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FR2646468A1 - Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane - Google Patents

Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane Download PDF

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Publication number
FR2646468A1
FR2646468A1 FR8905700A FR8905700A FR2646468A1 FR 2646468 A1 FR2646468 A1 FR 2646468A1 FR 8905700 A FR8905700 A FR 8905700A FR 8905700 A FR8905700 A FR 8905700A FR 2646468 A1 FR2646468 A1 FR 2646468A1
Authority
FR
France
Prior art keywords
photograph
blade
flash
turbine
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR8905700A
Other languages
French (fr)
Inventor
Alain Thomas
Philippe Camus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Holdings SA
Original Assignee
GEC Alsthom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GEC Alsthom SA filed Critical GEC Alsthom SA
Priority to FR8905700A priority Critical patent/FR2646468A1/en
Publication of FR2646468A1 publication Critical patent/FR2646468A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Method for measuring the untwist in the vanes 3 of a rotating turbomachine. Characterised in that a signal 2A is generated which is dependent on the rotational speed of the turbine. A camera 5 pointing towards a position B through which the ends of the vanes 3 pass is opened, an electronic flash 6 is triggered illuminating the said position B for a very short time with a delay which is dependent on the rotational speed of the turbine and on the position of the chosen vane 3' so that the end of the chosen vane 3' is in the position B at the moment of illumination from the electronic flash 6. The photograph 3B is developed and it is compared with the photograph 3A of the same vane end 3' taken at rest. Device making it possible to implement the method. This method is simple and reliable and makes it possible to measure the actual untwist of a given vane.

Description

Procédé de mesure du dévrillage des aubes d'une turbomachine en rotation et dispositif permettant de photographier l'extrémité de l'aube en rotation
La présente invention concerne un procédé de mesure du dévrillage des aubes d'une turbomachine en rotation.Method for measuring the twisting of the blades of a rotating turbomachine and device for photographing the end of the rotating blade
The present invention relates to a method for measuring the twisting of the blades of a rotating turbomachine.

Il est très intéressant pour le constructeur de turbomachine de pouvoir mesurer le dévrillage réel des aubes en service et de le comparer à celui calculé. It is very interesting for the turbomachine manufacturer to be able to measure the actual deflection of the blades in service and to compare it with that calculated.

Le procédé selon l'invention est caractérisé en ce qu'on génère un signal dépendant de la vitesse de rotation de la turbine. The method according to the invention is characterized in that a signal depends on the speed of rotation of the turbine.

On ouvre un appareil photographique dirigé vers une position B où passent l'extrémité des aubes, on déclenche un flash électronique éclairant ladite position B pendant un temps très court avec un retard dépendant de la vitesse de rotation de la turbine et de la position de l'aube choisie pour que ltextrémité de l'aube choisie soit dans la position B au moment de l'éclair du flasch électronique.We open a camera directed to a position B where the tip of the blades pass, we trigger an electronic flash illuminating said position B for a very short time with a delay depending on the speed of rotation of the turbine and the position of the 'vane selected so that the end of the vane selected is in position B at the time of the flash of the electronic flasch.

On développe la photographie 3B et on la compare avec une photographie 3A de la même extrémité de 1V aube prise au repos.We develop the 3B photograph and compare it with a 3A photograph of the same end of 1V dawn taken at rest.

La présente invention concerne également un dispositif pour la mise en oeuvre du procédé selon l'invention permettant de photographier l'extrémité de l'aube en mouvement. The present invention also relates to a device for implementing the method according to the invention making it possible to photograph the end of the blade in motion.

