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  • Other Sources  (8)
  • ELECTRONIC SYSTEMS  (3)
  • FLUID MECHANICS AND HEAT TRANSFER  (2)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (2)
  • Aerospace Medicine
  • Chemical Engineering
  • 2005-2009
  • 1990-1994  (8)
  • 1970-1974
  • 1994  (8)
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  • 2005-2009
  • 1990-1994  (8)
  • 1970-1974
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  • 1
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    A magnetic shield/dual purpose mission (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objective of this work is to design, build, and fly a dual-purpose payload whose function is to produce a large volume, low intensity magnetic field and to test the concept of using such a magnetic field to protect manned spacecraft against particle radiation. An additional mission objective is to study the effect of this moving field on upper atmosphere plasmas. Both mission objectives appear to be capable of being tested using the same superconducting coil. The potential benefits of this magnetic shield concept apply directly to both earth-orbital and interplanetary missions. This payload would be a first step in assessing the true potential of large volume magnetic fields in the U.S. space program. Either converted launch systems or piggyback payload opportunities may be appropriate for this mission. The use of superconducting coils for magnetic shielding against solar flare radiation during manned interplanetary missions has long been contemplated and was considered in detail in the years preceding the Apollo mission. With the advent of new superconductors, it has now become realistic to reconsider this concept for a Mars mission. Even in near-earth orbits, large volume magnetic fields produced using conventional metallic superconductors allow novel plasma physics experiments to be contemplated. Both deployed field-coil and non-deployed field-coil shielding arrangements have been investigated, with the latter being most suitable for an initial test payload in a polar orbit.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-197192 , NAS 1.26:197192
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Influence of cross-flow on nonlinear Tollmien-Schlichting/vortex interaction (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The transition of an incompressible three-dimensional boundary layer with strong cross-flow is considered theoretically and computationally in the context of vortex/wave interactions. Specifically the work centers on two lower-branch Tollmien-Schlichting waves which mutually interact nonlinearly to induce a longitudinal vortex flow. The vortex motion in turn gives rise to significant wave modulation via wall-shear forcing. The characteristic Reynolds number is large and, as a consequence, the waves' and the vortex motion are governed primarily by triple deck theory. The nonlinear interaction is captured by a viscous partial-differential system for the vortex coupled with a pair of amplitude equations for each wave pressure. Following analysis and computation over a wide range of parameters, three distinct responses are found to emerge in the nonlinear behavior of the flow solution downstream: an algebraic finite-distance singularity, far-downstream saturation or far-downstream wave decay leaving pure vortex flow. These depend on the input conditions, the wave angles and the size of the cross flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Royal Society (London) Proceedings, Series A - Mathematical and Physical Sciences (ISSN 0962-8444); 446; 1927; p. 319-340
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Phase segregation due to simultaneous migration and coalescence (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Ground-based modeling and experiments have been performed on the interaction and coalescence of drops leading to macroscopic phase separation. The focus has been on gravity-induced motion, with research also initiated on thermocapillary motion of drops. The drop size distribution initially shifts toward larger drops with time due to coalescence, and then a back towards smaller drops due to the larger preferentially settling out. As a consequence, the phase separation rate initially increases with time and then decreases.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center, Second Microgravity Fluid Physics Conference; p 101-106
    Format: application/pdf
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  • 4
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    Development of the CSI phase-3 evolutionary model testbed (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report documents the development effort for the reconfiguration of the Controls-Structures Integration (CSI) Evolutionary Model (CEM) Phase-2 testbed into the CEM Phase-3 configuration. This step responds to the need to develop and test CSI technologies associated with typical planned earth science and remote sensing platforms. The primary objective of the CEM Phase-3 ground testbed is to simulate the overall on-orbit dynamic behavior of the EOS AM-1 spacecraft. Key elements of the objective include approximating the low-frequency appendage dynamic interaction of EOS AM-1, allowing for the changeout of components, and simulating the free-free on-orbit environment using an advanced suspension system. The fundamentals of appendage dynamic interaction are reviewed. A new version of the multiple scaling method is used to design the testbed to have the full-scale geometry and dynamics of the EOS AM-1 spacecraft, but at one-tenth the weight. The testbed design is discussed, along with the testing of the solar array, high gain antenna, and strut components. Analytical performance comparisons show that the CEM Phase-3 testbed simulates the EOS AM-1 spacecraft with good fidelity for the important parameters of interest.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-4630 , LMSC/P086632 , NAS 1.26:4630
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Optoelectronic Tool Measures Steps And Gaps Between Tiles (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Optoelectronic tool measures gaps between tiles and steps between faces of tiles. Eliminates need for difficult, tedious, time-consuming, and error-prone manual measurements. Automates measurements of steps and gaps to within 0.006 in. and records data automatically. Developed for inspecting thermal-insulation tiles on Space Shuttle. Adaptable to inspection of any other settings where steps and gaps critical.
