Abstract
A nonlinear multivariable bioreactor system has been the subject of two differential geometry feedback control design approaches. Exact linearization and input/output linearization are applied to the bioreactor model and verified by simulation experiments. Exact linearization via state feedback shows a high degree of coupling on the controlled variables and large changes on the manipulated variables. Input/output linearization, with the ability of implementing independent, decoupled control loops, gives more satisfactory results. The issues of invertabiity and parameter uncertainties are also discussed in this paper.
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