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    Integrated Formulation of Beacon-Based Exception Analysis for Multimissions (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Further work on beacon-based exception analysis for multimissions (BEAM), a method of real-time, automated diagnosis of a complex electromechanical systems, has greatly expanded its capability and suitability of application. This expanded formulation, which fully integrates physical models and symbolic analysis, is described. The new formulation of BEAM expands upon previous advanced techniques for analysis of signal data, utilizing mathematical modeling of the system physics, and expert-system reasoning,
    Keywords: Quality Assurance and Reliability
    Type: NPO-21126 , NASA Tech Briefs, March 2003; 47-48
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Hypothetical Scenario Generator for Fault-Tolerant Diagnosis (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Hypothetical Scenario Generator for Fault-tolerant Diagnostics (HSG) is an algorithm being developed in conjunction with other components of artificial- intelligence systems for automated diagnosis and prognosis of faults in spacecraft, aircraft, and other complex engineering systems. By incorporating prognostic capabilities along with advanced diagnostic capabilities, these developments hold promise to increase the safety and affordability of the affected engineering systems by making it possible to obtain timely and accurate information on the statuses of the systems and predicting impending failures well in advance. The HSG is a specific instance of a hypothetical- scenario generator that implements an innovative approach for performing diagnostic reasoning when data are missing. The special purpose served by the HSG is to (1) look for all possible ways in which the present state of the engineering system can be mapped with respect to a given model and (2) generate a prioritized set of future possible states and the scenarios of which they are parts.
    Keywords: Quality Assurance and Reliability
    Type: NPO-42516 , NASA Tech Briefs, June 2007; 30
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Real-time spatio-temporal coherence estimation for autonomous mode identification and invariance tracking (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A general method of anomaly detection from time-correlated sensor data is disclosed. Multiple time-correlated signals are received. Their cross-signal behavior is compared against a fixed library of invariants. The library is constructed during a training process, which is itself data-driven using the same time-correlated signals. The method is applicable to a broad class of problems and is designed to respond to any departure from normal operation, including faults or events that lie outside the training envelope.
    Keywords: Quality Assurance and Reliability
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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