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FTTB Network Design
Reichert, Pavel ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The purpose of this master’s thesis is to explain the issues of the FTTx network design. The main idea of this work is to describe to readers the methods of the designing the optical access networks. Especially we will speak about the building technologies and different topologies used in a practice. The different technologies of optical access networks’ building and various parameters, which are necessary to take into account in the designing of these networks, will be introduced. In the theoretical part, methods of measurement, which are like the needed part of each optical access networks’ building, will be described. Two purposes of the FTTB networks with all proprieties will be made and offered. One purpose will be solved by Point to Point topology and the second purpose will be solved by Point to Multipoint topology. Following the confrontation one of these purposes will be chosen and realized. By ITU recommendation, measurements will be performed on the built optical trace. The final protocols will be elaborated from these measurements. The built trace with all final reports will be prepared for assignment to the subscriber.
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Permeability measurements on samples taken in VD Šance
Souček, Kamil ; Georgiovská, Lucie ; Zajícová, Vendula
Krátká zpráva týkající se měření propustnosti na vzorcích odebraných na VD Šance. Zhotoviteli bylo předáno 6 ks odebraných zkušebních válcových vzorků jílových zemin o průměru cca 120mm a výšce cca 100mm. K měření propustnosti, na připravených zájmových zkušebních tělesech byly použity triaxiální propustoměrné komory a propustoměr s pneumatickým tlakovým systémem udržující jak konstantní hydraulický tlakový spád ve zkušebním tělese, tak konstantní plášťový tlak v rtiaxiální komoře v průběhu vlastního měření.
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Measurement of fluttering airfoil with two degrees of freedom
Štěpán, M. ; Šidlof, P. ; Vlček, Václav
The paper focuses on measurement of vibrating motion of an aerodynamic profile in wind tunnel of the Institute of Thermomechanics. The physical model of the NACA 0015 airfoil has been designed and fabricated, allowing motion with two degrees of freedom: vertical motion and rotation around the elastic axis. The motion of the airfoil was registered by length optical incremental gauge, separately by the high speed camera with synchronous measurement of pressures on the surface of airfoil. The amplified signals from the pressure sensors and strain gauges were acquired using the National Instruments data cards and Dewesoft measuring software. The results of the measurement are presented too.
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3D measurement of particle movement using one camera
Chára, Zdeněk ; Kysela, Bohuš
Article is focused on analysis of measuring 3D particle motion with one camera and light knife. The 3D spherical particle movement is measured using standard particle tracking method (two velocity components) combined with simple method based on light intensity of scattered light by the moving spherical particle.
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Evaluation and accuracy of the local velocity data measurements in an agitated vessel
Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk ; Kotek, M.
Velocity measurements of the flow field in an agitated vessel are necessary for the improvement and better understanding of the mixing processes. The obtained results are used for the calculations of the impeller pumping capacity, comparison of the power consumption etc. We performed various measurements of the local velocities in an agitated vessel final results of which should be processed for several purposes so it was necessary to make an analysis of the obtained data suitability and their quality. Analysed velocity data were obtained from the LDA (Laser Doppler Anemometry) and PIV (Particle Image Velocimetry) measurements performed on a standard equipment where the flat bottomed vessel with four baffles was agitated by the six-blade Rushton turbine. The results from both used methods were compared. The frequency analyses were examined as well as the dependency of the data rates, time series lengths etc. The demands for the data processed in the form of the ensemble-averaged results were also established.
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Proposal for a continuous monitoring system of power transformer
ROZMILER, Jiří
Work deals with the description of the purpose of installing continuous monitoring of power transformer oil, familiarization with the principle of its operation, including a description of monitored and evaluated variables. Furthermore, there is given a brief overview of the history of the use of these systems in the Czech Republic, the current state of technology offered, compared different methods of measuring key variables and their visualization. The aim of this work is not only to provide a comprehensive insight into this issue, but also check the results provided a continuous monitoring system in other ways to monitor parameters of power transformer. Results and the suitability of different systems and methods measurements is evaluated in the final chapter.
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Electronic Control Unit for Engines and its Diagnostics
ČERVENKA, Petr
This paper summarizes information to be used to gain background knowledge related to the control systems of the spark-ignition combustion engines of cars and their diagnostics. The essentials part of this paper includes the explanation of the principles of each part of the systems. Next part includes explanation of the serial and parallel diagnostics including examples of diagnostics measurements. Last part this paper is engaged in the measuring technology.
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Preliminary interferometry measurements of flow field around a fluttering NACA0015 profile
Vlček, Václav ; Kozánek, Jan
The paper presents experimental results of the optical measurements of flow field around a fluttering NACA0015 profile elastically supported with two degrees of freedom in subsonic wind flow. The high-speed camera was used for the interferometry visualization of the airflow in different phases of the profile motion. Special care was devoted to the plotting of the fringes near the surface of the profile, which was blurry due to the fast vibration. Examples of the interferograms, pressure and velocity development around the surface of the vibrating body and the phase shift between rotation and translation cycles are presented.
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