Re: Improve Control with Regulatory Level Transformations

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Posted by Don Snowden on November 05, 2000 at 19:29:38:

In Reply to: Re: Improve Control with Regulatory Level Transformations posted by venugopalan on November 03, 2000 at 02:04:03:

Mr. Venugopalan
Controls should be as simple as possible but not at the expense of not gaining all the total benefits. Depending on the type of process, traditional control (e.g. feedforward, lead-lag blocks, etc..) will normally gain 20-30% of the achievable benefits. I am referencing a document Dr. Culter etall. put out several years back (approx 1985). In that document, he said that multivariable control and real time optimization was where the bulk of the benefits were. The plot I have seen is benefits achievable verses cost of the project. (I have that document somewhere and I can look it up for you. Right now I am out of the office). I even saw Honeywell advertising the same claim in the early 1990s. Since that time the industry has proven Dr. Cutler's claim.

In any case, if you let me know what type of process you are dealing with, I can try to be more specific.
Don Snowden

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: Mr. Venugopalan
: Controls should be as simple as possible but not at the expense of not gaining all the total benefits.  Depending on the type of process, traditional control (e.g. feedforward, lead-lag blocks, etc..) will normally gain 20-30% of the achievable benefits.  I am referencing a document Dr. Culter etall. put out several years back (approx 1985).  In that document, he said that multivariable control and real time optimization was where the bulk of the benefits were.  The plot I have seen is benefits achievable verses cost of the project.  (I have that document somewhere and I can look it up for you.  Right now I am out of the office).  I even saw Honeywell advertising the same claim in the early 1990s.  Since that time the industry has proven Dr. Cutler's claim.

: In any case, if you let me know what type of process you are dealing with, I can try to be more specific.
: Don Snowden

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