Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2006-10-23
2009-06-09
Kwok, Helen C. (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S620000, C073S660000
Reexamination Certificate
active
07543500
ABSTRACT:
Single-crystal components of gas turbine engines, like turbine blades, are inspected in the installed state within the engine for cracking in certain critical areas using longitudinal ultrasonic waves. A first, rough orientation of the ultrasonic waves onto the critical area is accomplished under camera-visual control using an ultrasonic probe whose shape conforms to the respective component area and which, therefore, can be form-fitted to the component. For fine-positioning of the ultrasonic waves in the critical area, a reference signal is generated at a component-specific geometrical contour adjacent to the critical area by second ultrasonic waves emitted at a local distance to the first ultrasonic waves. The presence of this signal ensures the safe, disturbance-free detection of cracks in the critical blade area by means of longitudinal sonic waves. The invention includes an apparatus for the performance of the method.
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H.D.Mair; P. Ciorau; D. Owen; T. Hazelton; G. Dunning: “Ultrasonic simulation- Imagine3D and Simscan: Tools to solve the inverse problem for complex turbine components” AIP Conference Proceedings 2000, vol. 509, 2000, pp. 911-917, XP002373817.
Dunhill Anthony K.
Floege Heike
Litzenberg Holger
Scholz Jochen
Klima Timothy J.
Kwok Helen C.
Rolls-Royce Deutschland Ltd & Co KG
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