A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43932190" target="_blank" >RIV/49777513:23520/17:43932190 - isvavai.cz</a>

Result on the web

<a href="https://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20140625&DB=&locale=en_EP&CC=EP&NR=2746541A2&KC=A2&ND=4#" target="_blank" >https://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20140625&DB=&locale=en_EP&CC=EP&NR=2746541A2&KC=A2&ND=4#</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

A method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine

Original language description

The invention relates to a method of detecting and localizing partial rotor-stator rubbing during the operation of a turbine, in which the rotor (1) of the turbine is monitored by means of at least one pair of sensors (3, 30, 4, 40) of the rotor vibrations arranged in one plane of measuring (330, 440) perpendicular to the axis of the rotor (1) and by at least one pair of sensors of the absolute vibrations of the bearings (2, 20). When using this method of processing, synchronically digitalized signals of the sensors (3, 30, 4, 40) of rotor vibrations, first the arithmetic mean of the individual harmonic bands in full spectrum in the frequency domain is calculated, by which means the information about the subharmonic components and their multiples in the full spectrum of these signals is transfered into the frequency band -1 X to 1 X (where X indicates the rotational frequency of the rotor (1)), at the same time is by the calculation of the median estimated the level of the signal noise, with which individual frequency bands of the full spectrum are encumbered, and which is subtracted from the amplitudes in the individual frequency bands of full spectrum of the signals of the sensors. Thus normalized accumulated full spectrum of the signals of the sensors of rotor vibrations is created, in which, subsequently, the amplitude of the predetermined subharmonic component/components of the signals of rotor vibrations is compared with the amplitudes of the frequency components in its proximity determined by the Fourier transform or by approximation with the Fourier series. Simultaneously, the presence of the monitored subharmonic component of the signals of the rotor vibrations in the spectrum of these signals is deduced, on the basis of which subsequently the occurrence of rotor-stator rubbing is deduced. In case of the rubbing occurrence the place/places of the turbine where it takes place is further localized.

Czech name

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Czech description

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Type

P - Patent

CEP classification

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OECD FORD branch

20205 - Automation and control systems

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2017

Confidentiality

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

Patent/design ID

EP2746541

Publisher

EPO_1 -

Publisher name

European Patent Office

Place of publication

Munich, The Hague, Berlin, Vienna, Brussels

Publication country

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Date of acceptance

Jul 19, 2017

Owner name

Doosan Škoda Power s.r.o., Západočeská univerzita v Plzni

Method of use

A - Výsledek využívá pouze poskytovatel

Usage type

A - K využití výsledku jiným subjektem je vždy nutné nabytí licence