National Repository of Grey Literature 56 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Condition monitoring technique for smart diagnostics
Dostálek, Jakub ; Čala, Martin (referee) ; Pikula, Stanislav (advisor)
This thesis deals with the use of the Teager-Kaiser energy operator (TKEO) for state monitoring and testing its use for determining the instantaneous frequency and amplitude in comparison with the results of other methods (e.g. with the Hilbert-Huang transform method) and for this comparison uses various simulated and real signals. This process is programmatically implemented in LabVIEW, and tests are designed and programmatically implemented to evaluate the pros and cons of using these methods to determine the instantaneous frequency and amplitude for different kinds of signals.
Measurement automation of simple electrical circuit
Gála, Michal ; Čala, Martin (referee) ; Havlíková, Marie (advisor)
Document describe simple electrical circuit from theory and subsequently complex double-port from practical measure. On measurement is using automated measuring system. Document describes the adjustable parameters of measuring devices used in automated measuring system, the reason why they were chosen and the practical implementation of the measurement system. Process control measurement is used on measurement application. Document concerns the choice of program, which is use of programmed measuring application, and also analyze various subtasks in specifically stages of application. Document presented the functionality of measuring applications with a consistent example of measurement. In conclusion of document is contain evaluation of the results that have been achieved during development.
Library for manipulation with specific TDMS files
Prusák, Lukáš ; Pikula, Stanislav (referee) ; Čala, Martin (advisor)
The goal of this work is to create a library in LabVIEW environment that works with specific TDMS files, oversized or malformed. In this work, the library focuses mainly on reading the TDMS file, its defragmentation and the tool for generating errors in the TDMS file. The main contribution of this work is a detailed explanation of TMDS format and problems we can encounter when processing files of this format.
Simulator of typical rotational machinery components faults
Vaľko, Matej ; Beneš, Petr (referee) ; Čala, Martin (advisor)
The objective of this thesis is to create a library in programming environment LabVIEW by company National Instruments, which objective is to simulate vibrations of different mechanical components, such as shaft, rolling element bearings, plain gearing and planetary gearbox in different circumstances and failures. The theoretical part contains information about typical failures of this mechanical components and their typical failure frequencies obtained from literature. In the description of theoretical part is inscripted simulator with user interface in already mentioned programming environment LabVIEW. Result of this thesis is library, which images time course of vibrations and spectral analysis for diffrent components with their respective failures.
Laboratory device for courses BPC-VIA/MZPD
Platko, Peter ; Uher, Miroslav (referee) ; Čala, Martin (advisor)
Bachelor's thesis deals with design of laboratory device for BPC-VIA and MZPD courses, device works with data-aquisition card NI myDAQ and LabVIEW enviroment. Document consists of description of NI myDAQ, description and design of waveform generator, description and design of sensor circuits for temperature, humidity, illuminance, revolutions, noise and vibrations. Then a design of device and it's power source, buttons and fans, design of PCB and price calculation. The last chapter describes example programs that are made in LabVIEW enviroment and use signals from device.
Measuring the Sun's position
Bajer, Patrik ; Čala, Martin (referee) ; Beneš, Petr (advisor)
The bachelor thesis deals with the design of a sensor for measuring the position of the Sun. In the first part, a theoretical analysis is made concerning methods of indicating the position of the Sun, patent searches and commercially available devices. The second part includes the preparation, the computer simulations performed, the actual design of the sensor and the evaluation of the results obtained.
Instrument driver for two-channel waveform generator Aim-TTi TG501xA series
Opravil, Michal ; Klusáček, Stanislav (referee) ; Čala, Martin (advisor)
The bachelor thesis deals with designing and describing of instrument driver for generator Aim-TTi TG501xA series in LabVIEW development environment. In the thesis is defined the structure and requirements for creating of instrument driver for Aim-TTi TG5012A generator. Therein are also mentioned the parameters and advantages of the generator. To meet the requirements for the instrument driver the functions were defined, thereby generator may be controlled over USB or LAN. The other supplied functions are determined to generate all available signals and set their parameters. The validity of parameters set are examined by the function for monitoring of set-up that reads the data from error register of the generator and verifies the correctness of the adjustment of parameters. All functions uses the NI VISA libraries containing the functions for communication and functions providing read and write support for the device. All created functions were tested on generator TG5012A communicating via USB and LAN. For better comprehension, there is a set of examples given demonstrating the involvement and applicability of each function.
The tester semiconductors device
Čala, Martin ; Čejka, Miloslav (referee) ; Havlíková, Marie (advisor)
Theoretical part of the bachelor thesis describes ATE systems focused on electrical tests of semiconductor diodes. There are also described key features of measured devices. In the practical part of bachelor thesis, there are described analysis made before design and realization own tester capable of recognizing unknown semiconductor diode and displaying selected static and dynamic parameters via text and graphical output. Whole system is based on Elvis II+ platform. Controlling application is made using MATLAB.
System for verification of the signal quality dependence of a laser vibrometer.
Skalský, Ondřej ; Čala, Martin (referee) ; Pikula, Stanislav (advisor)
This thesis deals with a general theoretical description of the laser Doppler vibrometer with respect to parasitic phenomena, the design and implementation of a measurement system verifying the effects of these phenomena and the measurements performed. For a better understanding, the theoretical part includes not only a discussion of the principles of the laser Doppler vibrometer and its parasitic effects, but also the principles that the laser Doppler vibrometer uses to operate and on which it is based are discussed in detail. Mention is also made of vibrometers of other principles. The practical part of the thesis deals mainly with the design and implementation of a measuring system that can measure the dependence of the quality of vibration measurement on the angle and distance of the surface. This includes, of course, the presentation of the measured data, which to some extent confirms the theoretical assumptions, but also reveals new findings.
Datalogger
Hons, Viktor ; Čala, Martin (referee) ; Beneš, Petr (advisor)
This thesis deals with the making of a datalogger, which saves the data from differential pressure sensors placed on a building shell. These sensors measure negative pressure from the airflow around the building. The first part of the thesis includes market research of available dataloggers, industrial modules suitable for this application and appropriate differential pressure sensors. The device is assembled and programmed. Testing in real conditions on a horizontal roof with tiles is performed. The last part discusses programming and data processing, using script in Matlab software.

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