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  • 1
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    A CALCULATIONAL PROCEDURE FOR ESTIMATING SPACE RADIATION EXPOSURE DURING LUNAR MISSIONS (1962)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Estimation of space radiation exposure during lunar mission - spacecraft shielding
    Keywords: STRUCTURAL MECHANICS
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of measured and calculated dynamic loads for the Mod-2 2.5 mW wind turbine system (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Boeing Company, under contract to the Electric Power Research Institute (EPRI), has completed a test program on the Mod-2 wind turbines at Goodnoe Hills, Washington. The objectives were to update fatigue load spectra, discern site and machine differences, measure vortex generator effects, and to evaluate rotational sampling techniques. This paper shows the test setup and loads instrumentation, loads data comparisons and test/analysis correlations. Test data are correlated with DYLOSAT predictions using both the NASA interim turbulence model and rotationally sampled winds as inputs. The latter is demonstrated to have the potential to improve the test/analysis correlations. The paper concludes with an assessment of the importance of vortex generators, site dependence, and machine differences on fatigue loads. The adequacy of prediction techniques used are evaluated and recommendations are made for improvements to the methodology.
    Keywords: STRUCTURAL MECHANICS
    Type: DASCON Engineering, Collected Papers on Wind Turbine Technology; p 139-152
    Format: application/pdf
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  • 3
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    Theoretical analysis of HVAC duct hanger systems (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Several methods are presented which, together, may be used in the analysis of duct hanger systems over a wide range of frequencies. The finite element method (FEM) and component mode synthesis (CMS) method are used for low- to mid-frequency range computations and have been shown to yield reasonably close results. The statistical energy analysis (SEA) method yields predictions which agree with the CMS results for the 800 to 1000 Hz range provided that a sufficient number of modes participate. The CMS approach has been shown to yield valuable insight into the mid-frequency range of the analysis. It has been demonstrated that it is possible to conduct an analysis of a duct/hanger system in a cost-effective way for a wide frequency range, using several methods which overlap for several frequency bands.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC, 15th NASTRAN (R) Users' Colloquium; p 222-249
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  • 4
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    International solar polar mission (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The key configurations and characteristics of the two International Solar Polar Mission (ISPM) spacecraft are described. The primary mission objectives of the ISPM are to investigate, as a function of solar latitude, the properties of the solar corona, the solar wind, the sun/wind interface, the heliospheric magnetic field, solar and nonsolar cosmic rays, and the interstellar/interplanetary neutral gas and dust. In addition, instrumentation is included to detect the gamma ray bursts; it is hoped to pinpoint the sources of these bursts by using triangulation from each spacecraft and the Earth.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: The Telecommun. and Data Acquisition Rept.; p 62-67
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  • 5
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    Bending strength of large thin-walled pressure- stabilized cylinder beyond onset of compressive skin wrinkling. (1966)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Ultimate bending moment capability of thin walled pressure stabilized cylinder with typical axial loads demonstrated to be 50 percent greater than bending moment at which compressive wrinkling occurs
    Keywords: STRUCTURAL MECHANICS
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  • 6
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    Finite element analysis of partly wrinkled membranes (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a nonlinear numerical algorithm for the analysis of stresses and displacements in partly wrinkled flat membranes, and its implementation on the SAP VII finite-element code are described. A comparison of numerical results with exact solutions of two benchmark problems reveals excellent agreement, with good convergence of the required iterative procedure. An exact solution of a problem involving axisymmetric deformations of a partly wrinkled shallow curved membrane is also reported.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 1-3; 631-639
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  • 7
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    Telecommunications and data acquisition support for the Pioneer Venus Project: Pioneers 12 and 13, prelaunch through March 1984 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The support provided by the Telecommunications and Data Acquisition organization of the Jet Propulsion Laboratory (JPL) to the Pioneer Venus missions is described. The missions were the responsibility of the Ames Research Center (ARC). The Pioneer 13 mission and its spacecraft design presented one of the greatest challenges to the Deep Space Network (DSN) in the implementation and operation of new capabilities. The four probes that were to enter the atmosphere of Venus were turned on shortly before arrival at Venus, and the DSN had to acquire each of these probes in order to recover the telemetry being transmitted. Furthermore, a science experiment involving these probes descending through the atmosphere required a completed new data type to be generated at the ground stations. This new data type is known as the differential very long baseline interferometry. Discussions between ARC and JPL of the implementation requirements involved trade-offs in spacecraft design and led to a very successful return of science data. Specific implementation and operational techniques are discussed, not only for the prime mission, but also for the extended support to the Pioneer 12 spacecraft (in orbit around Venus) with its science instruments including that for radar observations of the planet.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-173893 , JPL-PUB-84-43 , NAS 1.26:173893
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  • 8
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    Finite element analysis of wrinkling membranes (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a nonlinear numerical algorithm for the analysis of stresses and displacements in partly wrinkled flat membranes, and its implementation on the SAP VII finite-element code are described. A comparison of numerical results with exact solutions of two benchmark problems reveals excellent agreement, with good convergence of the required iterative procedure. An exact solution of a problem involving axisymmetric deformations of a partly wrinkled shallow curved membrane is also reported.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-172325 , NAS 1.26:172325 , USC-CE-83-05
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  • 9
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    Buckling analysis for structural sections and stiffened plates reinforced with laminated composites. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A classical buckling analysis is developed for stiffened, flat plates composed of a series of linked flat plate and beam elements. Plates are idealized as multilayered orthotropic elements; structural beads and lips are idealized as beams. The loaded edges of the stiffened plate are simply supported and the conditions at the unloaded edges can be prescribed arbitrarily. The plate and beam elements are matched along their common junctions for displacement continuity and force equilibrium in an exact manner. Offsets between elements are considered in the analysis. Buckling under uniaxial compressive load for plates, sections and stiffened plates is investigated. Buckling loads are found as the lowest of all possible general and local failure modes and the mode shape is used to determine whether buckling is a local or general instability. Numerical correlations with existing analysis and test data for plates, sections and stiffened plates including boron-reinforced structures are discussed. In general, correlations are reasonably good.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Solids and Structures; 8; Mar. 197
    Format: text
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  • 10
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    Construction and assembly of large space structures (1980)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Three aspects of the construction and assembly of large space structures, namely transportation costs, human productivity in space and the source of materials (lunar vs terrestrial), are considered. Studies on human productivity have been so encouraging that the cost of human labor is now regarded as much less important than transportation costs. It is pointed out that these costs, although high, are extremely demand-sensitive. Even with high demand, however, the construction of several large systems would warrant the use of lunar materials and space manufacturing. The importance of further research is stressed in order to establish the optimum tradeoff between automation and manual assembly.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IAF PAPER 80-A-37 , International Astronautical Congress; Sept. 22-28, 1980; Tokyo; Japan
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