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SpaceOps 2008 Conference

作者： Smith, Dan Grubb, Thomas Esper, Jaime Software Engineering Division National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt MD 20771 United States Systems Engineering and Advanced Concepts Branch National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt MD 20771 United States

ISBN: (纸本)9781624101670

NASA's Goddard Mission Services Evolution Center (GMSEC) ground system architecture has been in development since late 2001 has successfully supported eight orbiting satellites and is being applied to several of NASA's future missions. GMSEC can be considered an event-driven, service-oriented architecture built around a publish/subscribe message bus middleware. This paper briefly discusses the GMSEC technical approaches which have led to significant cost savings and risk reduction for NASA missions operated at the Goddard Space flight Center (GSFC). The paper then focuses on the development and operational impacts of extending the architecture across multiple mission operations facilities.

关键词： NASA

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Development of an 11 kW Lightweight, High Efficiency Motor Controller for NASA X-57 Distributed Electric Propulsion Using SiC MOSFET Switches

Development of an 11 kW Lightweight, High Efficiency Motor C...

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AIAA/IEEE Electric Aircraft Technologies Symposium (EATS)

作者： Michael Garrett David Avanesian Matthew Granger Susanah Kowalewski John Maroli Wesley Miller Ralph Jansen Peter Kascak Diagnostics and Electromagnetics Branch/ Power Division Power Management and Distribution Branch/ Power Division Flight Software Branch/ Systems Engineering and Architecture Division Avionics Branch NASA Glenn Research Center Cleveland Ohio USA

A light weight, high efficiency, 11 kW motor controller, which includes the controlling processor and a three phase power inverter, has been developed at NASA Glenn Research Center for NASA's experimental all-electric manned aircraft, X-57, DEP high lift system. The high efficiency development was enabled through the use of a processor which implements Matlab/Simulink code for rapid performance optimization for specific motors and by the use of wide bandgap low-loss, low parasitic SiC switches in the power inverter. Due to the high efficiency, the controller is integrated into the high lift nacelle with no disturbance to the outer mold line of the nacelle; no drag-producing heatsinks are required. The controller weighs 1 kg and has demonstrated efficiency exceeding 97%.

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Toward Intelligent software Defect Detection - Learning software Defects by Example

Toward Intelligent Software Defect Detection - Learning Soft...

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Annual IEEE/ NASA Goddard Workshop on software engineering

作者： Markland J. Benson Ground Software Systems Branch Software Engineering Division NASA Goddard Space Flight Center Greenbelt MD USA

Source code level software defect detection has gone from state of the art to a software engineering best practice. Automated code analysis tools streamline many of the aspects of formal code inspections but have the drawback of being difficult to construct and either prone to false positives or severely limited in the set of defects that can be detected. Machine learning technology provides the promise of learning software defects by example, easing construction of detectors and broadening the range of defects that can be found. Pinpointing software defects with the same level of granularity as prominent source code analysis tools distinguishes this research from past efforts, which focused on analyzing software engineering metrics data with granularity limited to that of a particular function rather than a line of code.

关键词： software Presses Measurement Feature extraction software engineering Machine learning Training

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engineering complex embedded systems with state analysis and the mission data system

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Journal of Aerospace Computing, Information and Communication 2005年第12期2卷 507-536页

作者： Ingham, Michel D. Rasmussen, Robert D. Bennett, Matthew B. Moncada, Alex C. Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Dr. Pasadena CA 91109 United States Flight Software Systems Engineering and Architecture Group M/S 301-225 AIAA Systems and Software Division M/S 301-225 Flight Software Systems Engineering and Architecture Group M/S 156-142

