A first-order plus deadtime (FOPDT) model is a simple approximation of the dynamic response (the transient or time-response) of a process variable to an influence. It’s also called first-order lag plus deadtime (FOLPDT), or “deadtime” may be replaced with “delay,” changing the acronym to FOLPD. The FOPDT model is often a reasonable approximation to process behavior, and has demonstrated utility for controller tuning rules, for structuring decouplers and feedforward control algorithms, in communicating essential process attributes, and as a computationally simple surrogate model in simulations for training and optimization. There is no claim that the FOPDT model…Full Story
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