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Applications of Ko Displacement Theory to the Deformed Shape Predictions of the Doubly-Tapered Ikhana Wing
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Author and Affiliation:
Ko, William L.(NASA Dryden Flight Research Center, Edwards, CA, United States);
Richards, W. Lance(NASA Dryden Flight Research Center, Edwards, CA, United States);
Fleischer, Van Tran(NASA Dryden Flight Research Center, Edwards, CA, United States)
Abstract: The Ko displacement theory, formulated for weak nonuniform (slowly changing cross sections) cantilever beams, was applied to the deformed shape analysis of the doubly-tapered wings of the Ikhana unmanned aircraft. The two-line strain-sensing system (along the wingspan) was used for sensing the bending strains needed for the wing-deformed shapes (deflections and cross-sectional twist) analysis. The deflection equation for each strain-sensing line was expressed in terms of the bending strains evaluated at multiple numbers of strain-sensing stations equally spaced along the strain-sensing line. For the preflight shape analysis of the Ikhana wing, the strain data needed for input to the displacement equations for the shape analysis were obtained from the nodal-stress output of the finite-element analysis. The wing deflections and cross-sectional twist angles calculated from the displacement equations were then compared with those computed from the finite-element computer program. The Ko displacement theory formulated for weak nonlinear cantilever beams was found to be highly accurate in the deformed shape predictions of the doubly-tapered Ikhana wing.
Publication Date: Oct 01, 2009
Document ID:
20090040594
(Acquired Nov 24, 2009)
Subject Category: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number: NASA/TP-2009-214652, DFRC-762, H-3006
Document Type: Technical Report
Financial Sponsor: NASA Dryden Flight Research Center; Edwards, CA, United States
Organization Source: NASA Dryden Flight Research Center; Edwards, CA, United States
Description: 30p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: DEFORMATION; DISPLACEMENT; SHAPES; SWEPT WINGS; MATHEMATICAL MODELS; PILOTLESS AIRCRAFT; COMPUTER PROGRAMS; DETECTION; FINITE ELEMENT METHOD; NONLINEARITY; CANTILEVER BEAMS; DISCRETIZATION (MATHEMATICS)
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