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  • 1
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    A General-Coordinate Formulation For Boundary-Layer Flow (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Formulation for solution of equations of boundary-layer flow in general body-fitted curvilinear coordinates retains velocities in Cartesian coordinates. Increases stability of numerical simulations by avoiding coordinate source terms. In formulation, curvilinear coordinates do not have to be orthogonal, and much of software developed previously for use in numerical simulations of flow based on Navier-Stokes equations used.
    Keywords: MECHANICS
    Type: ARC-12465 , NASA Tech Briefs (ISSN 0145-319X); 15; 12; P. 59
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Damping Of Vibrations In Graphite/Epoxy Structures (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes study of vibration-damping properties, in air and vacuum, of graphite/epoxy composite structural members joined by adhesives. Determines vibration-damping effects of specimens representative of members and joints of truss, particularly after gases and moisture trapped during manufacture released in vacuum. Damping ratios measured under free and forced vibrations and before and after outgassing in vacuum. Effects of end-support conditions and high and low temperatures on damping also measured.
    Keywords: MECHANICS
    Type: MFS-27228 , NASA Tech Briefs (ISSN 0145-319X); 15; 7; P. 74
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Calculating Viscous/Inviscid Interactions (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Report describes some experiences in numerical simulation of compressible, viscous flows by finite-difference approximations of Navier-Stokes equations. Focuses upon viscous/inviscid-interaction approach, in which flow mathematically modeled with interacting zones, within each of which different model of viscous or inviscid flow applies. Reduces task of computation by taking advantage of simpler models and coarser grids in some of zones.
    Keywords: MECHANICS
    Type: ARC-12115 , NASA Tech Briefs (ISSN 0145-319X); 15; 4; P. 85
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Computing Flutter Boundaries (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: MISER2 computer program calculates flutter boundaries and aeroelastic response of cascade of arbitrarily mistuned airfoils. Based on typical section formulation incorporating incompressible, subsonic and supersonic cascade, unsteady aerodynamic theories. Each blade modeled as two-degree-of-freedom oscillator that has inertial coupling between bending and torsional motions. Written in FORTRAN 4.
    Keywords: MECHANICS
    Type: LEW-14380 , NASA Tech Briefs (ISSN 0145-319X); 13; 4; P. 87
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Stiffening Heat-Exchanger Tubes Against Vibrations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Midsection clamps reduce harmful effects of crossflow. Clamp bolts onto four tubes, increasing stiffness and natural frequency. Unstable vibrations suppressed.
    Keywords: MECHANICS
    Type: MFS-19907 , NASA Tech Briefs (ISSN 0145-319X); 11; 9; P. 84
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    NASA TECHNICAL REPORTS
  • 6
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    Vibration-Free Vanes Direct Cryogenic Flow (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Upstream fluid-dynamic surface prevents oscillations. Simple structural addition to liquid-oxygen manifold prevents vibration and allows increased flow. T-shaped manifold uses vanes to distribute liquid oxygen. Far from vanes, spoiler suppresses vibrations caused by unstable dynamic coupling between flow and elasticity of vanes.
    Keywords: MECHANICS
    Type: MFS-29180 , NASA Tech Briefs (ISSN 0145-319X); 11; 7; P. 73
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  • 7
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    Reducing Fatigue in a Rotary Flowmeter (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Redesign of vanes straightening flow of liquid in rotary flowmeter increase fatigue lives of vanes and rotor. Purpose of vanes to eliminate turbulence so proportionality between flow and rotor speed constant. Nonuniform but symmetrical, new spacing of straightener vanes prevents flow wake from strongly interacting with rotor blades. At same time, vanes ensure accurate flow-rate measurement.
    Keywords: MECHANICS
    Type: MFS-29038 , NASA Tech Briefs (ISSN 0145-319X); 11; 2; P. 64
    Format: text
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    NASA TECHNICAL REPORTS
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