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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
201

Design and Construction of a Supervisory Control and Data Acquisition System for full scale combustion test facility

Abeyrathna, Nuwan January 2013 (has links)
One of major concerns in gas turbine industry is to reduce emissions.  Tow kind of approaches could be identified in the industry to reduce emissions, namely Primary Emission Reduction approach and Secondary Emission Reduction approach. The primary approach concerns emission prevention in combustion, while secondary approach is all about emission cleanup before releasing to the atmosphere. Combustion flame temperature highly influences on emissions specially NOx formation.  NOx emission is lower when the combustor operates close to lean flammability limit. Incorporating catalyst to combustor is one of methods to extend flammability limit.  Heat and Power Division at KTH-Royal Institute of Technology in Sweden has developed a test facility to test performances of catalyst in combustion. The combustion test facility available at Heat & Power Davison at KTH, consists of high pressure air compressor and air flow control system, air preheating unit and control system, fuel flow control system, combustor unit, and exhaust gas analyzer system. But lack of proper user interface to control and monitor the operation of the test facility through a computer work station was a major concern from experimenters. The purpose of the thesis work is to design and construction of supervisory control and data acquisition system for the full scale catalytic combustion test facility.  Labview 2012 is used as the main platform for implementing data acquisition and control system for the test facility. Thermocouples, pressure transducer signals, air flow meter signal are connected to Keithley 2701 data acquisition system and then connected to the computer. Fuel flow controllers are directly connected to the computer via serial port. Air flow control actuator signal is given through ADAM digital to analogue converter. Developed GUI is more convenient for users in terms of easy control of air flow, fuel flow and gas sampling probe systems, and monitoring of temperature, pressure measurements and exhaust gas species systems. And also GUI provides web interface to select correct conversion factor, and also to view live data recording. The developed GUI can be accessed through online to monitor the operation.
202

Analyse und Validierung unterschiedlicher Merkmalsextraktionsalgorithmen auf LabVIEW-Basis zur Maschinendiagnose nach DIN ISO 10816-3

Nickel, Helge 18 March 2021 (has links)
Zustandsveränderungen von Maschinensystemen äußern sich in der Erhöhung, Verschiebung oder Häufung von Schwingungsamplituden. Die dynamische Datenerfassung war schon immer das Herzstück jeder Schwingungsmessung. Es reicht aber nicht aus, nur Daten zu erfassen, sondern es muss auch möglich sein, die Rohdaten zu analysieren, zu verarbeiten und in aussagekräftige Inhalte zu interpretieren, um Rückschlüsse auf den Qualitäts-, Wartungs- und Schädigungszustand ziehen zu können. Diese Arbeit behandelt die Entwicklung eines App-basierten Messsystems zur messtechnischen Erfassung, Analyse und Visualisierung von Schwingungssignalen, um eine aussagekräftige Zustandsbeschreibung vorzunehmen. Ferner betrachtet sie verschiedene normative Verweise, welche in der Messgeräteentwicklung und Schwingungsdiagnostik relevant sind. Ein Vergleich der LabView- und Matlabprogrammierung und deren analytischen Ergebnissen sowie ein Ausblick schließen diese Arbeit ab.:1 Einleitung 9 2 Hintergrund 11 3 Normative Verweisungen 18 3.1 Weitere Techniken 24 4 Hardware 25 4.1 Visualisierung Neopixel 31 5 Software 33 5.1 LabView 33 5.2 Main 34 5.3 Benutzeroberfläche „page 1“ 35 5.3.1 Time Signal 35 5.3.2 Fast Fourier Transform 36 5.3.3 Wavelet 38 5.3.4 Enveloping 39 5.3.5 Enveloping Spectrum 40 5.4 Benutzeroberfläche „page 2“ 41 5.5 Benutzeroberfläche „page 3“ 43 5.6 Mathematik und programmatische Umsetzung 44 5.6.1 Main 44 5.6.2 Time Signal 46 5.6.3 Fast Fourier Transform 50 5.6.4 Wavelet 53 5.6.5 Enveloping 62 5.6.6 Cepstrum 66 5.7 Messungen 68 5.7.1 Hinweise zur Verwendung des VMS 68 5.7.2 Time Signal 69 5.7.3 Fast Fourier Transform 70 5.7.4 Enveloping 71 5.7.5 Enveloping Spectrum 71 5.8 Zusammenfassung und Rahmenbedingungen 72 6 Schlussbetrachtung 75 7 Quellenverzeichnis 78 8 Abbildungsverzeichnis 81 9 Tabellenverzeichnis 84 10 Eidesstattliche Erklärung 85 11 Anhang 86 11.0.1 Spezifikationen 86 11.0.2 Arduino-Sketch 87
203

