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  • Other Sources  (4)
  • 1975-1979  (4)
  • 1
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    The imaging photopolarimeter experiment on Pioneer 11 (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: For 2 weeks continuous imaging, photometry, and polarimetry observations were made of Jupiter and the Galilean satellites in red and blue light from Pioneer 11. Measurements of Jupiter's north and south polar regions were possible because the spacecraft trajectory was highly inclined to the planet's equatorial plane. One of the highest resolution images obtained is presented here along with a comparison of a sample of our photometric and polarimetric data with a simple model. The data seem consistent with increased molecular scattering at high latitudes.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; May 2
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Application of a novel finite difference method to dynamic crack problems (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A versatile finite difference method (HEMP and HEMP 3D computer programs) was developed originally for solving dynamic problems in continuum mechanics. It was extended to analyze the stress field around cracks in a solid with finite geometry subjected to dynamic loads and to simulate numerically the dynamic fracture phenomena with success. This method is an explicit finite difference method applied to the Lagrangian formulation of the equations of continuum mechanics in two and three space dimensions and time. The calculational grid moves with the material and in this way it gives a more detailed description of the physics of the problem than the Eulerian formulation.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 227-238
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Indirect synthesis of multidegree-of-freedom transient systems (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The indirect synthesis method is developed and shown to be capable of leading a near-optimal design of multidegree-of-freedom and multidesign-element transient nonlinear dynamical systems. The basis of the approach is to select the open design parameters such that the response of the portion of the system being designed approximates the limiting performances solution. The limiting performance problem can be formulated as one of linear programming by replacing all portions of the system subject to transient disturbances by control forces and supposing that the remaining portions are linear as are the overall kinematic constraints. One then selects the design parameters that respond most closely to the limiting performance solution, which can be achieved by unconstrained curve-fitting techniques.
    Keywords: CYBERNETICS
    Type: Journal of Optimization Theory and Applications; 20; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Use of General Purpose Computer Programs to Derive Equations of Motion for Optimal Isolation Studies (1975)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Techniques were developed that utilize general purpose structural analysis computer programs to generate the equations of motion necessary for limiting performance studies. The methodology necessary to couple available general purpose finite element structural programs to a limiting performance capability was developed. Primary emphasis was given to the use of the general purpose program to develop equations of motion in a form that can be used by the limiting performance program.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-144990 , ESS-4085-112-75
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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