US 12,117,364 B2
Method for monitoring an epicyclic gear train by progressive mechanical wave measurement
Josselin Xavier Coupard, Moissy-Cramayel (FR); Valentin Francis Joël Facquet, Moissy-Cramayel (FR); and Julien Christian Pascal Griffaton, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/753,376
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Sep. 4, 2020, PCT No. PCT/FR2020/051534
§ 371(c)(1), (2) Date Mar. 1, 2022,
PCT Pub. No. WO2021/044106, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 1909851 (FR), filed on Sep. 6, 2019.
Prior Publication US 2022/0291086 A1, Sep. 15, 2022
Int. Cl. G01M 13/028 (2019.01); G01M 13/021 (2019.01)
CPC G01M 13/028 (2013.01) [G01M 13/021 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for monitoring an epicyclic gear train of an aircraft, the method comprising the following steps of:
generating a progressive mechanical wave in an epicyclic gear train, wherein the epicyclic gear train includes two coaxially mounted first toothed wheels and at least one second toothed wheel meshing with the two first toothed wheels,
acquiring by a mechanical wave sensor, at a predetermined sampling frequency, first values of a signal formed by the progressive mechanical wave generated in the epicyclic gear train, said first values forming primary mechanical wave data;
measuring by a speed rotation sensor, at a plurality of successive time instants, values of a speed of rotation of at least one of the two first toothed wheels and the at least one second toothed wheel, said measured values forming primary rotation data;
from the primary rotation data, calculating by a processor values of a speed of rotation of a contact point between one first toothed wheel and the one second toothed wheel of the epicyclic gear train, said calculated values forming secondary rotation data;
from the primary mechanical wave data and the secondary rotation data, determining by the processor second values of said signal formed by the progressive mechanical wave generated in the epicyclic gear train, said second values corresponding to a regular sampling as a function of a phase of said contact point and forming secondary mechanical wave data; and
using the secondary mechanical wave data to detect an anomaly related to an operation of the epicyclic gear train.