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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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For flexibility in forming a curved surface, a honeycomb configuration using multiple pleats has proved superior to the usual core structures. The partial pleats formed in individual cell walls permit movements to and from the central axis without tearing.
Free flight tests of 45-deg swept wings of 3.15 aspect ratio and 0.54 taper ratio to measure wing damping and possible transonic flutter
Stressed and deformed state of stiffened circular cylindrical shell acted upon by transverse pressure and uniform axial loads
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Application of spectral identification adaptive control system to large launch vehicle in complete closed loop trajectory simulation
Approximate steady state time response expression for RC commutated network used to investigate modifications of rate gyro blender
Application of quadratic optimal control, least squares state, and parameter estimation to stability and control of flexible launch vehicle
Finite displacements of very shallow orthotropic shells and plates at small deformations
Reinforced rings and stress concentration reduction near holes of various type plates
Plane stress analysis using Fourier series of edge stiffened isotropic or orthotropic elastic rectangular plate subjected to prescribed temperature distribution and boundary loads
Mathematical model and FORTRAN 4 program for simulating ray tracing of signal path in spherically stratified atmosphere
Computer program calculates the stresses and lateral deflections to a uniform thickness flat plate with a uniform pressure load. The plate to be analyzed may have several different boundary conditions. The program is written in FORTRAN 4 for use on the CDC 6600 computer.
Vibrational characteristics of large liquid propellant space vehicle
Refraction of radar beams passing through spherically symmetric atmosphere
Elbow forming in jacketed pipes while maintaining separation between core shape and jacket pipes
Numerical analysis of supersonic flutter of flat rectangular, biaxilly stressed sandwich panels
Longitudinal profiles representing 5872.5 m of mapped lava tubes and a photogeologic map relating lava tubes to surface geology, regional structure and topography are presented. Three sets of lava tubes were examined: (1) Arnold Lava Tube System (7km long) composed of collapsed and uncollapsed tube segments and lava ponds, (2) Horse Lava Tube System (11 km long) composed of parallel and anastomosing lava tube segments, and (3) miscellaneous lava tubes. Results of this study tend to confirm the layered lava hypothesis of Ollier and Brown (1965) for lava tube formation; however, there are probably several modes of formation for lava tubes in general. Arnold System is a single series of tubes apparently formed in a single basalt flow on a relatively steep gradient. The advancing flow in which the tubes formed was apparently temporarily halted, resulting in the formation of lava ponds which were inflated and later drained by the lava tube system. Horse System probably formed in multiple, interconnected flows. Pre-flow gradient appears to have been less than for Arnold System, and resulted in meandrous, multiple tube networks.