A method for monitoring a servo-control loop (3) of an actuator system (2) for actuating variable-geometry components of a turbojet, said method comprising: an estimation step of estimating a plurality of monitoring parameters from operating data of the servo-control loop (2);an evaluation step of e
A method for monitoring a servo-control loop (3) of an actuator system (2) for actuating variable-geometry components of a turbojet, said method comprising: an estimation step of estimating a plurality of monitoring parameters from operating data of the servo-control loop (2);an evaluation step of evaluating a plurality of indicators from the monitoring parameters;an evaluation step for evaluating at least one signature matrix, each signature matrix being representative of the values of at least some of the indicators; anda detection and location step of detecting and locating a degradation affecting the servo-control loop as a function of said at least one signature matrix.
대표청구항▼
1. A monitoring method for monitoring a servo-control loop (3) of an actuator system (2) for actuating variable-geometry components of a turbojet, the actuator system (2) comprising at least a servovalve (25), and first and second actuators (21, 22), said method comprising: an estimation step E20 of
1. A monitoring method for monitoring a servo-control loop (3) of an actuator system (2) for actuating variable-geometry components of a turbojet, the actuator system (2) comprising at least a servovalve (25), and first and second actuators (21, 22), said method comprising: an estimation step E20 of estimating a plurality of monitoring parameters m1-m17 from operating data d4-d14 of the servo-control loop (3);an evaluation step E30 of evaluating a plurality of indicators i_EVS, i_EVA, i_EVB, i_CID, i_CINT, i_EPA, i_EPB, i_SOMA, i_SOMB, and i_EWRAP from the monitoring parameters;an evaluation step E40 for evaluating at least one signature matrix, each signature matrix being representative of the values of at least some of the indicators; anda detection and location step E50 of detecting and locating a degradation affecting the servo-control loop as a function of said at least one signature matrix;wherein, during the estimation step E20, an estimate is made of a plurality of parameters selected from at least one of the following categories:a category of parameters representative of positions VSV1, VSV2, VSVsel of the actuators (21, 22);a category of parameters representative of coefficients of autoregressive models used for predicting actuator positions as a function of a control current iCMD of the servovalve (25); anda category of parameters representative of the control current iCMD of the servovalve (25) or an integral current of the servo-control loop (3). 2. A monitoring method according to claim 1, wherein at least one of said parameters m4-m7 is estimated from an autoregressive model depending on at least one exogenous variable d1-d3 selected from: air pressure of a combustion chamber of the turbojet;metered fuel flow rate through at least one injector of the combustion chamber of the turbojet; andspeed of rotation of a high-pressure shaft of the turbojet. 3. A monitoring method according to claim 1, wherein the category of parameters representative of positions of the actuators (21, 22) comprises at least one of the following parameters: a parameter m1 representative of a measured instantaneous position VSV1 of the first actuator (21);a parameter m2 representative of a measured instantaneous position VSV2 of the second actuator (22);a parameter m6 representative of a predicted position of the first actuator (21);a parameter m7 representative of a predicted position of the second actuator (22); anda parameter m5 representative of a predicted overall position of the actuator. 4. A monitoring method according to claim 3, wherein the plurality of indicators comprises: an indicator i_EVS representing the normalized mean square difference between the parameter m5 representative of the predicted overall position of the actuator and an instantaneous overall position VSVsel of the actuators (21, 22);an indicator i_EVA representing the normalized mean square difference between the parameter m1 representative of a measured instantaneous position VSV1 of the first actuator (21) and the parameter m6 representative of a predicted position of the first actuator;an indicator i_EVB representing the normalized mean square difference between the parameter m2 representative of a measured instantaneous position VSV2 of the second actuator (22) and the parameter m7 representative of a predicted position of the second actuator;an indicator i_CID determined as a function of a parameter m15 representative of the mean control current of the servovalve (25), as normalized by a parameter m14 determined as a function of a reference control current; andan indicator i_CINT determined as a function of a parameter m17 representative of the mean integral current of the servo-control loop (3), normalized by a parameter m16 representative of a reference integral current. 5. A monitoring method according to claim 3, wherein the positions of the first and second actuators, respectively, are measured by position sensors comprising secondary windings, the rms voltages across the secondary windings depending on the positions of the actuators, with the plurality of indicators comprising: an indicator i_EPA representative of a prediction error for the position of the first actuator (21);an indicator i_EPB representative of a prediction error for the position of the second actuator (22);an indicator i_SOMA determined as a function of a parameter m9 representing a mean value of the sum of the rms voltages V23_EA and V23_EB of the secondary windings of the position sensors of the first actuator (21), normalized by a parameter m8 representative of a reference mean position for the first actuator (21);an indicator i_SOMB determined as a function of a parameter m11 representing a mean value of the sum of the rms voltages V24_EA and V24_EB of the secondary windings of the position sensors of the second actuator (22), normalized by a parameter m10 representative of a reference mean position for the second actuator (22); andan indicator i_EWRAP representative of the mean difference m12, m13 existing between the control current iCMD of the servovalve (25) and a return current as actually measured. 6. A monitoring method according to claim 1, wherein the actuator system is a system for actuating variable-geometry components selected from: positions of a bleed valve for a turbojet compressor;a fuel flow rate; andclearances at the blade tips of a high-pressure or low-pressure turbine. 7. A non-transitory recording medium readable by a computer and having recorded thereon a computer program including instructions for executing steps of a monitoring method according to claim 1. 8. A device for monitoring a servo-control loop (3) of an actuator system (2) for actuating variable-geometry components of a turbojet, the actuator system (2) including at least a servovalve (25), and first and second actuators (21, 22), said device comprising: estimator means for estimating a plurality of monitoring parameters m1-m17 from operating data d4-d14 of the servo-control loop (3);evaluation means for evaluating a plurality of indicators i_EVS, i_EVA, i_EVB, i_CID, i_CINT, i_EPA, i_EPB, i_SOMA, i_SOMB, and i_EWRAP from the monitoring parameters;evaluation means for evaluating at least one signature matrix, each signature matrix being representative of the values of at least some of the indicators; anddetection and location means for detecting and locating a degradation affecting the servo-control loop as a function of said at least one signature matrix;wherein the estimator means are configured to estimate a plurality of parameters selected from at least one of the following categories:a category of parameters representative of positions VSV1, VSV2, VSVsel of the actuators (21, 22);a category of parameters representative of coefficients of autoregressive models used for predicting actuator positions as a function of a control current iCMD of the servovalve (25); anda category of parameters representative of the control current iCMD of the servovalve (25) or an integral current of the servo-control loop (3).
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Elbert Ralph P. ; Hafner Michael A., Fault tolerant actuation system for flight control actuators.
Aurousseau, Christian; Deldalle, Régis Michel Paul; Flandrois, Xavier; Masse, Jean-Rémi André; Sif, Aziz; Lamoureux, Benjamin Pierre, Method and a device for monitoring a servo-control loop of an actuator system for actuating variable-geometry components of a turbojet.
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