Automatic complete high-precision optical 3D measurement of air cooling-holes of gas turbine vanes for repair

Christoph Munkelt; Peter Kühmstedt; Lars Aschermann; Frank Seidel

doi:10.1117/12.2184709

22 June 2015 Automatic complete high-precision optical 3D measurement of air cooling-holes of gas turbine vanes for repair

Christoph Munkelt, Peter Kühmstedt, Lars Aschermann, Frank Seidel

Author Affiliations +

Proceedings Volume 9525, Optical Measurement Systems for Industrial Inspection IX; 952512 (2015) https://doi.org/10.1117/12.2184709
Event: SPIE Optical Metrology, 2015, Munich, Germany

Abstract

High-resolution contactless optical 3D measurements are well suited for determination of state and position of gas turbine vane cooling-holes during maintenance rework. The air flow through the cooling-holes protects the turbine vanes from the high temperatures. However, the coating needs to be renewed during repair of the vanes. The renewal process can lead to partially or completely filled cooling-holes. This paper describes a newly developed procedure to automatically detect and reopen such holes by laser-drilling for an effective new repair process. The turbine vane is scanned by a fringe projection based optical 3D scanner. The resulting 3D pointcloud delivers plenty of detail to automatically detect the cooling-holes. Poorly detected or undetected cooling-holes are interpolated from properly detected neighboring cooling-holes and reference default cooling-holes. For the resulting laser-drilling process the precise orientation in the vane mount must be known. To this end, position and orientation of the scanned vane in relation to the reference vane is determined. To validate the approach, numerous experiments regarding the cooling-hole extraction-performance were satisfactorily conducted. Real drilling experiments confirmed those findings and were used to validate the entire process.

Citation Download Citation

Christoph Munkelt, Peter Kühmstedt, Lars Aschermann, and Frank Seidel "Automatic complete high-precision optical 3D measurement of air cooling-holes of gas turbine vanes for repair", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 952512 (22 June 2015); https://doi.org/10.1117/12.2184709

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available