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  • Weitere Quellen  (192)
  • SPACE VEHICLES  (108)
  • STRUCTURAL MECHANICS  (45)
  • MACHINE ELEMENTS AND PROCESSES  (39)
  • 1970-1974  (192)
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  • 1
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    Status of reusable surface insulation thermal protection system technology programs (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The development of three low-density rigidized insulation materials for the shuttle TPS application is reported. These materials consist of one high purity silica system and two systems based on mullite, an aluminum silicate. Both systems consist of fibers joined together with appropriate binders to obtain a rigidized insulation composite. Both material systems require the application of a glassy coating to provide a wear resistant, high emittance surface and to prevent the absorption of water by the fiber matrix. The technology program has addressed the development of water impervious coatings, methods of assembling the materials in design concepts while minimizing the thermal stress in the insulation, achieving compatibility between the RSI material and the structural system, and test evaluations to demonstrate the feasibility of the surface insulation concept.
    Schlagwort(e): SPACE VEHICLES
    Materialart: NASA Space Shuttle Technol. Conf.; p 435-474
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Orbital propellant depot system. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Review of some of the problems involved in the design of a long-term propellant storage depot in earth orbit to act as a resupply station for cargo/personnel shuttles between earth orbit and lunar orbit, between low earth orbit and synchronous orbit, and possibly for use with interplanetary probes. The problems discussed pertain essentially to the long-term storage and propellant transfer capabilities.
    Schlagwort(e): SPACE VEHICLES
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    A non-linear dynamic lumped-parameter model of a rectangular plate. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A lumped-parameter model of a rectangular plate is developed by assuming fundamental mode solutions and using Hamilton's Principle and the Euler equations to set up the differential equation of motion for the system. The plate theory used may be described as the dynamic analogue of the von Karman large-deflection theory. Four sets of symmetrical boundary conditions are considered with the restriction of uniform pressure dynamic loads. The model takes the form of a mass on a cubic-hardening spring with each term defined by algebraic expressions of the plate parameters. The results for some specific problems are compared with two previous solutions. This method is less accurate but simpler to develop and apply.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Sound and Vibration; 21; Apr. 8
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    A comparison of the capabilities of three finite element programs (1972)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Three finite element programs are compared to assess their capabilities as an analysis tool in a structural design process. Because of the need for repetitive analyses as an integral part of a design loop, a candidate program must be capable of handling large problems, operate efficiently, and be readily adaptable for use in computer-aided design. The three programs considered in the study, ELAS,SNAP, and NASTRAN, range from a relatively small finite element program limited to static structural analysis (ELAS) to a large complex general analysis system (NASTRAN). Results are given for comparative speeds and computer resources required for each program in the analysis of sample fuselage problems representative of practical aircraft design.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 277-287
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Experiences in interfacing NASTRAN with another finite element program (1972)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The coupling of NASTRAN to another finite element program developed for the static analysis of automotive structures is discussed. The two programs were coupled together to use the substructuring capability of the in-house program and the normal mode analysis capability of NASTRAN. Modifications were made to the NASTRAN program in order to make the coupling feasible.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 111-119
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    The computation of optimal control programmes using a modified successive sweep method. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A second-order method for numerically solving control optimization problems has been developed. The method, referred to as the modified sweep method (MSM), differs from the successive sweep method (SSM) proposed by McReynolds and Bryson (1965) in that the conditions for local control optimality are used to determine the control as an explicit function of the state variables and time. The control is eliminated from the problem and the solution to the resulting two-point boundary value problem can be obtained by linear perturbation methods. The modified sweep method proposed here uncouples the perturbation equations for the state variables and the Lagrange multipliers by using a generalized matrix-Riccati transformation of variables. The resulting algorithm for the numerical iteration process is concerned with determining the initial values of a set of Lagrange multipliers rather than correcting a numerical control programme over the entire time interval of interest.
    Schlagwort(e): SPACE VEHICLES
    Materialart: International Journal of Control; vol. 15
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Cometary Explorer to Grigg-Skjellerup 1977 (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The mission analysis and technical summary of the spacecraft and its subsystems are presented for an Explorer flight to investigate the solar wind interaction with the Grigg-Skjellerup coma. The basic spacecraft system is the same as Explorer 43 and 47, and the mission characteristics which distinguish this mission from previous IMP missions are discussed. The physical and chemical characteristics of the comet's nucleus and coma are described, and the spacecraft trajectory and scientific payloads required to study the solar wind-cometary atmospheric interaction are considered.
    Schlagwort(e): SPACE VEHICLES
    Materialart: NASA-TM-X-66023 , X-690-72-337
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Synthesis of shuttle vehicle damping using substructure test results (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An empirical method is developed for predicting the modal damping of a combined parallel-stage shuttle model by means of damping measurements performed on the individual substructures. Correlations are first determined for each component in terms of damping energy as a function of peak kinetic energy and modal amplitude. The results are then used to predict component damping energies corresponding to the respective kinetic energies and amplitudes that occur for the new modes of the combined system. Modal characteristics for the system, other than damping, are obtained by a real eigenvalue solution of dynamic equations developed by Hurty's procedure of substructures. System equations, which include component modal damping, are also solved by a complex eigenvalue approach for comparison with results of the empirical method.
    Schlagwort(e): SPACE VEHICLES
    Materialart: NASA-CR-123791
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Coupling between structure and liquids in a parallel stage space shuttle design (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A study was conducted to determine the influence of liquid propellants on the dynamic loads for space shuttle vehicles. A parallel-stage configuration model was designed and tested to determine the influence of liquid propellants on coupled natural modes. A forty degree-of-freedom analytical model was also developed for predicting these modes. Currently available analytical models were used to represent the liquid contributions, even though coupled longitudinal and lateral motions are present in such a complex structure. Agreement between the results was found in the lower few modes.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-127631 , AIAA PAPER 72-347-REV
    Format: application/pdf
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  • 10
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    User's manual for the Simulated Life Analysis of Vehicle Elements (SLAVE) model (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The simulated life analysis of vehicle elements model was designed to perform statistical simulation studies for any constant loss rate. The outputs of the model consist of the total number of stages required, stages successfully completing their lifetime, and average stage flight life. This report contains a complete description of the model. Users' instructions and interpretation of input and output data are presented such that a user with little or no prior programming knowledge can successfully implement the program.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-123642 , ASD-ASTN-1519
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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