Multi-variable processes

Details Multi-variable processes Multi-variable processes

2005-04-12

2005-04-12

Razavi, Michael (Department: 2672)

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

C345S441000

Reexamination Certificate

active

06879325

ABSTRACT:
Control and output-quality variables of a process plant (1) are plotted against parallel axes in a display unit (7). Convex hulls between pairs of variables are calculated from sets of the variable-values accumulated historically in stores (7, 9) during successive runs of the process, and hulls (HH; TC, BC) between successive axis-pairs are displayed. New variable-values for process optimization are fixed for the variables taken in turn, each selection being made within displayed ranges (Rn—Rn) derived from the hulls effective between the respective variable and the variables already fixed. A display unit (13) provides on-line parallel-axis display of variable-values from the plant (1), showing alarm carets (DC, UC) where values violate limits (UL, LL) determined by the convex hulls, and allowing variation in the displayed-value for observing the resultant effect in avoiding alarm situation and towards optimization.

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