It has become clear that spacecraft system complexity is reaching a threshold where customary methods of control are no longer affordable or sufficiently reliable. At the heart of this problem are the conventional approaches to systems and software engineering based on subsystem-level functional decomposition, which fail to scale in the tangled web of interactions typically encountered in complex spacecraft designs. Furthermore, there is a fundamental gap between the requirements on software specified by systems engineers and the implementation of these requirements by software engineers. software engineers must perform the translation of requirements into software code, hoping to accurately capture the systems engineer's understanding of the system behavior, which is not always explicitly specified. This gap opens up the possibility for misinterpretation of the systems engineer's intent, potentially leading to software errors. This problem is addressed by a systems engineering methodology called State Analysis, which provides a process for capturing system and software requirements in the form of explicit models. This paper describes how requirements for complex aerospace systems can be developed using State Analysis and how these requirements inform the design of the system software, using representative spacecraft examples. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Embedded systems

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An overview of the distributed space exploration simulation (DSES) project

An overview of the distributed space exploration simulation ...

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Spring Simulation Interoperability Workshop 2007, 07 Spring SIW

作者： Crues, Edwin Z. Chung, Victoria I. Blum, Michael G. Bowman, James D. Automation Robotics and Simulation Division Simulation and Graphics Branch NASA Johnson Space Center 2101 NASA Parkway Houston TX 77058 United States Flight Simulation and Software Branch Flight Research Services NASA Langley Research Center 24 West Taylor Street Hampton VA 23681 United States Aviation Systems Division NASA Ames Research Center Aerospace Simulation Operations Branch Moffett Field CA 94035 United States Missile Systems Group Teledyne Brown Engineering 300 Sparkman Drive Huntsville AL 35805 United States United States

ISBN: (纸本)9781604239232

This paper describes the Distributed Space Exploration Simulation (DSES) Project, a research and development collaboration between NASA centers which investigates technologies, and processes related to integrated, distributed simulation of complex space systems in support of NASA's Exploration Initiative. In particular, it describes the three major components of DSES: network infrastructure, software infrastructure and simulation development. With regard to network infrastructure, DSES is developing a Distributed Simulation Network for use by all NASA centers. With regard to software, DSES is developing software models, tools and procedures that streamline distributed simulation development and provide an interoperable infrastructure for agency-wide integrated simulation. Finally, with regard to simulation development, DSES is developing an integrated end-to-end simulation capability to support NASA development of new exploration spacecraft and missions. This paper presents the current status and plans for these three areas, including examples of specific simulations.

关键词： NASA

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Towards a standardization for simulation scenario development in aviation - Panel discussion

Towards a standardization for simulation scenario developmen...

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AIAA Modeling and Simulation Technologies Conference, 2018

作者： Durak, Umut Jafer, Shafagh Beard, Steven D. Reardon, Scott Murphy, James R. Crider, Dennis A. Gerretsen, Arno Lenz, Helge Macchiarella, Nickolas D. Rigby, Kevin T. Torens, Christoph Adolf, Florian-Michael Institute of Flight Systems Braunschweig38108 Germany Embry-Riddle Aeronautical University Daytona BeachFL32114-3900 United States NASA Ames Research Center Moffett Field CA94035 United States National Transportation Safety Board Washington DC20594 United States Amsterdam Netherlands Flight Dynamics and Simulation Department of Electrical Computer Software and Systems Engineering Aerospace Simulation Research and Development Branch Aviation Systems Division Vehicle Simulation Aerospace Operations Operator Performance Training and Simulation Aeronautical Sciences

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

Aviation industry is characterized by its broad utilization of modeling and simulation starting from concept demonstration to operator training. Scenario development is an important aspect of any simulation study, however, the community is still lacking of a common understanding and standardized practices. This leads to degraded interoperability and shareability. The American Institute of Aeronautics and Astronautics (AIAA) Modeling and Simulation Technical Committee (MSTC) is recently trying to create a synergy towards development of a standard scenario definition language for aviation by conducting sessions and panel discussions in conferences and launching a working group. This paper presents the recap of the panel discussion that has been carried out as a part of the invited session "Aviation Simulation Scenario Development" in AIAA Modeling and Simulation Technologies Conference of Scitech 2017. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Aviation

