Browsing by Subject "modelowanie komputerowe"

Now showing 1 - 14 of 14

Access status: Open Access ,
Computer modeling for the visualization and geometric reconstruction of artefacts from the casting workshop in Grzybiany
(2015) Garbacz-Klempka, Aldona; Rzadkosz, Stanisław; Stolarczyk, Tomasz; Kozana, Janusz; Piękoś, Marcin; Kwak, Zofia; Tenerowicz, Mieszko
The casting workshop in Grzybiany is one of the most important archaeological sites in regards to casting technology from the Bronze and Early Iron Ages. During the 'Grzybiany. Osada nadjeziorna z epoki brązu i żelaza' [Grzybiany. Lakeside settlement from the Bronze and Early Iron Ages] research, the structure of casting moulds was analyzed as well as the chemical composition and microstructure of one of the more-interesting metal artefacts found within the workshop. Based on this, geometric visualization was performed with the help of computer-modeling methods. For scientific, experimental, and educational purposes, reconstruction of a zoomorphic pendant was performed using the lost-wax method. Wax models injected into a matrix were used, along with fired ceramic (gypsum) moulds and a specially prepared modeling alloy that corresponds to the original material. In this way, a true replica of the original was obtained: technologically, structurally and chemically. Studies of production technology of the casting workshop dated back to the Bronze and Early Iron Age help to increase the knowledge of the mould-preparing technology and the alloys used. Modern tools and computer programs aid in the research of old technologies and help disseminate the results.
Access status: Open Access ,
Efektywne algorytmy automatycznej dyskretyzacji nietrywialnych trójwymiarowych form geometrycznych oraz ich obiektowa implementacja
(2004-06-24) (Data obrony: 2007) Jurczyk, Tomasz
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The task of the mesh generator is partitioning of the given geometric domain into a finite number of simple elements, conforming to requirements specified by user (e.g. type of elements, size, stretching or quality). The main contribution of this thesis is the development and optimization of an automated generator of unstructured anisotropic surface and volume meshes. The triangular meshes are created on parametric surfaces using a modified technique of incremental Delaunay triangulation. The anisotropic characteristic of mesh elements was obtained using non-Euclidean metric via the developed system of coordinate transformation. For three-dimensional problems, tetrahedral meshes can be generated using similar technique. The proposed improvements allow increasing the efficiency of discretization and enhancing the procedure of boundary constraining, which is one of the main problem of 3D Delaunay triangulation. Generation of meshes (both two- and three-dimensional) is realized using a special control space structure, responsible for delivery of a desired size and shape of mesh elements in any point of the discretized domain. There is presented an automated schema of discrete control space creation, taking into account a number of metric sources gathered automatically or obtained from the user. There are also presented numerous examples and experimental analysis of the computational and memory complexity of the subsequent phases of mesh generation and transformation.
Access status: Open Access ,
Extended free surface flow model based on the lattice Boltzmann approach
(2010) Szucki, Michał; Suchy, Józef Szczepan; Żak, Paweł; Lelito, Janusz; Gracz, Beata
The aim of this work was to extend numerical model of mould filling phenomena previously presented in [3]. Authors described some techniques for modeling single phase and free surface flows. Method, called 'piston model', for modeling influence of liquid flow on gas behavior inside the mould and also, effect of local gas pressure on movement of metal free surface, was shown. In last part of this work, results from presented model were compared with data from the commercial simulation environment FLOW-3D.
Access status: Restricted ,
Planowane!
