A detailed study was carried out to understand the dynamics of pressure variations at different points in the injection‐molding system. Thus, hydraulic, nozzle, and cavity pressures were evaluated, in addition to the pressure gradient in the cavity. Both steps and pseudorandom binary sequences (PRBS) were employed to obtain and compare dynamic models describing these variables. Subsequently, these models were employed to evaluate and select optimal controllers for the different variables.
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Kamal et al. (1987) studied this question.
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