| 摘要 |
<p>Operation of a multi-variable process involves multidimensional representation of the value (p 1 -p 12 ) of the process variables (P 1 -P 12 ) according to individual coordinate axes, and an operational envelope (UB,LB) derived from a group of sets of values for the process and quality variables (P 1 -P 12 ,Q 1 -Q 2 ) accumulated from multiple, earlier operations of the process, defines an operating zone for the process and quality variables of the process. If the current value (p 7 ) of any process variable (P 7 ) goes outside the envelope, an envelope (UO,LB) for a different, wider grouping of the stored data-sets is displayed at least for the quality variables (Q 1 -Q 2 ). A series of nested envelopes to provide stepwise enlargement of the operating zone may be provided, but non-nested envelopes can be used where there is clustering of acceptable values of process variables of the stored data-sets. The changes to control variables to bring the values of dependent variables within a best operating range can be determined.</p> |
