This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.
Abstract Details
Activity Number:
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189
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Type:
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Invited
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Date/Time:
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Monday, August 2, 2010 : 10:30 AM to 12:20 PM
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Sponsor:
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Section on Physical and Engineering Sciences
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Abstract - #308924 |
Title:
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Sequential Application of a Third-Order Test Design in Six Dimensions Incorporating an Orthogonality Constraint
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Author(s):
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William Line*+ and Mike Morton and Norman Draper
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Companies:
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DOES Institute and DOES Institute and University of Wisconsin-Madison
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Address:
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2531 Woodbine Road, Winston-Salem, NC, 27104,
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Keywords:
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Sequential Test Design ;
Third Order Test Design ;
Orthogonality Constraint ;
Six Dimensions ;
NASA wind tunnel application ;
Cost Savings
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Abstract:
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The Wrights used the 1st wind tunnel balance in 1903. This paper shows a designed test in 2000 on a NASA wind tunnel balance calibration application. Previously NASA used the one factor test method to calibrate balances. Both methods were tested on the same balance. Compared to the one-factor method, the designed test reduced costs by 85% and improved data quality. NASA patented this work, though they usually make innovations public domain. The 3 Force and and 3 moment balance dimensions must be orthogonal because of interaction effects. This constraint was satisfied by crossing a 3-variable design with a 2-variable design. In aersospace work, 2nd order models are often insufficient when there is lack of fit. A sequential design was needed whereby a 3rd order design was added to the 2nd order design. The ANOVA tables, 2nd and 3rd order test designs, and confounded terms will be shown.
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