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Use of Vibrodiagnostics in Forensic Engineering
Záleská, Veronika ; Bradáč, Albert (referee) ; Panáček, Vladimír (advisor)
This thesis deals with the measurement and evaluation of vibration on selected parts of car. Part of the work is devoted to the theory of vibration and noise, which includes, among others, presentations of common disorders of machine parts in terms of vibration. In the practical part of the work were performed out measurements described here and the results analyzed. Last part is in short devoted to the possibilities of using a similar measurement in forensic engineering.
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Vibrodiagnostic system
Bortlík, Pavel ; Čala, Martin (referee) ; Beneš, Petr (advisor)
Thesis discusses bearings failure detection that is manifesting with increased levels of vibration and acoustic emission. The first part of my work gives introduction to common disorders arising on bearings during operation and negative effects on the bearing condition. Further the thesis makes the reader familiar with the terms of vibration and acoustic emission. The work includes a description of available methods for signal evaluation of vibration and acoustic emissions in order to diagnose the state of the bearings in the domains of time and frequency. In the practical part is explained the vibrodiagnostic concept with focus on bearing endurance test. Part of this practical test is a balance sheet for hardware with marginal parametres and a software description. The work is complemented with sorted database of processed topics from the magazine Orbit Bentley Nevada.
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Study of fatigue life of roller bearings type 6204 -2Z
Poláček, Vojtěch ; Svoboda, Petr (referee) ; Klapka, Milan (advisor)
This bachelor thesis deals with the basic description of produced by fatigue failure of ball bearings. In the paper there is a description of basic diagnostic methods of machine parts. Following there is a study of vibration, their recording and the evaluation concerning bearing lifetime. The aim of the experimental part of the paper is to check the functionality and suitability od the VDT2000 analyzer and VDT Control Center software, both made by company VidiTech, s.r.o. together with the SA67 laboratory experimental stations owned by the Department of Design at Faculty of Mechanical Engineering, which were used for examining the 6204-2Z bearings. The aim of the lifespan exam is to confirm the reliability of the bearing failure warning by the analyzer and to assess the ability to record the first stages of bearing damage.
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Present State of Vibration-diagnostics
Hamplová, Veronika ; Vdoleček, František (referee) ; Zuth, Daniel (advisor)
This bachelor’s thesis is interested in new trends in vibrodiagnosis. There are described and compared properties of present-day measuring instruments and sensors. The thesis shows the newest trends and progress in the wireless transmission, minimisation and better accuracy of sensors. Then, there are described portable instruments, where progress has been registered in two fields, minimisation and better accuracy.
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Vibration diagnostics of bearings
Navrátil, Pavel ; Mazal, Pavel (referee) ; Klapka, Milan (advisor)
This bachelor’s thesis introduces the basic principles of vibrodiagnostic methods and their importance for individual fase of bearing’s damage. The selected methods studied are: acoustic emission, SPM (shock pulse method), SEE (spectral emission energy), envelope method, High frequency emission, Crest factor, Kurtosis factor and special method for slow-motion machines Adash Compressed Time.
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