US 12,379,332 B2
Blade
Yann Didier Simon Marchal, Moissy Cramayel (FR); Antonin Branteghem, Moissy Cramayel (FR); and Julien Paul Schneider-Die-Gross, Moissy Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/923,100
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed May 4, 2021, PCT No. PCT/FR2021/050766
§ 371(c)(1), (2) Date Nov. 3, 2022,
PCT Pub. No. WO2021/224573, PCT Pub. Date Nov. 11, 2021.
Claims priority of application No. 2004386 (FR), filed on May 4, 2020.
Prior Publication US 2023/0175986 A1, Jun. 8, 2023
Int. Cl. G01N 23/044 (2018.01); B29C 70/48 (2006.01); B29C 70/54 (2006.01); B29L 31/08 (2006.01); G01N 23/083 (2018.01)
CPC G01N 23/044 (2018.02) [B29C 70/541 (2013.01); G01N 23/083 (2013.01); B29C 70/48 (2013.01); B29L 2031/082 (2013.01); G01N 2223/04 (2013.01); G01N 2223/419 (2013.01); G01N 2223/63 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for checking the positioning of a fibrous preform in a blade, the method comprising:
acquiring two-dimensional (2D) tomographic projections of a blade by an imaging system comprising an X-ray source, each projection being acquired at a given orientation of the X-ray source relative to the blade, the blade having been obtained by injection of a resin into a mold having the shape of a blade and in which a preform has been placed, the blade extending in an orthonormal blade reference frame X, Y, Z, the blade comprising a blade root extending longitudinally along an axis X, an airfoil extending from the blade root along an axis Z, the blade having a thickness defined along an axis Y, the preform comprising glass tracers positioned on the surface of the preform, the center of the tracers defining a neutral fiber located at a height along the axis Z along the direction defined by the axis X;
accumulating the 2D projections along the direction of the axis Y so as to obtain a 2D image accumulated along the directions X and Z;
determining, for each pixel column defined along the direction of the axis Z, a profile of grayscales;
processing each of the profiles obtained so as to locate the position in Z of the neutral fiber along the direction of the axis X.