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  • 1
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    Nasa's Experiences Enabling the Capture and Sharing of Technical Expertise Through Communities of Practice (2012)
    Elsevier
    Details
    Publication Date: 2012-12-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Spacecraft Hybrid (Mixed-Actuator) Attitude Control Experiences on NASA Science Missions (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There is a heightened interest within NASA for the design, development, and flight implementation of mixed-actuator hybrid attitude control systems for science spacecraft that have less than three functional reaction wheel actuators. This interest is driven by a number of recent reaction wheel failures on aging, but what could be still scientifically productive, NASA spacecraft if a successful hybrid attitude control mode can be implemented. Over the years, hybrid (mixed-actuator) control has been employed for contingency attitude control purposes on several NASA science mission spacecraft. This paper provides a historical perspective of NASA's previous engineering work on spacecraft mixed-actuator hybrid control approaches. An update of the current situation will also be provided emphasizing why NASA is now so interested in hybrid control. The results of the NASA Spacecraft Hybrid Attitude Control Workshop, held in April of 2013, will be highlighted. In particular, the lessons learned captured from that workshop will be shared in this paper. An update on the most recent experiences with hybrid control on the Kepler spacecraft will also be provided. This paper will close with some future considerations for hybrid spacecraft control.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NF1676L-18796 , GNC 2014: International ESA Conference on Guidance, Navigation, and Control Systems; Jun 02, 2014 - Jun 06, 2014; Porto; Portugal
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Building Communities of Engineers to Share Technical Expertise (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Developed by the core community to describe our vision of an approach to ensure a sufficiently technically advanced and affordable AR&D technology base is available to support future NASA missions. The goal of this strategy is to create an environment exploiting reusable technology elements for an AR&D system design and development process which is: a) Lower-Risk. b) More Versatile/Scalable. c) Reliable & Crew-Safe. d) More Affordable.
    Keywords: Systems Analysis and Operations Research
    Type: Project Management Challenge; Feb 22, 2012 - Feb 23, 2012; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Relative Navigation Light Detection and Ranging (LIDAR) Sensor Development Test Objective (DTO) Performance Verification (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The NASA Engineering and Safety Center (NESC) received a request from the NASA Associate Administrator (AA) for Human Exploration and Operations Mission Directorate (HEOMD), to quantitatively evaluate the individual performance of three light detection and ranging (LIDAR) rendezvous sensors flown as orbiter's development test objective on Space Transportation System (STS)-127, STS-133, STS-134, and STS-135. This document contains the outcome of the NESC assessment.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: NASA/TM-2013-217992 , NESC-RP-11-00753 , L-20263 , NF1676L-16624
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Fast Attitude Maneuvers for the Lunar Reconnaissance Orbiter (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: This paper describes a new operational capability for fast attitude maneuvering that is being developed for the Lunar Reconnaissance Orbiter (LRO). The LRO hosts seven scientific instruments. For some instruments, it is necessary to per-form large off-nadir slews to collect scientific data. The accessibility of off-nadir science targets has been limited by slew rates and/or occultation, thermal and power constraints along the standard slew path. The new fast maneuver (FastMan) algorithm employs a slew path that autonomously avoids constraint violations while simultaneously minimizing the slew time. The FastMan algo-rithm will open regions of observation that were not previously feasible and improve the overall science return for LRO's extended mission. The design of an example fast maneuver for LRO's Lunar Orbiter Laser Altimeter that reduc-es the slew time by nearly 40% is presented. Pre-flight, ground-test, end-to-end tests are also presented to demonstrate the readiness of FastMan. This pioneer-ing work is extensible and has potential to improve the science data collection return of other NASA spacecraft, especially those observatories in extended mission phases where new applications are proposed to expand their utility.
    Keywords: Spacecraft Design, Testing and Performance
    Type: AAS 19-053 , GSFC-E-DAA-TN65209 , Annual AAS Guidance, Navigation, and Control Conference; Feb 01, 2019 - Feb 06, 2019; Breckenridge, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Observations on the State of NASA's GN&C Engineering Discipline: Results of an Independent Non-Advocate Study (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The NASA Technical Fellows periodically conduct State-of-the-Discipline assessments. The GN&C Technical Fellow contracted Harlan Brown & Company in 2007 and 2009 to conduct independent, third party studies to gain unbiased insight and understanding into the attitudes and beliefs of NASA's GN&C Community of Practice (CoP). The paper first outlines the background, objectives and methodology of the studies. The paper then summarizes key study results of the 2007 baseline study, as well as the 2009 update. The update was then used to track and monitor perceptions, identify performance trends, identify areas where further improvement needs to be made in NASA's GN&C discipline. It also generated feedback on the recently developed GN&C CoP online knowledge capture and learning site.
