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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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Invariants of triangular shell element stiffness matrices associated with polyhedral deflection distribution, discussing effect of geometry
Explicit expressions for stiffness matrix of triangular torus elements associated with linear displacement fields and generalized Hookian material
Sun perturbed earth-moon triangular point investigated for stable periodic coplanar orbits
The damping in roll and rolling effectiveness of two models of a missile having cruciform, triangular, interdigitated wings and tails have been determined through a Mach number range of 0.8 to 1.8 by utilizing rocket-propelled test vehicles. Results indicate that the damping in roll was relatively constant over the Mach umber range investigated. The rolling effectiveness was essentially constant at low supersonic speeds and increased with increasing mach numbers in excess of 1.4 over the Mach number range investigated. Aeroelastic effects increase the rolling-effectiveness parameters pb/2V divided by delta and decrease both the rolling-moment coefficient due to wing deflection and the damping-in-roll coefficient.
Compatible triangular plate elements for normal and in-plane displacements, discussing nine degree of freedom element, strain energy, simply supported and clamped plates
Nystagmus and sensation of rotation from semicircular canal stimulation by triangular waveforms of angular velocity
Shear stress analysis of triangular plate elements
Perturbation theory based on Lie transforms and application to motion stability near sun perturbed earth-moon triangular libration points
Triangular decomposition as aid in determining eigenvalues of large-order banded symmetric matrices
Comparison of spherical and triangular boundary layer trips on flat plate at supersonic speed
Aerodynamic characteristics of large-scale model with lift fan mounted in 5 percent thick triangular wing
Thinning algorithms on rectangular, hexagonal, and triangular arrays
Aerodynamic characteristics at Mach numbers 1.60 to 2.16 of blunt-nose missile model having triangular cross section and fixed triform fins
Two dimensional motion stability near sun-perturbed earth-moon triangular libration points, using computerized high order treatment
Triangular wheel and suspension vehicle is described which can scale obstacle higher than its own length.
The aircraft noise created by the impingement of engine exhaust jet of STOL aircraft with externally blown flaps is discussed. It was determined that the jet-flap interaction noise can be lowered by reducing the impinging velocity of the jet. The reduction must occur at a specific distance from the flap to be effective. The peak axial-velocity decay obtained with rectangular and triangular single element mixer nozzles is presented. Equations are developed for estimating the peak axial velocity decay curves for a wide range of nozzle configurations.
The velocity profiles upon which the pressure-loss calculations are based, are recomputed using the previously described method of reference (1960). The pressure drop is then computed using the energy integral equation; both rectangular and equilateral triangular ducts are considered. It is demonstrated that, using this equation, the pressure-drop parameter can be improved.
A nonconforming plate-bending finite element of triangular shape and associated quadrilateral elements are developed. The transverse displacement is approximated within the element by a quintic polynomial. The formulation takes into account the effects of transverse shear deformation. Results of the static and dynamic analysis of a square plate, with edges simply supported or clamped, are compared with exact solutions. Good accuracy is obtained in all calculations.