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An injection molding study. Part II: Evaluation of alternative control strategies for melt temperature
Author(s) -
Gomes V. G.,
Patterson W. I.,
Kamal M. K.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760261206
Subject(s) - overshoot (microwave communication) , pid controller , settling time , temperature control , control theory (sociology) , materials science , sensitivity (control systems) , molding (decorative) , controller (irrigation) , process (computing) , injection molding machine , work (physics) , step response , control engineering , control (management) , mechanical engineering , computer science , composite material , engineering , mold , telecommunications , agronomy , artificial intelligence , electronic engineering , biology , operating system
Melt temperature is a key variable of the injection molding process. The evaluation of different control strategies for the melt temperature was based on the process dynamics presented in Part I of this work. The controllers tested were: PID (proportional‐integral‐derivative) control of barrel temperatures, direct PID control of melt temperature, Dahlin control, and Smith Predictor control of melt temperature. The controllers were tuned by simulation studies and were evaluated by a comparison of performance indices. The controller responses obtained through experiments were evaluated by comparing the rise time, peak overshoot, damping, settling time, and control effort. Analyses were performed to ascertain the sensitivity characteristics of the controllers.