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System for verification of the signal quality dependence of a laser vibrometer
Skalský, O. ; Pikula, S.
The paper describes impact of a laser vibration measurement parameters on the signal quality of vibration measurement using Laser Doppler Vibrometer (LDV). Among these parameters are distance, perpendicularity, material, roughness or polarization properties of the measured surface. Follows the presentation of the measurement system that will be able to measure the quality of the LDV signal affected by these influences for a specific surface, at different distances and angles. Based on the characteristics obtained, it will be possible to assess the suitability of the measured surface for LDV use.
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3D Scanning System Proposal for Plastic Parts
Palátová, Zuzana ; Jankových, Róbert (referee) ; Sámelová, Vendula (advisor)
The diploma thesis is focused on monitoring and description of the current state of plastic injection molding production and analysis of methods for measuring these parts. Measurement methods are described and at the same time the measurement issues associated with individual types of meters for specific plastic parts are presented. Based on the analysis of measuring systems, a design of the measuring device in the form of a 3D optical scan is subsequently created, which is optimal for the selected plastic components. When choosing a 3D optical scanner, a demand is created that takes into account the necessary technical parameters required by the corporate environment. A selected proposal is presented at the end of my work.
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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.
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Communication in Mobile Robotics
Hýbl, Matouš ; Jílek, Tomáš (referee) ; Žalud, Luděk (advisor)
Cílem této práce je poskytnout náhled do způsobů, jakými by se daly vylepšit komunikační spoje používané v mobilní a zejména servisní a záchranářské robotice. Elektromagnetické spektrum, zejména rádiové spektrum, je rozebráno vzhledem k nutnosti určit frekvence na kterých je možné komunikační spoje provozovat. Dále jsou popsány digitální modulace, jelikož mají vliv na chování signálu v přítomnosti rušení. Rovněž jsou popsány možnosti vylepšení komunikačních spojů, a to včetně jejich vhodného použití a možné implementace. Je vyvinut komunikační subsystém založený na routerech MikroTik. Tento komunikační subsystém je schopen retranslace a je vybaven hardwarem potřebným pro implementaci záložního spoje založeného na LTE. Jako testovací robot je oživen robot Orpheus HOPE, který je vybaven novou řídicí deskou, firmwarem, zmíněným komunikačním subsystémem a přejmenován na Orpheus CT. Dále je vyvinut systém pro měření vlastností komunikačních spojů, který je následně ověřen během dvou experimentů. Třetí experiment se zabývá testováním funkce retranslace komunikačního subsystému. Zhodnocení experimentů ukazuje, že zmíněný měřicí systém funguje a že komunikační subsystém je vhodný pro použití v robotech servisní a záchranářské robotiky.
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Measurement System for Etched Track Detector
Galbavý, Juraj ; Levek, Vladimír (referee) ; Novotný, Radovan (advisor)
The aim of this thesis is to design an algorithm for an automatic track counting of an image of etched track detector made of CR-39 polymer. Tracks are produced by alpha particles. Chemically etched detector is imaged using a microscope resulting in 64 images of segments on the surface of the detector. Circle shaped tracks in the images have to be detected and counted. This thesis evaluates the utilization of circle hough transform for circle detection. The final software should automate a detector track counting and should also account for defects in the image and contamination of detector surface. The software will produce a measurement report with a total track count in each segment.
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CAN Protocol for Automation
Verčimák, Mário ; Jirgl, Miroslav (referee) ; Hynčica, Ondřej (advisor)
The thesis describes basic properties of CAN Protocol. Next point of this thesis is implementation of CAN protocol into Kinetis microcontrollers with use of Kinetis Design Studio. Thesis also describes real application for CAN communication testing. Measurement is realized in school and real industrial conditions. Next point is implementation of real time operating system MQX and creating a task for CAN communication.
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Web interface for a measurement module
Łabudek, Daniel ; Kuběna, Tomáš (referee) ; Zezulka, František (advisor)
The work solve the design and implementation of web application to measure analog inputs, setting and measuring the digital input and output of the measuring module based on microcontrollers ATMEL ATMEGA64. For connecting to internet is use a module LanReach by company Connectone. Measured values are displayed on the website or send via e-mail messages.
