Wyniki wyszukiwania - BazTech

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Przesłanki i przykład parametrycznej metody oceny stanu technicznego łopatki maszyny wirnikowej z eliminacją jej niemierzalnego otoczenia

Lindstedt P., Grądzki R.

Journal of KONBiN

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2011

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No. 1 (17)

179--194

PL

W artykule przedstawiono wyniki badań metod monitorowania stanu technicznego łopatek maszyn wirnikowych bazujących na modelach A2T12,T01 oraz φT12,T01 podczas ich użytkowania. Pierwsza metoda wykorzystująca model diagnostyczny A2T12,T01 jest w postaci ilorazu wzmocnienia amplitudowego sygnału diagnostycznego y(t) wynikającego z działania łopatki i sygnału x(t) jej otoczenia podczas zbliżania się wierzchołka łopatki do czujnika i wzmocnienia amplitudowego tych sygnałów podczas oddalania się wierzchołka łopatki od czujnika. Druga metoda bazująca na modelu diagnostycznym φT12,T01 wykorzystuje różnicę przesunięcia fazowego tychże sygnałów podczas oddalania się łopatki od czujnika i zbliżania się wierzchołka łopatki do czujnika. Przyjęte modele diagnostyczne pośrednio uwzględniają aktualne otoczenie łopatki x(t) bez konieczności jego pomiaru [13,15]. Wyniki otrzymane dla modelu φT12,T01 porównano z wynikami otrzymanymi dla modelu A2T12,T01.

EN

This paper presents tests results of methods of monitoring technical condition of turbomachine blades based on diagnostic models A2T12,T01 and φT12,T01 during their use. The first method utilizes the diagnostic model A2T12,T01 which is in the form of the amplitude amplification quotient of the diagnostic signal y(t) resulting from blade operation and the signal x(t) of its environment while the blade tip approaches the sensor and amplitude amplification of those signals while the blade tip moves away from the sensor. The second method which is based on the diagnostic model φT12,T01 utilizes the difference of phase shift of those signals when the blade moves away from the sensor and when the blade tip approaches the sensor. Adopted diagnostic models indirectly take into account present blade environment x(t) without the need to measure it [13,15]. Results obtained for the model φT12,T01 were compared with the results obtained for the model A2T12,T01. The aim of this study is to present the use of diagnostic models for diagnostics of turbomachine blades during operation without the need to measure the environmental signal.

2

Rotor blades condition monitoring method based on the elimination of the environment signal

Lindstedt P., Rokicki E., Borowczyk H., Majewski P.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

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2009

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nr 25

15-24

EN

The paper presents fundamentals of a new method for monitoring of technical condition demonstrated by blades of rotor machines during operation thereof. The method involves the diagnostic model expressed as a quotient of the amplitude amplification for the diag-nostic signal y(t) that results from the blade impact and the signal x(t) produced by the blade surrounding when the blade tip approaches the sensor, divided by the amplitude amplification of these signals when the blade tip has already passed the sensor position and moves away. The adopted diagnostic model takes account for current surrounding of the blade x(t) with no need of measurements of its parameters [12, 14, 15]. Thus, the model is sensitive to alterations of the technical condition demonstrated by the blade but very little vulnerable to variations in the blade surroundings. Consequently, the proposed method may be able to play an important role for diagnostics of rotor blades during operation thereof.

3

Application of the correlation function and Fourier transformation to evaluation of technical condition demonstrated by blades of a rotor machine during the operation process

Lindstedt P., Rokicki E., Borowczyk H.

Journal of KONES

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2009

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Vol. 16, No. 2

263-269

EN

The paper presents fundamentals of a new method for monitoring of technical condition demonstrated by blades of rotor machines during operation there of. The method involves the diagnostic model expressed as a qutient of the amplitude amplification for the diagnostic signaly (t) that results from the blade impact and the signal x(t) produced by the blade surrounding when the blade tip approaches the sensor, divided by the amplitude amplification of these signals when the blade tip has already passed the sensor position and moves away. The adopted diagnostic model takes account for current surrounding of the blade x(t) with no need of measurements of its parameters [12, 14]. Thus, the model is sensitive to alterations of the technical condition demonstrated by the blade but very little vulnerable to variations in the blade surroundings. Consequently, the proposed method may be able to play an important role for diagnostics of rotor blades during operation there of. The presented method applicable to monitoring of changes in technical condition of a blade is an innovative approach to carry out diagnostic of the blade in its natural environment with no need to measure signals from that environment.