Original Date: 05/08/1995
Revision Date: 01/18/2007
Information : Metronor Photogrammetry
McDonnell Douglas Aerospace (MDA)-St. Louis is piloting the implementation of a Metronor Photogrammetry System, a video-camera based, computer-coordinated measurement tool that provides three-dimensional x, y, and z points. Photogrammetry data is verified automatically using Unigraphics models.
The system was purchased from Metronor AS of Norway and consists of two Kodak cameras, an IBM notebook computer, HP DeskJet printer, Sun workstation, and two light pens.
Through use of the Metronor Photogrammetry System, MDA-St. Louis is striving to eliminate the use of wet film cameras where film development does not allow for real time information gathering. The new photogrammetry system on-line data storage capability will also replace large, hard copy quality assurance data sets.
Using this system, Unigraphics models will be downloaded to the shop floor, allowing real time measurements and analysis to be made. This real time processing will improve the cycle time and help avoid inspection escapes. System accuracy is a function of video camera spacing on the floor. When inspecting individual parts, accuracy has been demonstrated that is equal to the Coordinate Measuring Machine (CMM) capability (plus or minus 0.001). The new photogrammtery system will be useful in meeting Quality Assurance inspection requirements such as tooling accuracy verification and validation, and aircraft surface waviness measurement.
Cost savings data has been estimated for the Metronor Photogrammetry System. The current cost per detail inspected is $368, compared to $14.50 with the new system. Cycle time is also reduced from 12.7 man hours per detail inspected to 0.5 with the new system. With an estimated 625 details inspected per year, total cost savings of $220,937 and total cycle time reduction of 7,625 man hours are projected.
MDA-St. Louis is planning a future quality assurance measurement strategy using the Metronor Photogrammetry System in conjunction with other advanced equipment such as the Laser Tracking Measurement System, portable CMMs, and Theodolite Measurement Systems. These devices will be electronic, computerized measurement systems which use Unigraphics models on a real time, interactive basis. This will eliminate the need for previously generated inspection points and manual evaluation of measured results. Future systems will also have a voice- activated interaction capability.
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