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Analysis of dynamic properties of pneumatic actuator
Hrivňák, Ján ; Žatko, Miroslav (referee) ; Malenovský, Eduard (advisor)
This thesis deas with dynamic analysis of pneumatic actuator which is used as regulation mechanis of turbochargers with Variable Nozzle Turbine (VNT) technology. The first part of work is focused on experimental modeling which goal is obtaining Frequency Response Function on specify frequency range by Frequency Response Function Analysis – FRFA. Dominant vibrations of pneumatic actuator active parts is expected on this specify frequency range. Results of experimental modeling will be used for gaining input parameters for numerical computation as well. The second part deal with Pre-Stressed Modal Analysis and subsequently Harmonic analysis. Obtained results with numerical and experimental analysis will be compared. This part of diploma thesis is solved in programmatic environment ANSYS Workbench.
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Creation of Modal Parameter Estimation Application for Experimental Modal Analysis
Ondra, Václav ; Žatko, Miroslav (referee) ; Lošák, Petr (advisor)
The aim of this diploma thesis is a creation of modal parameter estimation application. Modal properties (natural frequencies, damping factors and mode shapes) are used in many dynamics analysis and their accurate determination is very important therefore the modal parameter estimation is one of the most significant part of the experimental modal analysis. Many methods have been developed for modal parameter estimation, each of them with different assumptions and with different accuracy. In the beginning of this thesis, a theory connected with modal analysis and a theory which is necessary for understanding to presented modal parameter methods are given. Then four different modal parameter estimation methods are presented - Peak Picking, Circle Fit, Least Square method and Eigensystem Realization Algorithm. The application for the modal parameter estimation is the output of this diploma thesis. In addition, the application allows performing all experimental modal analysis such as estimation of frequency response functions, animation of the found mode shapes, different kinds of comparison etc. In the conclusion, three structures are shown on which the application and modal parameter estimation methods were tested.
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Rolling Analysis of Turbocharger Pin Roller
Pazour, Martin ; Žatko, Miroslav (referee) ; Novotný, Pavel (advisor)
The subject of the diploma thesis is a description of movement of a roller which is a part of turbocharger. The diploma thesis is created in cooperation of the research department of Honeywell in Brno. The thesis consists of review concerning operating of turbochargers and possibilities of solving contact problems. Then static and dynamic conditions in contact are treated in the following part. Contact pressures are generated using numerical simulation in Ansys software. In the conclusion sizes and coefficients of friction which are recommended as the most suitable to achieve minimal wear of the components in contact.
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Computational analysis the state of stress of turbine blade
Klement, Jan ; Žatko, Miroslav (referee) ; Malenovský, Eduard (advisor)
This diploma thesis continues to the Ing. Damborský work and deals with strain-stress and dynamic analysis of the steam turbine blade. This blade is part of the last row of low pressure level of steam turbine. Computational analysis has been performed in first part using FEM. After that follows a modal analysis for the blade without residual stress as well as for the blade affected by heat treatment. Main goal is to obtain whether the state of stress is in the crack initiation area is influenced by thermal treatment. This problem was solved by computational simulation in commercial software Ansys 11.0.
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Computational analysis of the dynamic behavior of the thrust bearings
Žatko, Miroslav ; Kos, Pavel (referee) ; Malenovský, Eduard (advisor)
This master´s thesis solves the problem of stationary viscous flow of incompressible fluids in thin layers of fluid film lubrication in fixed pad thrust bearings. The parametric computational model of oil domain was created for investigation the distribution of pressure, velocity and thermal fields together with the determination of the basic parameters as axial force, heating up and friction loss. Subsequently this model was applied for investigation influence of uneven bearing clearance. The problem task was solved by final volume method in Ansys CFX 12.0 software.
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Classification of wear relevant duty cycles of turbocharger validation
Kovaříková, Lucie ; Žatko, Miroslav (referee) ; Lošák, Petr (advisor)
Tato bakalářská práce se zabývá shromážděním dat z testů pracovního cyklu motoru, jejich kontrolou a určením kritérií třídění. Dále pak návrhem a vyhodnocením metodiky charakterizace cyklů zatížení, zaměřených na očekávané výsledné opotřebení kinematických komponent turbodmychadla. Vyhodnocení a kontrola dat jsou provedeny pomocí dvou nástrojů - Python a Matlab. Výstupem této práce jsou dvě navržené metodiky zpracování pracovních cyklů na základě zpracovaných dat - obecné zpracování dat pracovního cyklu a analýza pracovního cyklu, včetně polohy aktuátoru.
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Deformation measurement of turbocharger nozzle ring under temperature load
Kovářová, Lucie ; Žatko, Miroslav (referee) ; Dlugoš, Jozef (advisor)
The thesis is about deformation measurement of the nozzle ring in variable nozzle turbine mechanism under temperature load. In the first part, there is a brief description of the turbocharger. In the second part, methods of deformation measurement are mentioned there. The main part of the thesis includes component testing of selected measuring methods and their application for measuring deformation of the nozzle ring on the turbocharger. Test is done on a gas stand which simulates the thermal load conditions of the turbocharger, same which is exposed to on the engine.
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Classification of wear relevant duty cycles of turbocharger validation
Kovaříková, Lucie ; Žatko, Miroslav (referee) ; Lošák, Petr (advisor)
Tato bakalářská práce se zabývá shromážděním dat z testů pracovního cyklu motoru, jejich kontrolou a určením kritérií třídění. Dále pak návrhem a vyhodnocením metodiky charakterizace cyklů zatížení, zaměřených na očekávané výsledné opotřebení kinematických komponent turbodmychadla. Vyhodnocení a kontrola dat jsou provedeny pomocí dvou nástrojů - Python a Matlab. Výstupem této práce jsou dvě navržené metodiky zpracování pracovních cyklů na základě zpracovaných dat - obecné zpracování dat pracovního cyklu a analýza pracovního cyklu, včetně polohy aktuátoru.
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Deformation measurement of turbocharger nozzle ring under temperature load
Kovářová, Lucie ; Žatko, Miroslav (referee) ; Dlugoš, Jozef (advisor)
The thesis is about deformation measurement of the nozzle ring in variable nozzle turbine mechanism under temperature load. In the first part, there is a brief description of the turbocharger. In the second part, methods of deformation measurement are mentioned there. The main part of the thesis includes component testing of selected measuring methods and their application for measuring deformation of the nozzle ring on the turbocharger. Test is done on a gas stand which simulates the thermal load conditions of the turbocharger, same which is exposed to on the engine.
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