Delay-compensated controllers for two-input/two-output (TITO) multivariable processes

A decentralized controller design based on the direct synthesis method for two-input/two-output (TITO) processes in the Smith predictor configuration is proposed. The decentralized controllers are designed individually on the basis of the diagonal individual transfer functions of the process. Using the direct synthesis principle, the two decentralized controllers are designed using the individual diagonal transfer functions of the process matrix and the individual desired diagonal closed-loop transfer functions. Further, these direct synthesis controllers are implemented in the Smith predictor configuration for each output. While converting from the synthesis controller to the Smith predictor configuration, the decentralized controller parameters are directly obtained in terms of the individual closed-loop desired tuning parameters. The method is compared with the recently reported methods. (c) 2007 Curtin University of Technology and John Wiley & Sons, Ltd.