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Predicted and measured in-flight wing deformations of a forward-swept-wing aircraftAn electrooptical flight-deflection measurement system (FDMS) is described in terms of its use in structural testing of the composite forward-swept wing of the X-29 aircraft. The wing deflected shapes measured using the present system are compared to the shapes predicted by NASTRAN and other codes as well as data from ground-test load measurements. The electrooptical FDMS is based on a control unit, two receivers, a target driver, and 12-16 IR LED targets. The FDMS determines the in-flight deflected wing shapes at a variety of altitudes at Mach 0.9, and the results are compared to the analytically predicted wing-twist distributions. The FDMS data describe the predicted increasing streamwise twist with increasing dynamic pressure and suggest that the streamwise twist is more prevalent at the inboard measurement station than at the wing tip. This hook shape is not represented in the predicted data, and suggestions are given for improving the modeling of the X-29 wing.
Document ID
19920053312
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lokos, William A.
(NASA Flight Research Center Edwards, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: Annual Symposium of the Society of Flight Test Engineers
Location: Garden Grove, CA
Country: United States
Start Date: August 6, 1990
End Date: August 10, 1990
Sponsors: Society of Flight Test Engineers, Boeing Aircraft Co., Endevco
Accession Number
92A35936
Distribution Limits
Public
Copyright
Other

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