    Keywords: ELECTRONIC SYSTEMS
    Type: KSC-11583 , Laser Tech. Brief.; 2; 3; P. 78
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Locomotion in a rotating space station: a synthesis of new data with established concepts (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Despite technical problems associated with designing a rotating space station it is still thought that such a device may provide a more tolerable work environment and prevent some of the physiological changes that currently pose a threat to long-duration space missions. In the present analysis four case studies are presented and the results show that centrifugal and Coriolis effects could hinder one's ability to walk or run in a natural way in such an environment. In a rotating station that has a nominal 'G-level' equal to that on earth it can be shown that a person running at 3.8 m s -1 could experience foot 'heaviness' effects that range from 1 to 3 g and fore-aft foot 'forces' that range fom -0.5 to +0.5 g. In contrast the hip region could sense a relatively constant 'force' equal to 2 g. With regard to the body as a whole there would be 'weight changes' that depended on the direction of gait. While these conditions imply that locomotion in a rotating space station would be different from normal gait, it is likely that given sufficient training, astronauts could learn optimal strategies to account for centrifugal and Coriolis effects on individual body segments. The learning process would also entail developing strategies on which route to take when moving from one location to another, since in many cases the shortest route would not be the least energy consuming. Such training would be justified if it were shown that artificial gravity was an effective countermeasure to the problems of muscle atrophy and bone loss.
    Keywords: Aerospace Medicine
    Type: Gait & posture (ISSN 0966-6362); 2; 157-65
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Computing Plasma Interactions Of A Spacecraft (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASCAP/LEO (NASA Spacecraft Charging Analyzer Program for Low Earth Orbit) implements collection of mathematical models and algorithms designed to study electrostatic interaction between cold, dense plasma and spacecraft surfaces. Computes variety of electrostatic, plasma, and flow effects. Appropriate for conditions in which temperature of plasma small in comparison with spacecraft-generated potentials and Debye screening length short in comparison with dimensions of spacecraft. Related NASCAP/GEO (LEW-12973) code (NASA Charging Analyzer Program for Geosynchronous Orbit, denoted as NASCAP) appropriate for conditions which spacecraft differential potentials result from interactions with hot plasma and Debye screening length larger than dimensions of spacecraft. Object-definition portion of NASCAP/GEO code provided as part of package. NASCAP/LEO written in FORTRAN 77 and C language.
    Keywords: ELECTRONIC SYSTEMS
    Type: LEW-15641 , NASA Tech Briefs (ISSN 0145-319X); 18; 11; P. 81
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  • 8
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    Fast, Massively Parallel Data Processors (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed fast, massively parallel data processor contains 8x16 array of processing elements with efficient interconnection scheme and options for flexible local control. Processing elements communicate with each other on "X" interconnection grid with external memory via high-capacity input/output bus. This approach to conditional operation nearly doubles speed of various arithmetic operations.
    Keywords: ELECTRONIC SYSTEMS
    Type: GSC-13304 , NASA Tech Briefs (ISSN 0145-319X); 18; 8; P. 18
    Format: text
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