Abstract
Regulation of technological processes has usually the following objective: it tries to find levels of process inputs which lead to a desired process output. Problems occur when such levels are changed when the process is running. In such cases, the levels of the other inputs generally cease to be optimal, and the output level is consequently not desirable either. The paper demonstrates a method which calculates a region optimal for regulation instead of the optimal values . A major advantage of the method is that a change in the value of one of the parameters does not have any effect on the output. If a value of a parameter changes in the optimal region, there is no need to change the other parameters. It is also possible to work with an optimal region, taking into account the minimal variability of the output, as is demonstrated in the paper. The method is illustrated in the field of steel production.
Highlights
It is a fundamental property of every process, including a technological one, that one or more outputs are attached to it, with the outputs being influenced or regulated by inputs
The third column of table 3 shows the sum of squares which is can be calculated for any regression model, and is used for the calculation of the contribution
6 CONCLUSION The methodology just described may be used even for a greater number of outputs, so that the intersection of optimal regions serves as the area for the best possible process regulation with respect to all monitored characteristics
Summary
It is a fundamental property of every process, including a technological one, that one or more outputs are attached to it, with the outputs being influenced or regulated by inputs. A target or optimal value is set for each of the outputs, and tolerances are defined for controllable inputs. The usual objective is to make such adjustments to the inputs that the process outputs are as close as possible to their target values. We describe how to determine an optimal region for the regulation of inputs in metallurgy, the region being called a process regulation map. This map provides one with enough room for process regulation. If the regulation is done within the optimal region, a change in the settings of the process inputs will not affect the optimal state of the process. To find the regulation map, the following steps will be taken and discussed: 1. Process outputs Y1, ... , Ym to be monitored are defined
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