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Wyszukujesz frazę "Sobieski, S." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Selection strategy for milling parts on CNC Machines
Autorzy:
Zalewski, A.
Sobieski, S.
Powiązania:
https://bibliotekanauki.pl/articles/132158.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
CAM
CNC
simulation
strategy
Opis:
Practical knowledge and experience of engineers, CNC programmers, operators related to the implementation of production tasks in the workshop are essential. Every day, developed, perfected for companies specialty, “technological knowledge base “, is a specific, dedicated to the particular conditions of the key to success – the “know -how “in the concrete conditions of production. This knowledge can be relatively easily processed and developed, in particular with regard to the development of technology in the CAM. Additionally subjected to simulation analysis allows comparison of different strategies and variations of part in the design of technology. Several years of authors experience in the analysis of the work ‘s CAM systems in many companies has enabled the formulation of universal principles of numerical simulations that take into account the individual characteristics of the workpiece and the specificity of the selected CNC machine with accessories. Conducted research on the production based on Catia V5 program and Mastercam X6 confirmed the validity of this approach and helped to correcting some of the assumptions developed algorithm.
Źródło:
Advanced Technologies in Mechanics; 2015, 2, no. 2 (3); 9-23
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of the relations between porosity and tortuosity in granular beds
Autorzy:
Sobieski, W.
Lipiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/950448.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
porous media
granular beds
porosity
tortuosity
Opis:
In the paper, functions describing different porosity-tortuosity relations were collected, and then the tortuosity values were calculated for a one granular bed consisting of spherical particles with normal distribution of diameters. Information about the bed porosity and particle sizes was obtained from measurements conducted for an artificial granular bed, consisting of glass marbles. The results of calculations were compared with the results of two other methods of tortuosity determination, performed for the same case (details are not described in this paper): the first of them uses the Path Tracking Method, the second one - information about the velocity components in a creeping flow (the Lattice-Boltzmann Method was applied to obtain the velocity field in the flow). The main aim of our article was to test whether the functions linking tortuosity with porosity, which are available in the literature, give similar results as the methods described above. To achieve this aim, the relative errors between results of calculations for the collected formulas and values from the both previous mentioned methods were calculated.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(1); 75-85
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of porous beds based on fractal parameters
Autorzy:
Bramowicz, M.
Kulesza, S.
Sobieski, W.
Powiązania:
https://bibliotekanauki.pl/articles/298066.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
granular beds
porosity
fractal analysis
numerical modeling
Opis:
The paper presents the results of a fractal analysis of the cross-sections of a porous mineral deposit consisting of spherical elements which formed a spatial system with varying porosity (0.4 to 0.95). The virtual deposit was generated using the Discrete Element Method in the YADE code by means of the so-called Radius Expansion Method. The fractal analysis was carried out using the structure function method, determining the fractal dimension (D), the topothesy (L) and the corner frequency (l) (MAINSAH et al. 2001). The conducted simulations have confirmed to a considerable extent the test results available in the literature involving the fractal analysis of mineral deposits with varying porosity. They clearly indicate that the fractal dimension does not change along with the porosity of the deposit, if the autocorrelation function or their transformations (e.g. structure function) methods are used. Moreover, based on the information available in the literature, it can be concluded that the value of the fractal dimension corresponds to mineral deposits with the specified geometric shapes of the elements which form them.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(2); 171-179
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach for obtaining the geometric properties of a granular porous bed based on DEM simulations
Autorzy:
Sobieski, W.
Dudda, W.
Lipiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/297977.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
granular beds
spatial structure
Discrete Element Method
PathFinder code
Opis:
In the article, a new way for obtaining a set of geometrical parameters of granular porous beds is presented, if the data on the locations and sizes of all particles is available. The input data were prepared with the use of Discrete Element Method. The other way for acquiring the input data may be the application of Computed Tomography (CT) and Image Analysis (IA) techniques. All geometrical parameters are calculated with the use of own numerical code called PathFinder (freely available in the Internet together with its source code). In addition to description of the method of calculations, two examples of its use are presented. One simulation was performed in PFC3D code, and the other in YADE software. The aim of the article was to show clearly that a porosity is not sufficient to describe the spatial structure of a porous body. In both presented examples, the porosity value is almost the same, but other parameters, e.g. tortuosity, are different. The motivation to write the PathFinder code were significant problems with obtaining geometrical parameters needed in investigations related to granular porous media. The issues described in the article are a part of an overall research methodology relating to the linking the micro- and macro-scale investigations of granular porous beds. The areas of applications of this methodology are not discussed in the article.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 165-187
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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