Autor: Beneš, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Anisotropic Phase Field Model of Heteroepitaxial Growth
Autorzy:: Hoang, Dieu
Beneš, M.
Stráský, J.
Powiązania:: https://bibliotekanauki.pl/articles/1402067.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.10.Aj
05.70.Ln
81.40.Jj
81.30.Fb
Opis:: We study the heteroepitaxial growth of thin layers by means of the modified phase-field model with the incorporated anisotropy. The influence of elastic and surface energies on the layer growth is considered. For numerical solution of the model, an explicit numerical scheme based on the finite element method is employed. The obtained computational results with various anisotropy settings demonstrate the anisotropic thin-layer pattern growth.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 520-522
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical Simulation of Dislocation Cross-Slip with Annihilation in Non-Symmetric Configuration
Autorzy:: Pauš, P.
Beneš, M.
Kratochvíl, J.
Powiązania:: https://bibliotekanauki.pl/articles/1402142.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.70.Bf
61.72.Lk
02.30.Jr
Opis:: The interpretation of the experimentally determined critical distance of the screw dislocation annihilation in persistent slip bands is still an open question. We attempt to analyze this problem using the discrete dislocation dynamics simulations. Dislocations are represented by parametrically described curves. The model is based on the numerical solution of the dislocation motion law belonging to the class of curvature driven curve dynamics. We focus on the simulation of the cross-slip of one edge dislocation curve bowing out of the wall of a persistent slip band channel and one screw dislocation gliding through the channel. The dislocations move under their mutual interaction, the line tension and the applied stress. A cross-slip leads to annihilation of the dipolar parts. In the changed topology each dislocation evolves in two slip planes and the plane where cross-slip occurred. The goal of our work is to develop and test suitable mathematical and physical model of the situation. The results are subject to comparison with symmetric configuration of two screw dislocations studied in papers by Pauš et al. The simulation of the dislocation evolution and merging is performed by the improved parametric approach. Numerical stability is enhanced by the tangential redistribution of the discretization points.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 737-739
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Simulation of Dislocation Annihilation by Cross-Slip
Autorzy:: Pauš, P.
Beneš, M.
Kratochvíl, J.
Powiązania:: https://bibliotekanauki.pl/articles/1418510.pdf
Data publikacji:: 2012-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.70.Bf
61.72.Lk
02.30.Jr
Opis:: This contribution deals with the numerical simulation of dislocation dynamics, their interaction, merging and changes in the dislocation topology. The glide dislocations are represented by parametrically described curves moving in slip planes. The simulation model is based on the numerical solution of the dislocation motion law belonging to the class of curvature driven curve dynamics. We focus on the simulation of the cross-slip of two dislocation curves where each curve evolves in a different slip plane. The dislocations evolve, under their mutual interaction and under some external force, towards each other and at a certain time their evolution continues outside slip planes. During this evolution the dislocations merge by the cross-slip occurs. As a result, there will be two dislocations evolving in three planes, two planes, and one plane where cross-slip occurred. The goal of our work is to simulate the motion of the dislocations and to determine the conditions under which the cross-slip occurs. The simulation of the dislocation evolution and merging is performed by improved parametric approach and numerical stability is enhanced by the tangential redistribution of the discretization points.
Źródło:: Acta Physica Polonica A; 2012, 122, 3; 509-511
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Heat flow through a thin cooled pipe filled with a micropolar fluid
Autorzy:: Beneš, M.
Pažanin, I.
Suárez-Grau, F. J.
Powiązania:: https://bibliotekanauki.pl/articles/279970.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: pipe flow
heat conduction
micropolar fluid
asymptotic analysis
Opis:: In this paper, a non-isothermal flow of a micropolar fluid in a thin pipe with circular cross- -section is considered. The fluid in the pipe is cooled by the exterior medium and the heat exchange on the lateral part of the boundary is described by Newton’s cooling condition. Assuming that the hydrodynamic part of the system is provided, we seek for the micropolar effects on the heat flow using the standard perturbation technique. Different asymptotic models are deduced depending on the magnitude of the Reynolds number with respect to the pipe thickness. The critical case is identified and the explicit approximation for the fluid temperature is built improving the known result for the classical Newtonian flow as well. The obtained results are illustrated by some numerical simulations.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 569-579
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical Simulations of Glide Dislocations in Persistent Slip Band
Autorzy:: Kolář, M.
Beneš, M.
Kratochvíl, J.
Pauš, P.
