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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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At least 199 records · Page 11

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DOE OSTI2022

(U) Calculating First-Order Sensitivities to Material Density and Composition in Fixed-Source Problems Using the MCNP6 Perturbation Capability

The Taylor series (differential operator) perturbation method, as implemented in the PERT capability in MCNP6 (Ref. 1), can be used for first-order sensitivity analyses in fixed-source problems.2 Sensitivities of a response with respect to material and nuclide densities can be used for efficient first-order uncertainty quantification. This report discusses how to compute sensitivities of material densities and compositions in order to propagate uncertainties using the standard uncertainty propagation formula.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

NASA NTRS1963

A TECHNIQUE FOR OPTIMUM FINAL VALUE CONTROL OF POWERED FLIGHT TRAJECTORIES

Technique for controlling the acceleration vector along a powered flight trajectory using a linear perturbation method

TRAJECTORY CONTROL↗

NASA NTRS1965

Classification of magnetic shells.

Calculation of magnetic shell parameters based on Pennington perturbation method

MAGNETIC FIELD↗

NASA NTRS1966

A technique for optimal final value control of powered flight trajectories.

Technique for controlling acceleration vector along powered flight trajectory, using linear perturbation method

TRAJECTORY CONTROL↗

NASA NTRS1966

Spherical squeeze-film hybrid bearing with small steady-state radial displacement.

Spherical squeeze-film hybrid bearing with small steady-state radial displacement treated by perturbation method

GAS BEARING↗

NASA NTRS1967

Item program manual, Fortran IV version

Orbit calculation using Encke perturbation method and Fortran IV programming

FORTRAN↗

NASA NTRS1967

Ground instrumentation for Mariner IV OCCULTATION experiment.

Ground instrumentation system for Mariner IV OCCULTATION experiment, using Doppler frequency perturbation method for Mars atmospheric parameters determination

OCCULTATION↗

NASA NTRS1966

On a mathematical formulation of the constituent inversion problem for planetary atmospheres

Perturbation method for inverting radiative heat transfer equation to obtain vertical constituent distribution in planetary atmospheres

Conrath, B. J.↗

NASA NTRS1966

Trajectory optimization using fast-time repetitive computation

Perturbation method of computing optimum trajectories on hybrid and digital computers

Raby, J. S.↗

NASA NTRS1967

Application of conformal mapping to scattering and diffraction problems.

Plane wave scattered and diffracted fields for infinite cylinder of arbitrary cross section solved by boundary perturbation method and conformal mapping

Goodrich, R. F.↗

NASA NTRS1968

Nonlinear vibrations of beams with various boundary conditions.

Amplitude frequency relations of nonlinear vibrations in uniform beams with various boundary conditions using perturbation method

Evensen, D. A.↗

NASA NTRS1968

The general nature of acoustic-gravity waves.

Acoustic gravity waves equations in isothermal atmosphere developed by perturbation method

Gille, J. C.↗

NASA NTRS1968

Trajectory optimization using regularized variables.

Trajectory optimization of space vehicle with continuous thrust based on regularized equations, comparing perturbation method for earth-Jupiter rendezvous transfer

Lewallen, J. M.↗

NASA NTRS1968

On some possible simplifications and changes in Hansen's lunar theory.

Transforming Hansen lunar theory by referring satellite motion to almost ideal coordinate system, using general perturbations method

Musen, P.↗

NASA NTRS1969

Trajectory optimization using regularized variables.

Trajectory optimization of space vehicle with continuous thrust based on regularized equations, comparing perturbation method for earth-Jupiter rendezvous transfer

Lewallen, J. M.↗

NASA NTRS1969

Dynamic buckling loads of imperfection- sensitive structures from perturbation procedures.

Mechanical model for dynamic buckling of elastic imperfection-sensitive structures under step loading, using perturbation method

Danielson, D. A.↗

NASA NTRS1970

The compressible laminar boundary layer with heat transfer on a yawed cone at small angle of attack

Perturbation method for calculating velocity, temperature profiles, skin friction, and heat transfer coefficients in compressible laminar boundary of supersonic stream

Bodonyi, R. J.↗

NASA NTRS1970

Integration of the relativistic equations of motion of an artificial earth satellite

Perturbation method for relativistic motion analysis on earth orbiting spacecraft

Ghaffari, A.↗