Patent ID: 9366599
Filing Date: 2016-06-14
CPC Classification: F01D,G01B,G01H,G01M,Y02T

Claim Text:
1. A method for measuring the deformation of a turbo-machine blade comprising: positioning an accelerometer onto a local point of the turbo-machine blade, the accelerometer being capable of measuring an acceleration at the local point of the turbo-machine blade along a first given measurement direction; rotating the turbo-machine blade at a first predetermined speed such that the accelerometer is subjected to a first centrifugal force having a determined direction; obtaining a first value of the first centrifugal force at the first predetermined rotation speed; measuring the first centrifugal force, by the accelerometer, at the local point of the turbo-machine blade along the first given measurement direction; rotating the turbo-machine blade at a second predetermined speed, different from the first predetermined speed, so as to cause an angular displacement of the measurement direction of the accelerometer relative to the centrifugal direction and the accelerometer is subjected to a second centrifugal force; obtaining a second value of the second centrifugal force at the second predetermined rotation speed; measuring the second centrifugal force, by the accelerometer, at the local point of the turbo-machine blade along the first given measurement direction displaced by the angular displacement; and determining the angular displacement as a function of the measured centrifugal forces at the first predetermined speed and the measured centrifugal forces at the second predetermined speed, said angular displacement corresponding to an angular deformation of the local point of the turbo-machine blade, wherein the angular displacement is determined by the following formula: in which α