Method for detecting cracks in an aircraft or gas turbine component

Patent metadata

Field	Value
Publication number	US-9719774-B2
Application number	US-201213479316-A
Country	US
Kind code	B2
Filing date	May 24, 2012
Priority date	May 24, 2011
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A method for detecting cracks in an aircraft or gas turbine component includes ascertaining geometric data about the component using an optical measurement method, analyzing the geometric data, using an electronic evaluation device, so as to automatically recognize and/or classify at least one of cracks and other damage and storing a position of the at least one of cracks and other damage.

First claim

What is claimed is:

1. A method for detecting cracks in an aircraft or gas turbine component, the method comprising:
ascertaining geometric data about the component using an optical measurement method, the optical measurement method being carried out at a distance from a surface of the component being measured using a distance sensor configured to measure the distance between a measurement device and the surface of the component, and using a white light interferometer having a beam splitter;
analyzing the geometric data, using an electronic evaluation device, so as to at least one of recognize and classify, automatically, at least one of cracks and other damage; and
storing a position of the at least one of cracks and other damage.

2. The method recited in claim 1 , wherein the ascertained geometric data are automatically compared to mathematically predefined and stored data relating to at least one of nominal characteristics, contours, tolerances and damage patterns.

3. The method recited in claim 1 , wherein the ascertained geometric data are used for measuring the component.

4. The method recited in claim 1 , wherein the component is a combustion chamber component of an aircraft engine.

5. The method recited in claim 1 , further comprising ascertaining at least one of requirements and scope of repair of the component using the analyzed geometric data.

6. The method recited in claim 5 , further comprising at least one of repairing and processing the component using the analyzed geometric data.

7. The method recited in claim 6 , wherein the at least one of repairing and processing is automated.

8. The method recited in claim 1 , further comprising measuring variations in brightness and assigning height values to each pixel of the geometric data.

9. The method recited in claim 8 , further comprising generating a computer model of the component by meshing or paving the height values, wherein the at least one of cracks and other damage are represented as at least one of polylines and polygons in the model.

10. The method as recited in claim 1 , further comprising comparing the ascertained geometric data to mathematically predefined and stored data relating to damage patterns so as to determine a scope of repair, and then repairing the component based on the determined scope of repair.

Assignees

• Ullrich Thiemo
• Ernst Michael
• Lufthansa Technik Ag

Inventors

• Ullrich Thiemo
• Ernst Michael

Classifications

• Y10T29/49869

  by flexing · CPC title

• G01N21/9515

  Objects of complex shape, e.g. examined with use of a surface follower device (measuring contours and curvatures G01B11/24) · CPC title

• G01B9/0209 Primary

  Low-coherence interferometers · CPC title

• B23P6/002

  Repairing turbine components, e.g. moving or stationary blades, rotors, (B23P6/045 takes precedence) · CPC title

• G01B11/2441

  using interferometry · CPC title