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Facilitating All Levels of Design Architecture

The eXpress Diagnostics Model is effective for all levels of the design architecture and can be expanded or enriched to facilitate the Diagnostic Design or the Sustainment objectives at any time.

The approach for initiating or the enriching the diagnostic effectiveness of any design begins with identifying where we are in the design or support lifecycles as well as understanding our diagnostic or sustainment requirements or objectives. The eXpress model provides diagnostic expertise regardless of where we are in the design or sustainment lifecycles and for any sustainment implementation.

The contextual usage of the terms “System”, “System Level” and “Integrated System” become relevant in this discussion to associate a sense of “when” and “where” any contributing design piece (replaceable component or entity grouping) or collection of design pieces (assemblies, sub-systems, etc.) are “integrated” into the diagnostic hierarchy of the “Integrated System”, or fielded design.

Top-Down Hierarchy

Bottom-Up Hierarchy

System of Systems (SoS) Component or Board-Level Assessments
Full Vehicle/Product Assessments Subsystem-Level Assessments
Subsystem-Level Assessments Full Vehicle/Product Assessments
Component or Board-Level Assessments System of Systems (SoS)

Functional Design Requirements Flow Down – Failure Data (causes or effects) Propagate Upward

New Design Applications

Top-Down eXpress Diagnostics Engineering

New Designs create the highest opportunity for extracting maximum short term and long term value from applying eXpress within the ISDD Process. When started up very early during the design development process, functional requirements can be allocated to lower levels of the design long before the parts are selected enabling many diagnostic trade-off analyses to be performed.

As the design development proceeds, the diagnostic assessments can be “pinged” from the evolving eXpress model(s) as any time. This unmatched capability fully accommodates iterative design development, offering unmatched opportunities to spot diagnostically troubling areas in both the design and in the operational environments long in advance to provide valuable feedback into the design development lifecycle.

Using eXpress at its fullest form, enables the ISDD process to fully exploits the data fitness and the interdisciplinary design data regiments throughout the related design and sustainment disciplines.

“Pushing Down” Requirements from the Higher Levels of Design

Inside the eXpress modeling paradigm, functional (diagnostic) requirements can be established at the system level and flowed down to lower levels of the design. This is typically performed from the system level using unique facilities within eXpress to aid in the validating of the lower-level detail mapping correctly to the next higher-level requirements, and to the System-Level Requirements.

Bottom-Up eXpress Diagnostic Engineering

New Designs that begin later during Design Development can still add value to the design development and sustainment lifecycles. While the infusion of ISDD after the parts have already been selected compromises the extensiveness of the design influence capability, which is a factor that is determined by how far along the design decisions have been frozen, there is still much to be gained. For example, the diagnostic capability of the design and any lower level contained in the integrated systems’ design can be evaluated and fully assessed. This will still allow for diagnostic strategy alternatives to be weighed and many turn-key system level assessment products to be produced with a push of a button!

And if that wasn’t enough, many interrelated turn-key assessment products can be produced (including FMECA’s, FTA’s, etc.), provided on the elaboration of the data that can be imported into the eXpress model(s) for any piece of the design architecture.

Legacy Design Applications

Bottom-Up eXpress Diagnostic Engineering

For legacy, or existing designs that are currently fielded, folks underestimate the value of discovering the diagnostic capability of their existing design. There is still tremendous opportunity for value, even though the design is not able to be influence for maximum diagnostic effectiveness. A very brief look at the design will still inject the sustainment effectiveness with unprecedented alternatives, including:

  • Discover the actual diagnostic value of any testing locations or (BIT) sensors used:
  • At the Board-Level
    Across domain boundaries
    At the Subsystem-Level
    In the fielded design(s) or System of Systems (SoS)

  • Capture the design in the eXpress model for future (re)use for:
  • Assessing or developing future updates to the design(s)
    Future variants, technologies

  • Assess the diagnostic integrity (FD/FI) of any contributing design within the design hierarchy
  • Discover the diagnostic impact of COTS or GOTS at a higher design-level
  • Discover the diagnostic value of Health Management or on-board Reasoning implementations
  • Establish alternatives for the Run-Time implementation of the Diagnostics
  • Immediately improve the diagnostic accuracy for use in:
  • Guided Troubleshooting environments
    With Automated Test Equipment (ATE)
    Reducing the Skill level requirements of field or production technicians

The eXpress models will be relatively quick to establish since the documentation is fixed and the fielded design is not expecting to be in a flux. The eXpress models will typically expose many unknown diagnostic design gaps between the various levels of the design hierarchy or within any contributing piece of the design.

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