A closed-loop system identification toolbox for Matlab is presented, including a user-friendly graphical user interface, that communicates with MathWork's System Identification Toolbox (SITB), version 4.0. With the CLOSID toolbox it is possible to identify linear (parametric) models on the basis of experimental data obtained from a plant that is operating under the presence of a controller. The toolbox is designed partially as a shell around the SITB, and has been given a similar setup. It comprises several closed-loop identification methods (both classical and more recent ones), and includes tools for evaluation of closed-loop model properties
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