Calculation of leakage between metallic sealing surfaces.
Leakage flow calculation method for seal interface between metallic surfaces, noting application to fluid connector design
Gitzendanner, L. G.↗
SEARCH · Engineering Papers
Results for “CALCULATION METHODS”
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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Measurement of log-amplitude variance.
Log amplitude variance calculation methods compared in statistics of optical scintillation by application to measurements with laser
Bufton, J. L.↗
Calculative techniques for transonic flows
Calculation methods for predicting transonic aerodynamic characteristics of wing-body combinations
Frey, W. H.↗
Comparative analysis of acoustic testing techniques, exhibit A Final report
Calculation methods for vibration responses of spacecraft structural members to acoustic fields
Gruner, W. J.↗
Appraisal of an iterative method for bound states
Radial Schrodinger equation bound state eigenvalues and properties by iterative method, calculating Coulomb potentials
Anderson, N.↗
Electron-ion recombination - A critical review of theories and experimental results for an argon plasma
Partially ionized gas electron-ion recombination rate coefficients calculation methods compared with Ar plasma data
Clark, K. J.↗
N2/plus/ potential-energy curves
Molecular nitrogen ion potential energy curves based on valence bond method, calculating sextet and quartet states at intermediate internuclear separation distances
Stallcop, J. R.↗
Performance of a ten-stage electrostatic depressed collector for klystrons
Klystron power conversion efficiency augmentation by electrostatic depressed collector design, presenting performance prediction calculation method
Mihran, T. G.↗
Scattered and reflected light intensities above the atmosphere
Calculational method for predicting angular distribution of sunlight upwelling flux scattered by atmosphere and reflected by ground, using Monte Carlo data
Thompson, B. C.↗
Alkyl substituent effects on gas-phase acidities - The influence of hybridization.
Exploration of the effect on acidity of alkyl groups bonded to trigonal and digonal carbon. Some results on the relative acidities of toluene and p-xylene, and acetylene and substitute acetylenes, as determined by ion cyclotron resonance (icr) spectroscopy, are described. Some limitations of the CNDO/2 calculation method are discussed.
Brauman, J. I.↗
Sonic-boom propagation through a stratified atmosphere.
Theoretical approach to the problem of predicting the sonic-boom signature due to a maneuvering aircraft, with outline of the resulting calculation method. This method includes the effects of a variable, stratified atmosphere, and is based on geometric-acoustic principles. A nonlinear distortion is used to account for the weak shock field. The analytical results are compared with experimental data and excellent agreement was found, particularly with regard to signature length.
Hayes, W. D.↗
The structure of shock wave in a gas consisting of ideally elastic, rigid spherical molecules
Principal approaches are examined to the theoretical study of the shock layer structure. The choice of a molecular model is discussed and three procedures are formulated. These include a numerical calculation method, solution of the kinetic relaxation equation, and solution of the Boltzmann equation.
Cheremisin, F. G.↗
Wind
A space vehicle's response to atmospheric disturbances includes many parameters, the choice of criteria (parameters) depending upon the vehicle configuration and the specific mission. Response calculation methods for all phases of vehicle design are separated into their various phases and parts, using different approaches and methods of evaluation, as the particular phase demands. Although not independent, these phases include: (1) preliminary design; (2) final structural design; (3) guidance and control system design and optimization (preliminary and final); and (4) establishment of limits and procedures for launch and flight operations. Thus, the proper selection, representation, and use of wind information require the skillfully coordinated efforts of aerospace meteorologists and engineers.
Margaret B Alexander↗
Boundary-layer transition on a plate subjected to simultaneous spanwise and chordwise pressure gradients
The boundary-layer transition on a short plate was studied by means of the china-clay visual technique. The plate model was mounted in a wind tunnel so that it was subjected to small simultaneous spanwise and chordwise pressure gradients. Results of the experimental study, which was performed at three subsonic velocities, indicated that the transition pattern was appreciably curved in the spanwise direction but quite smooth and well behaved. Reasonable comparisons between predictions of transition and experiment were obtained from two finite-difference two-dimensional boundary-layer calculation methods which incorporated transition models based on the concept of a transition intermittency factor.
Boldman, D. R.↗
Apollo 17 mission Report. Supplement 6: Calibration results for gamma ray spectrometer sodium iodide crystal
A major difficulty in medium energy gamma-ray remote sensing spectroscopy and astronomy measurements was the high rate of unwanted background resulting from the following major sources: (1) prompt secondary gamma-rays produced by cosmic-ray interactions in satellite materials; (2) direct charged-particle counts; (3) radioactivity induced in the detector materials by cosmic-ray and trapped protons; (4) radioactivity induced in detector materials by the planetary (e.g., earth or moon) albedo neutron flux; (5) radioactivity induced in the detector materials by the interaction of secondary neutrons produced throughout the spacecraft by cosmic-ray and trapped proton interactions; (6) radioactivity induced in spacecraft materials by the mechanisms outlined in 3, 4, and 5; and (7) natural radioactivity in spacecraft and detector materials. The purpose of this experiment was to obtain information on effects 3, 4, and 5, and from this information start developing calculational methods for predicting the background induced in the crystal detector in order to correct the Apollo gamma-ray spectrometer data for this interference.
Dyer, C.↗
Effects of mismatch on group delay of microwave transmission
Calculation method can be applied to transmission lines operating in TEM mode or to single-mode propagation in waveguides. Derived data are useful for estimating limits on variation of group delay with frequency or in determining how much discontinuity reduction is necessary to achieve given accuracy in predicting group delay.
Beatty, R. W.↗
Flight Mechanics/Estimation Theory Symposium
The conference emphasizes orbital position estimation and trajectory calculation methods that consider flight mechanical parameters.
Velez, C. E.↗
A subvortex technique for the close approach to a discretized vortex sheet
The close-approach problem associated with flow calculation methods based on vortex-lattice theory was examined numerically using two-dimensional discretized vortex sheets. The analysis first yields a near-field radius of approximately the distance apart of the vortices in the lattice; only within this distance from the sheet are the errors arising from the discretization significant. Various modifications to the discrete vortices are then considered with the objective of reducing the errors. This leads to a near-field model in which a vortex splits into an increasing number of subvortices as it is approached. The subvortices, whose strengths vary linearly from the vortex position, are evenly distributed along an interpolated curve passing through the basic vortices. This subvortex technique can be extended to the three-dimensional case and is efficient because the number of vortices is effectively increased, but only where and when needed.
Maskew, B.↗