The valve was instrumented and tested on a test bench. Two types of cycles, full and partial strokes. Anomalies were artificially produced by over-tightening certain parts of the valve.
The customer wanted to detect deficient cycles when certain parts were over-tightened.
DiagFit detected the deficient cycles.
TNR = True negative rate
TPR = True positive rate
(These are the detection rates for healthy and non-healthy data respectively)
Complete cycles: TNR 83% and TPR: 92
Partial cycles: TNR 98% and TPR 45%.