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systems of systems verification

Systems of systems verification

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InfoTech at Aerospace: Advancing Contemporary Aerospace Technologies and Their Integration

作者： Rouff, Christopher A. Hinchey, Michael Rash, James Truszkowski, Walt SAIC McLean VA 22102 NASA Goddard Space Flight Center Greenbelt MD 20771 Intelligent Systems Division MS 231 1710 SAIC Drive McLean VA 22102 AIAA NASA Software Engineering Laboratory NASA GSFC Code 581 Greenbelt MD 20771 Advanced Architectures and Automation Branch NASA Code 588 Greenbelt MD 20771

ISBN: (纸本)1563477394

To perform new science and exploration, NASA is proposing missions using multi-spacecraft where each spacecraft can act independently to perform a part of a mission but cannot complete it by itself. These missions are utilizing the concept of "System of systems" that are being used to develop large systems made up of interacting components, each of which is a system in its own right. To develop these systems with a high level of assurance, new verification methods will be needed to address the added complexity resulting from the nondeterminate nature of these systems as well as emergent behavior. To support the level of assurance that NASA missions require, formal specification techniques and formal verification will play vital roles in the future development of NASA space exploration missions. The role of formal methods will be in the specification and analysis of forthcoming missions, enabling software assurance and proof of correctness of the system of systems behavior, whether or not this behavior is emergent. Formal models derived may also be used as the basis for automating the generation of much of the code for the mission to further reduce the cost and probability of adding new errors during coding. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Spacecraft

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Advances in POST2 End-to-End Descent and Landing Simulation for the ALHAT Project

Advances in POST2 End-to-End Descent and Landing Simulation ...

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作者： Davis, Jody L. Striepe, Scott A. Maddock, Robert W. Hines, Glenn D. Paschall II, Stephen Cohanim, Babak E. Fill, Thomas Johnson, Michael C. Bishop, Robert H. DeMars, Kyle J. Sostaric, Ronald R. Johnson, Andrew E. NASA Langley Research Center Hampton VA 23681 United States Charles Stark Draper Laboratory Cambridge MA 02139 United States University of Texas at Austin Austin TX 78712 United States NASA Johnson Space Center Houston TX 77058 United States Jet Propulsion Laboratory Pasadena CA 91109 United States Atmospheric Flight and Entry Systems Branch MS 489 United States Flight Software Systems Branch MS 472 United States GNC Systems-Mission Design United States Space Systems MS 27 555 Technology Square United States GN and C Systems Division MS 70 United States Aerospace G and C 555 Technology Square MS 70 United States Aerospace Engineering and Engineering Mechanics WRW215FA United States Aerospace Engineering and Engineering Mechanics WRW411C United States Flight Mechanics and Trajectory Design Branch Mailcode EG5 United States Optical Navigation Group-GN and C Section MS 301-121 United States

ISBN: (纸本)9781563479458

Program to Optimize Simulated Trajectories II (POST2) is used as a basis for an end-to- end descent and landing trajectory simulation that is essential in determining design and integration capability and system performance of the lunar descent and landing system and environment models for the Autonomous Landing and Hazard Avoidance Technology (ALHAT) project. The POST2 simulation provides a six degree-of-freedom capability necessary to test, design and operate a descent and landing system for successful lunar landing. This paper presents advances in the development and model-implementation of the POST2 simulation, as well as preliminary system performance analysis, used for the testing and evaluation of ALHAT project system models.

关键词： Degrees of freedom (mechanics)

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A NASA approach to safety considerations for electric propulsion aircraft testbeds 53rd

A NASA approach to safety considerations for electric propul...

