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Conference on Digital Avionics systems (DASC)

作者： Kapil Sheth Seth Schisler Todd Stinchfield Robert Winsor Hayden Klopp Geoffrey Landis Lee Kohlman David Pike Trajectory Dynamics and Controls Branch NASA Ames Research Center Moffett Field USA Project Management Division NASA Ames Research Center Moffett Field USA Science and Engineering Analysis TacitEdge/DARPA Arlington USA Power Management and Distribution Branch NASA Glenn Research Center Cleveland USA Power Technology Division NASA Glenn Research Center Cleveland USA Propulsion Systems Analysis Branch NASA Glenn Research Center Cleveland USA

A concept of operations is presented in this paper for beaming of microwave power to extend battery charge of an electric air vehicle. Critical aspects of airspace operations and power beam charging are addressed. Three classes of electric Vertical Take-Off and Landing vehicle models are considered for recharging. The effects of transmitter frequency, antenna size, and beam width are analyzed. Based on past experiments in the industry, a 2.5 kW power beam is considered. A no-drag rectifying antenna under the belly of the vehicle is selected along with the conversion efficiency, power density, and its size. The combined efficiency of the transmit/receive system as well as the beam containment values are addressed. These parameters are chosen to assess viability and feasibility of the energy augmentation method to establish safety for humans on-board from exposure to the transmitted energy. NASA will test the concept of operations in a laboratory experiment with parameters selected and presented in this paper.

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NASA’s nuclear thermal propulsion project

NASA’s nuclear thermal propulsion project

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AIAA SPACE Conference and Exposition, 2015

作者： Houts, Michael G. Mitchell, Doyce P. Kim, Tony Emrich, William J. Hickman, Robert R. Gerrish, Harold P. Doughty, Glen Belvin, Anthony Clement, Steven Borowski, Stanley K. Scott, John Power, Kevin P. NASA Marshall Space Flight Center MSFC AL35812 United States US Department of Energy WashingtonDC20585 United States US Department of Energy National Nuclear Security Adminstration Las VegasNV89193 United States NASA Glenn Research Center ClevelandOH44135 United States NASA Johnson Space Center HoustonTX77058 United States NASA Stennis Space Center MS39529 United States Technology Development and Transfer Office/ZP30 United States Propulsion Research and Technology Branch/ER24 United States Metal Joining and Processes Branch/EM32 United States Propulsion Systems Design and Integration Division/ER20 United States Propulsion and Research Technology Branch /ER24 United States Space and Defense Power Systems Department of Energy/NE75 United States /NNSA United States Propulsion and Controls Systems Analysis/86:124 United States Direct Energy Conversion /EP311 United States Engineering Test Directorate/EA61 United States

ISBN: (纸本)9781624103346

The fundamental capability of Nuclear Thermal propulsion (NTP) is game changing for space exploration. A first generation NTP systemcould provide high thrust at a specific impulse above 900 s, roughly double that of state of the art chemical engines. Characteristics of fission and NTP indicate that useful first generation systems will provide a foundation for future systems with extremely high performance. The role of a first generation NTP in the development of advanced nuclear propulsion systems could be analogous to the role of the DC- 3 in the development of advanced aviation. Nuclear propulsion can be affordable and viable compared to other propulsion systems and must overcome a biased public fear due to hyperenvironmentalism and a false perception of radiation and explosion risk. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.

关键词： Nuclear propulsion

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Performance evaluation of a high bandwidth liquid fuel modulation valve for active combustion control

Performance evaluation of a high bandwidth liquid fuel modul...

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50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

作者： Saus, Joseph R. DeLaat, John C. Chang, Clarence T. Vrnak, Daniel R. NASA Glenn Research Center at Lewis Field Cleveland OH 44135 United States Controls and Dynamics Branch MS 77-1 21000 Brookpark Rd. United States Combustion Branch MS 5-10 21000 Brookpark Rd. United States Propulsion and Control Systems Engineering Branch MS 86-1 21000 Brookpark Rd. United States

At the NASA Glenn Research Center, a characterization rig was designed and constructed for the purpose of evaluating high bandwidth liquid fuel modulation devices to determine their suitability for active combustion control research. Incorporated into the rig's design are features that approximate conditions similar to those that would be encountered by a candidate device if it were installed on an actual combustion research rig. The characterized dynamic performance measures obtained through testing in the rig are planned to be accurate indicators of expected performance in an actual combustion testing environment. To evaluate how well the characterization rig predicts fuel modulator dynamic performance, characterization rig data was compared with performance data for a fuel modulator candidate when the candidate was in operation during combustion testing. Specifically, the nominal and off-nominal performance data for a magnetostrictive-actuated proportional fuel modulation valve is described. Valve performance data were collected with the characterization rig configured to emulate two different combustion rig fuel feed systems. Fuel mass flows and pressures, fuel feed line lengths, and fuel injector orifice size were approximated in the characterization rig. Valve performance data were also collected with the valve modulating the fuel into the two combustor rigs. Comparison of the predicted and actual valve performance data show that when the valve is operated near its design condition the characterization rig can appropriately predict the installed performance of the valve. Improvements to the characterization rig and accompanying modeling activities are underway to more accurately predict performance, especially for the devices under development to modulate fuel into the much smaller fuel injectors anticipated in future lean-burning low-emissions aircraft engine combustors.

