Abstract
In recent years researchers in many areas have used artificial neural networks (ANNs) to model a variety of physical relationships. While in many cases this selection appears sound and reasonable, one must remember than ANN modeling is an empirical modeling technique (based on data) and is subject to the limitations of such techniques. Poor prediction occurs when the training data set does not contain adequate “information” to model a dynamic process. Using data from a simulated continuous-stirred tank reactor, this paper illustrates four scenarios: (1) steady state, (2) large process time constant, (3) infrequent sampling, and (4) variable sampling rate. The first scenario is typical of simulation studies while the other three incorporate attributes found in real plant data. For the cases in which ANNs predicted well, linear regression (LR), one of the oldest empirical modeling techniques, predicted equally well, and when LR failed to accurately model/predict the data, ANNs predicted poorly. Since real plant data would resemble a combination of situations (2), (3), and (4), it is important to understand that empirical models are not necessarily appropriate for predictively modeling dynamic processes in practice.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 11 February 1999
Rights and permissions
About this article
Cite this article
Chen, V., Rollins, D. Issues regarding artificial neural network modeling for reactors and fermenters. Bioprocess Engineering 22, 85–93 (2000). https://doi.org/10.1007/PL00009107
Issue Date:
DOI: https://doi.org/10.1007/PL00009107