Identification and linear multivariable control in an absorption‐desorption pilot plant

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Abstract
A study of the identification of the dynamics of a pilot scale absorption‐desorption system and the subsequent design of a multivariable control scheme are reported. A multivariable transfer function model was obtained from experimental input‐output data in which the inputs (steam supply and liquid circulation rate) were perturbed simultaneously using uncorrelated pseudo random sequences. A two‐step, least‐squares estimator was employed for the identification of the model.A multivariable controller was then designed on the basis of the direct Nyquist array method. The implementation of the controller design indicated the utility of the design procedure as compared to independent single input, single output control loops; there is, however, some scope for additional tuning.