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Alex D. Kalafatis
Researcher at Aspen Technology
Publications - 4
Citations - 268
Alex D. Kalafatis is an academic researcher from Aspen Technology. The author has contributed to research in topics: Linearization & Recursive least squares filter. The author has an hindex of 3, co-authored 4 publications receiving 264 citations.
Papers
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Journal ArticleDOI
Identification of Wiener-type nonlinear systems in a noisy environment
TL;DR: In this paper, the frequency response for the linear subsystem and the inverse of the static nonlinearity were used to identify Wiener systems in a noisy environment, where a variety of input excitation signals, including random binary and periodic, can be used with the proposed method.
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Linearizing feedforward-feedback control of pH processes based on the Wiener model
TL;DR: In this paper, the authors examined the control of pH processes based on the Wiener model construct (a dynamic linear element representing the mixing dynamics of the process in series with a static nonlinearity representing the titration curve).
Journal ArticleDOI
Identification of time-varying pH processes using sinusoidal signals
TL;DR: This paper presents an approach to the identification of time-varying, nonlinear pH processes based on the Wiener model structure that produces an on-line estimate of the titration curve, where the shape of this static nonlinearity changes as a result of changes in the weak-species concentration and/or composition of the process feed stream.
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Design of an On-Line Titrator for Nonlinear pH Control
TL;DR: In this article, a new on-line titrator for pH control has been developed, which generates an estimate of the inverse titration curve as a continuous smooth function eliminating the need for selection of the important break points of the titration curves.