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Optimalizace parametrů úlohy s rázovým zatížením v programu LS-DYNA
ŠTANGL, Jiří
Master's thesis focuses on numerical modeling of automotive tasks. The text is divided into two main parts. A fuel supply module is the main topic of all numeric analyses of this thesis and it is introduced in the first part. Basics of theoretical continuum mechanics and finite elements method are also explained in the first part. The second part is split into two main topics of the fuel supply module - material damping and contact numerical modeling. Practical reasons for parameter optimization are explained along with particular optimization results and underlying theoretical background.
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Service-oriented simulation architecture
Polášek, Petr ; Sklenář, Jaroslav (referee) ; Kavička,, Antonín (referee) ; Češka, Milan (advisor)
This thesis focuses on design, modeling and simulation of heterogeneous systems with emphasis on discrete-event systems. It proposes service-oriented simulation architecture where modeling and simulation is treated as a service and establishes a DEVS Meta Language that is intended for implementation of simulation models based on the DEVS formalism. Special M\&S techniques are described and integration of existing simulation tools is discussed as well.
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Modelling Scenarios of Development of Small Agriculture Businesses
Koláčková, Gabriela ; Tichá, Ivana (advisor) ; Stanislava, Stanislava (referee)
The paper deals with the dynamic simulation of possible development scenarios of small farmers. The model is based on the official data sources but also on the qualitative research of small farmers. The modelling structure reflects the specifics of the examined field and personal and social specifics of small farmers. For the purposes of the analysis, the business model describes the value creation in the small farms, thereafter the model is extended into dynamic simulation model and the selected scenarios of development are simulated.
The analysis shows the impact of the current setup in the field. Despite the paper contains the optimistic scenarios, simple change of parameters leads to unsustainable situation. The pessimistic scenarios grow from realistic conditions when parameters reflects the recent period settings. This clearly depicts the influence of weak market position of the farmers and advocates the diversification tendencies.
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Contribution to the evaluation of different approaches to the modelling of soil loss by water erosion in GIS
Hrabalíková, Michaela ; Janeček, Miloslav (advisor) ; Jan, Jan (referee)
Dissertation thesis: Contribution to the evaluation of different approaches to the modelling of soil loss by water erosion in GIS, is a set of five studies published or accepted for publication in scientific journals. Thematically the work deals with the question of linking the erosion modelling together with geographic information systems. The work is divided into five chapters. In the first chapter, the issue of erosion and rainfall-runoff modelling is described. A particular focus is placed on the concept and the basic equations underlying erosion modelling. The second chapter contains 2 studies that deal with modelling rainfall-runoff conditions in the area of experimental area using KINFIL model. The chapter also discusses the selection of a suitable model and source datasets that forms the basis for the evaluation of physiographic parameters of a catchment. The third chapter is thematically focused in calculating the rainfall factor based on long-term precipitation records from 32 meteorological stations in the Czech Republic. It partially overlaps with the previous chapter because one of the outcomes of the study is the REDES database containing values of R-factor. However, the chapter focuses more on the time scale, and especially the influence of the time step in the simulation on resulting outcomes of the model. The fourth chapter is dealing by erosion modelling in GIS based on analysis of digital terrain models. It contains a study that addresses the influence of various algorithms and/or equations to calculate topographical factor and its effect on the overall prediction of soil loss.
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Rheological characteristics of untreated and thermally modified wood under long-term loading in bending
Berková, Tereza ; Borůvka, Vlastimil (advisor) ; Ruman, Daniel (referee)
Heat-treatment belongs to the most ecological methods of wood preservation methods and increase of its natural stability in exposition to outdoor conditions. Research of mechanical properties opens new possibilities of thermowood usage in general.
Wood appertains to viscoelastic materials and due to long-term loading creeps. There currently rise both elastic deformation, deformation elastic in time and plastic deformation. Partially there are irreversible changes due to stress even after unloading.
This work presents first insight to the matters of thermowood rheology and inspects its behavior under long-term loading in bending. This paper compares ratio of these three types of deformation in untreated wood and thermally modified wood in seven different temperatures (140; 160; 180; 190; 200, 210°C). The samples were exposed to 600 hours applied loading covering 40% of ultimate stress (modulus of rapture). Test were performed under constant conditions in special creep units in conditioning kiln. Increasing deformation under constant load was analyzed by Burger rheological model.
The results show that samples treated under lower temperatures (140 and 160°C) exhibit greater creep than untreated wood. This result is positive for structural usage of wood. On the other hand the samples treated under higher temperatures levels (200 an 210°C) display deterioration of mechanical properties. This is due to changes in wood structures caused by heat-treatment.
The most important impact of this work goes to future research of this field. Next development has to apply for the best quality of samples and also select rather prismatic parallelism than transversal one. Also application of 40% ultimate stress loading appeared as too high and together with wood defects led to destruction of samples.
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Multi-Conductor Model of Communication over Outdoor Power Lines
Franek, Lešek ; Steinbauer, Miloslav (referee) ; Vozňák, Miroslav (referee) ; Fiedler, Petr (advisor)
PLC - power line communication is not new. It has been known for many years. But It never be used in massive scale. There were only sporadic applications, for example ripple control system HDO used in the Czechoslovakia. PLC currently experiencing a renaissance thanks to the advent of Smart Grid. PLC offering relatively low bit rates and relatively unreliable transmission, but these disadvantages compensates very low costs to build a communication infrastructure and it offers specific functionalities for Smart Grid. The question is whether the declared parameters will be met in the real world. This thesis tries to find an answer.
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Static analysis of sports hall
Jedlička, Michal ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
This Bachelor´s thesis is about the static analysis of sports hall in Libina. I have used a program RFEM for making the model. The model was elaborated according to the provided project documentation and valid regulations ČSN EN. The aim of this work is to analyze the real construction and to point out to the formation of possible problems.
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NIOS II Processor Model
Masařík, Marek ; Dolíhal, Luděk (referee) ; Zachariášová, Marcela (advisor)
This bachelor thesis deals with the implementations of Nios II processor model in the description language processor called description CodAL. The implementation of processor is on two levels of abstraction. First level of abstraction is the instruction accurate model and second is the cycle accurate model. An important part of processor design is testing and verification which were realized on the prepared benchmark set. The resulting processor can be potentially used in real applications.
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Sketchup Woodworking Plugin
Matěj, Aleš ; Bidlo, Michal (referee) ; Vašíček, Zdeněk (advisor)
Main goals of this work are to understand the SketchUp application, learn the basic tasks of fiberboard furniture design and the design and implementation of tools, which should increase efficacy of these tasks. Tools are created as plug-ins for SketchUp using its Ruby API. The text it self is focused on fundamentals of 3D computer graphics and use of them in SkechtUp, fiberboard furniture design processes and the woodworking plug-in it self. Described tools are used for creation of board models, their management through user interface and generation of edging for boards.
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