3D-Surface-Model for Injection Speed Process
November 8, 2012
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Ma’moun A. Abu-Ayyad.
Injection velocity control in plastic injection molding is challenging as this process is inherently nonlinear, requiring an adaptive control strategy for good tracking of complex velocity trajectories. In this paper, a surface based model approach is developed tracking complex trajectories of injection velocity. This technique employs a 3-dimensional (3D) nonlinear surface model of the controlled variable (injection velocity) in the overall control architecture to calculate the manipulated variable or control action to a hydraulic servovalve. The strategy uses the controlled and manipulated variables as inputs to the 3D surface to update the nonlinear plant and controller parameters while the closed-loop control is executed, thereby handling the nonlinear characteristics of the plant being controlled.
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