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2021 | OriginalPaper | Buchkapitel

A Method for Online Monitoring of Rotor–Stator Rub in Steam Turbines

verfasst von : J. Liska, J. Jakl

Erschienen in: Advances in Condition Monitoring and Structural Health Monitoring

Verlag: Springer Singapore

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Abstract

In recent years, the operation of steam turbines has been associated with the occurrence of rotor–stator rub. This is because the clearances in the turbine flow paths decrease in an effort to increase the turbine efficiency. At present, detailed rubbing diagnostics is implemented as offline analysis of measured data. The detection of the rotor–stator rub is based on analysis of vibration signals in time domain when a machine operator monitors the overall level of vibration or the vector of rotation frequency contained in the measured vibration signal. This paper deals with design and implementation of the system for online monitoring of rotor–stator rub implemented as the rub advanced monitoring system (RAMS), which, in addition to detection phase, provides also localization of the place of contact occurrence, based on additional knowledge of the rotor geometry. Except the contact on the shaft, the contact between the blade tips and the stator seal can also be detected and localized. The contact is in that case accompanied by periodic impacts whose frequency for example corresponds to the product of the number of swirl brakes above blade tips and the rotation frequency. With this information obtained from standard rotor vibration signals, the rotor operation can be diagnosed in more detail and, if necessary, the turbine operation can be adapted to the current situation.

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Literatur
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Zurück zum Zitat Peng Z, He Y, Lu Q, Chu F (2003) Feature extraction of the rub-impact rotor system by means of wavelet analysis. J Sound Vib 259(4):1000–1010CrossRef Peng Z, He Y, Lu Q, Chu F (2003) Feature extraction of the rub-impact rotor system by means of wavelet analysis. J Sound Vib 259(4):1000–1010CrossRef
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Zurück zum Zitat Abuzaid MA, Eleshaky ME, Zedan MG (2009) Effect of partial rotor-to-stator rub on shaft vibration. J Mech Sci Technol 23:170–182CrossRef Abuzaid MA, Eleshaky ME, Zedan MG (2009) Effect of partial rotor-to-stator rub on shaft vibration. J Mech Sci Technol 23:170–182CrossRef
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Zurück zum Zitat Hall LD, Mba D (2004) Diagnosis of continuous rotor-stator rubbing in large scale turbine units using acoustic emissions. Ultrasonics 41:765–773CrossRef Hall LD, Mba D (2004) Diagnosis of continuous rotor-stator rubbing in large scale turbine units using acoustic emissions. Ultrasonics 41:765–773CrossRef
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Zurück zum Zitat Goldman P, Muszynska A (1999) Application of full spectrum to rotating machinery diagnostics. Orbit 20(1):17–21 Goldman P, Muszynska A (1999) Application of full spectrum to rotating machinery diagnostics. Orbit 20(1):17–21
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Zurück zum Zitat Liska J, Jakl J, Cerny V (2011) The use of time-frequency methods in rotor/stator impact-rubbing detection. In: Proceedings of Asme 2011 international design engineering technical conferences & computers and information in engineering conference, IDETC/CIE 2011, Washington, DC, pp 1–10 Liska J, Jakl J, Cerny V (2011) The use of time-frequency methods in rotor/stator impact-rubbing detection. In: Proceedings of Asme 2011 international design engineering technical conferences & computers and information in engineering conference, IDETC/CIE 2011, Washington, DC, pp 1–10
10.
Zurück zum Zitat Liska J, Jakl J, Janecek E (2012) Steam turbine rotor/stator impact and rubbing detection. In: Proceedings of 9th international conference on condition monitoring and machinery failure prevention technologies, London, pp 1–12 Liska J, Jakl J, Janecek E (2012) Steam turbine rotor/stator impact and rubbing detection. In: Proceedings of 9th international conference on condition monitoring and machinery failure prevention technologies, London, pp 1–12
11.
Zurück zum Zitat Liska J, Cerny V A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine. US patent US9903787B2 Liska J, Cerny V A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine. US patent US9903787B2
12.
Zurück zum Zitat Liska J, Cerny V A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine. European patent EP2746541 Liska J, Cerny V A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine. European patent EP2746541
Metadaten
Titel
A Method for Online Monitoring of Rotor–Stator Rub in Steam Turbines
verfasst von
J. Liska
J. Jakl
Copyright-Jahr
2021
Verlag
Springer Singapore
DOI
https://doi.org/10.1007/978-981-15-9199-0_38

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