Centre National De La Recherche Scientifique

Snecma

Safran

Benjamin Samson

Wouter Balk

Jean-Pierre Lombard

Michael Atlan

Sebastien Pautard

Benjamin Kiener-Calvet

Frederic Rogues

The invention relates to a digital holography method for detecting the vibration amplitude of an object () having a vibration frequency &#x3c9;, comprising: generating object illumination waves (W) and reference waves (W); acquiring interferograms between the reference wave (W) and a signal wave (W) by means of a bandwidth &#x3c9; s detector (), the reference wave comprising two components E, Eof frequencies &#x3c9;, &#x3c9;that are respectively staggered in relation to the laser frequency &#x3c9;by a quantity &#x3b4;=&#x3b3;&#x3c9;and &#x3b4;2=q&#x3c9;+&#x3b3;2&#x3c9;, where q is an integer and &#x2212;0.5&#x2266;&#x3b3;1, &#x3b3;&#x2266;0.5; and calculating the vibration amplitude of the object from the optical beats spectrum deduced from the complex amplitude of an interferogram.

Digital off-axis heterodyne holographic interferometry for detecting vibration amplitude

A link part for a turbine engine which mounted between a fan cone and a fan disk supporting fan blades is provided. The link part includes an annular wall pierced by a plurality of orifices, each orifice for receiving a fastener member and terminated by a substantially perpendicular rim having an outer surface that provides an aerodynamic extension of the fan between an outer surface of the fan cone and an outer surface of a fan blade platform. The annular wall is made of a first material that is composite and is provided on an inner surface of the rim with a ring made of a second material that is different from the first and that is suitable for radially retaining the fan blade platform.

Axisymmetric part for an aviation turbine engine rotor

Growing community of inventors

Paris, France

Benjamin Samson