Process control and automation
- Introduction to process control and automation
- Development of process automation
- Fibre process automation
- Chemical recovery as a control object
- Advances in paper machine automation
- Paper machine as a dynamical system
- Tasks in paper machine control and management
- Control of stock flow concentration and quality
- Machine direction control
- Cross-directional control – The static optimisation
- Cross-directional control – Dynamics
- Cross-directional control – further aspects
- Controlling functional paper properties
- Managing grade chances in the paper machine
- Managing disturbances caused by broke and recovered solids
- Millwide systems
- Modelling and control methods
Basic control algorithms Open-loop vs. closed-loop control Open-loop control does not use the measurement of the process variable to be controlled. The effect goes directly from the input or control action to the output, as shown in Figure 1. Closed-loop control uses measurement of the output variable to form a closed loop. The corrections use
Authors & references
Authors:
Professor Emeritus Kauko Leiviskä, University of Oulu
References:
- Payne, L. (2014) The Modern Industrial Workhorse: PID Controllers. Tech Briefs, July 1, 2014. [Online] Available from: https://www.techbriefs.com/component/content/article/tb/features/articles/20013 [Accessed 9th March 2020].
- Kippo, A., Leiviskä, K., Yliniemi, L. and Uronen, P. (1977) Teaching computer control with process simulator. IFAC Symposium Trends in Automatic Control Education. Barcelona, March 30–April 1, 1977
- Wikipedia contributors. Dead-beat control. Wikipedia, The Free Encyclopedia. June 6, 2017. [Online] Available at: https://en.wikipedia.org/wiki/Dead-beat_control [Accessed 9th March, 2020].
- Dahlin, E.B. (1968) Designing and tuning digital controllers. Instruments and Control Systems 41:77-83.
- Higham, J.D. (1968) Single term control of first- and second-order processes with dead time. Control. Feb. 1968, pp. 135-140.
- Meyer, C.B. and Jutan, A. (1980) A sampled data controller for processes with time delay and load disturbances. In Digital Computer Applications to Process Control: Proceedings of the 6th IFAC/IFIP Conference, Düsseldorf, F. R. Germany, 14–17 October 1980.
- Zhang, W.-D., Sun, X.-X. and Xu, X.-M. (1998) Robust digital controller for processes with dead times: New results. IEE Proceedings online no. 19981854, s. 159-164.
- Mosler, H. A., Koppel, L. B. and Coughanowr, D. R. (1967) Process control by digital compensation. AICHE J. 13(4):768.
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Exercises
This page has been updated 24.11.2020