An 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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Predicted and measured in-flight wing deformations of a forward-swept-wing aircraft


    Contributors:

    Conference:

    Annual Symposium of the Society of Flight Test Engineers ; 1990 ; Garden Grove, CA, United States


    Publication date :

    1990-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Forward swept wing flight demonstrator

    KRONE, JR., N. | AIAA | 1980


    High Performance Forward Swept Wing Aircraft

    D. G. Koenig / K. Aoyagi / M. E. Dudley et al. | NTIS | 1986


    High performance forward swept wing aircraft

    Koenig, David G. / Aoyagi, Kiyoshi / Dudley, Michael R. et al. | NTRS | 1988


    Forward Swept Tilt Wing V/STOL Aircraft

    SAE / American Helicopter Society / AIAA | British Library Conference Proceedings | 1997


    Forward Swept Tilt Wing V/STOL Aircraft

    SAE / American Helicopter Society / AIAA | British Library Conference Proceedings | 1997