关键词： Bandwidth

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Concurrent mission and systems design at NASA Glenn Research Center: The origins of the COMPASS team

Concurrent mission and systems design at NASA Glenn Research...

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AIAA SPACE Conference and Exposition 2011

作者： McGuire, Melissa L. Oleson, Steven R. Sarver-Verhey, Timothy Mission Design and Analysis Branch MS 105-3 NASA Glenn Research Center Cleveland OH 44135 United States Mission Design and Analysis Branch MS 142 NASA Glenn Research Center Cleveland OH 44135 United States Propulsion and Controls Systems Engineering Branch MS 105-3 NASA Glenn Research Center Cleveland OH 44135 United States

ISBN: (纸本)9781600869532

Established at NASA Glenn Research Center (GRC) in 2006 to meet the need for rapid mission analysis and multi-disciplinary systems design for in-space and human missions, the Collaborative Modeling for Parametric Assessment of Space systems (COMPASS) team is a multidisciplinary, concurrent engineering group whose primary purpose is to perform integrated systems analysis, but it is also capable of designing any system that involves one or more of the disciplines present in the team. The authors were involved in the development of the COMPASS team and its design process, and are continuously making refinements and enhancements. The team was unofficially started in the early 2000's as part of the distributed team known as Team JIMO (Jupiter Icy Moons Orbiter) in support of the multi-center collaborative JIMO spacecraft design during Project Prometheus. This paper documents the origins of a concurrent mission and systems design team at GRC and how it evolved into the COMPASS team, including defining the process, gathering the team and tools, building the facility, and performing studies.

关键词： systems analysis

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A high-fidelity simulation of a generic commercial aircraft engine and controller

A high-fidelity simulation of a generic commercial aircraft ...

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46th AIAA/ASME/SAE/ASEE Joint propulsion Conference and Exhibit

作者： May, Ryan D. Csank, Jeffrey Lavelle, Thomas M. Litt, Jonathan S. Guo, Ten-Huei ASRC Aerospace Corp. Cleveland OH 44135 United States N and R Engineering and Management Services Cleveland OH 44130 United States NASA Glenn Research Center Cleveland OH 44135 United States Propulsion and Control Systems Analysis Branch United States Controls and Dynamics Branch United States

A new high-fidelity simulation of a generic 40,000 pound thrust class commercial turbofan engine with a representative controller, known as C-MAPSS40k, has been developed. Based on dynamic flight test data of a highly instrumented engine and previous engine simulations developed at NASA Glenn Research Center, this non-proprietary simulation was created especially for use in the development of new engine control strategies. C-MAPSS40k is a highly detailed, component-level engine model written in MATLAB/Simulink. Because the model is built in Simulink, users have the ability to use any of the MATLAB tools for analysis and control system design. The engine components are modeled in C-code, which is then compiled to allow faster-than-real-time execution. The engine controller is based on common industry architecture and techniques to produce realistic closed-loop transient responses while ensuring that no safety or operability limits are violated. A significant feature not found in other non-proprietary models is the inclusion of transient stall margin debits. These debits provide an accurate accounting of the compressor surge margin, which is critical in the design of an engine controller. This paper discusses the development, characteristics, and capabilities of the C-MAPSS40k simulation.

关键词： Controllers

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Evaluation, selection, and application of model-based diagnosis tools and approaches

Evaluation, selection, and application of model-based diagno...

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2007 AIAA InfoTech at Aerospace Conference

作者： Poll, Scott Patterson-Hine, Ann Camisa, Joe Nishikawa, David Spirkovska, Lilly Garcia, David Hall, David Neukom, Christian Sweet, Adam Yentus, Serge Lee, Charles Ossenfort, John Mengshoel, Ole J. Roychoudhury, Indranil Daigle, Matthew Biswas, Gautam Koutsoukos, Xenofon Lutz, Robyn NASA Ames Research Center Moffett Field CA 94035 United States QSS Group Inc. Perot Systems Government Services Moffett Field CA 94035 United States SAIC Moffett Field CA 94035 United States RIACS Moffett Field CA 94035 United States Vanderbilt University Nashville TN 37235 United States Jet Propulsion Lab. Caltech. Iowa State University Ames IA 50011 United States ADAPT Discovery and Systems Health MS 269-1 United States Discovery and Systems Health MS 269-4 United States Electronic Systems and Controls Branch MS 213-2 United States Department of Electrical Engineering and Computer Science Institute for Software Integrated Systems United States Department of Computer Science

