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Calibration and evaluation of data from strain gauges
Dubina, Jozef ; Jaššo, Kamil (referee) ; Vyroubal, Petr (advisor)
This bachelor's thesis describes calibration and evalution of data measured from tensometric sensors. The labour describes tensometers in general, their functions, aplications and principle of operation. Loading data from tensometric sensors is next part of this labour, where are informations how to convert analog signal to digital signal output, which is ready for processing and shows real values. After the signal is converted to digital, it is needed to calibrate tensometers to reach high precission values of weight according to reference load. Bachelor's thesis describes choices of electronic and mechanical components used for developing of digital scale. Software developing for this electronic device is described in next part of this thesis.
Home micro-wind power plant
Šmol, Vojtěch ; Máca, Josef (referee) ; Vyroubal, Petr (advisor)
The master´s thesis deals with the construction of micro wind power plants in domestic conditions. Firstly, theory about wind is discussed. In next part, the types of wind turbines and their parameters are listed. Furthermore, the design and production of a domestic micro wind turbine, the design of blades, hubs, brakes and speed sensors are addressed. Furthermore, the design and production of a synchronous generator with permanent magnets produced using 3D printing is carried out. Results from generator testing are shown. In the next part of the thesis, the issue of MPPT controllers is solved, the principle of operation, hardware and software and the results of testing are clarified. The last part deals with the testing of wind power plants in simulated conditions and in real operation.
Exposure equipment for PCBs
Fiala, Matouš ; Čech, Ondřej (referee) ; Vyroubal, Petr (advisor)
The Master's thesis deals with the fabrication of printed circuit board exposure devices, including establishing a theoretical basis for understanding the PCB production process, using lithography over a liquid crystal panel to create a motif. The thesis includes the creation of a CAD model of the device, including a UV source and then thermal simulation of the cooling of the device. The fabrication of the device also involved the creation of a custom motherboard that integrates all of the electronic components. The main result of this work is an assembled functional device with a unique LCD layer arrangement that allows reliable exposure of dual-layer PCBs, which is supported by testing. The most comprehensive part of this thesis deals with the development of a complete software platform, consisting of an application running on the microcomputer of the exposure device and a multi-platform application through which the device is wirelessly controlled.
Device for wireless transmission of electric current measurement data
Beran, Tomáš ; Čech, Ondřej (referee) ; Vyroubal, Petr (advisor)
The master thesis deals with the design of a communication and measurement subsystem for a device that processes current waveforms on medium voltage lines. The device consists of a source part, a measuring part with a current transformer, and a communication part. The work specifies the requirements for the communication and measurement part given by the customer. Based on these requirements, a communication protocol is selected and described that meets the requirements. Subsequently, the components forming the measurement subsystem are described. Furthermore, the circuit design of the selected components, including the design of the printed circuit boards is carried out. The PCB is then assembled and brought to life. The presented results are then measured on it.
Electro-Magneto-Hydrodynamic Model for Electron Microscopy
Mačák, Martin ; Horák, Vladimír (referee) ; Uruba, Václav (referee) ; Vyroubal, Petr (advisor)
This dissertation thesis deals with the description and development of an electromagneto-hydrodynamic model intended for electron microscopy. The basis of the work lies in the description of characteristic phenomena taking place in electron microscopes with a focus on environmental electron microscopy. The work dealt with a description of the electromagnetic field, supersonic flow of rarefied gas and a motion of relativistic charged particles in a gaseous environment. An electromagnetic model based on the definition of electric and magnetic vector potential was presented and was used for a simulation of an electromagnetic coil. The supersonic flow of a rarefied gas was defined by Navier-Stokes equations. In order to extend their application to low pressures, the boundary conditions for velocity and temperature were modified. Viscosity and thermal conductivity were subsequently introduced as functions of gas pressure. These adjustments were able to describe the effects of lower collision frequency of gas particles. The presented model was used for the analysis of a flow through a separate aperture and a differentially pumped chamber. Furthermore, the model and necessary adjustments for the description of relativistically moving particles were presented. The model was used for the simulation of electron optics. Separate attention was paid to the interaction of charged particles with a gaseous environment. These interactions had a stochastic character and the presented model described both elastic and inelastic collisions. The presented multiphysics model enables the simultaneous simulation of different physical areas and the interactions between them, which leads to a possibility of a more detailed description of processes and to the improvement of environmental electron microscope design.
Numerical Modelling of Hypersonic Flow of Spacecrafts
Mačák, Martin ; Vyroubal, Petr
Numerical simulations of rarefied gas flows are an important area in the design of aerospace vehicles. They can provide a suitable alternative to experiments, which can be often too complicated due to extreme conditions. Navier-Stokes equations, which describe continuum fluid flow, generally lose their applicability in low pressures. As a result, it is necessary to adjust these equations or use alternative models. This article studies the possibility of using a continuum numerical model for a simulation of a hypersonic flow of a reentry module. Based on the Knudsen number, it was shown that it is still possible to use Navier-Stokes equations either without any adjustments or with the addition of a slip flow boundary condition.
CoreXY type FDM 3D printer
Kyselica, Martin ; Vyroubal, Petr (referee) ; Jaššo, Kamil (advisor)
The aim of this work is a theoretical evaluation of the properties and differences between the relevant 3D printing methods with a closer focus on FDM. The principles of the basic types of 3D printer mechanisms using this technology are explained in more detail and compared with each other. The solution and parts list of FDM 3D printer with CoreXY mechanism is proposed which is then constructed and tested.
Precise drug targeting using electromagnetic fields
Matějka, Alexandr ; Vyroubal, Petr (referee) ; Mačák, Martin (advisor)
The present bachelor thesis deals with the study of electromagnetic fields used for precise drug targeting from the point of view of numerical simulations. This area is very interesting from different points of view. The use of numerical simulations is currently a very attractive, but not widely used solution. In this bachelor thesis, a numerical model is developed to model the phenomena under investigation. Furthermore, the effect of the proximity of the magnetic field source on the targeting efficiency of drug carriers was analyzed in this thesis. The use of simulations of the presented issue can help to streamline and accelerate the application of the stated methods in practical applications.
Welder for lithium batteries
Martinček, Martin ; Jaššo, Kamil (referee) ; Vyroubal, Petr (advisor)
This Bachelor’s Thesis deals with the composition of lithium batteries, lithium cell joining, and the design of a device customised for contacting an 18650-size cylindrical cell. The first part discusses the construction, basic materials of the lithium batteries and their applications. In the next section, an overview of several methods of cell contacting and their comparison with each other is presented. The last section discusses different parts of the design and construction of the device, working on the principle of spot resistance welding.
Calibration and evaluation of data from strain gauges
Dubina, Jozef ; Mačák, Martin (referee) ; Vyroubal, Petr (advisor)
This thesis describes calibration and evaluation of data measured from tensometric sensors. The labour describes tensometers in general, their functions, aplications and principle of operation. Loading data from tensometric sensors is next part of this labour, where are information how to convert analog to digital signal output, which is ready for processing and shows real values. After signal is converted to digital signal, is needed to calibrate tensometers to receive high precission values of weight according to reference load. Thesis describes choices of electronic and mechanical components for building digital scale. Software developing for this electronic equipment is described in next part of thesis.

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2 Vyroubal, P.
2 Vyroubal, Pavel