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  • Mechanical Engineering  (119)
  • Computer Programming and Software  (94)
  • 2010-2014  (76)
  • 2000-2004  (137)
  • 1
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    Friction Stir Welding Development at National Aeronautics and Space Administration-Marshall Space Flight Center (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: This paper presents an over-view of friction stir welding (FSW) process development and applications at Marshall Space Flight Center (MSFC). FSW process development started as a laboratory curiosity but soon found support from many users. The FSW process advanced very quickly and has found many applications both within and outside the aerospace industry. It is currently being adapted for joining key elements of the Space Shuttle External Tank for improved producibility and reliability. FSW process modeling is done to better understand and improve the process. Special tools have been developed to weld variable thickness materials including very thin and very thick materials. FSW is now being applied to higher temperature materials such as copper and to advanced materials such as metal matrix composites. FSW technology is being successfully transferred from MSFC laboratory to shop floors of many commercial companies.
    Keywords: Mechanical Engineering
    Type: TMS Conference; Nov 01, 2001; Indianapolis, IN; United States
    Format: text
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  • 2
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    Jupiter Europa Orbiter Architecture Definition Process (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The proposed Jupiter Europa Orbiter mission, planned for launch in 2020, is using a new architectural process and framework tool to drive its model-based systems engineering effort. The process focuses on getting the architecture right before writing requirements and developing a point design. A new architecture framework tool provides for the structured entry and retrieval of architecture artifacts based on an emerging architecture meta-model. This paper describes the relationships among these artifacts and how they are used in the systems engineering effort. Some early lessons learned are discussed.
    Keywords: Computer Programming and Software
    Type: INCOSE Conference on Systems Engineering Research; Apr 14, 2011 - Apr 16, 2011; Redondo Beach, CA; United States
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  • 3
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    The Western Aeronautical Test Range. Chapter 10 Tools (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Western Aeronautical Test Range (WATR) staff at the NASA Dryden Flight Research Center is developing a translation software called Chapter 10 Tools in response to challenges posed by post-flight processing data files originating from various on-board digital recorders that follow the Range Commanders Council Inter-Range Instrumentation Group (IRIG) 106 Chapter 10 Digital Recording Standard but use differing interpretations of the Standard. The software will read the date files regardless of the vendor implementation of the source recorder, displaying data, identifying and correcting errors, and producing a data file that can be successfully processed post-flight
    Keywords: Computer Programming and Software
    Type: DFRC-E-DAA-TN3481 , DFRC-E-DAA-TN4303 , International Telemetering Conference; Oct 24, 2011 - Oct 27, 2011; Las Vegas, NV; United States
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  • 4
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    Friction Stir Welding Development at NASA-Marshall Space Flight Center (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents an overview of friction stir welding (FSW) process development and applications at Marshall Space Flight Center (MSFC). FSW process development started as a laboratory curiosity but soon found support from many users. The FSW process advanced very quickly and has found many applications both within and outside the aerospace industry. It is currently being adapted for joining key elements of the Space Shuttle External Tank for improved producibility and reliability. FSW process modeling is done to better understand and improve the process. Special tools have been developed to weld variable thickness materials including thin and thick materials. FSW is now being applied to higher temperature materials such as copper and to advanced materials such as metal matrix composites. FSW technology is being successfully transferred from MSFC laboratory to shop floors of many commercial companies.