Optimalizace stavového regulátoru pro řízení DC motoru na FPGA / Optimization of the DC motor state space controller for FPGA

Maliszewski, Michal January 2017 (has links)
This thesis deals with the optimization of state space controller of DC motor on FPGA in LabVIEW environment on NI cRIO platform. In the first part, the state space model of the given DC motor is presented in Matlab/Simulink and then the position feedback controller with steady-state error elimination and with state observer with error compen-sation using LQR method is designed. The thesis continues with transforming the con-troller to LabVIEW environment where the code is edited for FPGA use. Next, the fo-cus on FPGA hardware resources consumption optimization leads to careful work with fixed-point data type. After successful code compilation on target hardware, the real given DC motor is connected and the series of tests are performed. The output of the thesis is working state space controller running on FPGA and the graphical user inter-face on real-time host cRIO, which enables the user to control the plant and save the data on the disk.
204

Návrh editoru typových štítků / Design of nameplates editor

Svoboda, Filip January 2017 (has links)
The diploma thesis deals with the problematics of type labels, used for marking of products in series production. The research part of the thesis deals with the issues of the used label media and label printing. The issue of content and design of labels is analyzed. The result of thesis is a graphic editor for designing labels and their translation into ZPL II. This language is mainly used by Zebra Technologies printers, which are very common used in industry.
205

Řízení BLDC motoru pomocí LabView FPGA / BLDC motor control using LabView FPGA

Ruhás, Sándor January 2018 (has links)
This thesis focuses on BLDC motor control algorithms with model based design approach. Models and control algorithms were programmed in LabView, the NI MyRIO was used as a hardware platform. For hall-sensor feedback controlled application an already finished power inverter was used from a Honeywell rotary actuator. For sensor-less motor control an indirect sensing of BEMF signal is applied using motor phase current measurement. The time-critical parts of the algorithms are programmed for FPGA, the non-time-critical parts are programmed for LabView Real-Time module.
206

Informační systém pro podporu výroby / Data storage architecture for manufacturing processes

Homzová, Michaela January 2018 (has links)
This work is covering desing of database system which stores results of measerements performed on test stations which are part of assembly line.
207

Měření akustických polí bezkontaktními optickými metodami / Measurement of sound fields using non-contact optical methods

Karásek, David January 2019 (has links)
The purpose of this paper is to assemble measurement chain dedicated to contactless measuring of acoustic fields emitted by test sources and to validate its results. At first author discusses possible optic methods which can be used to measure acoustic fields, then he talks about theoretical foundations which are needed to measure data and to reconstruct final data. The last two chapters are dedicated to cover basics about created program and to analyse various aspects which influence measured and reconstructed data. Created measurement chain is fully functional, at the end of this thesis are proposed some ways of improving
208

Měřicí systém pro záznam a zobrazení NF magnetického pole / Measuring system for recording and displaying LF magnetic field

Dušek, Jiří January 2019 (has links)
Diploma thesis describes types and measuring principes of magnetic field as first. Furthermore it deals with parameters of sensor HMC2003 and data acquision. Selected card for acquision was USB-6218 from company National Instruments. After that project describes programing interface LabVIEW, which was used for desing of acquision program. Next part deals with comuncation between card and computer, drivers and properties of card. After that were explained requirements on measuring interface. Furthermore it deals with basic parts of the acquision software and describes its function with connection to user interface. Finally the interface was tested.
209

Optovláknový sensor na principu vícemódové interference / Fiber-optic sensor based on multi-mode interference

Hedl, Michal January 2020 (has links)
This diploma thesis is focused on measurement of the physical quantities by fiber optic sensors based on multimode interference. The objective is to evaluate the appropriate method of signal provided by the spectrum analyzer. Firstly, a review of optics, optical phenomena and fibers is performed. The basic theory necessary for the realization of measurements and the principal of fiber optic sensors and SMS (singlemode–multimode–singlemode) structures are discussed. Finally, the automated measuring workplace for absorption spectrum measurement is created and described. Given data are finally evaluated by an artificial neural network and a sensor concept for practical utilization is designed.
210

Analýza slabých stránek laserového 2D vibrometru a jeho vylepšení / Weaknesses analysis of a 2D laser vibrometer and its improvement

Vybíral, Ondřej January 2021 (has links)
The master's thesis follows the work of Ing. Tomek, who briefly describes and analyzes the weaknesses of this original solution. Based on the analysis, fixes for vulnerabilities and proposals for new functionalities are proposed. It also describes their implementation and correction of other shortcomings found, including implementation into the original program. The result is better user friendliness of the program and its better functionality. Verification of the functionality of the new improvements is tested using a control measurement of a harmonically excited beam. The last chapter contains suggestions and recommendations for further software development.

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