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  • Other Sources  (31)
  • EARTH RESOURCES AND REMOTE SENSING  (14)
  • STRUCTURAL MECHANICS  (9)
  • Aerodynamics  (8)
  • 2005-2009  (7)
  • 1985-1989  (24)
  • 11
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    Digital data from shuttle photography: The effects of platform variables (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Two major criticisms of using Shuttle hand held photography as an Earth science sensor are that it is nondigital, nonquantitative and that it has inconsistent platform characteristics, e.g., variable look angles, especially as compared to remote sensing satellites such as LANDSAT and SPOT. However, these criticisms are assumptions and have not been systematically investigated. The spectral effects of off-nadir views of hand held photography from the Shuttle and their role in interpretation of lava flow morphology on the island of Hawaii are studied. Digitization of photography at JSC and use of LIPS image analysis software in obtaining data is discussed. Preliminary interpretative results of one flow are given. Most of the time was spent in developing procedures and overcoming equipment problems. Preliminary data are satisfactory for detailed analysis.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Lyndon B.; NASA. Lyndon B. John
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    MAST flight system dynamic performance (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The MAST Flight System as a test bed for large space structure control algorithms is discussed. An overview is given of the control system architecture. The actuators, the sensors, the control computer, and the baseline damping algorithm are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA(DOD Control)Structures Interaction Technology, 1986; p 281-298
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Buckling tests of a 10 foot diameter stiffened cylinder with rectangular cutouts (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 10-foot diameter aluminum cylinder with rectangular cutouts in its ring and stringer stiffened wall was loaded to failure by an end bending moment. A 24x27 inch cutout, centered on the compression side of the shell, was first cut into the cylinder. After testing, the cutout area was enlarged to a 36/36 inch square cutout that removed the material damaged by buckling during the first test. After the second buckling test, the cutout area was patched with an equivalent stiffness plate bolted over the cutout hole. The cylinder was rotated 120 deg. and a 18x18 inch square hole cut into the center of the new compression side of the shell. Test specimen details, test procedures, and test results are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-88996 , NAS 1.15:88996
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Effects of aerosols and surface shadowing on bidirectional reflectance measurements of deserts (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Desert surfaces are probably one of the most stable of the Earth's natural targets for remote sensing. The bidirectional reflectance properties of the Saudi Arabian desert was investigated during the Summer Monsoon Experiment (Summer Monex). A comparison of high-altitude with near-surface measurements of the White Sands desert showed significant differences. These discrepancies have been attributed to forward scattering of the dust-laden atmosphere prevalent during Summer Monex. This paper is concerned in general with modeling the effects of atmospheric aerosols and surface shadowing on the remote sensing of bidirectional reflectance factors of desert targets, and in particular with comparing the results of these models with flight results. Although it is possible to approximate the latter, it is felt that a surface reflectance model with a smaller specular component would have permitted using a more realistic set of atmospheric conditions in the simulations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TP-2756 , L-16327 , NAS 1.60:2756
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  • 15
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    LANDSAT-D investigations in snow hydrology (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Work undertaken during the contract and its results are described. Many of the results from this investigation are available in journal or conference proceedings literature - published, accepted for publication, or submitted for publication. For these the reference and the abstract are given. Those results that have not yet been submitted separately for publication are described in detail. Accomplishments during the contract period are summarized as follows: (1) analysis of the snow reflectance characteristics of the LANDSAT Thematic Mapper, including spectral suitability, dynamic range, and spectral resolution; (2) development of a variety of atmospheric models for use with LANDSAT Thematic Mapper data. These include a simple but fast two-stream approximation for inhomogeneous atmospheres over irregular surfaces, and a doubling model for calculation of the angular distribution of spectral radiance at any level in an plane-parallel atmosphere; (3) incorporation of digital elevation data into the atmospheric models and into the analysis of the satellite data; and (4) textural analysis of the spatial distribution of snow cover.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E86-10007 , NASA-CR-176379 , NAS 1.26:176379
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  • 16
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    Analysis and test of superplastically formed titanium hat-stiffened panels under compression (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Four hat-stiffened titanium panels with two different stiffener configurations were fabricated by superplastic forming/weld brazing and tested under a moderately heavy compressive load. The panels had the same overall dimensions but differed in the shape of the hat-stiffener webs; three panels had stiffeners with flat webs and the other panel had stiffeners with beaded webs. Analysis indicated that the local buckling strain of the flat stiffener web was considerably lower than the general panel buckling strain or cap buckling strain. The analysis also showed that beading the webs of the hat stiffeners removed them as the critical element for local buckling and improved the buckling strain of the panels. The analytical extensional stiffness and failure loads compared very well with experimental results.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-88989 , NAS 1.15:88989
    Format: application/pdf
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  • 17
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    A space crane concept: Preliminary design and static analysis (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Future in-space construction and assembly facilities will require the use of space cranes capable of supporting and manipulating large and massive loads. The large size of the space components being considered for construction will require that these cranes have a reach on the order of 100 meters. A space crane constructed from an erectable four-longeron truss beam with 19 5-sq-m truss bays is considered. This concept was selected to be compatible with the Space Station truss. This truss is hinged at three locations along its bottom edge and attached at one end to a rotary joint cantilevered to the assembly depot's main truss structure. The crane's boom sections are rotated by extensible longeron actuators located along the top edge of the beam. To achieve maximum position maneuvering capability for the crane requires that the individual sections be capable of rotating 180 degrees about the hinge point. This can only be accomplished by offsetting the hinges from the longeron axes. Since offset hinges introduce bending moments in the truss members, an analysis of the effect of hinge offsets on the load-carrying capacity of the structure is required. The objective of the static finite element analysis described is to determine the effect of various offset lengths on the overall bending stiffness of the crane and on the maximum stresses.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-101498 , NAS 1.15:101498
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  • 18
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    Joint design for improved fatigue life of diffusion-bonded box-stiffened panels (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Simple photoelastic models were used to identify a cross-section geometry that would eliminate the severe stress concentrations at the bond line between box stiffeners diffusion bonded to a panel skin. Experimental fatigue-test data from titanium test specimens quantified the allowable stress in terms of cycle life for various joint geometries. It is shown that the effect of stress concentration is reduced and an acceptable fatigue life is achieved.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-2480 , L-15967 , NAS 1.60:2480
    Format: application/pdf
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  • 19
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    Spectral reflectances of natural targets for use in remote sensing studies (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A collection of spectral reflectances of 156 natural targets is presented in a uniform format. For each target both a graphical plot and a digital tabulation of reflectance is given. The data were taken from the literature and include laboratory, field, and aircraft measurements. A discussion of the different measurements of reflectance is given, along with the changes in apparent reflectance when targets are viewed through the atmosphere. The salient features of the reflectance curves of common target types are presented and discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-RP-1139 , L-15920 , NAS 1.61:1139
    Format: application/pdf
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  • 20
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    The correspondence of surface climate parameters with satellite and terrain data (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One of the goals of the research was to develop a ground sampling stragegy for calibrating remotely sensed measurements of surface climate parameters. The initial sampling strategy involved the stratification of the terrain based on important ancillary surface variables such as slope, exposure, insolation, geology, drainage, fire history, etc. For a spatially heterogeneous population, sampling error is reduced and efficiency increased by stratification of the landscape into more homogeneous sub-areas and by employing periodic random spacing of samples. These concepts were applied in the initial stratification of the study site for the purpose of locating and allocating instrumentation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-181515 , NAS 1.26:181515
    Format: application/pdf
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