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  • Other Sources  (362)
  • STRUCTURAL MECHANICS  (252)
  • COMMUNICATIONS
  • 1970-1974  (362)
  • 1965-1969
  • 1974  (362)
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  • Other Sources  (362)
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  • 1970-1974  (362)
  • 1965-1969
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  • 1
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    Graphic arts techniques and equipment: A compilation (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Technology utilization of NASA sponsored projects involving graphic arts techniques and equipment is discussed. The subjects considered are: (1) modification to graphics tools, (1) new graphics tools, (3) visual aids for graphics, and (4) graphic arts shop hints. Photographs and diagrams are included to support the written material.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5919(02)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Arbitrarily Curved and Twisted Space Beams (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A derivation of the equations which govern the deformation of an arbitrarily curved and twisted space beam is presented. These equations differ from those of the classical theory in that (1) extensional effects are included; (2) the strain-displacement relations are derived; and (3) the expressions for the stress resultants are developed from the strain displacement relations. It is shown that the torsional stress resultant obtained by the classical approach is basically incorrect except when the cross-section is circular. The governing equations are given in the form of first-order differential equations. A numerical algorithm is given for obtaining the natural vibration characteristics and example problems are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-72185
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Buckling analysis for anisotropic laminated plates under combined inplane loads (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The buckling analysis presented considers rectangular flat or curved general laminates subjected to combined inplane normal and shear loads. Linear theory is used in the analysis. All prebuckling deformations and any initial imperfections are ignored. The analysis method can be readily extended to longitudinally stiffened structures subjected to combined inplane normal and shear loads.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-038
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Application of variational and Galerkin equations to linear and nonlinear finite element analysis (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The paper discusses the application of the variational equation to nonlinear finite element analysis. The problem of beam vibration with large deflection is considered. The variational equation is shown to be flexible in both the solution of a general problem and in the finite element formulation. Difficulties are shown to arise when Galerkin's equations are used in the consideration of the finite element formulation of two-dimensional linear elasticity and of the linear classical beam.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-026
    Format: text
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  • 5
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    Stress intensity factors for deep cracks emanating from the corner formed by a hole intersecting a plate surface (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A technique consisting of a marriage between stress freezing photoelasticity and a numerical method was used to obtain stress intensity factors for natural cracks emanating from the corner at which a hole intersects a plate surface. Geometrics studied were: crack depth to thickness ratios of approximately 0.2, 0.5, and 0.75; crack depth to crack length ratios of approximately 1.0 to 2.0. All final crack geometries were grown under monotonic loading and growth was not self similar with most of the growth occurring through the thickness under remote extension. Stress intensity plate surface K sub s factors were determined at the intersection of the flaw border with the plate surface K sub s and with the edge of the hole K sub h. Results showed that for the relatively shallow flaws K sub h approximately equal to 1.5 K sub s, for the moderately deep flaws K sub h approximately equal to K sub s, and for the deep flaws K sub h approximately equal to 0.5 K sub s, revealing a severe sensitivity of K to flaw geometry.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-136930 , VPI-E-74-1
    Format: application/pdf
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  • 6
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    Phase-locked loops (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The basic analysis and design procedures are described for the realization of analog phase-locked loops (APLL), hybrid phase-locked loops (HPLL), discrete phase-locked loops, and digital phase-locked loops (DPLL). Basic configurations are diagrammed, and performance curves are given. A discrete communications model is derived and developed. The use of the APLL as an optimum angle demodulator and the Kalman-Bucy approach to APLL design are discussed. The literature in the area of phase-locked loops is reviewed, and an extensive bibliography is given. Although the design of APLLs is fairly well documented, work on discrete, hybrid, and digital PLLs is scattered, and more will have to be done in the future to pinpoint the formal design of DPLLs.
    Keywords: COMMUNICATIONS
    Type: Communication Systems and Technology Conference; Apr 30, 1974 - May 01, 1974; Dallas, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A procedure for verifying the structural integrity of an existing pressurized wind tunnel (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present work describes the approach employed in verifying the structural integrity at maximum operating pressure of a low turbulence pressurized wind tunnel built in 1939-1940. The approach utilized existing ASME Code guidelines and fracture mechanics techniques in combination with the latest nondestructive examination methods to validate the desired life of the facility while minimizing reconstruction or major modifications. Detailed stress analyses using a finite element computer program and a numerical integration program were performed on critical areas of the tunnel. Critical vessel areas were evaluated for remaining fatigue life. Fracture mechanics analyses of the shell were performed at various regions, and critical flaw sizes at each location were determined. Analysis of the test data permitted the remaining useful life of the tunnel to be estimated at 8 to 10 years.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 74-MAT-12 , Pressure Vessels and Piping Conference; Jun 24, 1974 - Jun 28, 1974; Miami Beach, FL
    Format: text
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  • 8
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    Investigation of pyrotechnic shock (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Review of comparative pyrotechnic shock outputs of various electro-explosive release devices that have been obtained in tests of an instrumented spacecraft structure. This research uses pyrotechnic shock spectra levels as an indicator of shock environment severity in support of a program of pyrotechnic device analysis and redesign intended to reduce shock generation.
    Keywords: STRUCTURAL MECHANICS
    Type: International Instrumentation Symposium; May 21, 1974 - May 23, 1974; Albuquerque, NM
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Theory for the effects of turbulence in a planetary atmosphere on radio occultation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rytov's method is used to formulate the correlation functions for log-amplitude and phase fluctuations for both spherical and plane wave propagation in a turbulent medium whose correlation function for refractive index fluctuations is described by the product of a function of the average coordinate and a function of the difference coordinate. The results are applied to the study of radio occultation effects due to the atmosphere of Venus in the case of a flyby space probe. It is assumed that turbulence of isotropic and smoothly varying characteristics occurs in the Venusian atmosphere.
    Keywords: COMMUNICATIONS
    Type: Symposium on Electromagnetic Wave Theory; Jul 09, 1974 - Jul 12, 1974; London
    Format: text
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  • 10
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    The ATS-F/Nimbus-F tracking and orbit determination experiment (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The experiment described was conducted to demonstrate a procedure for tracking a near-earth satellite via a geostationary satellite without the aid of multiple ground station tracking. Another objective of the experiment was connected with the utilization of the broad tracking coverage provided by the geostationary satellite to obtain an improved geopotential solution. Questions of overall experiment implementation are discussed along with details regarding ground equipment, the ATS-F transponder, and the Nimbus-F transponder. Aspects of measurement evaluation are also examined, taking into account basic measurements, measurement interpretation, and approaches for orbit computation.
    Keywords: COMMUNICATIONS
    Type: International Convention and Exposition; Mar 26, 1974 - Mar 29, 1974; New York, NY
    Format: text
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