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  • 1
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    New considerations for pogo prevention on space shuttle (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Recommendations for improving the methodology of pogo suppression for the space shuttle include: Consideration of inter-pump location for accumulator or active device, inclusion of tank outflow effects in dynamic structural analysis, the use of simplified transfer functions in systems studies, three phase dynamic testing program for turbopump with development of dynamic flowmeters, and the use of a linearized mathematical model for engine physics studies.
    Keywords: SPACE VEHICLES
    Type: NASA, Washington NASA Space Shuttle Technol. Conf.; p 97-116
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Prevention of coupled structure-propulsion instability /POGO/ on the space shuttle (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Coupled structure-propulsion system instability /POGO/ prevention on space shuttle
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 249-262
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The STAR /self-testing and repairing/ computer - An investigation of the theory and practice of fault-tolerant computer design. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This paper presents the results obtained in a continuing investigation of fault-tolerant computing which is being conducted at the Jet Propulsion Laboratory. Initial studies led to the decision to design and construct an experimental computer with dynamic (standby) redundancy, including replaceable subsystems and a program rollback provision to eliminate transient errors. This system, called the STAR computer, began operation in 1969. The following aspects of the STAR system are described: architecture, reliability analysis, software, automatic maintenance of peripheral systems, and adaptation to serve as the central computer of an outer-planet exploration spacecraft.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Computers; C-20; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Electric field hysteresis effects in cholesteric liquid crystals (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Room temperature cholesteric liquid crystals retention of information on past electric field excitation by changes in optical transmission properties
    Keywords: PHYSICS, SOLID-STATE
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Calcification and the ground substance - Precipitation of calcium phosphate crystals from a nutrient gel (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Calcium phosphate crystals precipitation from nutrient gel to determine role of gelatinous ground substance in calcification
    Keywords: CHEMISTRY
    Type: ; UGREVUE(
    Format: text
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  • 6
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    Kinetic principles of interaction of components in complex biological systems (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A biomathematical analysis of component interaction in biological systems is given. Two primary types of systems are discussed - open systems and closed systems. The applicability of these systems to life support equipment in spacecraft is analyzed and formulae are provided to demonstrate the effect (theoretical) of closed and open systems in life support systems.
    Keywords: BIOSCIENCES
    Type: Probl. of Space Biol., Vol. 19 (NASA-TT-F-761); p 173-278
    Format: text
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  • 7
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    Static and Dynamic Analysis, F-14A Boron Horizontal Stabilizer (1971)
    In:  CASI
    Details
    Publication Date: 2014-09-03
    Description: NASTRAN application to static stress and dynamic modal problems of horizontal stabilizer of F-14A aircraft
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users Experiences; p 251-264
    Format: text
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  • 8
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    Applications of space teleoperator technology to the problems of the handicapped (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The identification of feasible and practical applications of space teleoperator technology for the problems of the handicapped were studied. A teleoperator system is defined by NASA as a remotely controlled, cybernetic, man-machine system designed to extend and augment man's sensory, manipulative, and locomotive capabilities. Based on a consideration of teleoperator systems, the scope of the study was limited to an investigation of these handicapped persons limited in sensory, manipulative, and locomotive capabilities. If the technology being developed for teleoperators has any direct application, it must be in these functional areas. Feasible and practical applications of teleoperator technology for the problems of the handicapped are described, and design criteria are presented with each application. A development plan is established to bring the application to the point of use.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-133357
    Format: application/pdf
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  • 9
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    Pogo suppression on space shuttle - early studies (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary studies for pogo prevention on the shuttle vehicle are reported. The importance of the effect of oscillatory outflow from a hydroelastic tank is displayed in terms of excitation of normal modes for a structure containing that tank assuming its outlet is closed. Evaluation of an approximate propulsion frequency response at undamped feedline resonance reveals the conditions for which the contribution of tank outflow is destabilizing and also provides a criterion for identifying those structural modes which are of potential significance for system stability. Various finite-element and normal-mode models for hydraulic feedlines are evaluated relative to accuracy of admittances of a long line. A procedure is recommended for modeling a feed system to minimize the required number of second-order equations. Specific recommendations are made for the analytical estimation of pump cavitation compliance and a first estimate for the shuttle pumps is given. Weakness in past practices of pump testing are identified and a new three-phase program is proposed. Finally results of numerical studies on the early vehicle configuration are presented. It is concluded that an accumulator between the boost and main pump offers promise of higher effectiveness than one at the engine inlet.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-2210
    Format: application/pdf
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  • 10
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    Active Suppression of Pogo on the Space Shuttle (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The use of active pogo suppressors on the space shuttle was qualitatively investigated. Suppressor design concepts and the effectiveness of these designs in maintaining the stability of the shuttle vehicle were the primary concerns. Suppressor design concepts were developed by means of a series of parametric stability analyses. These two designs together with two designs provided by NASA were evaluated in detail for control effectiveness, performance relative to a passive suppression device, sensitivity of performance to feedback error, suppressor volume flow requirements, and suppressor development requirements. An active device at the high pressure oxidizer pump inlet was shown to provide a simple and effective design that is insensitive to error in the feedback signal. The sizing of an active suppressor was demonstrated to be dependent upon knowledge of the dynamic characteristics of the system.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-134749 , ATR-75(7428)-1
    Format: application/pdf
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