Soft Sensing - Advanced Control and Supervision of Mineral Processing Plants - page 201

Figure 4.23 shows a test of the prediction capabilities of soft sensor (4.146). The
parameters were updated from month 1 to month 30 and the prediction was made
frommonth31to46.
The prediction of W iog using average f 80 and p 80 soft sensor output of Figure
4.23 is given in Figure 4.24.

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10 15 20 25 30 35 40 45

months

Figure 4.23 Soft sensor for p 80 (dotted) and p 80 predicted (black). The soft sensor model is updated
from months 1 to 30 and the prediction is from months 31 to 46

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10 15 20 25 30 35 40 45

months

Figure 4.24 Global operational work index W iog computed using mean f 80 and p 80 inferred by a
soft sensor (solid) and Work Index found by actual f 80 and p 80 though laboratory analysis (dotted).
The soft sensor model is updated from months t − 6to t and the prediction is from t + 1to t + 6