A Triangulation Technique for Obtaining Deflections of Aircraft Transparencies During Bird Impact Testing,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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A technique for determining a time history for the displacement in space of points on the inside surface of an aircraft transparency during and after the simulated impact of a bird has been developed. This method utilizes two high speed motion picture cameras located in a three dimensional space which also contains designated points on the transparency surface. The cameras are positioned so that a common field of view contains points for which deflection history is required. Displacements of the images of given points in the film frames from each camera are used to obtain positions in a three dimensional space. All optical magnifications and changes in point to camera distances are accounted for. In addition to obtaining deflection data for selected points, the films are also useful for describing the footprint of the bird on the transparency, an important improvement in the ability to model bird loading in computerized dynamic analysis efforts. As an example of the application of this process, data resulting from a bird impact on a T-38 windshield is included.