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Numerical Modelling of Weir Overflow
Šilhánková, Lenka ; Roth, Tomáš (referee) ; Jandora, Jan (advisor)
This thesis deals with the numerical modeling of water overflow over the front spillway. The aim of the thesis is to calculate various types of turbulent models and to assess the overflow coefficient on a sharp front spillway. The model was created in free software SketchUp, but the modeling itself was carried out in FLOW-3D software. The content of the work is a description of used software, design and calculation.
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Group Completeness Monitoring via Bluetooth
Hodulík, Hynek ; Šimek, Václav (referee) ; Vašíček, Zdeněk (advisor)
The aim of this thesis is to create smartphone application for Android operating system. This application will serve to create and then monitor a group of people during an activity like cycling or hiking. The main purpose of the application is to inform others when a member separates from the rest of the group. Devices communicate through Bluetooth Low Energy and form a network with mesh topology. The application is implemented in Java programming language.
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Polygonal Mesh Segmentation
Minařík, Vojtěch ; Havel, Jiří (referee) ; Španěl, Michal (advisor)
Bachelor's thesis deals with 3D model segmentation into particular meaningful segments. Method is based on algorithm described in article Protrusion-oriented 3D mesh segmentation The realized solution is based on assumption, that 3D models consist of a core and core attached protrusions. The segmentation algorithm consists of three main steps: core approximation, selection of salient points which indicate end of protrusion and assignment of points to appropriate segments. Implementation uses library CGAL which is useful for loading and manipulating 3D meshes.
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Calculation and optimization of synchronous servomotor reluctance torque.
Kroupa, Martin ; Hájek, Vítězslav (referee) ; Ondrůšek, Čestmír (advisor)
This work is mainly focused on construction and design simulation of synchronous servomotor. This motor is built by 30 permanent magnets which are attached to rotor and solved in Ansoft Maxwell 14 software. The main purpose was to calculate reluctance torque, which is significant during the motor operational mode and its optimization. Ansoft Maxwell 14 can analyze in 2D mode as well as in 3D mode, for analysis it uses method of finite elements. Subjects can be analyzed in static conditions, or in any way of transient movement. Optimization in 2D, where we will change the shape in the area of air gap, will only be used as revision that the reluctance torque is bounded with this factor. The main simulations were supposed to be done in 3D model, where the role of rotation should have been taken in account to the final result. These simulations were replaced by alternative calculation. On behalf of achieved results, the optional rotation is stated in the end of my work.
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Distributed Ray Tracing in Reasonable Time
Slovák, Radek ; Polok, Lukáš (referee) ; Herout, Adam (advisor)
This thesis deals with the method of distributed ray tracing focusing on optimalization of this method. The method uses simulation of some attributes of light by distributing rays of lights and it produces high quality and partly realistic images. The price for realitic effects is the high computational complexity of the method. The thesis analysis the theory connected with these aspects. A large part describes optimalizations of this method, i.e. searching for the nearest triangle intersection using kd-trees, quasi random sampling with faster convergence, the use of SSE instruction set and fast ray - triangle intersection. These optimalizations brought a noticable speed - up. The thesis includes description of implementation of these techniques. The implementation itself emphasises the practical usability including generating some advanced animations and universal description of objects.
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Intelligent Access Control System for Large Facilities
Truhlář, Jan ; Mrázek, Vojtěch (referee) ; Vašíček, Zdeněk (advisor)
Aim of this work is to create autonomous embedded device which allows access control with radio frequency identification (RFID). Device is configurable by web interface and offers access history. Updates of RFID cards database are realised by mesh network. For realisation of this work is used developement kit based on Espressif Systems ESP8266 chip, which is programmed with open-source platform Arduino. Created device can be used in locations without direct network covrage.
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Self-organizing MESH wireless networks
Němec, Petr ; Burget, Radim (referee) ; Růčka, Lukáš (advisor)
This master thesis deals with self organized Mesh network. It describes routing and particular routing protocols, which are used in these networks. The thesis deals with Mesh network QoS assurance. Analysis and theoretical background of Mesh networks, routing and router protocols are included in the first chapter. Basic models of assuring Quality of Service are also described. Those are Best Effort, IntServ and DiffServ. Second chapter describes the devices used in the specific Mesh network topology - Trospos 5210 MetroMesh router produced by Motorola Canopy. Basic settings and properties required to establish a Mesh network are described. Next part of the thesis is the design implementation, which involves creation and configuration of the Mesh Network. Network configuration consisting of two Gateway points and afterwards behaviors of the network in a steady state versus one gate failure are compared. Furthermore, implementation of QoS according to components that support two types of QoS assurance regarding type of bandwidth reservation and defined traffic classes. In conclusion, the thesis describes measurement methods of QoS parameters for chosen applications, evaluation and comparison of measurement results for both types of Quality of Service assurance.
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Numerical Modelling of Counter Flow in T-Junction
Míčka, Martin ; Šperka, Oldřich (referee) ; Štigler, Jaroslav (advisor)
The main objective of this master thesis is to implement the numerical modelling of the confluence of streams in the Tee-junction using Fluent CFD software. Modelling is carried out for different ratios of flow rates in steady flow. Calculations are evaluated, using a new mathematical model, by curves of loss coefficients. Furthermore, the influence of the selected type of the mesh in geometry on results from numerical modelling of flow is examined. Geometry of the Tee-junction is created in Gambit software. Finally, the results obtained from numerical modelling are confronted with results from an experiment.
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Flow modelling for applications in process industry
Bialožyt, Michal ; Jegla, Zdeněk (referee) ; Hájek, Jiří (advisor)
Tato diplomová práce se zabývá vlivem zjednodušené geometrie na výpočet pomocí počítačového modelování proudění. Konkrétně se jedná o možnost náhrady části trubky porézní vrstvou, která má odpovídající tlakovou ztrátu jako nahrazený úsek. Řešen je také přestup tepla a jeho vliv na proudění a tlakovou ztrátu. Jako nejúčinnější řešení se ukázalo zakomponování vlivu přestupu tepla na tlakovou ztrátu do porézní vrstvy. Toto řešení nevyžaduje použití rovnice energie a je tudíž nejméně výpočetně nákladné. Získané poznatky jsou poté testovány na modelu reálného výměníku tepla, který má problémy se zanášením a distribucí proudu. Náhrada porézní vrstvou se ukázala jako spolehlivé řešení. Dalším bodem práce je testování závislosti výpočtu turbulentního difúzního spalování na jemnosti výpočetní sítě. K tomuto účelu byl využit model spalovací komory. Po prvním výpočtu byla výpočetní síť, na základě výsledků, zjemněna v oblasti vířiče a v oblasti plamene, kde dochází k největším gradientům. Po adaptaci výpočetní sítě bylo dosaženo téměř dvojnásobného počtu buněk a výpočet byl opakován. Výpočet s adaptovanou výpočetní sítí se ukázal být mnohokrát časově náročnější a byl proto zastaven jelikož přesahuje rámec této práce. Předběžné výsledky byly zpracovány.
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