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Crosswind Sensitivity of Road Vehicles
Vančura, Jan ; Dundálek, Radim (referee) ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The aim of the thesis is to devise a methodology which is capable of reliable evaluation of road vehicle’s crosswind sensitivity. The work consists of writing the mathematical model of a vehicle which includes aerodynamic loads and conducting a validation by means of technical experiment as defined by ISO 12021. A sensitivity analysis describing the influence of individual inputs on evaluation criteria of vehicle’s crosswind sensitivity is performed using the model, thereby establishing the overall model error caused by possible inaccuracies of input parameters. At the end, the relationship between discrete pressures on the surface of the vehicle in several aerodynamic configurations and the properties representing the vehicle’s motion is presented.
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Vibration and Acoustic Emission Reduction of Powertrains using Virtual Engine
Svída, David ; Kovář, Rudolf (referee) ; Dundálek, Radim (referee) ; Kovář, Rudolf (referee) ; Dundálek, Radim (referee) ; Píštěk, Václav (advisor)
Doctoral thesis deals with combustion engine cranktrain vibrations and vibration analysis methods. The work applies new computational models aimed at powertrain vibration decrease. The computational models can be used in the first stages of powertrain development. Temperature dependences of the rubber shear modulus and loss factor characteristic are found by response analysis of the free damped vibrations in the first part of the thesis. Viscoelastic model parameters of two dampers with different rubber hardness are calculated using optimization methods. Temperature distribution inside the rubber part during the harmonic oscillation is calculated with the knowledge of previous values. Computational models together with a user interface are assembled in Matlab/Simulink software tool. Computational model results of the viscoelastic rubber damper are verified by measurements on a prototype diesel engine in the whole operating engine speed range. Torsional vibrations of the crankshaft with torsional damper are measured by POLYTEC laser rotational tools. The temperature distribution on the damper surface is obtained by Infratec VarioCAM thermographic system. Combustion pressures in the cylinder are measured by SMETEC Combi indication tools. Both the temperature distributions and combustion pressures are used for computational purposes. All the measurement procedures are described also in the thesis.
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Vehicle Dynamics Measurement Analysis Using Mathematical Modelling
Blaťák, Ondřej ; Kledus, Robert (referee) ; Mazůrek, Ivan (referee) ; Kaplan, Zdeněk (advisor)
This doctoral thesis is focused in connection of measurement with a model in this meaning. Only relative easier measurable variables are measured on a vehicle and these variables make model inputs. This process can be improved by using dynamic filtering principles, where measured variables are used not only as model inputs, but they are used for the correction of a model motion too. We can obtain an optimal estimate of vehicle real behaviour during a manoeuvre with using this method. Linear discrete Kalman filter (dynamic filter) was used for the connection of the measurement with the mathematic model with regard to chosen model (planar linear single track model). The main task of Kalman filter is try to estimate the state of the discrete time depending process that is determined by the linear stochastic difference equation. Effective measurement system (based on CompactRIO unit) was built within the scope of this PhD thesis. This system is able to measure simultaneously a lot of quantities on the experimental vehicle. Velocity components (measured through optical correlative sensor Correvit), yaw velocity (measured through vibrating gyroscope), lateral acceleration, distance component (measured through MicrosatGPS system) are the basic measured parameters. Big attention was paid to obtain other important inputs of the mathematic model such centre of gravity position, moment of inertia, steering ratio etc. The last part of the thesis is oriented on the real connection of the measurement with the mathematic model. Formula Ford 1600 was used as the experimental car. The driving manoeuvre was arranged according to the norm ISO/WD 3888/2. Three versions of the Kalman filter were realised, which differs in the measured variables used for the mathematical model motion correction. Other possibilities, how to improve the process of state variables estimation eventually how to effective use this algorithm for vehicle parameters identification (cornering stiffness of the tires for example), are sketched in the end of the thesis.
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