Relative shaft vibrations calibration technique for blade monitoring

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F16%3A43929814" target="_blank" >RIV/49777513:23520/16:43929814 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.scopus.com/record/display.uri?origin=resultslist&eid=2-s2.0-85002689040" target="_blank" >https://www.scopus.com/record/display.uri?origin=resultslist&eid=2-s2.0-85002689040</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Relative shaft vibrations calibration technique for blade monitoring

Popis výsledku v původním jazyce

The diagnostics of steam turbine components is important task not only for turbine operators, but also for developers (OEM). Monitoring of blade vibrations, mainly of last stages of low pressure parts is unexceptionable. Commonly used methods are based on stress evaluation using strain gauges or blade tip-timing (BTT) method. The symptoms of blade vibrations could also be visible in signals from relative shaft vibration (SV) sensors, which are standardly installed in turbine journal bearings. With detailed signal analysis of relative shaft vibrations it was founded, that rotor vibrations don’t contain exactly components with frequencies equal to blades natural frequencies, but frequencies given by addition and subtraction of blades natural frequencies and rotational frequency. This indicates the modulation of blade natural frequencies by rotational frequency. Results of recent research indicate very good correlation between blade vibration amplitudes calculated from BTT and from shaft vibration signals. But the levels of blade vibrations in relative shaft vibration signals are lower than 1µm so the calibration of relative shaft vibrations at frequencies related to blade natural frequencies is needed. The article describes method for blade vibration calibration and also results comparison of BTT to SV calibration for two types of LSB at power station.

Název v anglickém jazyce

Relative shaft vibrations calibration technique for blade monitoring

Popis výsledku anglicky

The diagnostics of steam turbine components is important task not only for turbine operators, but also for developers (OEM). Monitoring of blade vibrations, mainly of last stages of low pressure parts is unexceptionable. Commonly used methods are based on stress evaluation using strain gauges or blade tip-timing (BTT) method. The symptoms of blade vibrations could also be visible in signals from relative shaft vibration (SV) sensors, which are standardly installed in turbine journal bearings. With detailed signal analysis of relative shaft vibrations it was founded, that rotor vibrations don’t contain exactly components with frequencies equal to blades natural frequencies, but frequencies given by addition and subtraction of blades natural frequencies and rotational frequency. This indicates the modulation of blade natural frequencies by rotational frequency. Results of recent research indicate very good correlation between blade vibration amplitudes calculated from BTT and from shaft vibration signals. But the levels of blade vibrations in relative shaft vibration signals are lower than 1µm so the calibration of relative shaft vibrations at frequencies related to blade natural frequencies is needed. The article describes method for blade vibration calibration and also results comparison of BTT to SV calibration for two types of LSB at power station.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20205 - Automation and control systems

Projekt

<a href="/cs/project/LO1506" target="_blank" >LO1506: Podpora udržitelnosti centra NTIS - Nové technologie pro informační společnost</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

The Thirteenth International Conference on Condition Monitoring and Machinery Failure Prevention Technologies CM2016 / MFPT2016

ISBN

978-1-5108-3093-6

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

11

Strana od-do

1-11

Název nakladatele

The British Institute for Non-Destructive Testing

Místo vydání

Northampton

Místo konání akce

Novotel Paris Sud Charenton, Paříž, Francie

Datum konání akce

10. 10. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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