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  • 1
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    ISE structural dynamic experiments (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The topics are presented in viewgraph form and include the following: directed energy systems - vibration issue; Neutral Particle Beam Integrated Space Experiment (NPB-ISE) opportunity/study objective; vibration sources/study plan; NPB-ISE spacecraft configuration; baseline slew analysis and results; modal contributions; fundamental pitch mode; vibration reduction approaches; peak residual vibration; NPB-ISE spacecraft slew experiment; goodbye ISE - hello Zenith Star Program.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: JPL, Model Determination for Large Space Systems Workshop, Volume 2; p 524-557
    Format: text
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  • 2
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    Heat flow experiment (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The heat flow experiment installed on the lunar surface during the Apollo 15 flight is described. Subjects discussed are: (1) the experiment concept and design, (2) the operations of the experiment, (3) the employment of the experiment on the lunar surface at Hadley Rille site, (4) subsurface lunar temperatures, and (5) extrapolation of sensor temperatures to equilibrium values. Graphs of the data obtained from the experiment are provided.
    Keywords: SPACE SCIENCES
    Type: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 23 p
    Format: text
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  • 3
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    Lunar heat flow measurement Preliminary report (1964)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Determination of lunar interior heat flux, and surface material thermal properties
    Keywords: SPACE SCIENCES
    Format: text
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  • 4
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    Heat generation in aircraft tires (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A method was developed for calculating the internal temperature distribution in an aircraft tire while free rolling under load. The method uses an approximate stress analysis of each point in the tire as it rolls through the contact patch, and from this stress change the mechanical work done on each volume element may be obtained and converted into a heat release rate through a knowledge of material characteristics. The tire cross-section is then considered as a body with internal heat generation, and the diffusion equation is solved numerically with appropriate boundary conditions of the wheel and runway surface. Comparison with data obtained with buried thermocouples in tires shows good agreement.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Computers and Structures (ISSN 0045-7949); 20; 1-3,; 535-544
    Format: text
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  • 5
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    Satellite magnetic anomalies over subduction zones - The Aleutian Arc anomaly (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Positive magnetic anomalies seen in MAGSAT average scalar anomaly data overlying some subduction zones can be explained in terms of the magnetization contrast between the cold subducted oceanic slab and the surrounding hotter, nonmagnetic mantle. Three-dimensional modeling studies show that peak anomaly amplitude and location depend on slab length and dip. A model for the Aleutian Arc anomaly matches the general trend of the observed MAGSAT anomaly if a slab thickness of 7 km and a relatively high (induced plus viscous) magnetization contrast of 4 A/m are used. A second source body along the present day continental margin is required to match the observed anomaly in detail, and may be modeled as a relic slab from subduction prior to 60 m.y. ago.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Geophysical Research Letters (ISSN 0094-8276); 12; 41-44
    Format: text
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  • 6
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    Current Research in Aircraft Tire Design and Performance (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A review of the tire research programs which address the various needs identified by landing gear designers and airplane users is presented. The experimental programs are designed to increase tire tread lifetimes, relate static and dynamic tire properties, establish the tire hydroplaning spin up speed, study gear response to tire failures, and define tire temperature profiles during taxi, braking, and cornering operations. The analytical programs are aimed at providing insights into the mechanisms of heat generation in rolling tires and developing the tools necessary to streamline the tire design process and to aid in the analysis of landing gear problems.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: The 1980 Aircraft Safety and Operating Probl., Pt. 2; p 543-553
    Format: application/pdf
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  • 7
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    Non-linear cord-rubber composites (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method is presented for calculating the stress-strain relations in a multi-layer composite made up of materials whose individual stress-strain characteristics are non-linear and possibly different. The method is applied to the case of asymmetric tubes in tension, and comparisons with experimentally measured data are given.
    Keywords: COMPOSITE MATERIALS
    Type: SAE PAPER 892339
    Format: text
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  • 8
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    Composite theory applied to elastomers (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Reinforced elastomers form the basis for most of the structural or load carrying applications of rubber products. Computer based structural analysis in the form of finite element codes was highly successful in refining structural design in both isotropic materials and rigid composites. This has lead the rubber industry to attempt to make use of such techniques in the design of structural cord-rubber composites. While such efforts appear promising, they were not easy to achieve for several reasons. Among these is a distinct lack of a clearly defined set of material property descriptors suitable for computer analysis. There are substantial differences between conventional steel, aluminum, or even rigid composites such as graphite-epoxy, and textile-cord reinforced rubber. These differences which are both conceptual and practical are discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-180322 , NAS 1.26:180322
    Format: application/pdf
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  • 9
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    Heat generation in aircraft tires (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A method was developed for calculating the internal temperature distribution in an aircraft tire while free rolling under load. The method uses an approximate stress analysis of each point in the tire as it rolls through the contact patch, and from this stress change the mechanical work done on each volume element may be obtained and converted into a heat release rate through a knowledge of material characteristics. The tire cross-section is then considered as a body with internal heat generation, and the diffusion equation is solved numerically with appropriate boundary conditions of the wheel and runway surface. Comparison with data obtained with buried thermocouples in tires shows good agreement.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Tire Modeling; p 193-210
    Format: application/pdf
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  • 10
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    The rolling tire under load (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Dynamic pressure distributions calculated for contact patch areas of elastically supported cylindrical shell used to model pneumatic tire
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-69998
    Format: application/pdf
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