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There are a total of 515904 record(s) matching your query.
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Applications of FEM and BEM in two-dimensional fracture mechanics problems
Author(s): Min, J. B.; Steeve, B. E.; Swanson, G. R.
Abstract: A comparison of the finite element method (FEM) and boundary element method (BEM) for the solution of two-dimensional plane strain problems in fracture mechanics is presented in this paper. Stress intensity factors (SIF's) ...
NASA Center: Marshall Space Flight Center
Publication Year: 1992
Added to NTRS: 2008-09-08
Accession Number: 92N31280; Document ID: 19920022036; Report Number: M-695, NAS 1.60:3277, NASA-TP-3277
Output-Adaptive Tetrahedral Cut-Cell Validation for Sonic Boom Prediction
Author(s): Park, Michael A.; Darmofal, David L.
Abstract: A cut-cell approach to Computational Fluid Dynamics (CFD) that utilizes the median dual of a tetrahedral background grid is described. The discrete adjoint is also calculated, which permits adaptation based on improving the ...
NASA Center: Langley Research Center
Publication Year: 2008
Added to NTRS: 2008-09-08
Document ID: 20080033684
Piloted Evaluation of the H-Mode, a Variable Autonomy Control System, in Motion-Based Simulation
Author(s): Goodrich, Kenneth H.; Schutte, Paul C.; Williams, Ralph A.
Abstract: As aircraft become able to autonomously respond to a range of situations with performance surpassing human operators, we are compelled to look for new methods that help understand their use and guide the design of new, more ...
NASA Center: Langley Research Center
Publication Year: 2008
Added to NTRS: 2008-09-08
Document ID: 20080033695
Active Flow Control at Low Reynolds Numbers on a NACA 0015 Airfoil
Author(s): Melton, LaTunia Pack; Hannon, Judith; Yao, Chung-Sheng; Harris, Jerome
Abstract: Results from a low Reynolds number wind tunnel experiment on a NACA 0015 airfoil with a 30% chord trailing edge flap tested at deflection angles of 0, 20, and 40 are presented and discussed. Zero net mass flux periodic ...
NASA Center: Langley Research Center
Publication Year: 2008
Added to NTRS: 2008-09-08
Document ID: 20080033674
Sputtered silicon nitride coatings for wear protection
Author(s): Grill, A.; Aron, P. R.
Abstract: Silicon nitride films were deposited by RF sputtering on 304 stainless steel substrates in a planar RF sputtering apparatus. The sputtering was performed from a Si3N4 target in a sputtering atmosphere of argon and nitrogen. ...
NASA Center: Glenn Research Center
Publication Year: 1982
Added to NTRS: 2008-09-08
Accession Number: 82N20314; Document ID: 19820012440; Report Number: E-1143, NAS 1.15:82819, NASA-TM-82819
NASA Spinoffs - 30 Year Commemorative Edition
Author(s): Gall, Sarah L.; Pramberger, Joseph T.
Abstract: A pictorial overview of major NASA R&D mission programs during 1958-1992 is presented. NASA's achievements in the areas of health and medicine, public safety, energy, environment, resources management, computer ...
NASA Center: NASA (non Center Specific)
Publication Year: 1992
Added to NTRS: 2008-09-08
Accession Number: 96N71251; Document ID: 19960020963; Report Number: NAS 1.15:111432, NASA-TM-111432
NAS technical summaries: Numerical Aerodynamic Simulation Program, March 1990 - February 1991
Abstract: This report contains select scientific results from the Numerical Aerodynamic Simulation (NAS) Program's fourth year of operation, designated as the 1990-91 Operational Year. NASA created the NAS Program to focus resources ...
NASA Center: Ames Research Center
Publication Year: 1991
Added to NTRS: 2008-09-08
Accession Number: 94N71028; Document ID: 19940004273; Report Number: NAS 1.15:109379, NASA-TM-109379
A Flight Control System Architecture for the NASA AirSTAR Flight Test Infrastructure
Author(s): Murch, Austin M.
Abstract: A flight control system architecture for the NASA AirSTAR infrastructure has been designed to address the challenges associated with safe and efficient flight testing of research control laws in adverse flight conditions. ...
NASA Center: Langley Research Center
Publication Year: 2008
Added to NTRS: 2008-09-08
Document ID: 20080033683
Types and Characteristics of Data for Geomagnetic Field Modeling
Abstract: Given here is material submitted at a symposium convened on Friday, August 23, 1991, at the General Assembly of the International Union of Geodesy and Geophysics (IUGG) held in Vienna, Austria. Models of the geomagnetic ...
NASA Center: Goddard Space Flight Center
Publication Year: 1992
Added to NTRS: 2008-09-08
Accession Number: 92N28620; Document ID: 19920019377; Report Number: NAS 1.55:3153, NASA-CP-3153, REPT-92B00061
The NASA Langley 16-foot Transonic Tunnel: Historical overview, facility description, calibration, flow characteristics, and test capabilities
Author(s): Capone, Francis J.; Bangert, Linda S.; Asbury, Scott C.; Mills, Charles T. L.; Bare, E. Ann
Abstract: The Langley 16-Foot Transonic Tunnel is a closed-circuit single-return atmospheric wind tunnel that has a slotted octagonal test section with continuous air exchange. The wind tunnel speed can be varied continuously over a ...
NASA Center: Langley Research Center
Publication Year: 1995
Added to NTRS: 2008-09-08
Accession Number: 96N19288; Document ID: 19960014627; Report Number: L-17445, NAS 1.60:3521, NASA-TP-3521
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