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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Analysis of Seismoacoustic Data for the Operational Status of Two Nuclear Reactors
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A Uniform Taxonomy for PV System Operations and Maintenance Data
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A Uniform Taxonomy for Photovoltaic System Operations and Maintenance Data
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O&M KPIs: Uncertainty due to data loss and operational issues
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Preliminary analysis for lunar roving vehicle study, ground data systems and operations. Volume 1 - Roving vehicle guidance /Remote driving study/
Remote driving of lunar roving vehicle by superimposing driving aids on TV panorama
Preliminary analysis for lunar roving vehicle study, ground data systems and operations. Volume 2 - Roving vehicle payload /Science mode time line analyses/
Stationary science time line analyses for roving vehicle payload
Preliminary analysis for lunar roving vehicle study, ground data systems and operations. Volume 3 - Roving vehicle navigation Elevation determination analyses/
Elevation determination analyses for lunar roving vehicles
Screwworm Eradication Data System (SEDS) operational manual, part 3
All phases of SEDS operation as well as utility routines, error messages, and system disk maintenance procedures are described. Display layouts and examples of runs are included as additional explanation to SEDS program procedures.
Experimental program for the operational study of data collection platforms in Bolivia
The system developed for the SMS/GOES satellite while learning the limitations possessed by this system with regard to the LANDSAT 1 and 2 satellites with respect to the transmission distance and horizon angle is investigated. The advantages possessed by this system in comparison with conventional methods are evaluated so as to permit studying the feasibility of introducing it into this country in the near future.
The use of wind data with an operational wind turbine in a research and development environment
The status of the use of wind information is presented in four areas, namely: operational control, design verification, power performance analysis, and lifetime estimation. Attention is given to some of the identified wind information needs and the steps taken to meet these needs.
Astronomical Data Center Bulletin, volume 1, number 2
Work in progress on astronomical catalogs is presented in 16 papers. Topics cover astronomical data center operations; automatic astronomical data retrieval at GSFC; interactive computer reference search of astronomical literature 1950-1976; formatting, checking, and documenting machine-readable catalogs; interactive catalog of UV, optical, and HI data for 201 Virgo cluster galaxies; machine-readable version of the general catalog of variable stars, third edition; galactic latitude and magnitude distribution of two astronomical catalogs; the catalog of open star clusters; infrared astronomical data base and catalog of infrared observations; the Air Force geophysics laboratory; revised magnetic tape of the N30 catalog of 5,268 standard stars; positional correlation of the two-micron sky survey and Smithsonian Astrophysical Observatory catalog sources; search capabilities for the catalog of stellar identifications (CSI) 1979 version; CSI statistics: blue magnitude versus spectral type; catalogs available from the Astronomical Data Center; and status report on machine-readable astronomical catalogs.
An enhanced Oct-tree data structure and operations for solid modeling
Oct-trees are enhanced to increase the processing efficiency of geometric operations for interactive CAD use. Further enhancement is made to combine them with surface models for more precise boundary specification as needed by tool path generation in CAM applications.
Towards a general object-oriented software development methodology
An object is an abstract software model of a problem domain entity. Objects are packages of both data and operations of that data (Goldberg 83, Booch 83). The Ada (tm) package construct is representative of this general notion of an object. Object-oriented design is the technique of using objects as the basic unit of modularity in systems design. The Software Engineering Laboratory at the Goddard Space Flight Center is currently involved in a pilot program to develop a flight dynamics simulator in Ada (approximately 40,000 statements) using object-oriented methods. Several authors have applied object-oriented concepts to Ada (e.g., Booch 83, Cherry 85). It was found that these methodologies are limited. As a result a more general approach was synthesized with allows a designer to apply powerful object-oriented principles to a wide range of applications and at all stages of design. An overview is provided of this approach. Further, how object-oriented design fits into the overall software life-cycle is considered.
The integrated analysis capability (IAC Level 2.0)
The critical data management issues involved in the development of the integral analysis capability (IAC), Level 2, to support the design analysis and performance evaluation of large space structures, are examined. In particular, attention is given to the advantages and disadvantages of the formalized data base; merging of the matrix and relational data concepts; data types, query operators, and data handling; sequential versus direct-access files; local versus global data access; programming languages and host machines; and data flow techniques. The discussion also covers system architecture, recent system level enhancements, executive/user interface capabilities, and technology applications.
FMT (Flight Software Memory Tracker) for Cassini Mission Operations - A Ground Data Analysis Tool
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Using Decision Trees to Detect and Isolate Simulated Leaks in the J-2X Rocket Engine
The goal of this work was to use data-driven methods to automatically detect and isolate faults in the J-2X rocket engine. It was decided to use decision trees, since they tend to be easier to interpret than other data-driven methods. The decision tree algorithm automatically "learns" a decision tree by performing a search through the space of possible decision trees to find one that fits the training data. The particular decision tree algorithm used is known as C4.5. Simulated J-2X data from a high-fidelity simulator developed at Pratt & Whitney Rocketdyne and known as the Detailed Real-Time Model (DRTM) was used to "train" and test the decision tree. Fifty-six DRTM simulations were performed for this purpose, with different leak sizes, different leak locations, and different times of leak onset. To make the simulations as realistic as possible, they included simulated sensor noise, and included a gradual degradation in both fuel and oxidizer turbine efficiency. A decision tree was trained using 11 of these simulations, and tested using the remaining 45 simulations. In the training phase, the C4.5 algorithm was provided with labeled examples of data from nominal operation and data including leaks in each leak location. From the data, it "learned" a decision tree that can classify unseen data as having no leak or having a leak in one of the five leak locations. In the test phase, the decision tree produced very low false alarm rates and low missed detection rates on the unseen data. It had very good fault isolation rates for three of the five simulated leak locations, but it tended to confuse the remaining two locations, perhaps because a large leak at one of these two locations can look very similar to a small leak at the other location.
Introductions to Mission Operations and Ground Data Systems
This slide presentation discusses how in the early concept studies the communications architecture plays an important part: The communications architecture is the arrangement, or configuration of satellites and ground systems in a space system, and the network of communications links that transfers information between them.