Informatyczne modele wzrostu w wybranych zagadnieniach geologii
(Data obrony: 2005) Topa, Paweł
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
W pracy przedstawione zostały praktyczne przykłady wykorzystania koncepcji prostego automatu (jak automat komórkowy lub L-system) w zagadnieniach modelowania problemów z różnych obszarów geologii. Opracowane zostały modele informatyczne - modele dla dwóch zjawisk: 1. Model rozwoju rzecznej sieci anastomozującej, wykorzystujący paradygmat automatu komórkowego. Rzeką anastomozujacą nazywamy system rzeczny tworzący sieć łączących się i rozdzielających kanałów. Tego typu systemy rozwijają się na płaskich nizinnych obszarach, a głównym czynnikiem warunkującym ich powstawanie jest wegetacja roślin torfotwórczych. Podstawę dla przedstawionych we wniosku modeli rozwoju rzeki anastomizującej stanowi prosty automat komórkowy modelujący przepływ wody w terenie. W modelu, nazwanym SCAMAN (Simple Cellular Automata Model of Anastomosing Network), automat komórkowy został uzupełniony o reguły symulujące rozprzestrzenianie się środków odżywczych na terenach wokół koryt oraz reguły wzrostu torfowiska. Zjawisko rzeki anastomozującej łączy zachodzące w różnych skalach przestrzenno-czasowych, których przedstawienie w modelu SCAMAN jest trudne i wymaga zwiększenia nakładów pamięciowych i obliczeniowych. Aby przezwyciężyć ten problem, wprowadzono nowe narzędzie modelowania będące kombinacją grafu i klasycznego automatu komórkowego. Nowe narzędzie zostało wykorzystane w modelu MANGraCA (Model of Anastomosing Network Graph of Cellular Automata). 2. Model wzrostu skorupki otwornicy, wykorzystujący kombinację koncepcji ruchomego układu odniesienia i lokalnej minimalizacji. Otwornice (łac. foraminifera) są organizmami jednokomórkowymi budującymi mineralne skorupiaki o niezwykłym bogactwie form. Komputerowy model wzrostu skorupki otwornicy stanowi nieocenioną pomoc podczas klasyfikacji, wykazując wpływ różnych parametrów na kształt skorupki. Opracowany model stanowi całkowite nowatorskie rozwiązanie w tej dziedzinie. Dotychczasowe modele podczas generowania formy używały globalnego układu odniesienia i nie doceniały znaczenia ujścia muszli. Przyjęcie założenia o lokalnym ruchomym układzie odniesienia oraz wprowadzenie optymalizacji podczas kształtowania skorupki pozwoliło rozwiązać cały szereg problemów, które pozostawały poza możliwościami poprzednich modeli.
Access status: Restricted ,
Komputerowe modelowanie wpływu rozwiązań zielonej infrastruktury na gospodarkę wodami deszczowymi dla wybranego obszaru.
(Data obrony: 2019-07-12) Markowski, Michał
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Model krystalizacji w układzie dwuskładnikowym z udziałem trzech faz z wykorzystaniem automatu komórkowego
(2006-11-13) (Data obrony: 2011) Gurgul, Daniel
Wydział Odlewnictwa
In the first part of thesis an overview of modeling of cast iron solidification is presented. It is a short historical re-view, starting with analytical models and ending with fully numerical. The characteristics of individual models are briefly described. Chapter "Model description" presents a detailed description of the model of ductile iron solidification. It is based on cellular automaton technique. Its characteristic feature is that the shape of growing austenite and graphite grains is not supposed a priori, but is the result of model calculations. The model takes into account such phenomena as heat transfer, diffusion of carbon in liquid and austenite, release of latent heat and its impact on the conditions prevailing at the front of solidification, nucleation of austenite and graphite. The model takes into consideration nonequilibrium nature of phase transformations and the effect of curvature of the interphase boundaries on the temperature of thermodynamic equilibrium. In the experimental part simulations of ductile iron solidification were performed for hypoeutectic, eutectic and hypereutectic composition. The modeling results were compared with experimental results which were obtained for ductile iron with hypoeutectic composition and for so called transparent model substance. The modeling cooling curve was compared with the real cooling curve. In order to qualitatively comparison of calculated microstructures they were compare with real microstructures of the experimental castings.
Access status: Open Access ,
Modelling of lightning overvoltages for the protection of transmission lines by means of shielding wires and surge arresters
(Data obrony: 2009) Dau, Saad Khalifa Omar
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The content of doctoral dissertation are the problems of the modelling of overvoltages which are generated in the overhead transmission lines during lightning strokes. High voltage transmission lines are protected from direct lightning strokes by the use of shielding wires. In order to reduce overvoltages in the overhead lines surge arresters are also applied. In the dissertation was confirmed that the computer simulations of lightning overvoltages can be performed only with the use of selected mathematical models of lines, surge arresters and different devices as well as phenomena existing in conditions of generation of overvoltages. On the basis of analysis were selected detailed models appropriate for conditions of propagation of overvoltage waves with large steepness. The computer simulations of lightning overvoltages have been performed in the part of electric power system. On the basis of the results of the work, it was confirmed that values of the lightning surges are dependent on parameters of lightning currents, the construction of the lines and parameters of surge arresters. The protection systems containing both shielding wires and surge arresters create complex overvoltages protection of overhead lines.
Access status: Restricted ,
Modelowanie procesu łączenia wiązką elektronów kutych elementów wielkogabarytowych dla przemysłu energetycznego
(Data obrony: 2019-10-24) Franczyk, Albert
Wydział Inżynierii Metali i Informatyki Przemysłowej
Access status: Restricted ,
Modelowanie własności mechanicznych materiałów zastawek serca
(Data obrony: 2020-05-18) Świergała, Karolina
Wydział Inżynierii Metali i Informatyki Przemysłowej
Access status: Open Access ,
Modelowanie wpływu zaburzeń tektonicznych na drgania stropu w górotworze uwarstwionym
(Wydawnictwa AGH, 2008) Walaszczyk, Jan; Wiewiórka, Dariusz
Phenomenon of dynamic relieving present in paper and methodic of numerical modeling this problem. Numerical model of group of room present in interaction area of big fault. Diagrams in result of account received displacement, velocities and acceleration in chosen points of models. It implement analysis about diagrams of changes of tensions in pillars and enclosing of them. Numeric errors in digital filtration of result use eliminating.
