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  • 1
    Publication Date: 2019-07-12
    Description: 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.
    Keywords: Aircraft Design, Testing and Performance
    Type: NASA/TP-2009-214652 , DFRC-762 , H-3006
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: A Williams International FJ44-3A 3000-lb thrust class turbofan engine was tested in the NASA Glenn Research Center s Aero-Acoustic Propulsion Laboratory. This report presents the test set-up and documents the test conditions. Farfield directivity, in-duct unsteady pressures, duct mode data, and phased-array data were taken and are reported separately.
    Keywords: Aircraft Design, Testing and Performance
    Type: NASA/TM-2009-215594 , AIAA Paper 2009-0620 , E-16885 , 47th Aerospace Sciences Meeting; Jan 05, 2009 - Jan 08, 2009; Florida; United States
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-19
    Description: Several areas of scientific interest have been identified that would significantly benefit from using Unmanned Aircraft Systems (UAS) for gathering remote sensing data. UAS are uniquely suited for applications that require long dwell times and/or in locations that are generally too dangerous for manned aircraft. Sea ice characterization, mapping of fault lines, hurricane monitoring, and satellite validation are some examples of applications that are benefited by the use of UAS. UAS are not without their challenges, however. Instruments must be automated and miniaturized, and be able to operate in extreme conditions (i.e. high altitude environments). However, because UAS currently lack a see-and-avoid capability, the greatest challenge is getting access to the airspace required to accomplish science missions. The ability for UAS to access airspace varies from country to country. This paper will give a brief overview of different UAS remote sensing applications, and will address general world airspace issues and challenges with a specific look at the United States.
    Keywords: Aircraft Design, Testing and Performance
    Type: ISPRS ICWG I/V Third International Workshop - The Future of Remote Sensing; Oct 20, 2009 - Oct 21, 2009; Antwerp; Belgium
    Format: text
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