Method and device for monitoring an aircraft engine vane wheel via balance position measurement

A device for monitoring an aircraft engine vane wheel, the device including:

• at least one sensor, each sensor being configured to acquire a time signal relative to moments when the vane wheel blades pass in front of the at least one sensor, wherein said time signal is composed of pulses, and wherein each time a top of one of the blades passes in front of the at least one sensor corresponds to a pulse in the time signal;
• and
• a processor configured to:
• determine a common flight phase of the aircraft;
• correlate at least part of the time signal with a predetermined flight phase of a set of predetermined flight phases including at least one predetermined flight phase;
• measure, for each blade, for at least one flight in a series of flights of the aircraft, and for each predetermined flight phase, and based on the time signal, a first position of interest equal to a balance position of a top of the blade, the balance position of the top of the blade being the position of a point of the blade, averaged over time;
• for each blade and for each predetermined flight phase, determine a static component of a movement of the blade, said static component corresponding to a shift in the balance position, and each static component taking into account at least one flight from said series of flights;
• and
• output first positions of interest.

A method for monitoring an aircraft engine vane wheel, which includes:

• determining, by assessment, a set of predetermined flight phases, a predetermined flight phase corresponding, for each blade, to a static pressure on the blade and to a rotational speed of this blade which induce a critical operating mode of the blade;
• acquiring at least one time signal relative to moments when the vane wheel blades pass in front of a sensor, wherein said at least one time signal is composed of pulses, and wherein each time a top of one of the blades passes in front of the sensor corresponds to a pulse in the at least one time signal;
• determining a common flight phase of the aircraft;
• for each flight in a series of flights of the aircraft, correlating at least part of the at least one time signal with a predetermined flight phase of the set of predetermined flight phases including at least one predetermined flight phase;
• for each blade, each flight of said series of aircraft flights, and for each predetermined flight phase, and based on the at least one time signal, measuring a first position of interest equal to a balance position of a top of the blade, the balance position of the top of the blade being the position of a point of the blade, averaged over time;
• and
• for each blade and for each predetermined flight phase, determining a static component of a movement of the blade, said static component corresponding to a shift in the balance position, and each static component taking into account at least one flight from said series of flights.