Torque-measurement device for a turbomachine shaft

Patent metadata

Field	Value
Publication number	US-2016299019-A1
Application number	US-201415100838-A
Country	US
Kind code	A1
Filing date	Dec 2, 2014
Priority date	Dec 3, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

The present invention relates to a torque-measurement device for a turbine engine shaft ( 1 ) including a proof body ( 7 ) capable of being mounted on the shaft, characterised in that the proof body ( 7 ) forms a mounting for at least one acoustic-wave strain gauge ( 20 ) and is magnetised such as to allow the torque to be measured by magnetostrictive effect. The invention also relates to a method for calibrating the torque-measurement system including a first step of calibrating said device, the device being mounted on a shaft but outside of the engine, by applying reference torques to the shaft with the device and by establishing a rule regarding the relationship between the strain measured by said strain gauge and the actual torque applied, a step of mounting the shaft with the device inside the turbine engine together with placement of the magnetostrictive measurement system, the calibration of the first step being optionally reset with the engine stopped, and a step of establishing a calibration rule regarding the relationship between the torque measured by magnetostrictive effect and the reference torque provided by the strain gauges.

First claim

1 . Device for measuring the torque transmitted by a turbine engine shaft comprising:
a test piece which can be mounted on the shaft, said test piece being capable of being magnetized and forming a support for at least one surface acoustic wave strain gauge, means for measuring the torque by means of a magnetostrictive effect, using magnetostrictive measuring sensors which are capable of capturing a variation in the magnetic permeability of the magnetized test piece, and means for calibrating the measurement of the torque by means of a magnetostrictive effect, which are capable of establishing a calibration law between the torque measured by said measuring means and a reference torque given by said at least one strain gauge.

2 . Device according to claim 1 , the test piece of which has a tubular shape, said at least one strain gauge being fixed to the wall, in particular the interior wall, of the tubular test piece and comprises an antenna for transmitting signal which is connected to said at least one strain gauge, said tubular test piece being arranged so as to be mounted concentrically with said shaft and having two elements for fixing to the shaft, which elements are axially remote from one another.

3 . Device according to claim 2 , of which at least one of the fixing elements is a friction fixing element.

4 . Device according to claim 3 , of which at least one friction fixing element comprises a contact surface which is perpendicular to the axis of the tubular test piece.

5 . Device according to claim 2 , of which at least one of the fixing elements comprises teeth which are arranged so as to cooperate with the teeth on the shaft which have a complementary shape.

6 . Device according to claim 2 , the antenna of which is cylindrical.

7 . Turbine engine shaft, comprising a measuring device according to claim 1 .

8 . Shaft according to claim 7 , comprising a radial flange, one end of the device being held on the shaft by bearing axially against the flange and optionally comprising a jaw tooth connection at the other end thereof.

9 . Device according to claim 1 , wherein it comprises sensors a which can be fixed on a stator part opposite the test piece for the magnetostrictive measurement, a fixed antenna which can receive the signals from said at least one strain gauge and a unit for processing the signal.

10 . Method for calibrating device for measuring the torque transmitted by a turbine engine shaft according to claim 1 , comprising:
a step of establishing a law between the strain measured by said at least one strain gauge and the actual torque applied outside the shaft, a step of mounting the shaft with the device on the shaft, and a step of establishing a calibration law between the torque measured by means of a magnetostrictive effect and the reference torque given by said at least one strain gauge.

Assignees

• Snecma

Inventors

• Curlier Augustin
• LA GOUELLEC Gilles
• Kunakovitch Alexis

Classifications

• G01L25/003 Primary

  for measuring torque · CPC title

• G01L3/104 Primary

  involving permanent magnets · CPC title

• G01L1/165

  with acoustic surface waves · CPC title

• G01L3/102

  involving magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title