    Keywords: Mechanical Engineering
    Type: TMS Special Publication on Friction Stir Welding; Jan 01, 2001; Warrendale, PA; United States
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  • 5
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    A Software Architecture for Intelligent Synthesis Environments (2001)
    In:  Other Sources
    Details
    Publication Date: 2011-08-31
    Description: The NASA's Intelligent Synthesis Environment (ISE) program is a grand attempt to develop a system to transform the way complex artifacts are engineered. This paper discusses a "middleware" architecture for enabling the development of ISE. Desirable elements of such an Intelligent Synthesis Architecture (ISA) include remote invocation; plug-and-play applications; scripting of applications; management of design artifacts, tools, and artifact and tool attributes; common system services; system management; and systematic enforcement of policies. This paper argues that the ISA extend conventional distributed object technology (DOT) such as CORBA and Product Data Managers with flexible repositories of product and tool annotations and "plug-and-play" mechanisms for inserting "ility" or orthogonal concerns into the system. I describe the Object Infrastructure Framework, an Aspect Oriented Programming (AOP) environment for developing distributed systems that provides utility insertion and enables consistent annotation maintenance. This technology can be used to enforce policies such as maintaining the annotations of artifacts, particularly the provenance and access control rules of artifacts-, performing automatic datatype transformations between representations; supplying alternative servers of the same service; reporting on the status of jobs and the system; conveying privileges throughout an application; supporting long-lived transactions; maintaining version consistency; and providing software redundancy and mobility.
    Keywords: Computer Programming and Software
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  • 6
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    Overview of NASA's UEET Program (2002)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper presents a general overview of NASA's Ultra Efficient Engine Technology (UEET) Program. The program's vision is to develop and hand off revolutionary turbine engine propulsion technologies that will enable future generation vehicles over a wide range of flight speeds. The specific goals include: 1) Perform propulsion technologies to enable increases in system efficiency and, therefore, fuel burn reductions of up to 15% (equivalent reductions in CO2); and 2) Provide combustor technologies (configuration and materials) which will enable reductions in Landing/Take-off (LTO) NOx of 70% relative to 1996 ICAO standards.
    Keywords: Mechanical Engineering
    Type: 2001 NASA Seal/Secondary Air System Workshop; Volume 1; 53-67; NASA/CP-2002-211911/VOL1
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  • 7
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    Overview of NASA Glenn Seal Development Program (2001)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: NASA Glenn hosted the Seals/Secondary Air System Workshop on October 25-26, 2000. Each year NASA and our industry and university partners share their respective seal technology developments. We use these workshops as a technical forum to exchange recent advancements and 'lessons-learned' in advancing seal technology and solving problems of common interest. As in the past we are publishing two volumes. Volume I will be publicly available and individual papers will be made available online through the web page address listed at the end of this chapter.
    Keywords: Mechanical Engineering
    Type: 2000 NASA Seal/Secondary Air System Workshop; Volume 1; 1-21; NASA/CP-2001-211208/VOL1
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  • 8
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    Managing Distributed Systems with Smart Subscriptions (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: We describe an event-based, publish-and-subscribe mechanism based on using 'smart subscriptions' to recognize weakly-structured events. We present a hierarchy of subscription languages (propositional, predicate, temporal and agent) and algorithms for efficiently recognizing event matches. This mechanism has been applied to the management of distributed applications.
    Keywords: Computer Programming and Software
    Type: Distributed Objects in Computational Science; Unknown
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  • 9
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    Aspect-Oriented Programming is Quantification and Obliviousness (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: This paper proposes that the distinguishing characteristic of Aspect-Oriented Programming (AOP) systems is that they allow programming by making quantified programmatic assertions over programs written by programmers oblivious to such assertions. Thus, AOP systems can be analyzed with respect to three critical dimensions: the kinds of quantifications allowed, the nature of the actions that can be asserted, and the mechanism for combining base-level actions with asserted actions. Consequences of this perspective are the recognition that certain systems are not AOP and that some mechanisms are expressive enough to allow programming an AOP system within them. A corollary is that while AOP can be applied to Object-Oriented Programming, it is an independent concept applicable to other programming styles.
    Keywords: Computer Programming and Software
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  • 10
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    Redirecting by Injector (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: We describe the Object Infrastructure Framework, a system that seeks to simplify the creation of distributed applications by injecting behavior on the communication paths between components. We touch on some of the ilities and services that can be achieved with injector technology, and then focus on the uses of redirecting injectors, injectors that take requests directed at a particular server and generate requests directed at others. We close by noting that OIF is an Aspect-Oriented Programming system, and comparing OIF to related work.
    Keywords: Computer Programming and Software
    Format: application/pdf
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