Studies on the Identification and Control of Multi-rate Systems

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Multirate systems are very common in the chemical process industry. This is so because many property or quality variables that one wants to regulate are not available at as fast a sample rate as one desires. Typically, the primary measurements such as the composition, density or molecular weight distribution measurements take several minutes or even more than one hour of analysis time. On the other hand secondary measurements such as flow-rates, temperatures and pressures are sampled at relatively fast rate, and usually the manipulative variables can be adjusted at relatively fast sample rates, the only limitation being the slow sampling of the primary variables. This research was concerned with the analysis and design of such multirate systems, where the outputs or the variables to be regulated are only available at regular but slow sample rates and secondary variables can be measured as fast as the manipulative variables; in particular, the following topics were studied.(1) Adaptive control system design for multirate systems(2) Design of a model output following control system for multirate systems(3) A novel ripple free multirate control system design(4) Application of the proposed method to mechanical servo systemsand we also examined identification of chemical multirate processes and applicability of the proposed method to process such as CSTR with international collaborative researchers.