Analytical and photogrammetric characterization of a planar tetrahedral truss
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19 upper surface analytically predict assembled truss average Axonometric projection Belleville washers best-fit plane bundle adjustment close-range photogrammetry compression cross-sectional stiffness data frame DCDT DCDT's Deflection determined diameter displacement of truss effect elastic modulus error sources 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 Lower joint measured and predicted Measured node positions measurement precision member axial stiffness member length errors minimize its contribution mounting NASA node locations Node Number nominal normal displacement normal equations object space coordinate percent 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 tion truss components truss nodes truss surface truss upper surface Upper joint upper surface nodes values