Measurement and evaluation of shaft torsional vibrations to reveal the rotating blades excitation sources

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43931903" target="_blank" >RIV/49777513:23520/17:43931903 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Measurement and evaluation of shaft torsional vibrations to reveal the rotating blades excitation sources

Popis výsledku v původním jazyce

The monitoring and diagnostics of steam turbine blades is a very important task for machine safety and reliability. The most common sources of blades excitation are centrifugal and aerodynamic forces. Rotor torsional vibrations can also excite rotor blades and lead to their failure. Negative sequence currents that occur due to unbalance of angular currents in electrical grid may affect turbine generator and excite rotor at twice the rotational frequency. If the blade natural frequencies are close to 2X, the amplitudes of blades vibration can become excessively large due to resonance. One possibility of monitoring of this state is the measurement and correct evaluation of shaft torsional vibrations. The article describes the methodology of shaft torsional vibrations measurement. The measurement chain consists of optical probes, zebra tapes and electronic device with 100 MHz sampling rate for data measurement and thresholding. A signal processing technique based on evaluation of instantaneous angular speed is also described in this paper. Finally, the results of torsional vibrations measurement and evaluation of TG are presented and discussed.

Název v anglickém jazyce

Measurement and evaluation of shaft torsional vibrations to reveal the rotating blades excitation sources

Popis výsledku anglicky

The monitoring and diagnostics of steam turbine blades is a very important task for machine safety and reliability. The most common sources of blades excitation are centrifugal and aerodynamic forces. Rotor torsional vibrations can also excite rotor blades and lead to their failure. Negative sequence currents that occur due to unbalance of angular currents in electrical grid may affect turbine generator and excite rotor at twice the rotational frequency. If the blade natural frequencies are close to 2X, the amplitudes of blades vibration can become excessively large due to resonance. One possibility of monitoring of this state is the measurement and correct evaluation of shaft torsional vibrations. The article describes the methodology of shaft torsional vibrations measurement. The measurement chain consists of optical probes, zebra tapes and electronic device with 100 MHz sampling rate for data measurement and thresholding. A signal processing technique based on evaluation of instantaneous angular speed is also described in this paper. Finally, the results of torsional vibrations measurement and evaluation of TG are presented and discussed.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20704 - Energy and fuels

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

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

First World Congress on Condition Monitoring – WCCM 2017

ISBN

978-0-903132-64-0

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

10

Strana od-do

1-10

Název nakladatele

The British Institute for Non-Destructive Testing

Místo vydání

Northampton, UK

Místo konání akce

ILEC Conference Center London

Datum konání akce

12. 6. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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