ISBN: (纸本)1563478935

Model-based approaches have proven fruitful in the design and implementation of intelligent systems that provide automated diagnostic functions. A wide variety of models are used in these approaches to represent the particular domain knowledge, including analytic state-based models, input-output transfer function models, fault propagation models, and qualitative and quantitative physics-based models. Diagnostic applications are built around three main steps: observation, comparison, and diagnosis. If the modeling begins in the early stages of system development, engineering models such as fault propagation models can be used for testability analysis to aid definition and evaluation of instrumentation suites for observation of system behavior. Analytical models can be used in the design of monitoring algorithms that process observations to provide information for the second step in the process, comparison of expected behavior of the system to actual measured behavior. In the final diagnostic step, reasoning about the results of the comparison can be performed in a variety of ways, such as dependency matrices, graph propagation, constraint propagation, and state estimation. Realistic empirical evaluation and comparison of these approaches is often hampered by a lack of standard data sets and suitable testbeds. In this paper we describe the Advanced Diagnostics and Prognostics Testbed (ADAPT) at NASA Ames Research Center. The purpose of the testbed is to measure, evaluate, and mature diagnostic and prognostic health management technologies. This paper describes the testbed's hardware, software architecture, and concept of operations. A simulation testbed that accompanies ADAPT, and some of the diagnostic and decision support approaches being investigated are also discussed.

关键词： Intelligent systems

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MAKING PIPING systems FIRE-SAFE - SIMPLE SOLUTIONS FOR PREVENTING A DISASTER

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 285-295页

作者： BHASIN, V NILSEN, L GUPTA, K CONROY, D Vinod Bhasin P.E.:is a fellow engineer with the Westinghouse Electric Corporation machinery technology division Pittsburgh Pa. He has more than 19 years of experience in the supervision design application and testing of valves and actuators and has taught courses in solids mechanics for 10 years at Illinois Institute of Technology Chicago Il. Mr. Bhasin has written articles for the valve industry where he has been active in standards societies. He holds BS and MS degrees in mechanical engineering and an MS in industrial engineering. Mr. Bhasin is a member of the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM). He is co-chairman of the shipbuilding piping component subcommittee ASTM F25.13 and is also chairing three other task groups under ASTM F25. Lloyd Nilsen P.E.:is the piping components branch head for NavSea. His career with NavSea includes 33 years of ship design construction and repair experience. He has held various positions in the power piping design division human factors manning and controls integration branch and submarine machinery systems branch. He has a BS degree in marine engineering from N.Y. State Maritime. Mr. Nilsen is also a member of the NavSea Association of Scientists and Engineers and a registered licensed professional engineer in Virginia and Washington D.C. Karan Gupta P.E.:is a senior engineer with the Westinghouse Electric Corporation Machinery Technology Division Pittsburgh Pa. Prior to joining Westinghouse he was employed by Elliott Company Jeannette Pa. for 12 years as a metallurgical engineer. He has more than 25 years experience in metallurgical engineering including material selection and brazing and welding of piping pressure vessels and turbines. Mr. Gupta has BS and MS degrees in metallurgical engineering. He is a member of the American Welding Society (AWS) and is active in AWS filler metal subcommittee A5A. He is also a member of ASM International. Dennis Conroy: is a chemical engineer

Loss of life and property losses totaling tens of billions of dollars have piping engineers scrambling to specify ''fire-safe'' components in fire-prone locations: on board ships, and in power plants, refineries, and other perilous applications. Fire-safe valves, the first line of defense in containing a fire, were introduced some 25 years ago, with fire-safe actuators following soon afterwards. Little attention has been given, however, to designing and selecting the other piping components such as flanges, gaskets, bolting, and fittings to ensure their integrity in a fire. Just like in an electric circuit where, if a single component in series fails, the flow of electricity stops;likewise, the failure of a single piping component could result in a fire of catastrophic proportions. This paper discusses the availability of critical fire-safe components for Navy shipboard piping systems and provides some simple solutions which, if implemented, could prevent such a disaster. Discussion is provided on how a fire starts and how it reaches catastrophic proportions, the definitions of survivability and fire-safe components, materials of construction, component design, fire-safe valves and actuators, gaskets, pipe flanges, flange bolting, pipe fittings and unions, brazing and welding, insulation, composite piping materials, and other related subjects. Details are also provided on 78 fires that have occurred on Navy surface ships in the last ten years and their causes.

