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Simulation and optimization model of reservoir system in Svitava river basin
Šejnoha, Michal ; Marton, Daniel (referee) ; Menšík, Pavel (advisor)
The bachelor´s thesis is focused on the construction of a simulation and optimization model selected water management system. Both models are created with program SOMVS. The simulation model is based on the choice improved outflow from reservoir searching of boundaries Assurance classes. The simulation model simulates the flow of water through the system. Not finding the optimal solution using optimization methods. In the optimization model is used optimization method of differential evolution. The optimization model seeks maximized value of the objective function for water withdrawal from selected profile.
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Evaluation of the level motor skils children of younger school age with mental disability by the test battery MABC-2 in České Budějovice
ŠEJNOHA, Martin
The aim of the thesis was to evaluate the level of motor skills of younger school age children using a MABC-2 scoring in České Budějovice. Through a literature research using an analytic-synthetic method a theoretical basis focused on knowledge from the field of mental disabilities, motor skills and abilities and MABC-2 scoring was developed. As part of the research, 6 children with mental disabilities aged 7-10 years attending a special primary school in České Budějovice were tested using the MABC-2 scoring after the informed consent of the children's legal representatives. Based on the achieved results and their subsequent comparison with the standardized set MABC-2 for the Czech population, it was found that the average standard score is 7.2 lower than the average value of the standard for children of the same age. The smallest difference was recorded in the Aiming & Catching component, 4.84 points and the largest in the Manual Skill component, 6.5 of the standard score. The result shows that all tested children showed motor difficulties. At the same time, frequent deviations from the standard execution of individual actions were observed within the qualitative evaluation.
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Evaluation of effective properties of basalt textile reinforced ceramic matrix composites
Valentová, S. ; Hrbek, Vladimír ; Šejnoha, M.
The present paper is concerned with the analysis of a ceramic matrix composite, more specifically the plain weave textile fabric composite made of basalt fibers embedded into the pyrolyzed polysiloxane matrix. Attention is paid to the determination of effective elastic properties of the yarn via homogenization based on the Mori-Tanaka averaging scheme and the 1st order numerical homogenization method adopting a suitable representative computational model. The latter approach is then employed to simulate the response of the yarn when loaded beyond the elastic limits. The required mechanical properties of individual material phases are directly measured using nanoindentation with in-build scanning probe microscopy. Applicability of the proposed computational methodology is supported by the analysis of a unidirectional fibrous composite, representing the yarn, subjected to a macroscopically uniform strain
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Using homogenization and nanoindentation for microfibril angle determination of spruce
Kucíková, L. ; Hrbek, Vladimír ; Vorel, J. ; Šejnoha, M.
This paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further supported by the present study that the microfibril angle has a great influence on the final mechanical properties of wood. This angle could be measured either directly using, e.g. polarisation microscopy, X-ray diffraction, infrared spectroscopy, or indirectly, as used in this study, by employing the nanoindentation measurements. Therein, the measured indentation modulus is compared with that obtained numerically using the anisotropic theory of indentation. The latter one depends on the entire stiffness matrix derived through homogenization and the searched microfibril angle. In view of the cell wall microstructure, the effective cell properties were found using the two-step micromechanical homogenization adopting both the Self-consistent and Mori-Tanaka methods.
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Strength of composite yarn under biaxial loading
Valentová, S. ; Hrbek, Vladimír ; Vorel, J. ; Šejnoha, M.
The present paper is concerned with two types of periodic unit cell of composite yarn with different geometry but the same material properties. Their macroscopic response under tensile and compressive loading in the transverse direction and their combination are plotted in the graphs. Based on stress-strain curves the failure envelopes are constructed. A simple maximum stress criterion and linear softening law is used in the adopted progressive damage analysis to outline the softening part of stress-strain diagrams. Finally the impact of selected representative volume element is observed through the comparison of results gained for both designed periodic unit cells in the microlevel, meaning the level of yarn.
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Simulation and optimization model of reservoir system in Svitava river basin
Šejnoha, Michal ; Marton, Daniel (referee) ; Menšík, Pavel (advisor)
The bachelor´s thesis is focused on the construction of a simulation and optimization model selected water management system. Both models are created with program SOMVS. The simulation model is based on the choice improved outflow from reservoir searching of boundaries Assurance classes. The simulation model simulates the flow of water through the system. Not finding the optimal solution using optimization methods. In the optimization model is used optimization method of differential evolution. The optimization model seeks maximized value of the objective function for water withdrawal from selected profile.
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