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A number of tuning rules have been reported in literature for unstable first order plus time delay processes. However, at least to the author knowledge most of the reported methods fail to give robust performance for process models with time delay equal to or greater than the process time constant. In this work, a robust tuning method based on the modified Smith predictor is proposed for unstable...
In this work, a recently reported two degree of freedom control structure namely the Parallel Control Structure (PCS) is modified to achieve improved control performance for unstable processes. New tuning rules are proposed using a direct synthesis approach for unstable first order plus time delay (UFOPTD), unstable second order plus time delay (USOPTD) and integrating and unstable plus time delay...
A set of new tuning rules for fractional-order controllers for integrating and unstable processes are proposed in this study. The tuning rules are proposed in order to minimize the IST2E performance criterion. Furthermore, analytical expressions are devised for the optimal values of the performance indexes. The performance indexes may be used to assess the controller performance for a given process...
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