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  • Other Sources  (8)
  • 1990-1994  (8)
  • 1985-1989
  • 1965-1969
  • 1935-1939
  • 1990  (8)
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  • 1990-1994  (8)
  • 1985-1989
  • 1965-1969
  • 1935-1939
Year
  • 1
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    A fast recursive algorithm for the discrete sine transform (1990)
    In:  IEEE Trans. on Signal Processing, Bonn, Inst. f. Theoret. Geodäsie, vol. 38, no. 11, pp. 553-556, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1990
    Keywords: Transformations ; Filter-
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Simulation and analysis of a delta planform with multiple jets in ground effect (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The three-dimensional, thin-layer Navier-Stokes equations on a body-conforming, overset, multiple-grid topology are solved in the present numerical simulations of the flow around a 60-deg delta-planform wing equipped with two thrust-reverser jets in ground-effect conditions. Such experimentally flow-visualized features as jet-deformation and ground vertex-formation are captured by these simulations; the loss of wing-borne lift due to the 'suck-down' phenomenon, which arises as the delta planform flies at low speeds in close proximity to the ground, is also well simulated.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-0299
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Genetic-evolution-based optimization methods for engineering design (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper presents the applicability of a biological model, based on genetic evolution, for engineering design optimization. Algorithms embodying the ideas of reproduction, crossover, and mutation are developed and applied to solve different types of structural optimization problems. Both continuous and discrete variable optimization problems are solved. A two-bay truss for maximum fundamental frequency is considered to demonstrate the continuous variable case. The selection of locations of actuators in an actively controlled structure, for minimum energy dissipation, is considered to illustrate the discrete variable case.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA. Langley Research Center, The Third Air Force(NASA Symposium on Recent Advances in Multidisciplinary Analysis and Optimization; p 318-323
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    NASA TECHNICAL REPORTS
  • 4
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    Integrated imaging experiment with C-SAR and other geological image data across the Nelson Front, Northern Manitoba (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents preliminary results from the integration of geophysical and geological data sets using Bayesian statistical analysis with the purpose of mapping the Churchill-Superior Boundary zone. In the Wabowden area the contribution of each rock type to the aeromagnetic anomaly is judged by convolving the aeromagnetic anomaly value with the average magnetic susceptibility. The 'a posteriori' probabilities of significant patterns in the new data are then computed. The highest 'a posteriori' probability occurs along a narrow corridor whose trend coincides remarkably with the location of the Churchill-Superior Boundary Zone. In the Wekusko Lake area, C-SAR and TM data were integrated using an image analysis system. Here the emphasis is on mapping of geological structures.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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    NASA TECHNICAL REPORTS
  • 5
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    An improved method to determine vibration damping of materials and structural components (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present, improved frequency-domain technique for vibration-damping estimation involves the fitting of a 'best curve' for the measured frequency-response data near a resonance by means of a least-squares error criterion. The damping ratio and the undamped natural frequency are then computed using the coefficients of the rational fraction polynomial that had been determined on the basis of the curve-fitting technique. Attention is given to the results of this method's application to damping measurements for graphite-reinforced epoxy composites. The results obtained are superior to those of the 'half-power points' method.
    Keywords: STRUCTURAL MECHANICS
    Type: International Congress on Recent Developments in Air and Structure-Borne Sound and Vibration; Mar 06, 1990 - Mar 08, 1990; Auburn, AL; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Moisture and heat budgets of a cirrus cloud from aircraft measurements during fire - October 31 case study (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Increasing knowledge of cirrus cloud properties can contribute to general circulation model development and ultimately to a better understanding of climate. The objective of this study is to gain better understanding of cirrus cloud characteristics. Observations from different sensors during the FIRE experiment which took place in Wisconsin over Oshkosh (Starr, 1987), together with pertinent calculations, will be used to understand the dynamic, microphysical, and radiative characteristics of these clouds.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: 1990 Conference on Cloud Physics; Jul 23, 1990 - Jul 27, 1990; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 7
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    Multiobjective decision making in a fuzzy environment with applications to helicopter design (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA Journal (ISSN 0001-1452); 28; 703-710
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    NASA TECHNICAL REPORTS
  • 8
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    Analytical and experimental study of the vibration of bonded beams with a lap joint (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A theoretical model to study the flexural vibration of a bonded lap joint system is described in this paper. First, equations of motion at the joint region are derived using a differential element approach. The transverse displacements of the upper and lower beam are considered to be different. The adhesive is assumed to be linearly viscoelastic and the widely used Kelvin-Voight model is used to represent the viscoelastic behavior of the adhesive. The shear force at the interface between the adhesive and the beam is obtained from the simple bending motion equations of the two beams. The resulting equations of motion are combined with the equations of transverse vibration of the beams in the unjointed regions. These are later solved as a boundary value problem to obtain the eigenvalues and eigenvectors of the system. The model can be used to predict the natural frequencies, modal damping ratios, and mode shapes of the system for free vibration. Good agreement between numerical and experimental results was obtained for a system of graphite epoxy beams lap-jointed by an epoxy adhesive.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME, Transactions, Journal of Vibration and Acoustics (ISSN 0739-3717); 112; 444-451
    Format: text
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    NASA TECHNICAL REPORTS
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