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Evaluation of simple dynamic models and controllers for hydraulic and nozzle pressure in injection molding
Author(s) -
Fara Dib Abu,
Kamal M. R.,
Patterson W. I.
Publication year - 1985
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.760251109
Subject(s) - nozzle , pid controller , control theory (sociology) , controller (irrigation) , dynamic simulation , step response , materials science , proportional control , computer science , control engineering , control system , simulation , mechanical engineering , engineering , temperature control , control (management) , agronomy , artificial intelligence , biology , electrical engineering
Simple pseudo‐steady state relations between the hydraulic and nozzle pressures of an injection molding machine were presented and verified experimentally. A simulation study was performed to evaluate the performance of simple controllers using dynamic models developed for the hydraulic and nozzle pressures. The controllers chosen were the discrete proportional, proportional‐integral (PI), and proportional‐integral‐derivative (PID) types, tuned according to the ITAE criterion. The control of hydraulic pressure simulation showed that the PI controller had the best overall performance, whereas the result of nozzle pressure control loop simulation showed that the PID controller performance was better than that of the PI controller. All the controllers, in both loops, gave responses that were about an order of magnitude more rapid than the open loop response.