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Light wavelength measurement module
Matoušek, Vojtěch ; Štohl, Radek (referee) ; Havránek, Zdeněk (advisor)
Measurement of the wavelength of light source by means of dual-wavelenght photodiode sensor is easy and fast. From the dependencies of the measured voltages corresponding to generated photocurrents of both elements of dual-wavelength sensor it can be calculated the information about wavelenght and intensity of the measured light source. Evaluation, displaying on LCD and sendind of measured information to PC are ensured with microcontroller from the AVR family – ATMega32. One part of the project is also visualization software for PC. Measurement module can be powered with wall socket power adaptor or with battery.
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Remote data downloading from automotive digital tachograph
Matoušek, Vojtěch ; Macho, Tomáš (referee) ; Petyovský, Petr (advisor)
Thesis deals with device firmware design located in lorry, which provides remote access to vehicle digital tachograph data according to valid EU legislation. The result of this work is a system, which downloads digital data from digital tachograph and save them on remote server. The system for remote data downloading from automotive digital tachograph consists of three kinds of applications: server application, user application and firmware for communication device. Communication between applications uses encrypted TCP connection and own special designed messages.
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Automatic music transcription
Matoušek, Vojtěch ; Richter, Miloslav (referee) ; Petyovský, Petr (advisor)
This article deals with the automatic music transcription into the music notation by Fourier transform with logarithmic scale and constant Q transform. The result of this work is application, which converts the music records, in the WAVE music le, into the MIDI le. Then MIDI le can convert into the music notation by appropriate tool. Algorithm for automatic music transcription can converts polyphonic music record, where plays more tones at one time, with simple rhythm.
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CNC - design and contrlol
Matoušek, Vojtěch ; Burian, František (referee) ; Kopečný, Lukáš (advisor)
My task was to build a smaller structure triaxial CNC milling. I designed electronics for motion control. The main part is the implementation of the control unit, which will provide control of the machine. The work includes the complete design, PCB design and program description for the uP ARM. The unit can work independently as well as hardware interpolator connected to the PC.
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The limits of movement and quantification of bedload amount for gravel-bed rivers
Roušar, Ladislav ; Matoušek, Václav (referee) ; Tůma, Antonín (referee) ; Veselý, Jaroslav (advisor)
Doctoral thesis in detail and comprehensively deals with mechanic of incipient bedload motion for gravel-bed rivers. This study based on theoretical knowledge, experimental researches, numerical models and field survey extends present knowledge concerning with incipient bedload motion and sediment transport at small relative height and hydraulically rough surface bed for turbulent unaerated free surface flow. Incipient bedload motion and sediment transport have been determined for homogeneous and inhomogeneous bed materials. For homogeneous bed material the velocity profiles have been described by different methods in near the bed. Further, hydraulic flow resistance has been evaluated. In the case of inhomogeneous bed material, static armouring and influence of surface layer sorting on hydraulic roughness have been investigated. The correctness of obtained knowledge has been confirmed on the object of nature-inspired river widening. Results shown, among others, that incipient bedload motion does not depend on relative height or final armouring of surface layer to what extend hydraulic roughness is influenced.
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Trendy v chladicí technice
Matoušek, Vít
The bachelor thesis is focused on trends in the field of compressor refrigeration technology. The principle of basic refrigeration circuits is explained here, including the description and functions of individual components of the compressor refrigeration circuit. Part of the work is also acquainted with the refrigerants used in the refrigeration circuit, including the legislative rules that govern it. The main part of the work deals with the latest and most used systems in modern refrigeration systems. A new generation of refrigerants is also described here, which is becoming an alternative to environmentally hazardous refrigerants.
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Experimental validation of granular flow kinetic theory under turbulent flow conditions
Haidl, Jan ; Chára, Zdeněk ; Matoušek, Václav
The mixed classical and extended kinetic theory of granular ows is used for modeling the characteristics of particles-water turbulent sheet ow. The open-source solver sedFoam v3.1 is used for the 1-D and 2-D ow simulations. The simulation results are compared to the experimental data measured in the open channel. After that, the simulation parameters are optimized to achieve the best possible agreement between the simulation and the experimental results. The unsatisfactory performance of the KT models and the observed simulation instabilities are discussed.
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Analysis of the flow of a bimodal suspension at the pipe wall
Chára, Zdeněk ; Matoušek, Václav ; Novotný, Jakub ; Konfršt, Jiří
In the paper, the attention is focused on the flow of bimodal suspensions, where the coarse fraction is combined with the fine fraction with the resulting effect of reducing the total pressure losses. Using the PIV and PTV methods, the flow at the bottom of the pipe is analyzed. Using this approach, the velocities of both the bimodal mixture and the individual particle velocities of the coarse fraction were obtained. The velocities of the coarse particles were higher than the velocities of the fine fraction.
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