in model casting and the course of temperature changes in characteristic points of composite premould were determined for assumed changes of chosen technological parameters. The numerical calculations were done with the use of software NovaFlow&Solid 2.9 r81. Finding. Obtaining both the good quality and desirable thickness of composite layer depends on the parameters of process and the level of pouring temperature during the casting process. Research implications. Researches made possible to determine technological parameters directly influencing this process and criterions which should be kept by casting technology of this kind of casting. Practical implication and value. Thanks to obtained results there is a possibility to work out guidelines and rules of projecting the construction and the selection of technological parameters of casting with surface composite layer.
8
Content available remote Thermal simulation of process formation composite layer on model casting
Baron C., Bartocha D., Gawroński J.
Journal of Achievements in Materials and Manufacturing Engineering
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2006
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Vol. 18, nr 1-2
51--54
EN
Purpose: In article the results of thermal simulation of formation composite layer on model cast steel casting process have been presented. The aim of researches was determination of technological parameters of formation composite layer process for which is possible to obtain good quality reinforcement layer with desirable thickness. Design/methodology/approach: For assumed changes of chose technological parameters, distribution of temperature in model casting as well as course of temperature changes in characteristic point of composite insert have been determined. Simulations have been carried out for two different materials of compositing element (insert) and three different pouring temperatures with software NovaFlow&Solid 2.9 r81. Findings: Obtaining good quality and with desirable thickness composite layer depends on process and level of heating during casting process. Research limitations/implications: Researches made possible to determination which technological parameters directly influent on this process and how criterions should be meet by casting technology of this kind of casting. Originality/value: Obtained results and their experimental verification will make possibility to form a basis for work out guidelines and principles for design technology of casting with composite layer on choose surfaces productions.
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