X-30 NASP 4



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English: The proposed National Aerospace Plane (NASP) consists of a long, flexible, lifting-body fuselage and relatively small, highly swept, all-movable, clipped-delta wings. The fuselage flexibility and the all-movable feature of the clipped-delta wings may make the vehicle susceptible to aeroelastic instabilities throughout the flight envelope. A wind-tunnel test of a NASP model was conducted to meet three objectives: to measure the flutter mechanism inherent to this type of vehicle; to examine the effect of parametric variations on the flutter behavior of the model; and to correlate the experimental data with analysis. A tenth-scale representation of an unclassified version of the NASP vehicle was flutter tested in the Transonic Dynamics Tunnel (TDT). This representation was a full-span model with pitch and plunge degrees of freedom simulated with springs in the floor mount. The model had all-movable, clipped-delta wings and cantilevered, clipped-delta vertical fins. The stiffness of the wing actuators was simulated with springs. A photo of the model mounted in the wind tunnel is shown in the figure. A flutter analysis of the model was performed using calculated linear, lifting-surface aerodynamics. The wind-tunnel test of this model showed the NASP-type vehicles employing single-pivot, all-movable wings are susceptible to body-freedom flutter. The test results show that increasing the wing-actuator-pitch stiffness can make the body-freedom flutter instability less critical. The correlation of flutter analysis to the experimental data indicates that the mathematical tools used in this study were sufficient to predict the body-freedom flutter encountered in the wind tunnel.
Date 30 November 1992(1992-11-30)
Source http://nix.nasa.gov/info?id=EL-1996-00226 (direct link)
Author NASA
Shuttle.svg This image or video was catalogued by Langley Research Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: EL-1996-00226 AND Alternate ID: L92-12800.
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Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)


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