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Seawolf
Submarine Embedded Diagnostics US Navy Seawolf Submarine – In the deployed Seawolf Submarine, the
Diagnostician performs all fault localization functions for the on-line,
embedded ship control system for steering and diving and depth control. The ship control system is a complex,
quad-redundant system that has extensive cross-strapping through system
elements. Over two hundred hierarchical
models are used to implement the hierarchical diagnostic reasoning strategy.
The application of the Diagnostician to Seawolf saved the Navy millions of
dollars by eliminating millions of
lines of embedded code and by automatically performing 100% Validation and
Verification using simulation techniques.
The diagnostic capability was developed on a fully concurrent basis with
the overall system design. The Seawolf application successfully completed sea
trials in Summer, 1997.
Giordano Automation Corp. was subcontracted by Newport News Shipbuilding for testability design and analysis and the development of embedded diagnostics for the Seawolf Ship Control System. This strategy represents the next generation approach to diagnostics. Giordano Automation Corp., under this contract, developed a model-based reasoner for inclusion in the actual on-board ship control system. In a concurrent engineering environment, design data from Draper Labs was analyzed with the Diagnostic Profiler's Testability Analyzer and the results converted into a dynamic reasoner. The reasoner is then utilized to evaluate on-line sensor data and indicate the current status, including required repairs, deferred repairs and reconfiguration events to correct malfunctions.  |
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