One has resort off-line robust parameter design strategies

FIGURE 17.5 The fundamental cycle and operations of a basic genetic algorithm.

product/process quality. In fact, if the rate of change of uncontrollable variables is relatively high in comparison with the process time constant, attempting to perform on-line parameter design might even deteriorate product/process quality in the long term.

3. Uncontrollable variables are observable during production and unit operation. The need for this assumption is rather obvious. If the vast majority of significant uncontrollable variables are unobservable during product/process operation, one has to resort to off-line robust parameter design strategies.

Given the above discussion, the role of a quality controller can be broken into two distinct tasks: product/process identification and product/process parameter design.

17.3.1 Identification Mode

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