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Comparison of methods for identification of rolling bearing failures
Kokeš, Miroslav ; Hnidka,, Jakub (referee) ; Klusáček, Stanislav (advisor)
The aim of this master thesis is the comparison of selected methods and parameters for roller bearings diagnostics. Selected statistical parameters are kurtosis, crest factor, and parameter K(t). The other selected methods are envelope analysis, cepstral analysis, and ACEP method. These methods are implemented in LabVIEW software and compared based on noise resistance, computation speed, and overall capability of identifying roller bearing faults.
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Near-field acoustical holography methods in LabVIEW environment
Majvald, František ; Hnidka,, Jakub (referee) ; Havránek, Zdeněk (advisor)
Near-field acoustical holography is a standard method for sound source visualization and localization. In this thesis, commonly used and newly published near-field acoustic holography methods are introduced and analysed. In addition, regularization methods are presented together with finding options of optimal regularization parameter. Based on theory, a LabVIEW library is built containing four implemented near-field acoustical holography algorithms and two regularization methods. To verify the correctness of implementations, a testing application has been made. This application allows testing of implemented algorithms with simulated or experimentally measured data. The correctness of implementation is verified, and algorithms are compared to each other with respect to accuracy and speed of calculation.
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Design and Implementation of Algorithms for Compensating the Effect of Linear Acceleration on Angular Velocity Measurements by MEMS Gyroscopes
Spáčil, Tomáš ; Luczak, Sergiusz (referee) ; Hnidka, Jakub (referee) ; Grepl, Robert (advisor)
Tato Disertační práce se zabývá vývojem nového typu dopředného kompenzátoru, speciálně určeného k potlačení vlivu lineárního zrychlení a ryvu působícího na MEMS gyroskopické senzory. Z principu funkce inerciálního snímače, dochází při umístění gyroskopického senzoru mimo osu rotace k vzniku dalších nežádoucích sil (normálové a tečné), které negativně ovlivňují měření žádané úhlové rychlosti. Přítomnost těchto sil je však možno měřit nezávislým senzorem, akcelerometrem, a vhodným způsobem kompenzovat výstupní hodnotu gyroskopického senzoru a tím zpřesnit nepřímo měřenou hodnotu úhlové rychlosti. V první části práce identifikujeme vliv zmíněných zrychlení na MEMS gyroskopy, v drůhé části práce pak navrhneme a otestujeme různé kompenzátory, vyhodnotíme jejich efektivitu a v třetí části vhodný algoritmus implementujeme na RT HW.
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Verification of rotor model properties for sleeve bearings
Šály, Timotej ; Hnidka, Jakub (referee) ; Klusáček, Stanislav (advisor)
This bachelor thesis deals with a professional research in the field of sleeve bearings and their diagnostic disorders. It describes the recognized methods of identification and technical diagnosis of these errors. Furthermore, it describes the features and possibilities provided by the rotor model RK4 in the simulation of sleeve bearings. Moreover, the thesis deals with the development of a laboratory task for students to demonstrate the diagnostic fault of oil whirl.
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Verification of rotor model properties for sleeve bearings
Šály, Timotej ; Hnidka, Jakub (referee) ; Klusáček, Stanislav (advisor)
This bachelor thesis deals with a professional research in the field of sleeve bearings and their diagnostic disorders. It describes the recognized methods of identification and technical diagnosis of these errors. Furthermore, it describes the features and possibilities provided by the rotor model RK4 in the simulation of sleeve bearings. Moreover, the thesis deals with the development of a laboratory task for students to demonstrate the diagnostic fault of oil whirl.
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Near-field acoustical holography methods in LabVIEW environment
Majvald, František ; Hnidka,, Jakub (referee) ; Havránek, Zdeněk (advisor)
Near-field acoustical holography is a standard method for sound source visualization and localization. In this thesis, commonly used and newly published near-field acoustic holography methods are introduced and analysed. In addition, regularization methods are presented together with finding options of optimal regularization parameter. Based on theory, a LabVIEW library is built containing four implemented near-field acoustical holography algorithms and two regularization methods. To verify the correctness of implementations, a testing application has been made. This application allows testing of implemented algorithms with simulated or experimentally measured data. The correctness of implementation is verified, and algorithms are compared to each other with respect to accuracy and speed of calculation.
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|
|
Comparison of methods for identification of rolling bearing failures
Kokeš, Miroslav ; Hnidka,, Jakub (referee) ; Klusáček, Stanislav (advisor)
The aim of this master thesis is the comparison of selected methods and parameters for roller bearings diagnostics. Selected statistical parameters are kurtosis, crest factor, and parameter K(t). The other selected methods are envelope analysis, cepstral analysis, and ACEP method. These methods are implemented in LabVIEW software and compared based on noise resistance, computation speed, and overall capability of identifying roller bearing faults.
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