Poisson equation on a sphere. II.
Interpolation of Poisson equation by method adjusting equations to insure existence of discrete solution
DISCRETE FUNCTION↗
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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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High-torque precision stepping drive
Stepping drive has been designed for precise incremental angular positioning of scale models of spacecraft about a horizontal axis in order to accurately measure antenna receiving and transmitting characteristics. Positioning is insured by spring-loaded, self-locking plungers.
Kaspareck, W. E.↗
Iris-leaf core retainer for a surface drill
Iris-leaf core retainer insures retention of a complete sample within the drill string. Individual overlapping leaves will not rupture or tear out when they come in contact with the oncoming core.
Olivari, H.↗
Diffusion approximations in collective risk theory
Collective risk theory concerned with random fluctuations of total assets of insurance company
Iglehart, D. L.↗
Fundamental problems of injector design
The principal control of the combustion within a liquid-propellant rocket thrust chamber is provided by the injector. Only when precise control of the injection process is attained can optimum performance, dynamic stability, heat transfer compatibility and reproducibility be provided. Control must be designed into each step of the injection process with sufficient isolation provided to insure stability. In the design of the injector manifolding, the main desire is to provide mass and mixture ratio regulation across the injector face. The design of the injector orifices must be such that this mass and mixture ratio control is retained through the orifices and imparted to the droplet sprays that are produced. Furthermore, the orifice design must control the size and distribution of the droplets generated so that combustion will be completed within the chamber. Mechanical damping devices are often required to protect the early mixing zone from transverse velocities and associated displacement effects in the chamber. Only when each phase of the injection process is carefully controlled can the design aims be reached.
David T Harrje↗
Hydraulic brake safety valve
Safety device, consisting of three separate fluid chambers, insures that two wheels of a brake system continue to function if a failure occurs.
Hobson, Z. A.↗
Fail-safe numerical control
System provides duplicate set of control logic circuitry. Comparators insure that the same data is present in both circuits. If any discrepancy is found, the machine is automatically stopped, before damage can occur.
Thompson, G. A.↗
Toroidal mirrors provide virtual walls for breaks in light pipes
Section of light pipe consists of separated segments having opposed toroidal mirrors that intercept meridional rays to present virtual wall in space between mirrors, thus insuring uninterrupted light transmission down the pipe. Design affords internal access to pipe section. Segments are electrically or thermally insulated from one another.
Young, N.↗
State variable feedback and nonlinear system synthesis
Popov type nonlinear control systems from synthesis viewpoint, using state variable feedback results to insure absolute stability
Herring, J. W.↗
On-line optimization of maintenance and verification schedules
On-line optimization of maintenance and verification schedules for complex system safety insurance
Meisel, W. S.↗
Rocket motor casing Patent
Regeneratively cooled rocket motor casing with tapered channels to insure minimum thicknesses at each channel cross section for necessary strength requirements
Baehr, E. F.↗
Dual solid cryogens for spacecraft refrigeration Patent
Dual solid cryogens for spacecraft refrigeration insuring low temperature cooling for extended periods
Caren, R. P.↗
Staging loads - Space vehicle design criteria
Analysis of loads produced on spacecraft by staging operations and practices to insure that staging loads are included in spacecraft design
Goldman, R. L.↗
Crack Growth of D6 Steel in Air and High Pressure Oxygen
Fracture and subcritical flaw growth characteristics were experimentally determined for electroless nickel plated D6 steel in dry air and high pressure oxygen environments as applicable to the Lunar Module/Environmental Control System (LM/ECS) descent gaseous oxygen (GOX) tank. The material tested included forgings, plate, and actual LM/ECS descent GOX tank material. Parent metal and TIG (tungsten inert gas) welds were tested. Tests indicate that proof testing the tanks at 4000 pounds per square inch or higher will insure safe operation at 3060 pounds per square inch. Although significant flaw growth can occur during proofing, subsequent growth of flaws during normal tank operation is negligible.
Bixler, W. D.↗
Lubricant selection for gear designers
Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
Townsend, D. P.↗
Rotary shutter mechanism contains optical elements
Two cylindrical shutter mechanisms having fixed outer sleeves and rotating inner sleeves use single stepping motor and Geneva mechanism to sequentially move optical components into path of ultraviolet monochromator for output control to photomultiplier. Photometric and wavelength calibration sources insure shutter positions according to operational phases.
Weilbach, A. O.↗
Tissue holder for experimental and Demonstration Surgery
Development of device for holding anatomical tissues during operations is discussed. Device consists of plastic dish with hemispherical recess in center to hold excised eyes. Low vacuum applied to underside of recess insures holding of part.
Kuchta, F. J.↗
Fill and vent quick disconnect
Hydraulic disconnect coupling on ground serving half of spacecraft refrigeration cooling system employs movable center stem for venting and closing nipple poppet. Self sealing poppet quickly connects cooling system to spacecraft without manual work. Recessed sealing surface insures open poppet when stem retracts.
Boerner, R. Y.↗