Full optimization of IVHM takes lots of iterations. Each iteration should converge on a solution. It is beyond the scope of this article (see related stories, below, for more information) to discuss trade-studies, but it is this aspect of performing trade studies in a large-scale system design that is essential to IVHM development.So what are the keys to assessing IVHM in eXpress?
Once some of the basic topology of a design is known, eXpress can be used to provide these statistics:
- Fault Detection and Isolation
- Test Point Utilization and Recommendation
- Fault Group Size and Expected False Removal Statistics
As one progresses, there are more complex statistics that are used to factor in modes of operation, including degraded modes of operation:
- Subset FD/FI Report
- Scope-limited Diagnostic Assessment
- FMECA report, including Detection Method
With these assessments, the next challenge becomes how to use them in such a way to influence decision making at the early point in system development as to make a difference. This is done automatically in eXpress, through its use of data layering.