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  • 1
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    Mod-2 Wind Turbine Loads Test Correlations (1986)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1986-02-01
    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 for different sites, to measure vortex generator effects, and to evaluate rotational sampling techniques. This paper presents the results of these tests and assesses the adequacy of prediction techniques.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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    PAPER CURRENT
  • 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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    NASA TECHNICAL REPORTS
  • 3
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    Thin film concentrator panel development (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The development and testing of a rigid panel concept that utilizes a thin film reflective surface for application to a low-cost point-focusing solar concentrator is discussed. It is shown that a thin film reflective surface is acceptable for use on solar concentrators, including 1500 F applications. Additionally, it is shown that a formed steel sheet substrate is a good choice for concentrator panels. The panel has good optical properties, acceptable forming tolerances, environmentally resistant substrate and stiffeners, and adaptability to low to mass production rates. Computer simulations of the concentrator optics were run using the selected reflector panel design. Experimentally determined values for reflector surface specularity and reflectivity along with dimensional data were used in the analysis. The simulations provided intercept factor and net energy into the aperture as a function of aperture size for different surface errors and pointing errors. Point source and Sun source optical tests were also performed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 25-34
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Air Brayton Solar Receiver, phase 1 (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A six month analysis and conceptual design study of an open cycle Air Brayton Solar Receiver (ABSR) for use on a tracking, parabolic solar concentrator are discussed. The ABSR, which includes a buffer storage system, is designed to provide inlet air to a power conversion unit. Parametric analyses, conceptual design, interface requirements, and production cost estimates are described. The design features were optimized to yield a zero maintenance, low cost, high efficiency concept that will provide a 30 year operational life.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169081 , NAS 1.26:169081
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Receiver For Solar Air Turbine (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Solar receiver heats air to temperature high enough to drive gas turbine. Receiver has thermal output of about 70 kilowatts. Pointing downward at focal position of solar reflector, proposed receiver accepts intense concentrated sunlight. Although temperatures in receiver may rise to 1,500 degrees F (816 degrees C) or more, calculations show receiver loses less than 10 percent of insolation by convection through aperture. Receiver designed for 30-year life without scheduled maintenance or replacement.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-15124 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 343
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Space vehicle integrated thermal protection/structural/meteoroid protection system, volume 2 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see .
    Keywords: SPACE VEHICLES
    Type: NASA-CR-121104 , D180-15172-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Space vehicle integrated thermal protection/structural/meteoroid protection system, volume 1 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A program was conducted to determine the merit of a combined structure/thermal meteoroid protection system for a cryogenic vehicle propulsion module. Structural concepts were evaluated to identify least weight designs. Thermal analyses determined optimum tank arrangements and insulation materials. Meteoroid penetration experiments provided data for design of protection systems. Preliminary designs were made and compared on the basis of payload capability. Thermal performance tests demonstrated heat transfer rates typical for the selected design. Meteoroid impact tests verified the protection characteristics. A mockup was made to demonstrate protection system installation. The best design found combined multilayer insulation with a truss structure vehicle body. The multilayer served as the thermal/meteoroid protection system.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-121103 , D180-15172-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Wind loads on flat plate photovoltaic array fields (nonsteady winds) (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Techniques to predict the dynamic response and the structural dynamic loads of flat plate photovoltaic arrays due to wind turbulence were analyzed. Guidelines for use in predicting the turbulent portion of the wind loading on future similar arrays are presented. The dynamic response and the loads dynamic magnification factor of the two array configurations are similar. The magnification factors at a mid chord and outer chord location on the array illustrated and at four points on the chord are shown. The wind tunnel test experimental rms pressure coefficient on which magnification factors are based is shown. It is found that the largest response and dynamic magnification factor occur at a mid chord location on an array and near the trailing edge. A technique employing these magnification factors and the wind tunnel test rms fluctuating pressure coefficients to calculate design pressure loads due to wind turbulence is presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-164745 , DOE/JPL-954833-81/4 , JPL-9950-594
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Wind loads on flat plate photovoltaic array fields (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an experimental analysis (boundary layer wind tunnel test) of the aerodynamic forces resulting from winds acting on flat plate photovoltaic arrays are presented. Local pressure coefficient distributions and normal force coefficients on the arrays are shown and compared to theoretical results. Parameters that were varied when determining the aerodynamic forces included tilt angle, array separation, ground clearance, protective wind barriers, and the effect of the wind velocity profile. Recommended design wind forces and pressures are presented, which envelop the test results for winds perpendicular to the array's longitudinal axis. This wind direction produces the maximum wind loads on the arrays except at the array edge where oblique winds produce larger edge pressure loads. The arrays located at the outer boundary of an array field have a protective influence on the interior arrays of the field. A significant decrease of the array wind loads were recorded in the wind tunnel test on array panels located behind a fence and/or interior to the array field compared to the arrays on the boundary and unprotected from the wind. The magnitude of this decrease was the same whether caused by a fence or upwind arrays.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-164454 , DOE/JPL-954833-81/3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Lightweight evacuated multilayer insulation systems for the space shuttle vehicle (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The elements in the evacuated multilayer insulation system were investigated, and the major weight contributors for optimization selected. Outgassing tests were conducted on candidate vacuum jacket materials and experiments were conducted to determine the vacuum and structural integrity of selected vacuum jacket configurations. A nondestructive proof test method, applicable to externally pressurized shells, was validated on this program.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-121105 , D180-15171
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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