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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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Portable ultrasonic recording scanner is used for nondestructive inspection of welds. It is adaptable to continuous operation in one direction while maintaining oscillatory motion at a right angle to this direction. The scanning speed and oscillation frequency are independently adjustable.
Statistical repeated loads data on piston and turbine powered transport aircraft resulting from atmospheric turbulence, maneuvers, landing contact, oscillatory motion, and ground movement
Ground wind oscillatory loads and launch vehicle configurations
Flowgraph techniques for closed systems, discussing properties, approximation method, topology equation, frequency response, constraints, oscillatory and stochastic processes, etc
Fluid dynamic characteristics of propellant pumps in presence of oscillatory cavitation, noting performance of J-2 rocket engine system
Lienard type of differential equation for oscillatory system representing solution by Krylov-Bogoliubov method, noting inverse problem
Laminar to turbulent flow transition concepts studied in relation to oscillatory flows found in circulatory system
Michelson interferometer and laser source for measuring oscillatory motion for calibration of miniature accelerometers
An analytical study has been made to investigate the relationship between the magnitude of the applied spin recovery moment and the ensuing number of turns made during recovery from a developed spin with a view toward determining how to interpolate or extrapolate spin recovery results with regard to determining the amount of control required for a satisfactory recovery. Five configurations were used which are considered to be representative of modern airplanes: a delta-wing fighter, a stub-wing research vehicle, a boostglide configuration, a supersonic trainer, and a sweptback-wing fighter. The results obtained indicate that there is a direct relationship between the magnitude of the applied spin recovery moments and the ensuing number of recovery turns made and that this relationship can be expressed in either simple multiplicative or exponential form. Either type of relationship was adequate for interpolating or extrapolating to predict turns required for recovery with satisfactory accuracy for configurations having relatively steady recovery motions. Any two recoveries from the same developed spin condition can be used as a basis for the predicted results provided these recoveries are obtained with the same ratio of recovery control deflections. No such predictive method can be expected to give satisfactory results for oscillatory recoveries.
Surface coupled heat release effect on oscillatory amplitude of pressure coupled response in solid propellant
Conduction band structure in n-type strontium titanate investigated by measuring oscillatory magnetoresistance in high magnetic fields
Rigidly forced oscillatory dynamic stability method for measuring pitch and yaw damping derivatives in wind tunnels at transonic and supersonic speeds
Subharmonic liquid response to oscillatory axial excitation in arbitary geometry tank
Surface coupled heat release effect on oscillatory amplitude of pressure coupled response in solid propellant
Vlasov-Maxwell equations solved for large amplitude oscillatory electric fields with uniform external magnetic field, considering initial plasma current
Subharmonic liquid response to oscillatory axial excitation in arbitrary geometry tank
Aerothermoelasticity problems for Mars entry vehicles, discussing deceleration loads, separated hot gas flow, shield thermal gradients and oscillatory body motion
Time optimal control of bounded phase coordinate problem associated with large booster autopilot design, noting oscillatory system with two control inputs