Ce dispositif simple et fiable est caractérisé en ce qu'il comporte - un capteur de vitesse, - un flash ultra-rapide, - un appareil photographique, ledit capteur de vitesse délivrant un signal de référence 2A, fonction de la vitesse de rotation de la turbine à une électronique de déclenchement, ladite électronique de déclenchement servant à commander l'ouverture et la fermeture de l'appareil photographique et à délivrer une impulsion 2D pour déclencher le flash avec un retard réglable t', ledit retard t' étant fonction d'un angle affiché b et de la vitesse de la turbine, afin que l'appareil puisse photographier ltextrémité de l'aube écartée d'un angle b par rapport.à une aube de référence dans une position A. This simple and reliable device is characterized in that it comprises - a speed sensor, - an ultra-fast flash, - a photographic camera, said speed sensor delivering a reference signal 2A, a function of the speed of rotation of the turbine with trigger electronics, said trigger electronics used to control the opening and closing of the camera and to deliver a 2D pulse to trigger the flash with an adjustable delay t ', said delay t' being a function of a displayed angle b and the speed of the turbine, so that the camera can photograph the end of the blade spaced at an angle b relative to a reference blade in a position A.

La présente invention sera mieux comprise à la lumière de la description qui va suivre dans laquelle
La figure 7 représente un dispositif selon l'invention.The present invention will be better understood in the light of the following description in which
FIG. 7 represents a device according to the invention.

La figure 2 représente schématiquement les signaux électriques nécessaires à la commande du dispositif selon la figure 1. FIG. 2 schematically represents the electrical signals necessary for controlling the device according to FIG. 1.

Les figures 3A et 3B représentent la photographie de l'aube à l'arrêt et de l'aube en mouvement. FIGS. 3A and 3B represent the photograph of the dawn at a standstill and of the dawn in motion.

Le rotor 1 de la turbomachine est muni d'aubes 3. The rotor 1 of the turbomachine is provided with blades 3.

Ce rotor 1 comporte une position de référence A correspondant à une aube de référence. Un capteur de vitesse 4 disposé à proximité du rotor 1 détecte le passage de la référence A et délivre un signal (2A) comportant une impulsion par tour du rotor. This rotor 1 has a reference position A corresponding to a reference blade. A speed sensor 4 disposed near the rotor 1 detects the passage of the reference A and delivers a signal (2A) comprising a pulse per revolution of the rotor.

Un appareil photographique 5 vise une position B de la périphérie du rotor. A camera 5 aims at a position B of the periphery of the rotor.

Cette position B est écartée d'un angle a, par rapport à la position du capteur de vitesse (sur la figure "a" a été choisi égal à 900). This position B is separated by an angle a, relative to the position of the speed sensor (in the figure "a" has been chosen equal to 900).

Un flash ultra-rapide 6 est également dirigé vers la position B. A high-speed flash 6 is also aimed at position B.

La commande du flash 6 et de l'appareil photographique 5 est réalisée par une électronique de déclenchement 7. The flash 6 and the camera 5 are controlled by trigger electronics 7.

Cette électronique 7 est alimentée par les impulsions 2A. This electronics 7 is supplied by pulses 2A.

On commande manuellement à l'aide d'un bouton 8 à deux positions l'électronique 7 pour ouvrir l'appareil photographique 5. A cet effet, un signal 2B en forme de créneau est envoyé par l'électronique 7 à l'appareil 5. The electronics 7 are manually controlled using a button 8 with two positions to open the camera 5. For this purpose, a signal 2B in the form of a slot is sent by the electronics 7 to the camera 5 .

On affiche, au moyen d'un bouton 9, un angle b qui correspond au décalage entre l'aube de référence située à la position A et l'aube 3' dont on désire photographier l'extrémité ; a peut donc varier de 0 à 3600. An angle b is displayed by means of a button 9 which corresponds to the offset between the reference vane located at position A and the vane 3 'whose end is to be photographed; a can therefore vary from 0 to 3600.

On commande ensuite la prise de la photographie en appuyant sur un bouton "prise photo" 1O, ce qui délivre un échelon de tension 2C. We then order the taking of the photograph by pressing a "photo" button 1O, which delivers a voltage step 2C.

Dans l'électronique 7, on sélectionne la première impulsion I du signal 2A qui arrive après le début du créneau 2C. On génère
a+b une impulsion J retardée par rapport à I, du temps t' égal à : 360 x t t étant l'écart entre deux impulsions du signal 2A.In the electronics 7, the first pulse I of the signal 2A which arrives after the start of the slot 2C is selected. We generate
a + b a pulse J delayed with respect to I, time t 'equal to: 360 xtt being the difference between two pulses of the signal 2A.

