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Computational Models of Transmission Dynamics
Czakó, Alexander ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This bachelor thesis deals with a summary of knowledge about the computational models of transmission dynamics. Dynamics modelling has different levels of complexity. From the modal, harmonic analysis solved in the FEM, up to creating a virtual prototype in the MBS softwares. In the introduction, there are presented the basics of analytical dynamics and mechanical oscillation which are the basis of individual analysis. Vibration sources in transmission are described as well.
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Pathological consequences of hypokinesis in paraplegic patient and their identification by TVS method
Vavrová, Dominika ; Jelen, Karel (advisor) ; Čichoň, Rostislav (referee)
Thesis title: Pathological consequences of hypokinesis in paraplegic patient and their identification by TVS method The thesis focus: The focus of the thesis was to identify and classify differences of mechanical properties of axial systems between paraplegic patient and people from healthy population. Secondary focus of the thesis was to identify and classify changes of mechanical properties of axial system in paraplegic patient depending on physiotherapeutic intervention. The research methods: Three people, one paraplegic person and two healthy people were measured with TVS (Transfer Vibration Through Spine) method. Paraplegic person was measured twice, before and after one hour long physiotherapeutic intervention (PI). Healthy people were measured once, without PI. TVS method is a diagnostic apparatus that enables qualitative and quantitative classification of properties of axial skeleton and its segments. It is based on fact that velocity of mechanical waves and density of mechanical energy transmitting through axial skeleton is affected by properties of this system. Thus we were able to analyze and identify mechanical properties of measured axial systems according to differences of input and output values of acceleration on particular spinous processes. The results: When we compared frequency...
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Flat Plates Vibrations
Zajac, Roman ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The diploma thesis is focused on vibration of the planar plates. It includes the computational and experimental approaches used to determine the mode shapes and frequencies (eigenvalues) of planar plates. This paper compares the analytical, numerical and experimental results of the modal analysis specifically the free-standing rectangular planar plate. The work also encompasses forced oscillation with harmonious excitement as a continuation of the obtained results from modal analysis.
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Analysis of Powertrain Acoustic Properties
Ambróz, Richard ; Novotný, Pavel (referee) ; Dundálek, Radim (referee) ; Píštěk, Václav (advisor)
Dizertačná práca rieši problematiku analýzy akustických vlastností pohonných jednotiek. V úvodnej časti je teoretický rozbor fyzikálnych princípov vibrácií a hluku a prehľad súčasného stavu riešenia problematiky v oblasti návrhu pohonných jednotiek. Vlastná časť práce popisuje konštrukčný návrh elektrodynamického budiča vibrácií, návrh hodnotenia výsledkov merania a taktiež spôsob spracovania výsledkov. Akustické vlastnosti sú hodnotené pomocou normálových rýchlostí kmitania povrchu. V závere práce sú prezentované ukážky využitia metódy v praktických príkladoch spojených s návrhom pohonnej jednotky. Celé riešenie predstavuje ucelený spôsob analýzy vhodný pre rýchle hodnotenie vplyvu konštrukčných úprav na akustické vlastnosti.
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Vibrodiagnostics of induction motor
Mašin, Dominik ; Dostál, Lukáš (referee) ; Janda, Marcel (advisor)
This thesis is dealing with measuring and evaluation of vibration signal. Vibration measurement is one of the most important operation for correct and fluent machinery service, not only from economical point of view but also because of security. Status monitoring of electric machine is a key to detect damaged parts and it is giving us an opportunity to avoid unexpected outages and failures in production. My work describes basic concepts and principals of vibration measurement. Asynchronous motor measurement and its evaluation is performed in practical part.
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Vibration system control through embedded system
Genčanský, David ; Stehlík, Jiří (referee) ; Szendiuch, Ivan (advisor)
The importance of vibration and vibration tests is increasingly relevant given th growing number of mobile electronic devices. This thesis descibes the design of control vibrating shaker table, which is an essential element for vibration testing. At the beginning is an initial look on the problematics of vibration, vibration test and influences of vibrations on electronic components, solder joints and other parts uses in microelectronics. Provides insight to the principles of vibration measurement and controlling system used in industry. The workplace is designed for testing and measuring of vibrations. The workplace designed and developed in the LabVIEW enviroment based on CompactRIO platform.
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Transmission Diagnostics
Zajac, Roman ; Janoušek, Michal (referee) ; Prokop, Aleš (advisor)
The main content of thesis is to describe the diagnostics of vibration and noise arising in the transmission device meant for cars. The document describes the different measuring instru-ments, namely the measured quantities and measuring device.
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NVH Analysis of Transmissions
Gazda, Silvester ; Zubík, Martin (referee) ; Prokop, Aleš (advisor)
This bachelor's thesis deals with the design of measuring noise and vibration of vehicle transmissions. First describes the main parts of the transmission. This is followed by a description of sources of vibration and noise, and their travel. Significant work is devoted to analysis of the frequency spectrum, of its creation and evaluation. It also includes a description of the measurement and the necessary equipment, along with a description of the basic principles of its functioning.
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Measurement of vibration in machine tools
Helienek, Matúš ; Hadaš, Zdeněk (referee) ; Vetiška, Jan (advisor)
This thesis contains general introduction to vibrodiagnostics starting with definition and classification of vibrations. Furthermore the thesis describes the theory of data acquisition of vibration intensity. This section includes also types of sensors, which are used for vibration measuring. Practical part deals with measurement as well as evaluation of cutting process.
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