Overview of Applications Spectrum

 

The key element in this model-based approach is the separation of diagnostic software and test software. Isolation of diagnostic software from test software provides major opportunities not now available from the conventional diagnostics development approaches. The most important benefit is ability to design-in embedded and develop off-line diagnostics concurrent with design evolution. This will save up to 30% of existing test development costs and provide users with effective core diagnostics software applicable to any diverse test platform.

For existing systems, enhancement of diagnostic capability is achieved without hardware change. The Diagnostician software plays a major role in the concurrent design of diagnostics for new systems and the enhancement of diagnostics for legacy systems. The following interactions show this:

 

Interaction with designer to calculate and enhance testability and provide performance monitoring and built-in test (BIT) design priorities to meet system requirements.
Interaction with performance monitor, BIT, instrumentation or data buses to collect and diagnose test information on-line in real-time.
Interaction with "Electronic Technical Information" presentation systems on-line in real- time making the Portable Maintenance Aid intelligent.
Interaction with "system bus (1553)" providing umbilical cord Smart Testers off-line to enhance on-site maintenance in the field.
Interaction with Voice to facilitate "observables" as input for field applications in constrained maintenance environments.
Interaction with production end-to-end performance tests to provide automatic fault isolation in factories.
Interaction with COTS and DoD family of testers to provide automatic fault isolation in real-time without complex diagnostic coded test programs in depots.
Simulation of diagnostics at all maintenance levels for trade-offs and V&V.
Interaction with logistics systems via "RF Links."

Model-based reasoning enables a concurrent engineering approach to all aspects of integrated diagnostics / testability / prognostics development. It also facilitates a program view of all diagnostic elements where these elements can be viewed as a highly distributed subsystem - a diagnostic subsystem. Reasoning software is also ideally suited for overlay on existing products to improve diagnostics.

 

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Last modified: June 30, 2000