Computer-Aided Nonlinear Frequency Response Method for Investigating the Dynamics of Chemical Engineering Systems.

Živković, Luka A.; Vidaković-Koch, Tanja; Petkovska, Menka

The Nonlinear Frequency Response (NFR) method is a useful Process Systems Engineering tool for developing experimental techniques and periodic processes that exploit the system nonlinearity. The basic and most time-consuming step of the NFR method is the derivation of frequency response functions (FRFs). The computer-aided Nonlinear Frequency Response (cNFR) method, presented in this work, uses a software application for automatic derivation of the FRFs, thus making the NFR analysis much simpler, even for systems with complex dynamics. The cNFR application uses an Excel user-friendly interface for defining the model equations and variables, and MATLAB code which performs analytical derivations. As a result, the cNFR application generates MATLAB files containing the derived FRFs in a symbolic and algebraic vector form. In this paper, the software is explained in detail and illustrated through: (1) analysis of periodic operation of an isothermal continuous stirred-tank reactor with a simple reaction mechanism, and (2) experimental identification of electrochemical oxygen reduction reaction.

CHEMICAL engineering; ENGINEERING systems; CHEMICAL systems; ELECTROLYTIC reduction; OXYGEN reduction

Processes, 2020, Vol 8, Issue 11, p1354

2227-9717

Academic Journal

10.3390/pr8111354