Accuracy of modal stress calculations by the finite element method
Geometrically exact finite element for thin shells of revolution, using approximation to predict boundary layer stress distribution during vibration
Adelman, H. M.↗
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Results for “accuracy”
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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On the reduction and accuracy of precise Baker-Nunn observations
Film reduction and time keeping used at Smithsonian Astrophysical Observatory for Baker-Nunn films
Lambeck, K.↗
Coefficient-accuracy requirements for digital controllers with high sampling rates
Bits quantity required to represent coefficient within digital controller with high sampling rate
Johnson, J. C.↗
Accuracy of IR horizon sensors as affected by atmospheric considerations
Low altitude atmospheric effects on IR beam horizon sensors in carbon dioxide band, noting corrections for spacecraft attitude measurement
Curfman, H. J., Jr.↗
The effects of major error sources on planetary spacecraft navigation accuracies
Preflight error statistics of earth based Doppler tracking for Mariner navigation concerning Mars 1971 and Venus-Mercury 1973 missions
Jordan, J. F.↗
A limit analysis for determining the accuracy of ionized gas composition
Limit analysis for ionization potential reduction effect on ionized gas atomic composition, considering temperature and electron density
Horton, T. E.↗
Study aids accuracy of turbopump axial thrust analysis
Test program to verify theory used in calculating axial thrust uses turbopump instrumented with /a/ proximity transducers for measuring shaft position, /b/ a strain gage thrust bearing carrier to measure axial thrust, and /c/ internal pressure taps to define component pressure gradients used in thrust calculations.
Nielson, C. E.↗
Bending vibrational data accuracy study
Computer program for predicting structural bending vibrational data
Collins, J. D.↗
Tracking and navigational accuracy analysis
Sequential estimation with process noise for processing DSN tracking data during planetary orbiter missions and Doppler determinations of polar motion using satellites
Source record↗
A summary of availability and accuracy of landing aids for shuttle applications
Shuttlecraft landing and navigational aid capabilities
Labrecque, R. J.↗
Study to improve the accuracy and resolution of FPS-16 radar/Jimsphere wind measurements Final report
Data processing methods for improving FPS-16 radar/Jimsphere system measurements of atmospheric motion
De Mandel, R. E.↗
Guyan Reduction Solutions Recycled for Improved Accuracy
Procedures for accurate condensing of eigenvalue solutions in structural analysis using Guyan reduction solutions
Levy, R.↗
Accuracy of Langmuir probe measurements and skin potential on satellites
Satellite skin potential and errors in electron density and temperature determinations by Langmuir probe measurements, using model ionosphere
Shkarofsky, I. P.↗
Effect of radiometric errors on accuracy of temperature-profile measurement by the spectral-scanning method
Spectral scanning method for determining temperature profile of jet- or rocket-engine exhaust stream by gas radiation and transmittance measurements, discussing radiometric errors effects
Buchele, D. R.↗
An airborne simulator investigation of the accuracy of an optical track command missile guidance system
Explore the source record for details and available documents.
Douvillier, J. J., Jr.↗
The accuracy of laser tracking
A brief discussion of the actual laser tracking performance of geodetic satellites is followed by a discussion of the errors inherent in the laser system. An estimate is made of the capability expected within the next few years for the tracking of a heliocentric probe. The GEOS 1, GRARR, and GEOS 2 systems are considered. Errors in the tracking of a heliocentric probe are noted. These include errors due to the earth's atmosphere, (beam bending, atmospheric absorption, atmospheric turbulence, and atmospheric distortion of short laser pulses), and errors due to coronal effects.
Blamont, J. E.↗
On the accuracy of the relativistic parameters beta, gamma, and the solar oblateness coefficient J2, as deduced from ranging data of a drag-free space probe
Motion in the general gravity field is described mathematically. A covariance analysis, based on two simple models, is presented. Two drag-free space probes were considered, for which the orbital elements are given.
Roth, E. A.↗
Effect of radiometric errors on accuracy of temperature-profile measurement by spectral scanning using absorption-emission pyrometry
The spectral-scanning method may be used to determine the temperature profile of a jet- or rocket-engine exhaust stream by measurements of gas radiation and transmittance, at two or more wavelengths. A single, fixed line of sight is used, using immobile radiators outside of the gas stream, and there is no interference with the flow. At least two sets of measurements are made, each set consisting of the conventional three radiometric measurements of absorption-emission pyrometry, but each set is taken over a different spectral interval that gives different weight to the radiation from a different portion of the optical path. Thereby, discrimination is obtained with respect to location along the path. A given radiometric error causes an error in computed temperatures. The ratio between temperature error and radiometric error depends on profile shape, path length, temperature level, and strength of line absorption, and the absorption coefficient and its temperature dependency. These influence the choice of wavelengths, for any given gas. Conditions for minimum temperature error are derived. Numerical results are presented for a two-wavelength measurement on a family of profiles that may be expected in a practical case of hydrogen-oxygen combustion. Under favorable conditions, the fractional error in temperature approximates the fractional error in radiant-flux measurement.
Buchele, D. R.↗