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METHOD FOR PROCESSING SCANNED PART INFORMATION

IP.com Disclosure Number: IPCOM000248092D
Publication Date: 2016-Oct-25
Document File: 6 page(s) / 758K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method is provided for processing point cloud data to be used in measuring a gas turbine engine component.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 44% of the total text.

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METHOD FOR PROCESSING SCANNED PART INFORMATION

ABSTRACT


[0001] A method is provided for processing point cloud data to be used in measuring a gas turbine engine component.

BACKGROUND


[0002] Gas turbine engines incorporate large numbers of airfoils. In order to obtain optimum engine performance and efficiency, it is desirable to know how closely the actual airfoils conform to their intended design.


[0003] One specific example is a turbine nozzle. In a turbine nozzle, it is crucial to not only achieve desired flow areas between airfoils, but also to accurately measure the minimum throat area that will be used in the engine's control system and cycle simulation software for the engine. The area is also critical to turbine aeromechanics.


[0004] There are various methods used to measure minimum nozzle throat area and other airfoil characteristics. Some shops employ a hand-held gauge that slides into the throat. Some use a coordinate measurement machine ("CMM"). The hand-held gauges are subject to operator variation, breakage, and calibration issues. The CMM must be programmed to drive the stylus to specific touch points around the throat that are defined on the drawing for a theoretically perfect part using a computer model; however, actual parts are subject to manufacturing variation so the CMM may not actually hit the desired location, thus producing an erroneous result.


[0005] 3-D scanning devices are known which can scan a part to produce a "point cloud" model, but the output data is not in the optimal orientation for further processing (e.g. manipulation, measurements).


[0006] Described herein is a method for processing point cloud data to facilitate part

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measurements.

BRIEF DESCRIPTION OF THE DRAWINGS


[0007] The concept may be best understood by reference to the following description taken in conjunction with the accompanying drawing figures, in which:


[0008] FIG. 1 is a perspective view of a turbine nozzle segment of a gas turbine engine;


[0009] FIG. 2 is a view taken along lines 2-2 of FIG. 1; and


[0010] FIG. 3 is a schematic perspective view of a scanned image of a turbine nozzle segment.

DETAILED DESCRIPTION OF THE CONCEPT


[0011] Illustrated in FIG. 1 is an exemplary high pressure turbine ("HPT") nozzle segment 10 A plurality of such nozzle segments 10 are assembled in the circumferential side-by-side fashion to build up an HPT nozzle. The nozzle segment 10 includes one or more hollow, airfoil -shaped, internally-cooled vanes 12 each having a leading edge 14, a trailing edge 16, a root 18, a tip 20, and spaced-apart pressure and suction side walls 22 and 24, respectively. An arcuate outer band 26 having an outer platform 28 is attached to the tips 20 of the vanes 12. An arcuate inner band 30 having an inner platform 32 is attached to the roots 18 of the vanes 12. The outer and inner band 26 and 30 define the outer and inner radial boundaries, respectively of the primary gas flowpath through the nozzle segm...