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  • 1985-1989  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Correlation of acid gas-ethanolamine equilibrium using ionic concentrations (1987)
    New York, NY : Wiley-Blackwell
    Plant/Operations Progress 6 (1987), S. 112-117 
    Details
    ISSN: 0278-4513
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experimental equilibrium measurements are modeled using a Davies-like ionic strength correction term for the reaction equilibrium constants. Calculated and experimental results are in much better agreement when the ionic strength correction terms are used.
    Additional Material: 19 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prsb.720060213
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Dynamic characteristics of two 300 kW class dual keel space station concepts (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results from an investigation of the dynamic behavior of a 300 kW class solar dynamic powered, dual kell space station are presented. The purpose of the investigation was to determine and assess the influence of space station truss bay size on station controllability during rigid body attitude adjustment and orbit reboost maneuvers. The dual keel space station concept is defined and two finite element models (one which has a truss bay size of 5m and another with a truss bay size of 9 feet) are described. Rigid and flexible body characteristics of the two space station models are also presented. Finally, results from a transient response analysis, where the stations are subjected to an orbit reboost maneuver, are summarized.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-87680 , NAS 1.15:87680
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Control/structures interaction study of two 300 KW dual-keel space station concepts (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an investigation of the influence of structural stiffness of the space station framework on the controllability of two 300 kw class, solar dynamic powered, dual-keel space station designs are presented. The two design concepts differed only in the truss bay dimensions of the structural framework of the stations. Two control studies were made: (1) A study of the interaction of the framework structural response with the reaction control system used for attitude control during an orbital reboost maneuver; and (2) A study of the stability of the space station attitude control system with sensors influenced by the elastic deformations of the station framework. Although both configurations had acceptable control characteristics, the configuration with the larger truss bay dimension and its increased structural stiffness had more attractive characteristics for pointing control of the solar dynamic system during reboost and for attitude control during normal in-orbit operations.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-87679 , NAS 1.15:87679
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Multidisciplinary capability for analysis of the dynamics and control of flexible space structures (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper describes a computerized data distribution capability, IMAT, in place at the NASA Langley Research Center for the multidisciplinary analysis of the dynamics and control of large flexible space structures. The paper includes results obtained in using IMAT to investigate the influence of the structural response of the space station framework on the control of a 300kw class, solar-dynamic-powered, dual-keel space station during an orbital reboost maneuver. The method of control, using an unfiltered proportional-plus-differential control law, led to a stable control system even with local flexible response measured at the control sensor location included as a part of the control error signal. The flexible response at the outboard solar dynamic system sun-line axis was close to the maximum rotation allowed for efficient operation; thus, active local control of each solar dynamic system may be necessary to limit sun-line axis rotations effectively during a reboost maneuver.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-0961
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Deployable-erectable trade study for space station truss structures (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of a trade study on truss structures for constructing the space station are presented. Although this study was conducted for the reference gravity gradient space station, the results are generally applicable to other configurations. The four truss approaches for constructing the space station considered in this paper were the 9 foot single fold deployable, the 15 foot erectable, the 10 foot double fold tetrahedral, and the 15 foot PACTRUSS. The primary rational for considering a 9 foot single-fold deployable truss (9 foot is the largest uncollapsed cross-section that will fit in the Shuttle cargo bay) is that of ease of initial on-orbit construction and preintegration of utility lines and subsystems. The primary rational for considering the 15 foot erectable truss is that the truss bay size will accommodate Shuttle size payloads and growth of the initial station in any dimension is a simple extension of the initial construction process. The primary rational for considering the double-fold 10 foot tetrahedral truss is that a relatively large amount of truss structure can be deployed from a single Shuttle flight to provide a large number of nodal attachments which present a pegboard for attaching a wide variety of payloads. The 15 foot double-fold PACTRUSS was developed to incorporate the best features of the erectable truss and the tetrahedral truss.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-87573 , NAS 1.15:87573
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Compression-Failure Mechanisms in Composite Laminates (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Failure mechanisms observed using transparent fiberglass/epoxy birefringent materials. Technique based on use of transparent fiberglass/epoxy birefringent material. Transparency allows visual observation of location of initial laminate failure and of subsequent failure propagation; birefringence allows laminate stress distribution to be observed during test and also after test if permanent residual stresses occur. Nondestructive technique developed to observe failure as it develops and as propagates within laminate.
    Keywords: MATERIALS
    Type: LAR-13345 , NASA Tech Briefs (ISSN 0145-319X); 10; 2; P. 80
    Format: text
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    NASA TECHNICAL REPORTS
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