L'impulsion J déclenche le flash 6. Pulse J fires flash 6.

L'éclair du flash est très bref, par exemple 0,sils. Ce qui détermine le temps de pose de la photographie donc le flou. The flash flash is very short, for example 0, sils. What determines the exposure time of the photograph therefore the blur.

A 700 m/s l'extrémité de l'aube bouge de 0,35 mm pendant la pose. At 700 m / s the end of the blade moves 0.35 mm during installation.

En faisant varier le réglage de l'angle a, on fait varier t' et donc on peut choisir l'aube dont on désire photographier l'extrémité. By varying the setting of the angle a, we vary t 'and therefore we can choose the blade whose end we want to photograph.

La précision de l'électronique 7 qui calcule le temps de retard t' permet d'attendre des précisions de l'ordre de 0,1 .  The precision of the electronics 7 which calculates the delay time t 'makes it possible to wait for precisions of the order of 0.1.

Pour déterminer le dévrillage de l'aube 3', on compare une photographie 3B de l'extrémité de l'aube 3' prise en mouvement (V = n) avec une photographie de l'extrémité de la même aube à l'arrêt (V = 0). To determine the deflection of the blade 3 ', a photograph 3B of the end of the blade 3' taken in motion (V = n) is compared with a photograph of the end of the same blade when stopped ( V = 0).

De préférence les photographies 3A et 3B sont munies de repères R permettant de superposer les images et quantifier les différences de position. L'angle de dévrillage mesuré serais d = dv - do.  Preferably, the photographs 3A and 3B are provided with marks R making it possible to superimpose the images and quantify the differences in position. The measured unwinding angle would be d = dv - do.

Claims (2)

REVENDICATIONS 1/ Procédé de mesure du dévrillage des aubes (3) d'une turbomachine en rotation.1 / Method for measuring the twisting of the blades (3) of a rotating turbomachine. caractérisé en ce qu'on génère un signal (2A) dépendant de la vitesse de rotation de la turbine, on ouvre un appareil photographique (5) dirigé vers une position B où passent l'extrémité des aubes (3), on déclenche un flash électronique (6) éclairant ladite position B pendant un temps très court avec un retard dépendant de la vitesse de rotation de la turbine et de la position de l'aube choisie (3) pour que l'extrémité de l'aube choisie (3') soit dans la position B au moment de l'éclair du flash électronique (6), on développe la photographie (3B) et on la compare avec une photographie (3A) de la même extrémité de l'aube (3') prise au repos.characterized in that one generates a signal (2A) depending on the speed of rotation of the turbine, one opens a photographic camera (5) directed towards a position B where pass the end of the blades (3), one triggers a flash electronic (6) illuminating said position B for a very short time with a delay depending on the speed of rotation of the turbine and the position of the chosen blade (3) so that the end of the chosen blade (3 ' ) or in position B at the time of the flash of the electronic flash (6), the photograph (3B) is developed and compared with a photograph (3A) of the same end of the blade (3 ') taken at rest. 2/ Dispositif permettant de photographier l'extrémité d'une aube de turbomachine (3) en rotation, caractérisé en ce qu'il comporte - un capteur de vitesse (4), - un flash ultra-rapide (6), - un appareil photographique (5), ledit capteur de vitesse (4) délivrant un signal de référence (2A), fonction de la vitesse de rotation de la turbine à une électronique de déclenchement (7), ladite électronique de déclenchement (7) servant à commander l'ouverture et la fermeture de l'appareil photographique (5) et à délivrer une impulsion (2D) pour déclencher le flash (6) avec un retard réglable (t'), ledit retard (t') étant fonction d'un angle affiché (b) et de la vitesse de la turbine, afin que l'appareil (5) puisse photographier l'extrémité de l'aube (3') écartée de b par rapport à une aube de référence dans une position A. 2 / Device for photographing the end of a turbomachine blade (3) in rotation, characterized in that it comprises - a speed sensor (4), - an ultra-fast flash (6), - an apparatus photographic (5), said speed sensor (4) delivering a reference signal (2A), a function of the speed of rotation of the turbine to a trigger electronics (7), said trigger electronics (7) being used to control the opening and closing the camera (5) and delivering a pulse (2D) to trigger the flash (6) with an adjustable delay (t '), said delay (t') being a function of a displayed angle (b) and the speed of the turbine, so that the camera (5) can photograph the end of the blade (3 ′) away from b relative to a reference blade in a position A.
FR8905700A 1989-04-28 1989-04-28 Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane Pending FR2646468A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8905700A FR2646468A1 (en) 1989-04-28 1989-04-28 Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8905700A FR2646468A1 (en) 1989-04-28 1989-04-28 Method for measuring the untwist in the vanes of a rotating turbomachine and device making it possible to photograph the end of the rotating vane

