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  • Other Sources  (219)
  • FLUID MECHANICS AND HEAT TRANSFER  (81)
  • STRUCTURAL MECHANICS  (72)
  • COMMUNICATIONS AND RADAR  (66)
  • Animals
  • Chemical Engineering
  • Humans
  • Life and Medical Sciences
  • SPACE SCIENCES
  • 1990-1994  (219)
  • 1980-1984
  • 1992  (219)
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  • 1990-1994  (219)
  • 1980-1984
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  • 1
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    Modeling of resistive sheets in finite element solutions (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A formulation is presented for modeling a resistive card in the context of the finite element method. The appropriate variational function is derived and for variational purposes results are presented for the scattering by metal-backed cavity loaded with a resistive card.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 40; 6, Ju; 727-731
    Format: text
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  • 2
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    Modeling of supersonic combustor flows using parallel computing (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: While current 3D CFD codes and modeling techniques have been shown capable of furnishing engineering data for complex scramjet flowfields, the usefulness of such efforts is primarily limited by solutions' CPU time requirements, and secondarily by memory requirements. Attention is presently given to the use of parallel computing capabilities for engineering CFD tools for the analysis of supersonic reacting flows, and to an illustrative incompressible CFD problem using up to 16 iPSC/2 processors with single-domain decomposition.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computing Systems in Engineering (ISSN 0956-0521); 3; 1-4; p. 217-229.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The effects of crushing surface roughness on the crushing characteristics of composite tubes (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The effects of crushing-surface roughness on the energy-absorption capability of graphite and glass-epoxy composite tubes were investigated. Fifty different combinations of fiber, matrix, and specimen ply orientation were evaluated. Two different crushing surface roughnesses were used in this investigation. Crushing surface significantly influences the energy-absorption capability only of tubes that crush in the lamina bending crushing mode; tubes that crush in other modes are not influenced because their lamina bundles do not slide against the crushing surface. Those tubes that crush in the lamina bending mode can achieve higher, lower, or no change in energy-absorption capability as crushing surface roughness increases. If the fiber failure strain of tubes that crush in the lamina bending crushing mode exceeds the matrix failure strain then the energy-absorption capability increases as crushing surface roughness increases. However, if the matrix failure strain exceeds the fiber failure strain then the energy-absorption capability increases as crushing surface roughness decreases. Energy-absorption capability is uninfluenced by crushing surface roughness for tubes that have equal fiber and matrix failure strains.
    Keywords: STRUCTURAL MECHANICS
    Type: American Helicopter Society, Journal (ISSN 0002-8711); 37; 3; p. 53-60.
    Format: text
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  • 4
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    Criteria for ultrastable operation of the trapped ion frequency standard (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The leading systematic perturbations to the Jet Propulsion Laboratory's (JPL's) mercury trapped ion frequency standard are characterized under present operating conditions. Sensitivity of the standard to environmental variations is measured, and the required regulation of key components to obtain a stability of 10(exp -16) is identified.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 19-30
    Format: application/pdf
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  • 5
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    Modeling of resistive sheets in finite element solutions (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A formulation is presented for modeling a resistive card in the context of the finite element method. The appropriate variational function is derived and for variational purposes results are presented for the scattering by a metal-backed cavity loaded with a resistive card.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Michigan Univ., Electromagnetic Characterization of Conformal Antennas; 11 p
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  • 6
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    Computational fluid dynamics analysis of Space Shuttle main engine multiple plume flows at high-altitude flight conditions (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Computational fluid dynamics (CFD) analysis is providing verification of Space Shuttle flight performance details and is being applied to Space Shuttle Main Engine Multiple plume interaction flow field definition. Advancements in real-gas CFD methodology that are described have allowed definition of exhaust plume flow details at Mach 3.5 and 107,000 ft. The specific objective includes the estimate of flow properties at oblique shocks between plumes and plume recirculation into the Space Shuttle Orbiter base so that base heating and base pressure can be modeled accurately. The approach utilizes the Rockwell USA Real Gas 3-D Navier-Stokes (USARG3D) Code for the analysis. The code has multi-zonal capability to detail the geometry of the plumes based region and utilizes finite-rate chemistry to compute the plume expansion angle and relevant flow properties at altitude correctly. Through an improved definition of the base recirculation flow properties, heating, and aerodynamic design environments of the Space Shuttle Vehicle can be further updated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Goddard Space Flight Center, Tenth Workshop for Computational Fluid Dynamic Applications in Rocket Propulsion, Part 2; p 923-943
    Format: text
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  • 7
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    A high-performance Hg(+) trapped ion frequency standard (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A high-performance frequency standard based on (199)Hg(+) ions confined in a hybrid radio frequency (RF)/dc linear ion trap is demonstrated. This trap permits storage of large numbers of ions with reduced susceptibility to the second-order Doppler effect caused by the RF confining fields. A 160-mHz-wide atomic resonance line for the 40.5-GHz clock transition is used to steer the output of a 5-mHz crystal oscillator to obtain a stability of 2 x 10(exp -15) for 24,000-second averaging times. Measurements with a 37-mHz line width for the Hg(+) clock transition demonstrate that the inherent stability for this frequency standard is better than 1 x 10(exp -15) at 10,000-second averaging times.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 10-18
    Format: application/pdf
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  • 8
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    Mini-mast CSI testbed user's guide (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Mini-Mast testbed is a 20 m generic truss highly representative of future deployable trusses for space applications. It is fully instrumented for system identification and active vibrations control experiments and is used as a ground testbed at NASA-Langley. The facility has actuators and feedback sensors linked via fiber optic cables to the Advanced Real Time Simulation (ARTS) system, where user defined control laws are incorporated into generic controls software. The object of the facility is to conduct comprehensive active vibration control experiments on a dynamically realistic large space structure. A primary goal is to understand the practical effects of simplifying theoretical assumptions. This User's Guide describes the hardware and its primary components, the dynamic characteristics of the test article, the control law implementation process, and the necessary safeguards employed to protect the test article. Suggestions for a strawman controls experiment are also included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102630 , NAS 1.15:102630
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  • 9
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    Electromagnetic characterization of conformal antennas (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The ultimate objective of this project is to develop a new technique which permits an accurate simulation of microstrip patch antennas or arrays with various feed, superstrate and/or substrate configurations residing in a recessed cavity whose aperture is planar, cylindrical or otherwise conformed to the substructure. The technique combines the finite element and boundary integral methods to formulate a system suitable for solution via the conjugate gradient method in conjunction with the fast Fourier transform. The final code is intended to compute both scattering and radiation patterns of the structure with an affordable memory demand. With upgraded capabilities, the four included papers examined the radar cross section (RCS), input impedance, gain, and resonant frequency of several rectangular configurations using different loading and substrate/superstrate configurations.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-189530 , NAS 1.26:189530 , UMICH-027723-4-T
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  • 10
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    Coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Accomplishments are described for the first year effort of a 5-year program to develop a methodology for coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures. These accomplishments include: (1) the results of the selective literature survey; (2) 8-, 16-, and 20-noded isoparametric plate and shell elements; (3) large deformation structural analysis; (4) eigenanalysis; (5) anisotropic heat transfer analysis; and (6) anisotropic electromagnetic analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-189150 , NAS 1.26:189150
    Format: application/pdf
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