Analytical and photogrammetric characterization of a planar tetrahedral truss
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19 upper surface analytically predict average Axonometric projection Belleville washers best-fit plane bundle adjustment close-range photogrammetry compression cross-sectional stiffness data frame DCDT DCDT's determined diameter displacement of truss effect elastic modulus error sources evaluate the planar experimental figure 8(a finite element analysis finite element model function of node graphite tube graphite-epoxy tube gravity load intended shape jackscrew joint section Langley Research Center length variation load cell load-displacement measured and predicted Measured node positions measurement precision member axial stiffness member length errors minimize its contribution mounting NASA node center node locations Node Number 15 nominal normal displacement normal equations object space coordinate percent Photogrammetry measurement Photogrammetry test photographed predicted and measured predicted node projective equations projective parameters retroreflective root-mean-square rotation shape to minimize shown in figure stations sults support truss surface error tensile preload tetrahedral truss structure tion truss components truss nodes truss surface truss upper surface upper surface nodes values