Fluidic dampening film supply method for a guiding bearing of a turbine engine shaft

Patent metadata

Field	Value
Publication number	US-9234462-B2
Application number	US-201213546526-A
Country	US
Kind code	B2
Filing date	Jul 11, 2012
Priority date	Jul 21, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A fluidic dampening film supply method for a guiding bearing of a turbine engine shaft, said turbine engine being known to vibrate according to at least one given vibratory mode, said turbine engine being adapted to enter in resonance at a given resonance speed (w r ) for said given vibratory mode, a monitoring range (P) being defined around the resonance speed (w r ), a method wherein the fluidic dampening film of the guiding bearing being only supplied with fluid when the rotation speed of the turbine engine belongs to the monitoring range (P).

First claim

The invention claimed is:

1. A fluidic dampening film supply method for a guiding bearing of a turbine engine shaft, said turbine engine being known to vibrate according to at least one given vibratory mode, said turbine engine being adapted to enter in resonance at a given resonance speed for said given vibratory mode, and a monitoring range being defined around the resonance speed, the method comprising:
not providing a fluid supply of the fluidic dampening film for the guiding bearing;
measuring an amplitude of vibrations in the turbine engine using at least one vibration sensor;
comparing the measured amplitude to a first predetermined threshold;
supplying the fluidic dampening film of the guiding bearing when the measured amplitude is greater than the first predetermined threshold;
comparing the measured amplitude to a second predetermined threshold; and
stopping the fluid supply of the fluidic dampening film of the guiding bearing if the measured amplitude is lower than the second predetermined threshold,
wherein the fluidic dampening film is supplied when a rotational speed of the turbine engine shaft is within the monitoring range, and the fluidic dampening film is not supplied when the rotational speed of the turbine engine shaft is outside of the monitoring range.

2. The method according to claim 1 , wherein the first and second predetermined thresholds are the same for a determined vibratory mode.

3. The method according to claim 2 , wherein the first and second predetermined thresholds are the same for every vibratory mode.

4. The method according to claim 1 , wherein the guiding bearing includes an external ring integral with a portion of a low pressure shaft of said turbine engine, an internal ring integral with a portion of a high pressure shaft of said turbine engine, and rolling means enclosed by said external and internal rings, and
wherein the fluidic dampening film is supplied between said external ring and said rolling means.

Assignees

• Chevillot Fabrice
• Morreale Serge Rene
• Snecma

Inventors

• Chevillot Fabrice
• Morreale Serge Rene

Classifications

• F02C7/06 Primary

  Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) · CPC title

• F16C2360/00

  Engines or pumps · CPC title

• F16C27/04

  Ball or roller bearings, e.g. with resilient rolling bodies · CPC title

• F16F15/0237

  involving squeeze-film damping · CPC title

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title