Control Strategies for Cyclic Polymer Processes
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P. Ralston
Abstract
This paper presents the simulation of a typical cyclic polymer processing operation with respect to the performance of different control strategies for part quality when subjected to disturbances with realistic load-profiles. Disturbances enter the simulation in a complex, probabilistic manner creating a unique flexibility in load representation which helps the simulation more accurately capture the performance of real processing operations. Realistic simulations can provide necessary information and be less costly than benchmark studies on actual processes. The objective of the research is to examine the effect of different control strategies on the overall control of part-to-part quality, not the control of the continuous processes that occur in part fabrication. The performance of six different control strategies is compared; two strategies are conventional feedback, and four strategies are statistically based. The statistically based algorithms effect closed loop control, but only when a true load exists. Results are analyzed using statistical analysis of variance (ANOVA) via a completely randomized block experimental design, and Duncan's multiple range test is used to rank the control strategies. The results indicate that as more disturbances enter the system, the conventional controllers perform better than the other strategies. When fewer disturbances are present, however, the statistically based controllers perform better. The most notable result is that one statistically based controller, the Western Electric runs rules controller, performs well over the entire range of disturbances.
© 1993, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Internal Mixers
- Flow and Heat Transfer Simulation of the Mixing of Polymer Blends Using the Boundary Element Method
- Twin Screw Extrusion, Reactive Processing
- Heat Transfer in Single and Twin Screw Extruders
- Reactive Extrusion of Styrene Polymers
- RIM-pultruded Prepreg for the Injection Molding of Long-fiber Epoxy Composites
- Die Extrusion
- Flow Simulation of a Polymer Melt in a Roller Die
- Potential Applications for Computer-aided Extruder Design
- Molding
- The Gas-assisted Injection Molding Process
- Control Strategies for Cyclic Polymer Processes
- Real-time Neutron Radiography of Injection Mold Filling
- The Role of Process Parameters in Blow Molding and Correlation of 3-D Finite Element Analysis with Experiment
Articles in the same Issue
- Contents
- Contents
- Internal Mixers
- Flow and Heat Transfer Simulation of the Mixing of Polymer Blends Using the Boundary Element Method
- Twin Screw Extrusion, Reactive Processing
- Heat Transfer in Single and Twin Screw Extruders
- Reactive Extrusion of Styrene Polymers
- RIM-pultruded Prepreg for the Injection Molding of Long-fiber Epoxy Composites
- Die Extrusion
- Flow Simulation of a Polymer Melt in a Roller Die
- Potential Applications for Computer-aided Extruder Design
- Molding
- The Gas-assisted Injection Molding Process
- Control Strategies for Cyclic Polymer Processes
- Real-time Neutron Radiography of Injection Mold Filling
- The Role of Process Parameters in Blow Molding and Correlation of 3-D Finite Element Analysis with Experiment