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FR2646468A1 true FR2646468A1 (en) 1990-11-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102735189A (en) * 2011-04-02 2012-10-17 谭中明 Knife blade angle detection method and device thereof
FR2986864A1 (en) * 2012-02-14 2013-08-16 Snecma METHOD FOR MEASURING THE DEFORMATION OF A TURBOMACHINE BLADE DURING THE OPERATION OF THE TURBOMACHINE
US8521493B2 (en) 2010-03-19 2013-08-27 Rolls-Royce Plc Rotating blade analysis
CN106500613A (en) * 2016-10-17 2017-03-15 安徽容知日新科技股份有限公司 A kind of apparatus and system of the blade deformation of monitoring wind power plant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287677A1 (en) * 1974-10-09 1976-05-07 Siemens Ag METHOD FOR THE AUTOMATIC NON-CONTACT MEASUREMENT OF THE HEIGHT OF VANE OF MOVING TURBINES
JPS5739308A (en) * 1980-08-22 1982-03-04 Akashi Seisakusho Co Ltd Automatic measuring device for crack length
US4422737A (en) * 1981-12-14 1983-12-27 Gribanov Dmitry D Device for obtaining topographic picture of surface of rotating object
US4465367A (en) * 1981-11-03 1984-08-14 L'etat Francais Process and device for measuring and adjusting out-of-track distances of helicopter rotor blades

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287677A1 (en) * 1974-10-09 1976-05-07 Siemens Ag METHOD FOR THE AUTOMATIC NON-CONTACT MEASUREMENT OF THE HEIGHT OF VANE OF MOVING TURBINES
JPS5739308A (en) * 1980-08-22 1982-03-04 Akashi Seisakusho Co Ltd Automatic measuring device for crack length
US4465367A (en) * 1981-11-03 1984-08-14 L'etat Francais Process and device for measuring and adjusting out-of-track distances of helicopter rotor blades
US4422737A (en) * 1981-12-14 1983-12-27 Gribanov Dmitry D Device for obtaining topographic picture of surface of rotating object

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 6 No. 108 (P-123)[986] June 18, 1982; & JP-A-57 39 308 (AKASHI SEISAKUSHO K.K.) 04-03-1982 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9791311B2 (en) 2009-03-19 2017-10-17 Rolls-Royce Plc Rotating blade analysis
US8521493B2 (en) 2010-03-19 2013-08-27 Rolls-Royce Plc Rotating blade analysis
CN102735189A (en) * 2011-04-02 2012-10-17 谭中明 Knife blade angle detection method and device thereof
CN102735189B (en) * 2011-04-02 2016-04-20 谭中明 A kind of edge of a knife angle detection method and device
FR2986864A1 (en) * 2012-02-14 2013-08-16 Snecma METHOD FOR MEASURING THE DEFORMATION OF A TURBOMACHINE BLADE DURING THE OPERATION OF THE TURBOMACHINE
US9366599B2 (en) 2012-02-14 2016-06-14 Snecma Method for measuring the deformation of a turbo-machine blade during operation of the turbo-machine
CN106500613A (en) * 2016-10-17 2017-03-15 安徽容知日新科技股份有限公司 A kind of apparatus and system of the blade deformation of monitoring wind power plant
CN106500613B (en) * 2016-10-17 2018-12-18 合肥科博软件技术有限公司 A kind of apparatus and system for the blade deformation monitoring wind power plant

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