Category: Cascade Control Cascade Rule Interaction Resonance Disturbances PID Controllers PID Tuning Tips
Submitted by Greg McMillan on Wed, 04/15/2015 - 21:25
Most of the control literature focuses on minimizing the integrated absolute error (IAE) for a step disturbance, often in a linear system. In the process industry, there are many other objectives and complications that require special attention.
Submitted by Greg McMillan on Fri, 10/18/2013 - 11:37
If there were no unmeasured disturbances, feedback control would not be necessary. Process engineers and operators could home in on the best PID output and just leave it at this value. In fact many process engineers are much more comfortable with setting a stream flow per a process flow diagram...
Category: Tips Temperature Control pH Control Cascade Control Flow Feedforward Composition Control Control Strategy Interaction Flow Measurement Pressure Control Level Control
Submitted by Greg McMillan on Fri, 04/05/2013 - 01:56
We continue this series with the steps for designing control strategies. Simple rules of thumb will be offered for setting up cascade, composition, flow, level, pH, pressure, and temperature control systems. Examples of common unit operations will help provide understanding of the steps involved.