| Summary: | 碩士 === 東海大學 === 化學工程學系 === 87 === A monitoring procedure incorporating the Fourier transform technique using pulse testing to identify the maximum closed-loop log modulus (Lc,max) is presented in this study. Under an operation of closedloop control, a single pulse test in the set-point is introduced to the system. The closed-loop transients can be numerically translated into frequency response data by Fourier integral transforms, and the Lc,max can easily be calculated using these data. The parameters of a given process model can also be obtained by a least-squares fit in frequency domain using theses data. This technique has also extended to identified a n×n MIMO system using n pulse tests. Simulation results have demonstrated that the proposed technique can yield a reliable Lc,max and be more easily implemented than those available methods in the literature. Furthermore, process identification using the Fourier transforms and optimal PID controller tuning for an open-loop unstable exothermic chemical reactor was also investigated in this study.
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