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  • Fluid Mechanics and Thermodynamics  (2)
  • Man/System Technology and Life Support  (2)
  • Aircraft Design, Testing and Performance; Aircraft Stability and Control  (1)
  • Engineering (General)  (1)
  • 1
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    Aerospace Engineering Systems and the Advanced Design Technologies Testbed Experience (1999)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Continuous improvement of aerospace product development processes is a driving requirement across much of the aerospace community. As up to 90% of the cost of an aerospace product is committed during the first 10% of the development cycle, there is a strong emphasis on capturing, creating, and communicating better information (both requirements and performance) early in the product development process. The community has responded by pursuing the development of computer-based systems designed to enhance the decision-making capabilities of product development individuals and teams. Recently, the historical foci on sharing the geometrical representation and on configuration management are being augmented: 1) Physics-based analysis tools for filling the design space database; 2) Distributed computational resources to reduce response time and cost; 3) Web-based technologies to relieve machine-dependence; and 4) Artificial intelligence technologies to accelerate processes and reduce process variability. The Advanced Design Technologies Testbed (ADTT) activity at NASA Ames Research Center was initiated to study the strengths and weaknesses of the technologies supporting each of these trends, as well as the overall impact of the combination of these trends on a product development event. Lessons learned and recommendations for future activities are reported.
    Keywords: Engineering (General)
    Type: HPCCP/CAS Workshop Proceedings 1998; 197-204; NASA/CP-1999-208757
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Developments at the Advanced Design Technologies Testbed (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A report presents background and historical information, as of August 1998, on the Advanced Design Technologies Testbed (ADTT) at Ames Research Center. The ADTT is characterized as an activity initiated to facilitate improvements in aerospace design processes; provide a proving ground for product-development methods and computational software and hardware; develop bridging methods, software, and hardware that can facilitate integrated solutions to design problems; and disseminate lessons learned to the aerospace and information technology communities.
    Keywords: Man/System Technology and Life Support
    Type: ARC-14303-1 , NASA Tech Briefs, December 2003; 33
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Aerospace Engineering Systems (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Continuous improvement of aerospace product development processes is a driving requirement across much of the aerospace community. As up to 90% of the cost of an aerospace product is committed during the first 10% of the development cycle, there is a strong emphasis on capturing, creating, and communicating better information (both requirements and performance) early in the product development process. The community has responded by pursuing the development of computer-based systems designed to enhance the decision-making capabilities of product development individuals and teams. Recently, the historical foci on sharing the geometrical representation and on configuration management are being augmented: Physics-based analysis tools for filling the design space database; Distributed computational resources to reduce response time and cost; Web-based technologies to relieve machine-dependence; and Artificial intelligence technologies to accelerate processes and reduce process variability. Activities such as the Advanced Design Technologies Testbed (ADTT) project at NASA Ames Research Center study the strengths and weaknesses of the technologies supporting each of these trends, as well as the overall impact of the combination of these trends on a product development event. Lessons learned and recommendations for future activities will be reported.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: 8th International Symposium on Computational Fluid Dynamics; Sep 05, 1999 - Sep 10, 1999; Bremen; Germany|8th International Symposium on Computational Fluid Dynamics; Aug 30, 1999; Stockholm; Sweden|8th International Symposium on Computational Fluid Dynamics; Sep 03, 1999; Aachen; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Variable Geometry Aircraft Wing Supported by Struts And/Or Trusses (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The present invention provides an aircraft having variable airframe geometry for accommodating efficient flight. The aircraft includes an elongated fuselage, an oblique wing pivotally connected with said fuselage, a wing pivoting mechanism connected with said oblique wing and said fuselage, and a brace operably connected between said oblique wing and said fuselage. The present invention also provides an aircraft having an elongated fuselage, an oblique wing pivotally connected with said fuselage, a wing pivoting mechanism connected with said oblique wing and said fuselage, a propulsion system pivotally connected with said oblique wing, and a brace operably connected between said propulsion system and said fuselage.
    Keywords: Aircraft Design, Testing and Performance; Aircraft Stability and Control
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Development and Applications of 3D Cartesian CFD Technology (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The urgent need for dramatic reductions in aircraft design cycle time is focusing scrutiny upon all aspects of computational fluid dynamics (CFD). These reductions will most likely come not from increased reliance upon user-interactive (and therefore time-expensive) methods, but instead from methods that can be fully automated and incorporated into 'black box' solutions. In comparison with tetrahedral methods, three-dimensional Cartesian grid approaches are in relative infancy, but initial experiences with automated Cartesian techniques are quite promising. Our research is targeted at furthering the development of Cartesian methods so that they can become key elements of a completely automatic grid generation/flow solution procedure applicable to the Euler analysis of complex aircraft geometries.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA Lewis Surface Modeling and Grid Generation Workshop; May 09, 1995 - May 11, 1995; Cleveland, OH; United States
    Format: application/pdf
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  • 6
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    Software for Automated Generation of Cartesian Meshes (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Cart3D is a collection of computer programs for generating Cartesian meshes [for computational fluid dynamics (CFD) and other applications] in volumes bounded by solid objects. Aspects of Cart3D at earlier stages of development were reported in "Robust and Efficient Generation of Cartesian Meshes for CFD" (ARC-14275), NASA Tech Briefs, Vol. 23, No. 8 (August 1999), page 30. The geometric input to Cart3D comprises surface triangulations like those commonly generated by computer-aided-design programs. Complexly shaped objects can be represented as assemblies of simpler ones. Cart3D deletes all portions of such an assembled object that are not on the exterior surface. Intersections between components are preserved in the resulting triangulation. A tie-breaking routine unambiguously resolves geometric degeneracies. Then taking the intersected surface triangulation as input, the volume mesh is generated through division of cells of an initially coarse hexahedral grid. Cells are subdivided to refine the grid in regions of increased surface curvature and/or increased flow gradients. Cells that become split into multiple unconnected regions by thin pieces of surface are identified.
    Keywords: Man/System Technology and Life Support
    Type: ARC-14275-1 , NASA Tech Briefs, January 2006; 11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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