Access status: Open Access ,
Petrofizyczne uwarunkowania ropo-gazonośności utworów dewonu i karbonu w południowej części niecki miechowskiej w świetle wyników modelowań komputerowych
(Wydawnictwa AGH, 2007) Papiernik, Bartosz; Łapinkiewicz, Artur; Górecki, Wojciech
As a result of hydrocarbon exploration in the Palaeozoic formations of the Upper Silesian and Małopolska blocks covered by the Miocene deposits of the Carpathian Foredeep, commercial hydrocarbon accumulations have been discovered in Devonian rocks (Lachowice, Stryszawa, Zalesie, and Niwiska) and in Carboniferous rocks (Nosówka near Rzeszów, Marklowice). In the Miechów Trough, hydrocarbon shows in the Palaeozoic section are scarce, probably due to lacking Miocene seal. The paper presents results of spatial variability modelling of the lithofacies and reservoir parameters in the Devonian and Carboniferous deposits and in their direct cover, i.e. Triassic and Jurassic rocks. The 3D computer model for the area Proszowice - Busko - Pińczów (1200 km$^2$) was constructed on the basis of seismic and laboratory data and results of geophysical well logging. The obtained results indicate that the Devonian and Carboniferous carbonate deposits which predominate in the basement of the southern Miechów Trough represent poor reservoir rocks. However, it is the lack of good-quality regional seal that has essentially interfered with formation of »Palaeozoic« accumulations.
Access status: Restricted ,
Projekt systemu mieszania do wytwarzania stabilnych emulsji wodno-olejowych z wykorzystaniem modelowania komputerowego i druku 3D
(Data obrony: 2020-01-17) Zoła, Łukasz
Wydział Wiertnictwa, Nafty i Gazu
Access status: Open Access ,
Wpływ rozdrobnienia struktury na mechanizmy umocnienia stali niskowęglowych odkształcanych plastycznie
(2004-12-13) (Data obrony: 2008) Muszka, Krzysztof
Wydział Inżynierii Metali i Informatyki Przemysłowej
An effect of grain refinement on the basic strengthening mechanisms of metallic materials after plastic deformation was discussed. Grain refinement levels, where the change in the deformation mechanisms is observed, have been identified with respect to resulting changes in the strengthening mechanisms of studied materials. Differences in the description of deformation and strengthening mechanisms of ultrafine-grained (UFG) and nanocrystalline materials were defined. Also, the existing flow stress models for UFG materials were presented and their physical bases were discussed with respect to their application in the computer modeling process of mechanical behavior of UFG low carbon steels. In the experimental part the UFG structures were produced in the low carbon and microalloyed steels by the means of controlled rolling and using severe plastic deformation process (MaxStrain simulator). The detailed analysis of the effect of particular processing parameters on the obtained refinement level and final mechanical properties has been performed. Utilizing results from theoretical analysis and experimental work, the verification process of chosen existing flow stress models of UFG and nanostructured materials was performed using Abaqus Explicit. Then, basing on the experimental results the modification of the KHL model has been proposed treating separately the contribution of low- and high angle grain boundaries. Effectiveness of the modified version of the KHL model was examined using experimental results.
Access status: Open Access ,
Zastosowanie metody konwekcji zmiennej wewnętrznej do modelowania zjawiska tiksotropii
(2004-03-29) (Data obrony: 2008) Macioł, Piotr
Wydział Inżynierii Metali i Informatyki Przemysłowej
In this PhD thesis, an Internal Variable Convection (IVC) method for thixotropy modelling is proposed. It is based on convection of "artificial species", which represents internal variable, and makes possible to simulate history dependent materials basing on Eulerian mesh. In the most of papers, materials for thixoforming are treated just as a fluid. IVC methodology has been verified with authors own numerical code - CompFlower. Its application is mainly numerical modelling of fluid flows, including IVC methodology. Additional task of this thesis is to develop numerical program based on CBS algorithm. CBS algorithm is one of the most advanced methods of CFD. Moreover, CompFlower software has been implemented in C++ language. C++ is still not very popular in numerical codes. This language is judged to be less efficient than structural ones, like FORTRAN or C. Thanks to developing of FEM software, based on C++, it will be possible to verify, is this language is efficient enough to be used in numerical codes. Moreover, developed software will be easier for maintain and expansion in future.