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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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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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Evaluation of measurements with the system VDS-UT on 5th Jan. 2010 at TG2 ETE, Z 1450/10
Procházka, Pavel ; Čertík, P.
The report presents results of the measurements with the contactless vibrodiagnostic system VDS-UT on the third stages of the low-pressure parts NT1 and NT3 of the turbine TG2 at the power plant Temelín during a short shut-down of the second block from the 5th to 6th Jan 2010. Observed phenomena of the blades with higher amplitudes of vibrations are discussed. Vibrations of blades in the monitored period are compared with the long-term measurements in November 1st-11th 2009 as well as with the turbine start-up on 15th July 2009.
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Operational measurement of blade vibrations with the system VDS-UT at TG2 ETE, Z 1449/10
Procházka, Pavel ; Vaněk, František
The results of the analysis of long-term measurements of blade vibrations of third stages of rotors NT1 and NT3 of the turbine TG2 ETE are summarized in the report. Data belonging to the period from 1st to 11th Nov. 2009, when the turbine worked without interruption at full power, were analysed in greater detail for both rotors. Trends of blade vibrations were observed and the maximum and minimum amplitudes of the time differences of all blades were assessed. Extended analysis of data from several periods in 2009, when the turbine TG2 was approaching the operational speed and power, are discussed and presented. In the conclusion, comprehensively discussed results of the analyses of all periods are presented and further development of the vibrodiagnostic system is suggested for understanding phenomena taking place under the turbine TG2 ETE operation.
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Design, realization and test operation of the vibrodiagnostic system VDS-UT at TG2 ETE system, Z1448/10
Procházka, Pavel ; Vaněk, František
The results of the development and realization of the contactless vibrodiagnostic system VDS-UT for monitoring of blade vibrations of the third blade row in the steam turbine TG2 at the power plant Temelín are described. The report deals with the concept and mathematical model of a system based on the method of time differences. The results of the development of magneto-resistive pick-ups sensing the position of the rotor and blades are summarized. The principle methods of data evaluation are discussed, which became the basis for the elaboration of programs for data analysis and on-line display of instantaneous information about the vibration of turbine blades. The results of measurements obtained by starting-up the turbine TG2 after a downtime are involved and analysed.
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