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. Author manuscript; available in PMC: 2019 Jul 12.
Published in final edited form as: Comput Chem Eng. 2018 Mar 28;115:46–63. doi: 10.1016/j.compchemeng.2018.03.025

Table 7.

Diagnosis of Fault 8 at Sample Bin 80 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 80
Feature Rank Feature Type Corresponding Time Point Feature Name
One-step Rolling Time Horizon 1 HPB 791-800 Mean of pH
2 HPV 794 Hot/cold Switch
Two-step Rolling Time Horizon 1 HPB 781-790 Mean of pH
2 HPB 791-800 Mean of pH
3 HPV 787 Hot/cold Switch
4 HPV 787 Feed Rate
5 HPV 788 Fermentation Volume
6 HPV 788 Dissolved O2 Concentration
7 HPV 788 pH
8 HPV 787 Cumulative Base Flow Rate
9 HPV 787 Cooling/heating Medium Flow Rate
Evolving Time Horizon 1 HPB 301-310 Standard deviation in Cumulative Acid Flow Rate
2 HPB 301-310 Slope of Cumulative Acid Flow Rate
3 HPB 291-300 Standard deviation in Cumulative Acid Flow Rate
4 HPB 291-300 Slope of Cumulative Acid Flow Rate