Browsing by Subject "monitorowanie stanu technicznego"

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Access status: Open Access ,
A new vibroacoustic method for shaft crack detection
(Wydawnictwa AGH, 2007) Gosiewski, Zdzisław; Sawicki, Jerzy Teodor
Various excitation techniques have been developed to extract information on dynamic state of rotating machinery. This paper will address the effectiveness of selected excitations and analysed signals towards health monitoring of rotating machines from the shaft crack point of view. The computer simulation study is based on the uncracked and cracked Jeffcott rotor models and the efficiency of the selected approaches is examined. As the excitation we have considered the rotor unbalance, additional harmonic forces, and input conditions. The combined resonances as diagnostic indicators of the cracked shaft are good seen in the total frequency spectrum in the case when we consider the difference between the spectra of cracked and uncracked shaft. We have also introduced a new model of the rotor which allows us to use different method of signal processing for the crack detection and the evaluation of its deep. So more, in such model we can take into account the number of excitation planes and directions of the applied forces, the choice of the analysed signals (e.g. transient, steady-state).
Access status: Restricted ,
Analiza metod diagnostycznych transformatorów elektroenergetycznych
(Data obrony: 2021-03-26) Jarosz, Damian Jakub
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej