FR3098587B1 - Method and system for detecting open circuits of accelerometers by phase noise - Google Patents

Method and system for detecting open circuits of accelerometers by phase noise Download PDF

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Publication number
FR3098587B1
FR3098587B1 FR1907632A FR1907632A FR3098587B1 FR 3098587 B1 FR3098587 B1 FR 3098587B1 FR 1907632 A FR1907632 A FR 1907632A FR 1907632 A FR1907632 A FR 1907632A FR 3098587 B1 FR3098587 B1 FR 3098587B1
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Prior art keywords
amplitude
threshold
phase
circuit
accelerometers
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FR1907632A
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French (fr)
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FR3098587A1 (en
Inventor
François Maurice Marcel Demaison
Thomas Louis Gaston Dumargue
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Safran Aircraft Engines SAS
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Safran Aircraft Engines SAS
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Priority to FR1907632A priority Critical patent/FR3098587B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
    • G01H1/006—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines of the rotor of turbo machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups

Abstract

Procédé et s ystème de détection des circuits ouverts des accéléromètres par le bruit de phase Procédé et système de détection d’un circuit ouvert sur un accéléromètre d’une turbomachine, comprenant, pour un régime de turbomachine, une extraction (130) de l’amplitude du signal mesuré par l’accéléromètre, un filtrage (140) du signal autour d’une fréquence dépendant dudit régime, une comparaison (170) de l’amplitude à un seuil d’amplitude, une détermination (150) de la phase associée à l’harmonique principale du signal, et une détermination (160) de la variance de la phase. Si l’amplitude est supérieure au seuil d’amplitude, le circuit est considéré fermé si ladite variance est inférieure à un premier seuil et ouvert sinon. Et, si l’amplitude est inférieure au seuil d’amplitude, ledit circuit est considéré fermé si ladite variance est inférieure à un second seuil ; sinon, ledit circuit est considéré fermé si ladite phase extraite est hors de la plage de valeurs de phase, et la détection est considérée comme incertaine et le procédé de détection est réitéré pour un nouveau régime sinon. Figure pour l’abrégé : Fig. 2.Method and system for detecting open circuits of accelerometers by phase noise Method and system for detecting an open circuit on an accelerometer of a turbomachine, comprising, for a turbomachine speed, an extraction (130) of the gas. amplitude of the signal measured by the accelerometer, filtering (140) of the signal around a frequency depending on said regime, a comparison (170) of the amplitude with an amplitude threshold, a determination (150) of the associated phase to the main harmonic of the signal, and a determination (160) of the phase variance. If the amplitude is greater than the amplitude threshold, the circuit is considered closed if said variance is less than a first threshold and open otherwise. And, if the amplitude is less than the amplitude threshold, said circuit is considered closed if said variance is less than a second threshold; otherwise, said circuit is considered closed if said extracted phase is outside the range of phase values, and the detection is considered uncertain and the detection process is repeated for a new regime otherwise. Figure for the abstract: Fig. 2.

FR1907632A 2019-07-08 2019-07-08 Method and system for detecting open circuits of accelerometers by phase noise Active FR3098587B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1907632A FR3098587B1 (en) 2019-07-08 2019-07-08 Method and system for detecting open circuits of accelerometers by phase noise

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1907632A FR3098587B1 (en) 2019-07-08 2019-07-08 Method and system for detecting open circuits of accelerometers by phase noise
FR1907632 2019-07-08

Publications (2)

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FR3098587A1 FR3098587A1 (en) 2021-01-15
FR3098587B1 true FR3098587B1 (en) 2021-06-11

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FR1907632A Active FR3098587B1 (en) 2019-07-08 2019-07-08 Method and system for detecting open circuits of accelerometers by phase noise

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0987554T3 (en) * 1998-09-15 2006-03-06 Vibro Meter Ag Measuring circuit
FR3005165B1 (en) * 2013-04-26 2015-04-24 Sagem Defense Securite DIFFERENTIAL CURRENT ACQUISITION DEVICE AND METHOD FOR CONTROLLING SUCH ACQUISITION DEVICE

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