Integrated Switching and Feedback Control for Mold Filling in Resin Transfer Molding

[+] Author and Article Information
Prabir Barooah, Berna Berker, J. Q. Sun

Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

J. Manuf. Sci. Eng 123(2), 240-247 (Apr 01, 2000) (8 pages) doi:10.1115/1.1348256 History: Received June 01, 1999; Revised April 01, 2000
Copyright © 2001 by ASME
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Mold A: (A) channels and placement of control elements, (B) mold filling with SLC for no racetracking, (C) mold filling for racetracking
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Uncontrolled flow front
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The flow front under the optimal feedback control
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The system transfer function coefficients as a function of time. Top: the coefficients of G1, Bottom: the coefficients of G2.
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The optimal injection pressures of the controller. u1: pressure at G1,u2: pressure at G2.
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The tracking error ‖sk−sk,ref‖ as a function of time
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The block diagram of the integrated switching and feedback control
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Top: the sub-domains of mold A. Bottom: location of control elements and lineal sensors in mold A.
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Flow chart of the integrated control logic for mold filling in mold A
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The flow front contours for controlled mold filling simulation in mold A with the integrated switching and feedback control
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The time history of the control for mold A by the integrated controller. The first plot shows the pressures at gates G1,G2 and G3. The second plot shows the operation of the vents. The third plot shows the pressures at the three vent-to-gate converters regulated by the feedback control. A negative pressure indicates that a converter is kept open as a vent. A zero pressure indicates that the injection gate of the converter is closed.
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The real-time estimated system coefficients when the feedback control loop was active. Since Ck is diagonal, only the three diagonal terms are shown.
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The tracking error of the feedback control in channels 1 to 3
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The error in predicting the flow front with the proposed system model
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The numbered edges of mold A



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