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Model of four-quadrant analog multiplier AD835 for PSpice
Kuřátko, David ; Brančík, Lubomír (referee) ; Šotner, Roman (advisor)
This bachelor's thesis deals with the analog behavioral modeling of the AD835 multiplier and its simple applications in PSpice. The first part of this thesis is focused to the theoretical analysis of analog multiplier in general. This is followed by an analysis of individual elements, which are suitable for modeling of this multiplier AD835 and possibility of substitution by other elements. The next part deals with the description of the multiplier AD835, an analysis of the proposed model and confirmation of several parameters with measurement. Finally, there was noted several applications with analog multiplier AD835. Simulation results of these applications are compared with ideal expectations.
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System level analysis of thermal properties of integrated circuits
Vaněk, Martin ; Jirák, Josef (referee) ; Frk, Martin (advisor)
Hlavním cílem této práce je shrnout základní poznatky o tématech spojených s teplem, se zaměřením na aplikace v elektrotechnice, a provést měření tepelného odporu pouzder integrovaných obvodů. První část je praktická a zabývá se teorií přenosu tepla, tepelnými vlastnostmi materiálů a metodologií JEDEC pro měření tepelných vlastností pouzder integrovaných obvodů. Druhá část se skládá ze sestrojení teplotní komory s přirozeným prouděním, návrhu testovacích desek plošných spojů a tepelných měření. Na závěr je shrnuta metodologie pro měření tepelného odporu čip-okolí spolu s uvedením praktických poznatků z předchozích měření. Tato práce může sloužit jako základ pro další vyhodnocování tepelných vlastností integrovaných obvodů a pro ověřování přesnosti tepelných simulací. Také může pomoci při vyhodnocování tepelné vodivosti desek plošných spojů.
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Calculation of temperature fields in induction machines
Horálek, Lukáš ; Dostál, Lukáš (referee) ; Janda, Marcel (advisor)
The issue of this thesis deals with the thermals electrical machines. Specifically, the calculation of temperature fields using the finite element method and analytical calculation of one of the machines with a replacement thermal circuit. Using Autodesk Inventor create a 3D model of the real electric machine and then in the ANSYS Workbench perform thermal analysis using finite element method. Next, perform analytical calculation of one part of the machine, namely the stator, using a simplified thermal replacement scheme. Also, we realize the measurement of temperature on the specific machine under various operating conditions, the calculations and measurements between them compared.
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Flow Measurement of Hot Dusty Gas
Dostál, Jiří ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
The bachelor thesis deals with the measurement of hot dusty gas. The introduction outlines the problems of measurement. Another part of the work contains a theoretical introduction to the measurement of gas flow. In successive chapters the basic principles and characteristics of suitable methods for measuring the hot dusty gases are described. Finally, the function blocks are implemented in the Simatic STEP7 for calculation of volume flow rate and blocks are tested on PLC.
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Use of mobile platforms Android for instruments control
Macek, Michal ; Šteffan, Pavel (referee) ; Frk, Martin (advisor)
The present work describes current trends and modern methods using mobile devices to operate laboratory equipment and subsequent measurements. The main objective is create application for mobile devices running on Android system, which will be remotely controlled and measured with instruments in the laboratory. Practical activities are focused on programming mobile application that can remotely laboratory device contact, set for different types of measurements supported device and then read the measurement data from the device to a mobile device.
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Measurement of transfer speeds and delays in computer networks
Bárdossy, Adrián ; Kubánková, Anna (referee) ; Jeřábek, Jan (advisor)
Bachelor thesis is interested in measurement of transfer rate and latency in computer networks. In the first part of thesis is defined, which motodics of measurement we know, various RFC and their specifications, also various parameters about measurement in computer networks like bit rate, capacity of channel, latency. In the second part are prepared users interfaces and softwares for applying the measurement of thesd parameters. In the last part is application of these softwares and creating and testing methodic of network measurement.
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Flow Measurement of Hot Dusty Gas
Dostál, Jiří ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
The bachelor thesis deals with the measurement of hot dusty gas. The introduction outlines the problems of measurement. Another part of the work contains a theoretical introduction to the measurement of gas flow. In successive chapters the basic principles and characteristics of suitable methods for measuring the hot dusty gases are described. Finally, the function blocks are implemented in the Simatic STEP7 for calculation of volume flow rate for the methods selected in the theoretical part and visualization in WinCC flexible.
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Advanced Utilization of Network Analyzers
Novák, Přemek ; Polívka, Michal (referee) ; Škorpil, Vladislav (advisor)
This bachelor´s thesis consists of description of the laboratory network Cisco and any of its components. Furthermore, the possibility of network analysis according to the standards RFC 2544 and EtherSAM and description of the measurement using analyzer Vepal TX300, Fluke NTS II and Sunlite E1 used in lab reports. In the first task, the characteristics of network elements are analyzing. In the second task, parameters of Cisco network are examined and the third task is focused on the E1 frame.
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Automation of measurement of transmission properties of DSL modems
Pokorný, Lukáš ; Šedý, Jakub (referee) ; Šilhavý, Pavel (advisor)
The work deals with transmission parameters of DSL systems and software development for the automated measurement. The first part is devoted to the transmission medium and modulation techniques. The following describes the detailed functions and features of ADSL2+ modems. Integral part of the work is the overview of the ITU test methodology, together with parameters of test loops and types of interference. Within the automation of measurement are described used Spirent simulators DSL414E and DLS8234 and important communication commands. The practical part is devoted to designing applications for control simulators and software for automated measurement. For implementation of algorithms and creation of graphical interface is used C++ programming language. Finally the results of measuring the transmission properties of ADSL and VDSL systems executed by created application are presented.
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Sensorless control of revolutions and position of DC motor
Kakáč, Petr ; Minář, Jiří (referee) ; Prajzner, Václav (advisor)
This thesis deals with the management and control of DC brush motors used in Honeywell actuators. The introduction describes the types of DC brush motors and possibilities of regulation. We chose the method of compensation of the load characteristics. The basic requirement for this job is a requirement to ensure constant engine speed under various load torque. For this requirement it is necessary to develop a mathematical model of the static engine, calculate, verify that the motor constants and, not least, the implementation of the static model for a given engine. The work focuses on the limits of such an engine control or the limitations that we created conditions in practice.)
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