Non-contact systems for monitoring blade vibrations of steam turbines

0383029 - ÚT 2013 RIV BE eng C - Konferenční příspěvek (zahraniční konf.)
Procházka, Pavel - Vaněk, František
Non-contact systems for monitoring blade vibrations of steam turbines.
Proceedings of ISMA2012 - USD2012. Leuven: KU Leuven, 2012 - (Sas, P.; Moens, D.; Jonckheere, S.), s. 3359-3372. ISBN 9789073802896.
[ISMA2012-USD2012. Leuven (BE), 17.09.2012-19.09.2012]
Grant CEP: GA TA ČR TA02020728
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: steam turbines * blade vibrations * non-contact sensors
Kód oboru RIV: JB - Senzory, čidla, měření a regulace

The study deals with systems and methods used for the identification of blade stress, vibration and damage in low-power stages of steam turbines. The tip-timing method based on the evaluation of time differences of blade passages in different rotor revolutions has been modified and improved to provide more precise and reliable results. A new approach to the analysis of the amplitude and time differences of impulse signals generated by a blade passage has been applied. Principles of non-contact sensors of blade passages based on measuring deflections or velocity components are described and compared, including up-to-date magneto-resistive sensors. Selection of a sensor type is focused on a demanded accuracy of the blade position measurements with respect to the used method.
Trvalý link: http://hdl.handle.net/11104/0213099