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53rd AIAA/SAE/ASEE Joint Propulsion Conference, 2017

作者： Papathakis, Kurt V. Sessions, Alaric M. Burkhardt, Phillip A. Ehmann, David W. NASA Armstrong Flight Research Center EdwardsCA93523 United States Jacobs Technology EdwardsCA93523 United States HEIST Power Architecture Vehicle Integration and Test Branch P.O. Box 273/MS4800D United States HEIST Hardware/Software Interface Simulations Engineering Branch P.O. Box 273/MS4840D United States HEIST Safety Engineer Safety of Flight Branch P.O. Box 273/MS4800 United States HEIST Power Systems Vehicle Integration and Test Branch P.O. Box 273/MS4800 United States

ISBN: (纸本)9781624105111

Electric, hybrid-electric, and turbo-electric distributed propulsion technologies and concepts are beginning to gain traction in the aircraft design community, as they can provide improvements in operating costs, noise, fuel consumption, and emissions compared to conventional internal combustion or Brayton-cycle powered vehicles. The National Aeronautics and Space Administration (NASA) is building multiple demonstrators and testbeds to buy down airworthiness and flight safety risks for these new technologies, including X-57 Maxwell, Hybrid-Electric Integrated systems Testbed (HEIST), Airvolt, and NASA Electric Aircraft Testbed (NEAT). This paper addresses the safety system design process used at NASA Armstrong flight Research Center, specific hazards associated with these new electric propulsion technologies, including an extensive investigation into the emergency-stop system for a HEIST, and other best practices. In general, the best course of action is to actively design out hazards associated with these systems, but when removing these hazards is either impossible or impractical, other safety protocols including keep-out zones, lock-out/tag-out, and other practices should be implemented.

关键词： NASA

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Framework for NASA Space Relay Satellite Services over the Next Decade: "Development and Demonstration of the Commercial Successors to TDRS " 27

Framework for NASA Space Relay Satellite Services over the N...

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27th Ka and Broadband Communications Conference and the 39th International Communications Satellite systems Conference, ICSSC 2022

作者： Haddad, George Kacpura, Thomas Nessel, James Paulsen, Phillip Drexler, Jonathan Hartman, Eric Hayes, Jeffrey Boldosser, Patrick Systems Engineering and Architecture Division NASA Glenn Research Center ClevelandOH United States Space Flight System Directorate CSP Office NASA Glenn Research Center ClevelandOH United States Advanced High Frequency Branch NASA Glenn Research Center ClevelandOH United States System Architecture and Analytical Studies Branch NASA Glenn Research Center ClevelandOH United States Cost and Economic Analysis Office NASA Glenn Research Center ClevelandOH United States Research and Space Operations Branch NASA Glenn Research Center ClevelandOH United States P.E Astrophysics and Heliophysics Divisions NASA Headquarter WashingtonDC United States Advanced Communications Capabilities for Exploration and Science Office NASA Goddard Space Flight Center GreenbeltMD United States

The United States National Space Policy provides guidance and directives for U.S. Government agencies to purchase commercial space services and capabilities to the maximum extent practical. In alignment with this guidance, the Agency has no plans to replenish the Tracking and Data Relay Satellite System (TDRSS) fleet operated by the Space Communication and Navigation Program (SCaN) and will instead pursue commercial services for communications with spacecraft in near-Earth orbit. The Communications Services Project (CSP) at GRC is leading this commercialization effort and in May 2022 it awarded six contracts to commercial SATCOM companies to demonstrate and validate commercial SATCOM capabilities for future NASA and near space user missions. The responses from the vendors indicated a strong interest in providing commercial services to NASA’s missions and included a wide range of proposed architectures and demonstrations concepts. Overall, the responses indicated that a mature and healthy competitive environment exists with traditional satellite operators and constellation developers to provide NASA and future near space users with commercial communication services in the next five years. This paper will present an overview of the proposed capability coverages, risk spread, and US domestic market stimulation, along with common themes and conclusions. The result of these demonstrations will serve as the basis for acquisition and provision of operational SATCOM services for NASA missions. © 2022 FGM Events LLC. All rights reserved.

关键词： NASA

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