Excel Engineering Newsletter
Excel Engineering 2017 Technical Conference
Our 12th annual Technical Conference will be held on Thursday, February 9th, 2017 at the Shoreview Community Center in Shoreview, MN.
Invitations will be sent out via email in mid-December 2016. If you are interested in speaking, have topic suggestions or would like to be added to the invitation list, please contact Krista Nielsen at email@example.com.
Back to Basics: Modeling and Scaling Feedforwards
By Wayne Salo
Depending on the complexity and precision requirements of the process, the resulting control arrangement can range from simple “Process Value > Controller > Manipulated Variable control” to a feedforward or cascade control. In this paper I will discuss the considerations when to utilize feedforwards, cascades and the scaling associated with these control additions.
The areas that will be covered are:
• Why use feed forwards and when feed forwards are useful.
• Simple modeling of feed forwards
• Creating feed forwards from historical data
• More complex modeling of feed forwards
• Advanced modeling
• Cascade Control
1 Simple and Feedforward Control arrangement decisions
1.1 Selection of Simple Control Arrangement
1.1.1 Simple Signal Analysis
For those individuals that analyze control systems in a mathematical fashion, a simple, generic, process diagram reflecting a typical process is shown below.
Figure 1 – Typical Simple Physical Process
This process diagram above indicates a source for the process, a manipulated variable that controls the flow of mass, energy or chemical balance into the system, a process that modifies the source and a measurement of the results requiring control. It should also be noted that there are potential disturbances to the process.
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Please contact Krista Nielsen at firstname.lastname@example.org with questions.
Visit the White Papers page of our website for this article, as well as other content provided by our associates at http://test.exceleng.net/index.php/whitepapers/.
We would like to congratulate the following employees on recent anniversaries with Excel Engineering. We appreciate your commitment to Excel!
We are pleased to announce the addition of several new employees to the Excel organization.
James Moua joined Excel Engineering in January 2016 with five years of experience in electrical design. James has a degree in Manufacturing Engineering Technology from Hennepin Technical College. He is using his education and experience in his current role as an electrical designer performing design and modifications for electrical control panel schematics and layouts.
Controls & Automation
Eric Swanberg joins the process controls group as a controls engineer with process and automation experience in the pharmaceutical and nutritional industries. He worked in process operations of clinical drug production for Johnson & Johnson and has performed process commissioning work for a large-scale buffer formulation system at Merck (both in the Philadelphia area), and most recently has worked for a control system integrator in the Cleveland metro area where he has experience with Rockwell RSLogix500/5000, FTBatch, FTView, and various historians and MES platforms. Eric attended the South Dakota School of Mines and Technology, graduating with a B.S. in Chemical Engineering.
Tony McGinnity has over 25 years of accounting experience in both the manufacturing and retail / wholesale industries. Prior to joining Excel Engineering in June 2016, Tony was the controller of AIS – All Integrated Solutions in New Brighton. Tony’s broad experience covers everything from purchasing/sourcing to financial statement preparation. Having worked for many smaller companies, he has worn many hats in his previous positions.
Tony received his undergraduate degree from The University of Saint Thomas and an MBA from The Carlson School of Management at the University of Minnesota. Tony has spent his entire life in Minnesota, growing up in Roseville and currently living in Arden Hills. Tony is married to Alison and they have a son, daughter and two Labrador retrievers. Tony enjoys the outdoors, hiking, biking, hunting and tapping maple trees in the spring.
Industrial Client Services
Lisa Coyle – Engineering Administrator
Marina Kaplun – Engineer/Chemist
Robert Irvine – Process Safety and Mechanical Integrity Consulting Engineer
Alissa Vander Vorst – Engineering Coordinator
Lyle Gave – Principal Electrical Owner’s Rep
John Davis retired from 3M Company with 27 years in Plant Engineering, and having worked in manufacturing machine maintenance and repair for over 35 years. He is a multi-craft technician whose duties included troubleshooting, preventive and predictive maintenance, repair, modification, and upgrades of plant equipment. Some of the products that John has worked in the manufacture of include cosmetics, cleaning solutions, frozen food products, X-ray and graphic arts films, fiber optic products, and various electrical connectors.
Utility Client Services
Ray Gagnon – Utilities Construction and Operations Rep