Monthly Archive: April 2009

Apr
27

What Have I Learned? – Cost and Source of Oscillations (Part 2)

The loops with the most severe oscillations listed in order from biggest amplitude to smallest amplitude are pH loops, level loops, flow loops, pressure loops, batch temperature loops, heat exchanger temperature loops, and column temperature loops. The following is a list of the sources of product quality oscillations in the approximate descending order of frequency …

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Apr
20

What Have I Learned? – Cost and Source of Oscillations (Part 1)

All plants have oscillations. Process control improvement can reduce or eliminate these oscillations. In these days of tight budgets and resources, how do you justify cost and effort to fix the problem? The “before” and “after” distribution and location of process variability depicted in slide 1 in ProcessControlBenefits.pdf is the classic presentation on how tighter …

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Apr
07

What Have I Learned? – Ratio Control (Part 2)

So the question on the minds of automation engineers for process control and even the members of congress for the banks and the economy is how do you fix your model? Will feedback correction be enough? Will the correction arrive too late? How do you deal with a response that is not self-regulating but is …

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Apr
03

Featured Articles

February 2011 Update: A new resources page has been created to make it easier for you to find the articles. http://www.modelingandcontrol.com/articles.html

Apr
03

Books

December 2010 Update: Two new resource pages have been created to make it easier for you to find the books. Books in Print: http://www.modelingandcontrol.com/Books_in_Print.html Online eBooks: http://www.modelingandcontrol.com/Online_eBooks.html

Apr
03

Lectures

New Developments in Modeling and Control Introduction Batch Control Story Virtual Plant Concepts Dynamics Measurement and Control Batch Profile Analysis Model Predictive Control Process Optimization and Control Control Loop Foundation for Batch and Continuous Control (1,036KB PDF) Opportunity Assessment and Advanced Control (1,679KB PDF)