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  • Other Sources  (10)
  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)  (5)
  • STRUCTURAL MECHANICS  (3)
  • ASTROPHYSICS  (2)
  • 1985-1989  (10)
  • 1988  (10)
  • 1
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    On the universality of the two-point galaxy correlation function (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The behavior of the two-point galaxy correlation function in volume-limited subsamples of three complete redshift surveys is investigated. The correlation length is shown to scale approximately as the square root of the distance limit in both the CfA and Southern Sky catalogs, but to be independent of the distance limit in the IRAS sample. This effect is found to be due to factors such as the large positive density fluctuations in the foreground of the optically selected catalogs biasing the correlation length estimate downward, and the brightest galaxies appearing to be more strongly clustered than the mean.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 333; L9-L12
    Format: text
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  • 2
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    A method for determining crack opening load from load-displacement data (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The fatigue crack opening load is determined as the tangent point on the ascending load-displacement data between the curved portion and the upper linear region. A model for the 'unzipping' behavior of the crack indicates that the curved portion of the load-deflection curve is second order. The opening load is determined by a nonlinear, least squares fit of the data to the model, which optimally locates the tangent point of the two curves. The method provided consistent results for determining opening load P(op) for 7475-T731 aluminum using data from a crack tip opening gage.
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    A space crane concept: Preliminary design and static analysis (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Future in-space construction and assembly facilities will require the use of space cranes capable of supporting and manipulating large and massive loads. The large size of the space components being considered for construction will require that these cranes have a reach on the order of 100 meters. A space crane constructed from an erectable four-longeron truss beam with 19 5-sq-m truss bays is considered. This concept was selected to be compatible with the Space Station truss. This truss is hinged at three locations along its bottom edge and attached at one end to a rotary joint cantilevered to the assembly depot's main truss structure. The crane's boom sections are rotated by extensible longeron actuators located along the top edge of the beam. To achieve maximum position maneuvering capability for the crane requires that the individual sections be capable of rotating 180 degrees about the hinge point. This can only be accomplished by offsetting the hinges from the longeron axes. Since offset hinges introduce bending moments in the truss members, an analysis of the effect of hinge offsets on the load-carrying capacity of the structure is required. The objective of the static finite element analysis described is to determine the effect of various offset lengths on the overall bending stiffness of the crane and on the maximum stresses.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-101498 , NAS 1.15:101498
    Format: application/pdf
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  • 4
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    Shuttle Orbiter arrestment system studies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Scale model studies of the Shuttle Orbiter arrestment system were conducted to determine the proper net arrestment system configuration to bring the Orbiter to a safe stop in the event of a runway overshoot. Areas of interest include the effect of various net geometries on net engagement of the nose gear and main gear; and whether or not the top bundle contacts the crew cabin window. The model tests indicated that the net arrestment system was properly designed to bring the Orbiter to a safe stop with minimal amount of damage. The test procedures and data are presented.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: SAE PAPER 881361
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  • 5
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    Research in particle and gamma-ray astrophysics (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research activities in cosmic rays, gamma rays, and astrophysical plasmas are covered. Each activity is described, followed by a bibliography. The research program is directed toward the investigation of the astrophysical aspects of cosmic rays and gamma rays and of the radiation and electromagnetic field environment of the earth and other planets. These investigations were performed by means of energetic particle and photon detector systems flown on spacecraft and balloons.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-183126 , NAS 1.26:183126
    Format: application/pdf
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  • 6
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    The use of force feedback control for robotic mating of umbilical fuel lines (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Control problems in developing force feedback control to use in remotely connecting, disconnecting, and reconnecting the umbilical fuel lines of the Space Shuttle Vehicle are discussed. A docking protocol is proposed, indicating the required role of force feedback. The use of active force feedback control is examined and performance requirements and experimental results are given. A single degree-of-freedom force feedback model is presented and the application of classical control compensation techniques to the force control loop to increase flexibility is considered. In addition, possible modifications to the controller and plans for future research are discussed.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Space Congress; Apr 26, 1988 - Apr 29, 1988; Cocoa Beach, FL; United States
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  • 7
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    Systems integration for the Kennedy Space Center (KSC) Robotics Applications Development Laboratory (RADL) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laboratory for developing robotics technology for hazardous and repetitive Shuttle and payload processing activities is discussed. An overview of the computer hardware and software responsible for integrating the laboratory systems is given. The center's anthropomorphic robot is placed on a track allowing it to be moved to different stations. Various aspects of the laboratory equipment are described, including industrial robot arm control, smart systems integration, the supervisory computer, programmable process controller, real-time tracking controller, image processing hardware, and control display graphics. Topics of research include: automated loading and unloading of hypergolics for space vehicles and payloads; the use of mobile robotics for security, fire fighting, and hazardous spill operations; nondestructive testing for SRB joint and seal verification; Shuttle Orbiter radiator damage inspection; and Orbiter contour measurements. The possibility of expanding the laboratory in the future is examined.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Space Congress; Apr 26, 1988 - Apr 29, 1988; Cocoa Beach, FL; United States
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  • 8
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    Direct solution for thermal stresses in a nose cap under an arbitrary axisymmetric temperature distribution (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design of a nose cap for a hypersonic vehicle is an iterative process requiring a rapid, easy to use and accurate stress analysis. The objective of this paper is to develop such a stress analysis technique from a direct solution of the thermal stress equations for a spherical shell. The nose cap structure is treated as a thin spherical shell with an axisymmetric temperature distribution. The governing differential equations are solved by expressing the stress solution to the thermoelastic equations in terms of a series of derivatives of the Legendre polynomials. The process of finding the coefficients for the series solution in terms of the temperature distribution is generalized by expressing the temperature along the shell and through the thickness as a polynomial in the spherical angle coordinate. Under this generalization the orthogonality property of the Legendre polynomials leads to a sequence of integrals involving powers of the spherical shell coordinate times the derivative of the Legendre polynomials. The coefficients of the temperature polynomial appear outside of these integrals. Thus, the integrals are evaluated only once and their values tabulated for use with any arbitrary polynomial temperature distribution.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 88-2247 , Structures, Structural Dynamics and Materials Conference; Apr 18, 1988 - Apr 20, 1988; Williamsburg, VA; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Space Shuttle solid rocket motor testing for return to flight (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Significant design changes made to major components of the NASA Space Shuttle SRM are summarized. The extent of changes made in the nozzle-to-case joint to better protect the joint O-ring seals is indicated schematically as are changes made to the motor nozzle. It is noted that the use of subscale, full scale/short duration burn hardware tests to provide data for structural and thermal analytical models was necessary.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Aerospace Testing Seminar; Oct 11, 1988 - Oct 13, 1988; Manhattan Beach, CA; United States
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  • 10
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    Launch vehicle operations cost reduction through artificial intelligence techniques (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASA's Kennedy Space Center has attempted to develop AI methods in order to reduce the cost of launch vehicle ground operations as well as to improve the reliability and safety of such operations. Attention is presently given to cost savings estimates for systems involving launch vehicle firing-room software and hardware real-time diagnostics, as well as the nature of configuration control and the real-time autonomous diagnostics of launch-processing systems by these means. Intelligent launch decisions and intelligent weather forecasting are additional applications of AI being considered.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: AIAA PAPER 88-4734 , AIAA/SOLE Space Logistics Symposium; Oct 03, 1988 - Oct 05, 1988; Costa Mesa, CA; United States
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