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Micro-hydraulics system design
Pitaš, Martin ; Marada, Tomáš (referee) ; Věchet, Stanislav (advisor)
One of the main aims of presented bachelor's thesis is an implementation of hydraulic circuit by micro-hydraulics system. Bachelor's thesis has three main part. First part deals with hydraulic distribution and selection of acceptable devices of hydraulic circuit, especially their advantageousness in term of finance. Second part is devoted to the construction of fixation for the position sensor on linear hydromotor, holder for hydraulic valve and hydrogenerator. Third part describes to hydraulic circuit, right hydraulic oil for whole hydraulic circuit. The verifying calculation confirming rightness selection particular devices is here also. Autodesk Inventor Professional 2008 (chapter 3) a FluidSIM Hydraulics V 4.2 Demo Version English (chapter 4) was used as a general software.
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Position control of servo with discontinuouns rechangeable speed
Jindra, Pavel ; Věchet, Stanislav (referee) ; Němec, Zdeněk (advisor)
Diploma thesis work includes simulation of compensation of control for discrete. The aim of the work is a solution positioning control of servomotor drive piston, which is controlled by pass of the pressure oil with the help of several electromagnetically controlled switchboards with the orifice in the output channels. The verification activities of the regulated system is done using simulation in Matlab/Simulink and Matlab/Simulink, Matlab/Hydrosim. The requirement on the created model is to verify the behavior of the system to be modified to be used for the further development of the issue
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Initiation and development of cyclic damage in steel for the energy industry
Horník, Vít ; Mazal, Pavel (referee) ; Věchet, Stanislav (advisor)
The main content of this master's thesis is a determination of the fatigue properties by using non-destructive testing methods – the acoustic emission technique and the X-ray diffraction. The reactor steel, that is named GOST 15Ch2NMFA, is used as a model material and is used to manufacture VVER-1000 reactor pressure vessels. The supplied material was made of two different steel melting, designated as H and S. For the basic measurement of the fatigue properties the stress-cycle asymmetry R = -1 was used. Some of the samples were used for approximate determination of the fatigue strength stress-cycle asymmetry R = 0. During the loading process the resonance frequency of the loading machine and acoustic emission signals were recorded. The changes in microstructure were estimated from the record of acoustic emissions during the whole fatigue life. The change of the microstructure was experimentally observed by X-ray diffraction analysis. The mechanism of the fatigue can be described by the observation of the microstructural processes as well as the relevant bifurcation with sufficient sensitivity. The results of the used methods indicate a decay and re-growth of mosaic blocks during the whole loading process. Therefore, it is important to find a correlation of these two non-destructive methods, or to use other non-destructive testing methods in the future.
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The influence of first CNN layer initialization on training convergence
Krejsa, Jiří ; Věchet, Stanislav ; Chen, K.S.
During evaluation of convolution neural networks on the task of sign language single hand alphabet classification we have discovered that in small but not negligible number of cases the training of the network does not converge at all. This paper investigates the problem that we believe is independent of the application. While the true cause of training divergence was not discovered, we can offer the reader an easy solution from practical point of view – initialization of the first CNN layer using pretrained networks parameters.
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Design and implementation of an automated robotic workplace for controlled plant cultivation
Kazda, Jan ; Adámek, Roman (referee) ; Věchet, Stanislav (advisor)
This bachelor thesis will deal with the design and implementation of a robotic workplace for controlled plant cultivation. This system will be operated by 4 robots. The communication between the robots will be provided through a Programmable Logic Automaton. Calibration processes will be developed for the robots to achieve the required working accuracy of the robot. In order to perform these calibrations, calibration marks will be created for the cassettes that house the petri dishes. The cassettes are described as carriers for the individual petri dishes. Finally, verification of the real functionality of the system will be addressed.
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Application of NB-IoT technology
Cagáň, Juraj ; Věchet, Stanislav (referee) ; Krejsa, Jiří (advisor)
The initial chapters of master’s thesis focus on NB-IoT technology and its alternatives within the field of Low-Power Wide-Area (LPWA) networks. The research is further enhanced by comparing various commercial IoT platforms, protocols, and wireless networks, that are intended for local communication between sensors and IoT devices. The subsequent section defines the goals of this project and presents the approach taken towards examining the given issue. Based on the research findings, the main parts of the technological demonstrator are outlined in greater detail. The practical section elucidates the selection of appropriate microcontrollers and sensor nodes, while also covers the design of a customized printed circuit board. Additionally, it describes the control algorithm at a higher level of abstraction. The thesis includes the design of communication for collecting sensory data through a commercial cloud platform, as well as the development of a simple user interface. Finally, the thesis concludes with practical testing of NB-IoT network parameters, followed by the implementation of a demonstrative application on a real system.
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3D model registration with depth camera data
Boháč, Daniel ; Věchet, Stanislav (referee) ; Adámek, Roman (advisor)
Tato práce se zaměřuje na úlohu 3D rozpoznání objektu a odhadu jeho transformace na základě dat získaných z hloubkové kamery. Konkrétně jde o mračna bodů, přičemž jedinou referencí pro dané objekty jsou jejich 3D modely. Cílem práce je vybrat vhodný algoritmus na základě provedené rešerše, implementovat řešení využívající tento algoritmus, ověřit jeho funkčnost a identifikovat jeho limity. Práce představuje snadno použitelnou a rozšiřitelnou knihovnu napsanou v C++, která je dostupná také prostřednictvím Pythonu. Tato knihovna využívá postup identifikovaný během rešerše, který řeší danou úlohu pomocí globálních deskriptorů. Nakonec je řešení ověřeno na umělých i reálných datech.
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Design of a simulation environment for testing the operation of autonomous vehicles
Šůstek, Jan ; Krejsa, Jiří (referee) ; Věchet, Stanislav (advisor)
This thesis deals with the design of simulation environment for testing autonomous vehicles. In the theoretical part, the search of available autonomous driving simulators was carried out. Furthermore, the tools commonly used in autonomous vehicles such as sensors or software modules were presented. In the practical part, the CARLA simulator was selected from the available solutions. Firstly, the installation of CARLA simulator is explained. Then, the simulation map was created by the Roadrunner to simulate a specific street in Brno. Afterwards, the work with the CARLA simulator is shown. Finally, the work with the CARLA simulator is evaluated and the concrete outputs of simulation are shown.
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