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  • Other Sources  (7)
  • Aeronautics (General)  (3)
  • Fluid Mechanics and Thermodynamics  (2)
  • Engineering (General)  (1)
  • Fluid Mechanics and Thermodynamics; Computer Programming and Software  (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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    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
  • 3
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    Airships 101: Rediscovering the Potential of Lighter-Than-Air (LTA) (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An overview of airships past, present, and future is provided in a Powerpoint-formatted presentation. This presentation was requested for transfer to the British MOD by Paul Espinosa of NASA Ames, Code PX. The presentation provides general information about airships divided into four main categories: the legacy of NASA Ames in LTA (Lighter-Than-Air), LTA taxonomy and theory, LTA revival and missions, and LTA research and technology.
    Keywords: Aeronautics (General)
    Type: ARC-E-DAA-TN4810
    Format: application/pdf
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  • 4
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    Manned Versus Unmanned Risk and Complexity Considerations for Future Midsized X-Planes (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objective of this work was to identify and estimate complexity and risks associated with the development and testing of new low-cost medium-scale X-plane aircraft primarily focused on air transport operations. Piloting modes that were evaluated for this task were manned, remotely piloted, and unmanned flight research programs. This analysis was conducted early in the data collection period for X-plane concept vehicles before preliminary designs were complete. Over 50 different aircraft and system topics were used to evaluate the three piloting control modes. Expert group evaluations from a diverse set of pilots, engineers, and other experts at Aeronautics Research Mission Directorate centers within the National Aeronautics and Space Administration provided qualitative reasoning on the many issues surrounding the decisions regarding piloting modes. The group evaluations were numerically rated to evaluate each topic quantitatively and were used to provide independent criteria for vehicle complexity and risk. An Edwards Air Force Base instruction document was identified that emerged as a source of the effects found in our qualitative and quantitative data. The study showed that a manned aircraft was the best choice to align with test activities for transport aircraft flight research from a low-complexity and low-risk perspective. The study concluded that a manned aircraft option would minimize the risk and complexity to improve flight-test efficiency and bound the cost of the flight-test portion of the program. Several key findings and discriminators between the three modes are discussed in detail.
    Keywords: Aeronautics (General)
    Type: AFRC-E-DAA-TN41196 , Aviation 2017; Jun 05, 2017 - Jun 09, 2017; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    MiniWall Tool for Analyzing CFD and Wind Tunnel Large Data Sets (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It is challenging to review and assimilate large data sets created by Computational Fluid Dynamics (CFD) simulations and wind tunnel tests. Over the past 10 years, NASA Ames Research Center has developed and refined a software tool dubbed the MiniWall to increase productivity in reviewing and understanding large CFD-generated data sets. Under the recent NASA ERA project, the application of the tool expanded to enable rapid comparison of experimental and computational data. The MiniWall software is browser based so that it runs on any computer or device that can display a web page. It can also be used remotely and securely by using web server software such as the Apache HTTP server. The MiniWall software has recently been rewritten and enhanced to make it even easier for analysts to review large data sets and extract knowledge and understanding from these data sets. This paper describes the MiniWall software and demonstrates how the different features are used to review and assimilate large data sets.
    Keywords: Fluid Mechanics and Thermodynamics; Computer Programming and Software
    Type: ARC-E-DAA-TN38505 , AIAA SciTech Forum 2017; Jan 09, 2017 - Jan 13, 2017; Grapevine, TX; United States
    Format: application/pdf
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  • 6
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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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    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    Manned Versus Unmanned Risk and Complexity Considerations for Future Midsized X-Planes (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The objective of this work was to identify and estimate complexity and risks associated with the development and testing of new low-cost medium-scale X-plane aircraft primarily focused on air transport operations. Piloting modes that were evaluated for this task were manned, remotely piloted, and unmanned flight research programs. This analysis was conducted early in the data collection period for X-plane concept vehicles before preliminary designs were complete. Over 50 different aircraft and system topics were used to evaluate the three piloting control modes. Expert group evaluations from a diverse set of pilots, engineers, and other experts at Aeronautics Research Mission Directorate centers within the National Aeronautics and Space Administration provided qualitative reasoning on the many issues surrounding the decisions regarding piloting modes. The group evaluations were numerically rated to evaluate each topic quantitatively and were used to provide independent criteria for vehicle complexity and risk. An Edwards Air Force Base instruction document was identified that emerged as a source of the effects found in our qualitative and quantitative data. The study showed that a manned aircraft was the best choice to align with test activities for transport aircraft flight research from a low-complexity and low-risk perspective. The study concluded that a manned aircraft option would minimize the risk and complexity to improve flight-test efficiency and bound the cost of the flight-test portion of the program. Several key findings and discriminators between the three modes are discussed in detail.
    Keywords: Aeronautics (General)
    Type: NASA/TM-2017-219541 , AFRC-E-DAA-TN44856
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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