The rolling tire under load
Dynamic pressure distributions calculated for contact patch areas of elastically supported cylindrical shell used to model pneumatic tire
CYLINDRICAL SHELL↗
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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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Optimum secondary impulse for interplanetary transfer Technical note 64-21
Patched conic theory for optimum two-impulse velocity analysis on interplanetary vehicle transfer trajectory
ORBITAL VELOCITY↗
Orbital mechanics. I - Analytical treatment. II - Problems.
Orbital mechanics, examining problems relating to patched conics, perigee determination, eccentricity of satellite orbits and drag effect computations
SATELLITE ORBIT↗
Trajectory design for impulsive Earth-Mars- Earth trajectories launched in 1969 and 1971.
Trajectory design for spacecraft which returns in vicinity of earth after Mars encounter analyzed by patched conic model
PLANETARY SPACECRAFT↗
Liquid propulsion
Patch-type tests of ethylene-propylene rubber expulsion bladder material for thermal sterilization compatibility studies
Source record↗
Hot-cracking studies of Inconel 718 weld- heat-affected zones
Hot ductility tests, gas-tungsten-arc fillerless fusion tests, and circle patch-weld-restraint tests were conducted on Inconel 718 to better understand and correlate the weldability /resistance to hot cracking/ of the alloy. A correlation of the test results with composition, heat-treat condition, grain size, and microstructure was made.
Thompson, E. G.↗
Gage provides audible signal to facilitate checkout of connector pins
Commercial push gage has been modified to enable rapid, accurate testing of paddle pins in distributors, bullet pins and patch boards. The purpose of the gage is to ensure that the pins will not break electrical contact when they are subjected to a minimum, preset pressure.
Northern, B. J.↗
Spatial variations of the airglow in the area of lambda 5893 angstrom
Spatial distribution and emission intensity of luminescent patches in airglow
Nasyrov, G. A.↗
Overlapped conic simulation of three-body trajectories
Trajectory computation technique for three-body motion is based on analytical derivation and empirical validation of pseudostate theory. Application of technique yields ''overlapped conic'' trajectories with error magnitudes only 20 percent as great as those of patched conic trajectories.
Wilson, S. W., Jr.↗
Lunar trajectory geometry
Analysis of earth-moon trajectories using geometric approach and patched conic trajectory, graphs
Carlson, K. M.↗
Radiant cooling
Passive radiant cooler design involving patch cone radiative coupling calculation based on specular image technique
Annable, R. V.↗
Stored program concept for analog computers
Optimization of three-stage matrices, modularization, and black boxes design techniques provides for automatically interconnecting computing component inputs and outputs in general purpose analog computer. Design also produces relatively inexpensive and less complex automatic patching system.
Hannauer, G., III↗
The size and shape of Gum's nebula
The ionizing light of the supernova which produced the Gum nebula is now fossilized in the still live, though failing, H II region. The main body of the nebula suggests a hollow center or shell form, with a characteristic radius of about half the distance to the outlying fragments. The edges of the main body patches are typically sharp and often bright. The structure of the Gum nebula appears to be dependent on the event of ionization and possibly on the details of heating. It is not now an unstructured ambient medium, as it may have been before the recent ionization. Several hypotheses are presented for a structured ambient medium.
Johnson, H. M.↗
Analysis of selected deep space missions
Task 1 of the NEW MOONS (NASA Evaluation With Models of Optimized Nuclear Spacecraft) study is discussed. Included is an introduction to considerations of launch vehicles, spacecraft, spacecraft subsystems, and scientific objectives associated with precursory unmanned missions to Jupiter and thence out of the ecliptic plane, as well as other missions to Jupiter and other outer planets. Necessity for nuclear power systems is indicated. Trajectories are developed using patched conic and n-body computer techniques.
West, W. S.↗
Mare Imbrium lava flows and their relationship to color boundaries, part M
The Apollo 15 metric camera photography provided a number of spectacular views of most of the southern and central portions of the unique systems of major lava flows that stretch diagonally across Mare Imbrium from the general area of Euler Crater to a point east of Le Verrier Crater. A preliminary examination of the photographs indicates that the source of the material comprising the major flows is situated to the west of Euler Crater and south of the limits of the photographic coverage. The photographs also show clearly that most, if not all, the mare ridges included were formed after the solidification of the flows. Few color boundaries exist in the area of metric photography where the illumination angle is low enough to show the fronts of some of the very thin flows. However, patches of redder material lying northeast of Mt. Lahire are found to be enclosed by low flow fronts, confirming the theory that the redder material represents an earlier filling of the Imbrium basin.
Whitaker, E. A.↗
Observations of oceanic white caps for moderate to highwind speeds
A series of photographs of sea surface whitecap conditions for wind speeds of 10 to 25 m/sec was obtained and analyzed for areal coverage of white water. The results are in good agreement with semiempirical calculations based on the wind speed and the development of the wave spectrum only when the contribution of thin foam streaks oriented in the direction of the wind is neglected. Since both the actively forming whitecaps and the thin foam streaks contribute significantly to the microwave emissivity of the sea surface, it is important that the foam streaks be included in the theory but differentiated from large white caps and foam patches. A simple relationship that accounts for the foam streaks based on the rate of energy transfer, the wind speed, and the wave spectrum is proposed. By means of empirically derived constant terms for the microwave signatures of white caps and foam streaks, this theory was adapted to the prediction of the increase in brightness temperature due to foam, with reasonable results to wind speeds of 20 m/sec.
Ross, D. B.↗
The extrapolation of laboratory and aircraft radar sea return data to spacecraft altitudes
Laboratory measurements show that the spectra of capillary waves grow with wind speed over six orders of magnitude. The scatter in the data can be partially understood and predicted from a combination of turbulence theory, radar theory, and the small sample theory of statistical inference. When these results are applied to a prediction of the sea return values to be obtained by S193 on Skylab, it can be shown that the size of the illuminated patch effectively averages out the horizontal scales of gustiness, so that the measurement will correspond to the synoptic scale wind.
Pierson, W. J.↗
Midday auroral observations in the oval, cusp region, and polar cap.
Evaluation of combined photographic and photometric measurements made on the 1969 NASA airborne expedition, yielding a description of the midday oval, cusp region, and polar cap auroral precipitation at low magnetic activity (Kp = 0, 1+). The observations delineate three regions through the description of the type of aurora observed and the photometrically inferred change in energy of the particles: (1) the region in and equatorward of the oval where greater than 3-keV electrons are associated with 6300 A/4278 A ratios less than or equal to 1 and with a diffuse glow or structured arcs; (2) the cusp region where electrons of several hundred electron volts and spikes of more energetic electrons are associated with 6300 A/4278 A ratios between 10 and 35 in broken, fragmented, rayed features and patches; (3) the polar cap where discrete earth-sun-aligned arcs have height luminosity profiles in 5577 A, 6300 A (forbidden O I), and 4278 A (N2(+)) that suggest incoming electrons with an energy spectrum of 2-keV characteristic energy above a low-energy (few hundred electron volts) background.
Romick, G. J.↗