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  • Weitere Quellen  (15)
  • 1970-1974  (14)
  • 1960-1964  (1)
  • 1920-1924
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  • 1
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    Heat flow experiment (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: 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.
    Schlagwort(e): SPACE SCIENCES
    Materialart: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 23 p
    Format: text
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  • 2
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    Lunar heat flow measurement Preliminary report (1964)
    In:  CASI
    Details
    Publikationsdatum: 2006-10-26
    Beschreibung: Determination of lunar interior heat flux, and surface material thermal properties
    Schlagwort(e): SPACE SCIENCES
    Format: text
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  • 3
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    Lunar thermal measurements in conjunction with Project Apollo (1973)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: 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.
    Schlagwort(e): SPACE SCIENCES
    Materialart: NASA-CR-136035
    Format: application/pdf
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  • 4
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    Preliminary measurements on heat balance in pneumatic tires (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: 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.
    Schlagwort(e): THERMODYNAMICS AND COMBUSTION
    Materialart: NASA-CR-121239 , REPT-036390-2-T
    Format: application/pdf
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  • 5
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    An evaluation of string theory for the prediction of dynamic tire properties using scale model aircraft tires (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The string theory was evaluated for predicting lateral tire dynamic properties as obtained from scaled model tests. The experimental data and string theory predictions are in generally good agreement using lateral stiffness and relaxation length values obtained from the static or slowly rolling tire. The results indicate that lateral forces and self-aligning torques are linearly proportional to tire lateral stiffness and to the amplitude of either steer or lateral displacement. In addition, the results show that the ratio of input excitation frequency to road speed is the proper independent variable by which frequency should be measured.
    Schlagwort(e): AIRCRAFT
    Materialart: NASA-CR-2058 , REPT-056080-18-T
    Format: application/pdf
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  • 6
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    Structural modeling of aircraft tires (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: 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.
    Schlagwort(e): AIRCRAFT
    Materialart: NASA-CR-2220 , REPT-05608-16-T-REV
    Format: application/pdf
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  • 7
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    An evaluation of string theory for the prediction of dynamic tire properties using scale model aircraft tires (1971)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Tire shimmy calculations for scale model aircraft tires
    Schlagwort(e): AIRCRAFT
    Materialart: NASA-CR-112007 , REPT-056080-18-T , TR-12
    Format: application/pdf
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  • 8
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    Testing techniques for determining static mechanical properties of Pneumatic tires (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Fore-aft, lateral, and vertical spring rates of model and full-scale pneumatic tires were evaluated by testing techniques generally employed by industry and various testing groups. The purpose of this experimental program was to investigate what effects the different testing techniques have on the measured values of these important static tire mechanical properties. The testing techniques included both incremental and continuous loadings applied at various rates over half, full, and repeated cycles. Of the three properties evaluated, the fore-aft stiffness was demonstrated to be the most affected by the different testing techniques used to obtain it. Appreciable differences in the fore-aft spring rates occurred using both the increment- and continuous-loading techniques; however, the most significant effect was attributed to variations in the size of the fore-aft force loop. The dependence of lateral stiffness values on testing techniques followed the same trends as that for fore-aft stiffness, except to a lesser degree. Vertical stiffness values were found to be nearly independent of testing procedures if the nonlinear portion of the vertical force-deflection curves is avoided.
    Schlagwort(e): AIRCRAFT
    Materialart: NASA-CR-2412 , REPT-056080-20-T
    Format: application/pdf
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  • 9
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    High friction interactive aircraft tire-runway systems (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The principle of utilizing geometric interaction between runway asperities and tire pattern design is discussed, and a theoretical basis is presented for substantial enhancement of frictional effects by this process. Test data confirming this is given. First order analytical expressions are given for the increased friction coefficients and for the engagement distances required. High speed friction data on a 7.00 x 8 aircraft tire is presented confirming this. Example design geometries are shown for the tire tread groove pattern, and designs and materials are discussed for the asperity grid and its attachment system.
    Schlagwort(e): AIRCRAFT
    Materialart: AIAA PAPER 74-967 , Aircraft Design, Flight Test and Operations Meeting; Aug 12, 1974 - Aug 14, 1974; Los Angeles, CA
    Format: text
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  • 10
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    Dynamic properties of aircraft tires (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A research program has investigated the use of the von Schlippe string-type tire model for predicting the dynamic behavior of aircraft tires. The transfer-function method was used for theory evaluation. A more flexible two-constant modification to the string theory tire model is presented. Experiments were conducted on four types of scale model aircraft tires. Two types were of conventional bias construction, one type was an isotropic toroid, and one type was of unbelted radial construction. The conventional string theory and model gave predictions that were in good agreement with experimental data for bias constructed tires. The two-constant modification to string theory provided better agreement between predictions and experiment for the unconventional tires. The results indicate that the string theory tire model using static and slow-rolling tire properties predicts dynamic aircraft tire properties that have the same trends as the measured dynamic properties and, in most cases, provides good quantitative agreement.
    Schlagwort(e): AIRCRAFT
    Materialart: Journal of Aircraft; 11; Mar. 197
    Format: text
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