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AN OVERVIEW OF THE ROLE OF THE NAVSEA HUMAN-FACTORS engineering PROGRAM IN SHIP DESIGN

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NAVAL ENGINEERS JOURNAL 1983年第4期95卷 139-152页

作者： STEIN, NI BENEL, RA MALONE, TB Mr. Norman I. Stein:received his degree in mechanical engineering from the University of Iowa in 1943. MK Stein began his career with the Bureau of Ships Department of the Navy. After his military service with the Army of Occupation in Japan he has held positions with the Corps of Engineering Atomic Energy Commission Walter Reed Army General Hospital and the Protective Structures Development Center Department of the Army. He returned to the Naval Sea Systems Command in 1967 and is currently with the Manning and Controls Integration Branch SEA 55 W16. Mr. Stein is a registered professional engineer in New York state and also is a certified fallout shelter analyst with the Department of the Army. He has authored a comprehensive study on air distribution studies in multi-room shelters presentedpapers on human factors engineering to the Association of Scientists and Engineers and recently contributed a chapter on human factors engineering which will be incorporated in the proposed Naval Sea Systems Handbook on Surface Ship Design. Russell A. Benel:received his Ph. D. in engineering psychology from the University of Illinois at Urbana-Champaign. He is currently a Senior Research Scientist with Essex Corporation where he is the manager of the Man-Machine Systems Department. He has been responsible f o r scientific studies associated with the Human Factors Engineering f o r ships program under contract to the Naval Sea Systems Command specifically the development application and validation of human factors engineering technology f o r surface ship systems such as aircraft launch and recovery propulsion engineering combat direction weapons and total ship systems. He is currently providing Human Factors Engineering Support on the DDG-51. His other activities include a variety of research development test and evaluation activities for military systems. He had been with the Crew Performance Branch of the Crew Technology Division at the USAF School of Aerospace Medicine as a National Research Council Postd

This paper provides a context within which the role of human factors engineering (HFE) for Naval ship design may be understood. HFE is defined and its history as part of engineering design teams is traced. The role of HFE in ship systems design is defined, and the HFE Technology for Ships Program, managed by SEA 061R, is described. The rationale for inclusion of HFE in the design process is presented, the methodology whereby it is incorporated into the design process is detailed, methodology to assess the application of HFE is outlined, and the benefits that will accrue as a result of inclusion of HFE considerations in the design process are documented. The counterpoint to inclusion is illustrated through instances of design-induced human errors. A specific application of HFE in the acquisition process is illustrated through use of the Landing Craft, Air Cushion HFE program plan. The difficulties which may be encountered as the size of the target system expands are described. Potential roadblocks to the required incorporation of HFE are examined for their source and possible ameliorative steps.

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engineering OPERATIONAL SEQUENCING SYSTEM

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NAVAL ENGINEERS JOURNAL 1970年第6期82卷 65-&页

作者： CALOGERO, R MCMANUS, D Robert Calogero graduated from the University of Maryland with a Bachelor of Science in Electrical Engineering in February 1965. He entered the Magnetic Defense Section of Propulsion Power and Auxiliary Systems Division of the Naval Ship Engineering Center where he had previously served as a summer student engineering aid. In December 1968 he transferred to the Maintenance Management Branch of NAVSHIPS where he assumed responsibility as Manager of the Operational Sequencing System. Calogero is presently in the Engineering Administration Program offered at the George Washington University and is a member of the Association of Senior Engineers of the Naval Ships Systems Command. Donald McManus graduated from the Maine Maritime Academy in 1954 and received his Bachelor of Marine Science Degree Commission in the U. S. Naval Reserve and a USCG Marine Engineer's license. After graduation he sailed as a licensed engineer aboard steam and diesel powered tankers and “dry cargo” vessels engaged in worldwide commercial trade. Upon release from active duty in 1958 he was employed for the next eight and one-half years at the Sun Shipbuilding and Drydock Co. Chester Pa. in various engineering capacities. McManus came to the Naval Ship Engineering Center in December 1966 and is presently employed as a Marine Engineer in the Control Section of Machinery Arrangement and Controls Branch. He is a member of the Association of Senior Engineers of the Naval Ship Systems Command.

The many varied types of engineering plants extent in today's modern Navy requires an ever creasing range and depth of operational knowledge by engineering personnel at all levels of shipboard operations. The engineering Operational Sequencing System (EOSS) provides each of these levels with the required information to enable the engineering plant to respond to any demands placed upon it which are within its design capability. The engineering Operational Sequencing System is a set of systematic and detailed written procedures utilizing charts, instructions and diagrams which provide the information required for the operation of a shipboard propulsion plant. The purpose of this paper will be to define and discuss the EOSS; to describe the system background, current status and future implementation plans.

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