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  • 1
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    Advances and trends in the development of computational models for tires (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Status and some recent developments of computational models for tires are summarized. Discussion focuses on a number of aspects of tire modeling and analysis including: tire materials and their characterization; evolution of tire models; characteristics of effective finite element models for analyzing tires; analysis needs for tires; and impact of the advances made in finite element technology, computational algorithms, and new computing systems on tire modeling and analysis. An initial set of benchmark problems has been proposed in concert with the U.S. tire industry. Extensive sets of experimental data will be collected for these problems and used for evaluating and validating different tire models. Also, the new Aircraft Landing Dynamics Facility (ALDF) at NASA Langley Research Center is described.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 1-3,
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Technique for measuring side forces on a banked aircraft with a free-swiveling nose gear (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental investigation was conducted at the Langley Research Center to determine a method for towing an aircraft to measure the side forces of a free-swiveling nose gear due to variations in bank angle. A F-106 aircraft and the Space Shuttle orbiter OV-101 were towed to measure side forces on full-size aircraft for bank angles up to 3 deg. These tests indicate that substantial side forces will occur if an aircraft is rolling on a runway in a banked attitude even when the nose gear is free to swivel. Corotation of a twin-tire nose gear appears to cause a substantial increase in side force due to bank angle compared with a nose gear with indepdendently rotating wheels.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-87719 , L-16137 , NAS 1.15:87719
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Overview of NASA tire experimental programs (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ongoing aircraft tire experimental programs are reported. These programs are designed to measure profile growth due to inflation pressure and vertical loading, contact pressures in the tire footprint, and a number of tire mechanical properties including spring, damping, and relaxation characteristics.
    Keywords: STRUCTURAL MECHANICS
    Type: Tire Modeling; p 163-174
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Mixed Models and Reduction Techniques for Large-Rotation, Nonlinear Analysis of Shells of Revolution with Application to Tires (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An effective computational strategy is presented for the large-rotation, nonlinear axisymmetric analysis of shells of revolution. The three key elements of the computational strategy are: (1) use of mixed finite-element models with discontinuous stress resultants at the element interfaces; (2) substantial reduction in the total number of degrees of freedom through the use of a multiple-parameter reduction technique; and (3) reduction in the size of the analysis model through the decomposition of asymmetric loads into symmetric and antisymmetric components coupled with the use of the multiple-parameter reduction technique. The potential of the proposed computational strategy is discussed. Numerical results are presented to demonstrate the high accuracy of the mixed models developed and to show the potential of using the proposed computational strategy for the analysis of tires.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-2343 , L-15802 , NAS 1.60:2343
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Static and yawed-rolling mechanical properties of two type 7 aircraft tires (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Selected mechanical properties of 18 x 5.5 and 49 x 17 size, type 7 aircraft tires were evaluated. The tires were subjected to pure vertical loads and to combined vertical and lateral loads under both static and rolling conditions. Parameters for the static tests consisted of tire load in the vertical and lateral directions, and parameters for the rolling tests included tire vertical load, yaw angle, and ground speed. Effects of each of these parameters on the measured tire characteristics are discussed and, where possible, compared with previous work. Results indicate that dynamic tire properties under investigation were generally insensitive to speed variations and therefore tend to support the conclusion that many tire dynamic characteristics can be obtained from static and low speed rolling tests. Furthermore, many of the tire mechanical properties are in good agreement with empirical predictions based on earlier research.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-1863 , L-14125
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Tire Modeling (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The workshop was organized into six sessions dealing with finite element developments, applications to tire dynamic problems, solution techniques for tire contact problems, experimental data, tire thermal studies, and current design practices.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CP-2264 , L-15578 , NAS 1.55:2264 , Sep 07, 1982 - Sep 09, 1982; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Cornering characteristics of the nose-gear tire of the space shuttle orbiter (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental investigation was conducted to evaluate cornering characteristics of the 32 x 8.8 nose gear tire of the space shuttle orbiter. Data were obtained on a dry concrete runway at nominal ground speeds ranging from 50 to 100 knots and over a range of tire vertical loads and yaw angles which span the expected envelope of loads and yaw angles to be encountered during space shuttle landing operations. The cornering characteristics investigated included side and drag forces and friction coefficients, aligning and overturning torques, friction force moment arm, and the lateral center of pressure shift. Results of this investigation indicate that the cornering characteristics of the space shuttle nose gear tire are insensitive to variations in ground speed over the range tested. The effects on cornering characteristics of variations in the tire vertical load and yaw angle are as expected. Trends observed are consistent with trends observed during previous cornering tests involving other tire sizes.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-1917 , L-14681
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Temperature distribution in an aircraft tire at low ground speeds (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental study was conducted to define temperature profiles of 22 x 5.5, type 7, bias ply aircraft tires subjected to freely rolling, yawed rolling, and light braking conditions. Temperatures along the inner wall of freely rolling tires were greater than those near the outer surface. The effect of increasing tire deflection was to increase the temperature within the shoulder and sidewall areas of the tire carcass. The effect of cornering and braking was to increase the treat temperature. For taxi operations at fixed yaw angles, temperature profiles were not symmetric. Increasing the ground speed produced only moderate increases in tread temperature, whereas temperatures in the carcass shoulder and sidewall were essentially unaffected.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-2195 , L-15605 , NAS 1.60:2195
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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