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Acoustic emission sources from fast dislocation motion
Hora, Petr ; Machová, Anna ; Červ, Jan ; Uhnáková, Alena
Acoustic emission from the fast dislocations emitted from an edge crack in 3D bcc iron crystal is studied via atomistic simulations by molecular dynamics technique. Acoustic emission patterns arising from the fast dislocation motion in molecular dynamics are visualized via the local kinetic energies of individual atoms and further modeled as a moving source of the stress waves in the anisotropic continuum.
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Root-finding methods for solving dispersion equations
Hora, Petr
Contribution deals with the methods of rootfinding in a plate and cylindrical waveguide. The methods are based on: classic root-finding, interval arithmetics, Chebyshev interpolation, marching squares and marching triangles. All methods have been implemented both in Matlab (ChebFun toolbox) and Julia (ApproxFun module).
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Possibility of Increasing the Share of fast-growing trees in the Local Energy selected Municipalities
Pátková, Michaela ; Syrovátka, Oldřich (advisor) ; Hora, Petr (referee)
The work on "Options increase the share of fast-growing tree species in selected local energy community" to deal with the question of under what conditions it would be possible to increase the share of fast-growing wood (RRD) in the local community energy Stržanov. In the theoretical part summarizes the particular information about renewable energy and the cultivation of fast growing trees, she is also the issue of ecological stability of the landscape to which RRD production contributes to the business plan. Investigation of the village Stržanov focused primarily on the present structure of resources, fuel and attitudes of the population towards the possible introduction offers fast growing trees grown on agricultural land. The practical part is the calculation of the area of SRC plantations to supply the village Stržanov and their impact on the value of the coefficient of ecological stability (KES).
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Visualization of technical and business metadata
Beránek, Lukáš ; Pour, Jan (advisor) ; Hora, Peter (referee)
This master's degree thesis focuses on the issues of visualization formerly preprocessed business and technical metadata in a business environment. Within the process of elabora-tion and usage of the collected data in the company, it is necessary to present the data to the users in a comfortable, comprehensible and clear way. The first goal of this thesis is to describe and to specify the term of metadata in the field of theory and on the level of busi-ness, their main structure, their occurrence in a non-visual manner and related places where we can find metadata in the heterogeneous business environment. This part also includes a short introduction to the usage of metadata that is related and originates from business in-telligence and a description of Company encyclopedia that can syndicate these resources for further utilization. When defined, the sources, destinations and purpose of technical and business metadata can be used in the second part of the thesis -- this part is aimed at model-ing the use cases for the visual component that can be applied to business and technical metadata. Use cases will be focused on the roles of the users that will use this component and to discover the primary demands and requirements of these users and the functionality that will be indispensable. After the use cases are defined we can process to the next stage of visual component development -- the data must be visualized itself and we have to find proper means to achieve this with user experience being the main focus. Then we have to encapsulate the visualization with a graphical user interface that will meet the requirements and demands of the users' roles specified by the use cases section by prototyping. Lastly, the results of the previous chapters are used to prototype the visual component suitable for a web environment which is based on principles of reusability, data-driven approach, and uses modern web technologies such as framework and library D3.js, HTML5, CSS3, and SVG.
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FEM simulation of an integrated longitudinal and tangential wave probe
Hora, Petr ; Červená, Olga
The aim of contribution is the finite element modeling of integrated longitudinal and shear wave probe. This type of probe was investigated by Cheng-Kuei Jen and Makiko Kobayashi in Jen (2007). Finite element calculations are performed in the commercial environment COMSOL Multiphysics. The ultrasonic transducer excitation was modeled as total force load. The received ultrasonic signal was obtained by integration of velocities at place of ultrasonic transducer. Though these simplifications the resulting ultrasonic signals are in good agreement with results presented by Cheng-Kuei Jen and Makiko Kobayashi.
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Comparison of Simulation Software and Areas of Its Application
Hora, Pavel ; Kuncová, Martina (advisor) ; Dlouhý, Martin (referee)
This diploma thesis deals with computer simulation. In the opening, there are descriptions of theoretical aspect of computer simulation, simulation model structure and individual phases of simulation process. After that follow areas of application, characteristic features of each area and classification of simulation models, that are used in those areas. In this thesis only 4 areas of application were chosen: automotive industry, logistics and transportation systems, healthcare and military simulation. Each application area contains descriptions of a few chosen simulation software products that are used in this area. At the close there is a price comparison of described simulation products, their usage in Czech Republic and their development evaluation.
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The derivation of dispersion relations for anisotropic thick plates in system Maple
Červená, Olga ; Hora, Petr
The dispersion relations for cubic and orthotropic thick plates, which were derived in system MAPLE, are summarized in the report. The report contains listings of two programs in Maple. The form of Christoffel equation, forms of its roots and polarizations of partial waves for cubic and orthotropic thick plates are derived in first of them. The forms of dispersion relations of symmetric, anti-symmetric, SH-modes and Mindlin’s uncoupled modes for cubic and orthotropic plates are derived in second program. The report is deal with interpretation of the false roots, which are occurred at computing the dispersion relations. The outcome dispersion curves computing by MATLAB are displayed in the conclusion.
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Vliv Mindlinových okrajových podmínek na šíření vln v tlusté anizotropní desce
Červená, Olga ; Hora, Petr
This paper deals with analytical formulation of dispersion curves for stress waves in a free (001)-cut cubic and orthotropic plate. The direction of wave propagation is arbitrary. The dispersion curves for Cu and carbon reinforced composite are presented. These results are compared to the uncoupled Mindlin modes. This work is very important for determination of the elastic coefficients of anisotropic materials.
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