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  • Other Sources  (9)
  • 2015-2019
  • 1980-1984  (6)
  • 1975-1979  (3)
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  • 1
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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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    NASA TECHNICAL REPORTS
  • 2
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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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    NASA TECHNICAL REPORTS
  • 3
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    Heat generation in aircraft tires under braked rolling conditions (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analytical model was developed to approximate the internal temperature distribution in an aircraft tire operating under conditions of unyawed braked rolling. The model employs an array of elements to represent the tire cross section and considers the heat generated within the tire to be caused by the change in strain energy associated with cyclic tire deflection. The additional heating due to tire slip and stresses induced by braking are superimposed on the previously developed free rolling model. An extensive experimental program was conducted to verify temperatures predicted from the analytical model. Data from these tests were compared with calculations over a range of operating conditions. The model results were in reasonably good agreement with measured values.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-3768 , NAS 1.26:3768
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A comparison of some static and dynamic mechanical properties of 18 x 5.5 and 49 x 17 type 7 aircraft tires as measured by three test facilities (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The properties were measured during static, slow rolling, and high-speed tests, and comparisons were made between data as acquired on indoor drum dynamometers and on an outdoor test track. In addition, mechanical properties were also obtained from scale model tires and compared with corresponding properties from full-size tires. While the tests covered a wide range of tire properties, results seem to indicate that speed effects are not large, scale models may be used for obtaining some but not all tire properties, and that predictive equations developed in NASA TR R-64 are still useful in estimating most mechanical properties.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-165720
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Heat generation in aircraft tires under free rolling conditions (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    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: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-3629 , NAS 1.26:3629
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Heat generation in aircraft tires under free rolling conditions (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Effort is directed toward construction of a rational method for evaluating internal temperatures of aircraft tires. Enhanced predictability of tire temperature buildup is a design tool in both the tire and airframe industries.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-164273
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Accretional capture of the moon (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The effectiveness of accretional capture is studied with the aid of a simple model involving a small secondary body in a hyperbolic orbit which approaches a large primary body. When the separation is a minimum, the mass of the primary body increases. An investigation is conducted regarding the conditions under which this change in mass will result in an elliptic orbit with capture.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 258; Nov. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The non-homogeneous accumulation model for terrestrial planet formation and the consequences for the atmosphere of Venus (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The nonhomogeneous-accumulation model for the formation of the terrestrial planets is described, and its consequences for the formation of the Venusian atmosphere are assayed in the context of our knowledge of the composition of the earth and carbonaceous chondrites. The relative abundances of the low-temperature condensibles in the reservoirs at the earth's surface are applied to Venus. Although carbonaceous chondrites show similar properties for the chemically bound elements, they show large deficiencies for the rare gases. The major gases on Venus, by volume, are predicted to be 98.12% CO2, 1.86% N2 and 0.02% Ar-40.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Definition of Tire Properties Required for Landing System Analysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The data bank constructed provided two basic advantages for the user of aircraft tire information. First, computerization of the data bank allowed mechanical property data to be stored, corrected, updated, and revised quickly and easily as more reliable tests and measurements were carried out. Secondly, the format of the book which can be printed from the computerized data bank can be easily adjusted to suit the needs of the users without the great expense normally associated with reprinting and editing books set by ordinary typography.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-CR-156171 , UMICH-012881
    Format: application/pdf
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