Table 6.
Diagnosis of Fault 8 at Sample Bin 40 via One-step Rolling, Two-step Rolling, and Evolving Time Horizon based Analysis. (HPV: historic process variable, HPB: historic process behavior, CPV: current process variable)
| Approach | Sample Bin 40 | |||
|---|---|---|---|---|
| Feature Rank | Feature Type | Corresponding Time Point | Feature Name | |
| One-step Rolling Time Horizon | 1 | HPB | 391-400 | Slope of Cumulative Acid Flow Rate |
| 2 | HPB | 391-400 | Standard deviation in Cumulative Acid Flow Rate | |
| Two-step Rolling Time Horizon | 1 | HPB | 381-390 | Slope of Cumulative Acid Flow Rate |
| 2 | HPB | 381-390 | Standard deviation in Cumulative Acid Flow Rate | |
| 3 | HPB | 381-390 | Mean of Cumulative Acid Flow Rate | |
| 4 | CPV | 400 | Dissolved CO2 Concentration | |
| Evolving Time Horizon | 1 | HPB | 51-60 | Mean of pH |
| 2 | HPB | 31-40 | Mean of pH | |
| 3 | HPB | 61-70 | Mean of pH | |
| 4 | HPB | 71-80 | Slope of Cumulative Acid Flow Rate | |
| 5 | HPB | 71-80 | Standard deviation in Cumulative Acid Flow Rate | |
| 6 | HPB | 141-150 | Mean of Cumulative Acid Flow Rate | |
| 7 | HPB | 151-160 | Mean of Cumulative Acid Flow Rate | |
| 8 | HPB | 81-90 | Slope of Cumulative Acid Flow Rate | |
| 9 | HPB | 161-170 | Mean of Cumulative Acid Flow Rate | |
| 10 | HPB | 171-180 | Mean of Cumulative Acid Flow Rate | |
| 11 | HPB | 131-140 | Mean of Cumulative Acid Flow Rate | |
| 12 | HPB | 61-70 | Slope of Cumulative Acid Flow Rate | |