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  • Other Sources  (4)
  • 1970-1974  (4)
  • 1960-1964
  • 1920-1924
  • 1973  (4)
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  • 1970-1974  (4)
  • 1960-1964
  • 1920-1924
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  • 1
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    Unknown
    Lunar thermal measurements in conjunction with Project Apollo (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Problems related to the feasibility of measuring lunar heat flow at the lunar surface are analyzed, and the findings which required that a drill be developed for lunar use are discussed. Numerical simulations were made of the in situ measurement of lunar thermal conductivity using a circular ring source of heat. The results of these simulations formed the basis for the criteria used in designing a subsurface thermal probe for ALSEP. Preliminary analyses are presented on the data obtained from the Apollo 15 and 17 missions.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-136035
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Preliminary measurements on heat balance in pneumatic tires (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A variety of tests was undertaken to determine the nature of heat generation associated with a pneumatic tire operating under various conditions. Tests were conducted to determine the magnitude and distribution of internally generated heat caused by hysteresis in the rubber and ply fabric in an automobile tire operating under conditions of load, pressure, and velocity representative of normal operating conditions. These included tests at various yaw angles and tests with braking applied. In other tests, temperature sensors were mounted on a road to measure the effect of a tire rolling over and an attempt was made to deduce the magnitude and nature of interfacial friction from the resulting information. In addition, tests were performed using the scratch plate technique to determine the nature of the motion between the tire and road. Finally, a model tire was tested on a roadwheel, the surface covering which could be changed, and an optical pyrometer was used to measure rubber surface temperatures.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-CR-121239 , REPT-036390-2-T
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Structural modeling of aircraft tires (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A theoretical and experimental investigation of the feasibility of determining the mechanical properties of aircraft tires from small-scale model tires was accomplished. The theoretical results indicate that the macroscopic static and dynamic mechanical properties of aircraft tires can be accurately determined from the scale model tires although the microscopic and thermal properties of aircraft tires can not. The experimental investigation was conducted on a scale model of a 40 x 12, 14 ply rated, type 7 aircraft tire with a scaling factor of 8.65. The experimental results indicate that the scale model tire exhibited the same static mechanical properties as the prototype tire when compared on a dimensionless basis. The structural modeling concept discussed in this report is believed to be exact for mechanical properties of aircraft tires under static, rolling, and transient conditions.
    Keywords: AIRCRAFT
    Type: NASA-CR-2220 , REPT-05608-16-T-REV
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    A study of the dynamic tire properties over a range of tire constructions (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The dynamic properties of four model aircraft tires of various construction were evaluated experimentally and compared with available theory. The experimental investigation consisted of measuring the cornering force and the self-aligning torque developed by the tires undergoing sinusoidal steering inputs while operating on a small scale, road-wheel tire testing apparatus. The force and moment data from the different tires are compared with both finite- and point-contact patch string theory predictions. In general, agreement between finite contact patch theory and experimental observation is good. A modified string theory is also presented in which coefficients for cornering force and self-aligning torque are determined separately. This theory improves the correspondence between the experimental and analytical data, particularly on tires with relatively high self-aligning torques.
    Keywords: AIRCRAFT
    Type: NASA-CR-2219 , REPT-056080-19-T-REV
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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