by Fred Thomasson
The basic building tool for envelope optimization is the fuzzy logic
Envelope Controller (EC) function block. Such EC blocks are often chained
(or sequenced) one after the other. Each EC in the chain sequence focuses
on a single process variable, with the complete chain forming an efficient
and sophisticated optimization strategy. With such a chain sequence
construction, it is possible to incorporate many constraints. It is not
difficult to add or remove a constraint or change its priority. A
surprisingly small number of fuzzy logic rules can be used to do an
extraordinary amount of reasoning about a process. This attribute allows us
to optimize complex processes with a small amount of logic. In many cases,
the entire design can fit on one sheet of paper. Two optimization examples
are shown later in this article. The first deals with minimizing the amount
of combustion air for an industrial power boiler. The second deals with
minimizing the outlet pressure of a forced draft fan of an industrial power
boiler to minimize energy losses...(there's more)

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http://www.controlguru.com/2007/060607.html

You can read the rest of this article at

http://www.controlguru.com/2007/060607.html