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Identification of Tandem-Extrusion System's Dynamic Characteristics Based on MATLAB and State Subspace Theory

In view of the complexity of twin screw and melt pump tandem extrusion systems, the identification of the dynamic characteristics of these systems was performed by using MATLAB and state subspace method. Three input one output model was obtained and the controllability and observability of the system was identified by MATLAB. The fitting degree of simulated and actual melt pressure curve increased with increasing the output variables, which indicated that the tandem extrusion system was an interrelated coupled nonlinear system.