    Keywords: Spacecraft Design, Testing and Performance
    Type: LEGNEW-OLDGSFC-GSFC-LN-1085 , American Institute of Aeronautics and Astronautics (AIAA) Guidance, Navigation and Control Conference; Aug 02, 2010 - Aug 05, 2010; Toronto, Ontario; Canada
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The Value of Identifying and Recovering Lost GN&C Lessons Learned: Aeronautical, Spacecraft, and Launch Vehicle Examples (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Within the broad aerospace community the importance of identifying, documenting and widely sharing lessons learned during system development, flight test, operational or research programs/projects is broadly acknowledged. Documenting and sharing lessons learned helps managers and engineers to minimize project risk and improve performance of their systems. Often significant lessons learned on a project fail to get captured even though they are well known 'tribal knowledge' amongst the project team members. The physical act of actually writing down and documenting these lessons learned for the next generation of NASA GN&C engineers fails to happen on some projects for various reasons. In this paper we will first review the importance of capturing lessons learned and then will discuss reasons why some lessons are not documented. A simple proven approach called 'Pause and Learn' will be highlighted as a proven low-impact method of organizational learning that could foster the timely capture of critical lessons learned. Lastly some examples of 'lost' GN&C lessons learned from the aeronautics, spacecraft and launch vehicle domains are briefly highlighted. In the context of this paper 'lost' refers to lessons that have not achieved broad visibility within the NASA-wide GN&C CoP because they are either undocumented, masked or poorly documented in the NASA Lessons Learned Information System (LLIS).
    Keywords: Documentation and Information Science; Spacecraft Design, Testing and Performance
    Type: LEGNEW-OLDGSFC-GSFC-LN-1136 , AIAA Guidance, Navigation, and Control Conference; Aug 02, 2010 - Aug 05, 2010; Toronto, Ontario; Canada
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    The NASA Engineering and Safety Center (NESC) GN and C Technical Discipline Team (TDT): Its Purpose, Practices and Experiences (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This paper will briefly define the vision, mission, and purpose of the NESC organization. The role of the GN&C TDT will then be described in detail along with an overview of how this team operates and engages in its objective engineering and safety assessments of critical NASA projects. This paper will then describe key issues and findings from several of the recent GN&C-related independent assessments and consultations performed and/or supported by the NESC GN&C TDT. Among the examples of the GN&C TDT s work that will be addressed in this paper are the following: the Space Shuttle Orbiter Repair Maneuver (ORM) assessment, the ISS CMG failure root cause assessment, the Demonstration of Autonomous Rendezvous Technologies (DART) spacecraft mishap consultation, the Phoenix Mars lander thruster-based controllability consultation, the NASA in-house Crew Exploration Vehicle (CEV) Smart Buyer assessment and the assessment of key engineering considerations for the Design, Development, Test & Evaluation (DDT&E) of robust and reliable GN&C systems for human-rated spacecraft.
    Keywords: Engineering (General)
    Type: NASA/TM-2008-215128 , L-19471
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    The Development of NASA's Fault Management Handbook (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASA is developing a FM Handbook to establish guidelines and to provide recommendations for defining, developing, analyzing, evaluating, testing, and operating FM systems. It establishes a process for developing FM throughout the lifecycle of a mission and provides a basis for moving the field toward a formal and consistent FM methodology to be applied on future programs. This paper describes the motivation for, the development of, and the future plans for the NASA FM Handbook.
    Keywords: Systems Analysis and Operations Research
    Type: SafeProcess 2012; Aug 29, 2011; Mexico City; Mexico
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    GN&C Engineering Best Practices For Human-Rated Spacecraft Systems (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The NASA Engineering and Safety Center (NESC) recently completed an in-depth assessment to identify a comprehensive set of engineering considerations for the Design, Development, Test and Evaluation (DDT&E) of safe and reliable human-rated spacecraft systems. Reliability subject matter experts, discipline experts, and systems engineering experts were brought together to synthesize the current "best practices" both at the spacecraft system and subsystems levels. The objective of this paper is to summarize, for the larger Community of Practice, the initial set of Guidance, Navigation and Control (GN&C) engineering Best Practices as identified by this NESC assessment process.
    Keywords: Spacecraft Design, Testing and Performance
    Type: AIAA Guidance, Navigation, and Control Conference and Exhibit; Aug 20, 2007 - Aug 23, 2007; Hilton Head, SC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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