Powiązania:: https://bibliotekanauki.pl/articles/1402064.pdf
Data publikacji:: 2015-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.70.Bf
61.72.Lk
02.30.Jr
Opis:: For the purpose of estimation of possible inaccuracy in standard discrete dislocation dynamics simulations, we study the motion of interacting dislocations in two regimes: the standard stress control and the total strain control. For demonstration of the difference, we consider two dislocations of opposite signs, gliding in parallel slip planes in a channel of a persistent slip band. Exposed to the applied stress, the dislocations move, bow out, and form a dipole. We investigate the passing stress needed for the dislocations to escape each from other, considering the stress controlled regime and the total strain controlled regime. The motion is described by the mean curvature flow and treated by means of the direct (parametric) method. The results of numerical experiments indicate that the stress control and the total strain control provide upper and lower estimate of the passing stress, respectively, and that these two estimates differ by approximately 10%.
Źródło:: Acta Physica Polonica A; 2015, 128, 4; 506-509
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Influence of Burner Locations in the Heating Furnace on the Charge Temperature Field
Wpływ usytuowania palników w piecu grzewczym na pole temperatury nagrzewanego wsadu do przeróbki plastycznej
Autorzy:: Rywotycki, M.
Szajding, A.
Malinowski, Z.
Telejko, T.
Gołdasz, A.
Beneš, M.
Powiązania:: https://bibliotekanauki.pl/articles/351620.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: industrial furnaces
heat transfer
numerical modelling
piece przemysłowe
przenikanie ciepła
modelowanie numeryczne
Opis:: Charge heating in industrial furnaces is a difficult and complex process. There are many physical phenomena which influence heat transfer. At the charge surface heat transfer takes place by radiation and convection. In order to ensure correct operation of the technological system, it is necessary to achieve the required charge temperature in the whole volume and ensure its uniformity. The influence of selected burner locations inside the furnace on the charge temperature has been analysed. The temperature field and its uniformity in the round charge made of steel for hot open die forging have been analysed. The model and numerical calculations were performed with the ANSYS-Fluent 14.5 package.
Nagrzewanie wsadu w piecach przemysłowych jest trudnym i złożonym procesem. Celem zapewnienia prawidłowej pracy ciągu technologicznego konieczne jest osiągnięcie przez wsad wymaganej temperatury w całej objętości, oraz zapewnienie odpowiedniej równomierności nagrzewania. W pracy określono wpływ sposobu nagrzewania wsadu w piecu komorowym dla wybranych wariantów usytuowania palników grzewczych. Analizie poddano pole temperatury i jego jednorodność w nagrzewanym wsadzie stalowym przeznaczonym do przeróbki plastycznej. Model i obliczenia wykonano pakietem numerycznym ANSYS-Fluent 14.5.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 3A; 1981-1985
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optimized re-entry input shapers
Autorzy:: Beneš, P.
Valášek, M.
Powiązania:: https://bibliotekanauki.pl/articles/281198.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: input shaper
command shaper
residual vibrations
re-entry
Opis:: The paper deals with the design of optimized input shapers for non-vibrational control of flexible mechatronic systems. The described method is based on a combination of advantages from two approaches – precomputed control curves and on-line shapers. The strategy has two steps. Primarily, an optimized precomputed curve is found as a solution to the point-to-point control problem with respect to any requested optimization goals. Then it is transformed into an on-line shaper with the re-entry property. The resulting shaper transforms any arbitrary input signal to a non-vibrational one. In contrast to other techniques, the shaper length is not determined from the system natural frequency. The shaper can be easily modified with respect to position, velocity, acceleration or jerk control. The theoretical results are verified by experiments using a laboratory crane.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 353-368
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Measurement and Calibration of Machine Tools in 6 DOFs in Large Workspace
Autorzy:: Benes, P.
Valasek, M.
Sveda, J.
Powiązania:: https://bibliotekanauki.pl/articles/971210.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: measurement
calibration
machine tool
6 DOFs
workspace
Opis:: The measurement and calibration of machine tools in the large workspace (for example 10x20x3m) and in all 6 DOFs (3 cartesian translations and 3 rotations) is not an easy task. A new device called RedCaM (Redundant Calibration and Measurement Machine) has been developed that enables simultaneously to measure all 6 DOFs in the workspace. The RedCaM machine was designed with redundant number of sensors and therefore as a parallel kinematical structure. Thus it profits from the fact that the sensor errors are not chaining. It is equipped only with the sensors and it is operated by the drives of the measured machine tool after the attachment of the platform into the machine tool spindle. The redundancy of sensors provides better accuracy, self-calibration property and very good ratio between the errors of particular sensors and the resulting error of the end effector position. This has been optimized and has proven the improved (minimized) transfer of the errors between the sensors and the position in space in 6 DOFs. In particular the used redundancy of sensors (9 sensors for 6 DOFs) enables the self-calibration (all kinematical parameters are calibrated during the first motions in the workspace) and the minimized transfer of errors between the sensors and the 6 DOFs of the platform that has been experimentally proven to be 1:1. The paper deals with the description of the modification of RedCaM for the usage in the large workspace of machine tools that are in principle unlimited.
Źródło:: Journal of Machine Engineering; 2009, 9, 3; 77-87
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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