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  • 1
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    Systems Analysis Approach for the NASA Environmentally Responsible Aviation Project (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This conference paper describes the current systems analysis approach being implemented for the Environmentally Responsible Aviation Project within the Integrated Systems Research Program under the NASA Aeronautics Research Mission Directorate. The scope and purpose of these systems studies are introduced followed by a methodology overview. The approach involves both top-down and bottoms-up components to provide NASA s stakeholders with a rationale for the prioritization and tracking of a portfolio of technologies which enable the future fleet of aircraft to operate with a simultaneous reduction of aviation noise, emissions and fuel-burn impacts to our environment. Examples of key current results and relevant decision support conclusions are presented along with a forecast of the planned analyses to follow.
    Keywords: Aircraft Design, Testing and Performance
    Type: AIAA Paper 2011-3528 , NF1676L-12989 , 3rd AIAA Atmospheric Space Environments Conference; Jun 27, 2011 - Jun 30, 2011; Honolulu, HI; United States
    Format: application/pdf
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  • 2
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    Evaluation of Fatigue Crack Growth and Fracture Properties of Cryogenic Model Materials (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The criteria used to prevent failure of wind-tunnel models and support hardware were revised as part of a project to enhance the capabilities of cryogenic wind tunnel testing at NASA Langley Research Center. Specifically, damage-tolerance fatigue life prediction methods are now required for critical components, and material selection criteria are more general and based on laboratory test data. The suitability of two candidate model alloys (AerMet 100 and C-250 steel) was investigated by obtaining the fatigue crack growth and fracture data required for a damage-tolerance fatigue life analysis. Finally, an example is presented to illustrate the newly implemented damage tolerance analyses required of wind-tunnel model system components.
    Keywords: Metals and Metallic Materials
    Type: NASA/TM-2002-211673 , L-18179 , NAS 1.15:211673 , ARL-TR-2725
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A Sizing Methodology for the Conceptual Design of Blended-Wing-Body Transports (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: This paper describes the development of a methodology for sizing Blended-Wing-Body (BWB) transports and how the capabilities of the Flight Optimization System (FLOPS) have been expanded using that methodology. In this approach, BWB transports are sized based on the number of passengers in each class that must fit inside the centerbody or pressurized vessel. Weight estimation equations for this centerbody structure were developed using Finite Element Analysis (FEA). This paper shows how the sizing methodology has been incorporated into FLOPS to enable the design and analysis of BWB transports. Previous versions of FLOPS did not have the ability to accurately represent or analyze BWB configurations in any reliable, logical way. The expanded capabilities allow the design and analysis of a 200 to 450-passenger BWB transport or the analysis of a BWB transport for which the geometry is already known. The modifications to FLOPS resulted in differences of less than 4 percent for the ramp weight of a BWB transport in this range when compared to previous studies performed by NASA and Boeing.
    Keywords: Aircraft Design, Testing and Performance
    Type: NASA/CR-2004-213016
    Format: application/pdf
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  • 4
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    Research in Modeling and Simulation for Airspace Systems Innovation (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation provides an overview of some of the applied research and simulation methodologies at the NASA Langley Research Center that support aerospace systems innovation. Risk assessment methodologies, complex systems design and analysis methodologies, and aer ospace operations simulations are described. Potential areas for future research and collaboration using interactive and distributed simula tions are also proposed.
    Keywords: Systems Analysis and Operations Research
    Type: 6th Eurocontrol Innovative Research Workshops and Exhibition; Dec 04, 2007 - Dec 06, 2007; Bretigny; France
    Format: application/pdf
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  • 5
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    Future Air Traffic Growth and Schedule Model User's Guide (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The Future Air Traffic Growth and Schedule Model was developed as an implementation of the Fratar algorithm to project future traffic flow between airports in a system and of then scheduling the additional flights to reflect current passenger time-of-travel preferences. The methodology produces an unconstrained future schedule from a current (or baseline) schedule and the airport operations growth rates. As an example of the use of the model, future schedules are projected for 2010 and 2022 for all flights arriving at, departing from, or flying between all continental United States airports that had commercial scheduled service for May 17, 2002. Inter-continental US traffic and airports are included and the traffic is also grown with the Fratar methodology to account for their arrivals and departures to the continental US airports. Input data sets derived from the Official Airline Guide (OAG) data and FAA Terminal Area Forecast (TAF) are included in the examples of the computer code execution.
    Keywords: Computer Programming and Software
    Type: NASA/CR-2004-213027
    Format: application/pdf
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  • 6
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    Future Air Traffic Growth and Schedule Model, Supplement (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The Future Air Traffic Growth and Schedule Model was developed as an implementation of the Fratar algorithm to project future traffic flow between airports in a system and of then scheduling the additional flights to reflect current passenger time-of-travel preferences. The methodology produces an unconstrained future schedule from a current (or baseline) schedule and the airport operations growth rates. As an example of the use of the model, future schedules are projected for 2010 and 2022 for all flights arriving at, departing from, or flying between all continental United States airports that had commercial scheduled service for May 17, 2002. Inter-continental US traffic and airports are included and the traffic is also grown with the Fratar methodology to account for their arrivals and departures to the continental US airports. Input data sets derived from the Official Airline Guide (OAG) data and FAA Terminal Area Forecast (TAF) are included in the examples of the computer code execution.
    Keywords: Computer Programming and Software
    Type: NASA/CR-2004-213027/SUPPL
    Format: application/pdf
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  • 7
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    Analysis and Perspective from the Complex Aerospace Systems Exchange (CASE) 2013 (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Langley Research Center embedded four rapporteurs at the Complex Aerospace Systems Exchange (CASE) held in August 2013 with the objective to capture the essence of the conference presentations and discussions. CASE was established to provide a discussion forum among chief engineers, program managers, and systems engineers on challenges in the engineering of complex aerospace systems. The meeting consists of invited presentations and panels from industry, academia, and government followed by discussions among attendees. This report presents the major and reoccurring themes captured throughout the meeting and provides analysis and insights to further the CASE mission.
    Keywords: Aeronautics (General)
    Type: NF1676L-18120 , AIAA Science and Technology Forum and Exposition (SciTech2014); Jan 13, 2014 - Jan 17, 2014; National Harbor, MD; United States
    Format: application/pdf
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  • 8
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    A Program of Combined Research and Education to Advanced the Design, Synthesis, and Optimization of Aero-Space System Concepts (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This final report for a grant lists the personnel involved, and thesis/project titles for research funded by the grant.
    Keywords: Engineering (General)
    Format: text
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