Masters Theses

Date of Award

8-1988

Degree Type

Thesis

Degree Name

Master of Science

Major

Chemical Engineering

Major Professor

Duane D. Bruns

Committee Members

John F. Fellers, Donald C. Bogue

Abstract

A Control and Data Acquisition (CADA) Development System has been de veloped and demonstrated on an extruder and spinline in the Materials Science and Engineering Department's Spinning Laboratory. The capabilities provided by the CADA Development System and on-line measurements establish a highly functional real-time multi-user research facility. The system will allow the building of a data base to study topics ranging from simple process modeling to research into the effect of operating conditions on some fiber properties, process optimization, and application of advanced multivariable control strategies.

The CADA System is built around a Texas Instruments TI-530-1104 Indus trial Programmable Controller Development System. It involves four separate computers. The TI-530 contains a processor which organizes the Input/Output tasks and communication between the various computers. Two separate Basic Language Modules which run asynchronously interfaced with the TI-530. Presently one is used for control algorithms while the other could be interfaced to computer interactive sensors or used for on-line real-time calculations. A Video Programming Unit 200-3104 interfaces to the TI-530 and Basic Modules to serve as their programming station. A Control Vision Unit-5000 which is an industrially hardened TI Professional Computer connects to the TI-530 programmable controller to provide an operator interface for controller operation and for data handling and storage.

The motivation for developing the CADA installation for the extruder and spinline unit operations was to expand the application of advanced control strategies to polymer processing. Implementation of process control method ologies to polymer processing has lagged behind most chemical engineering unit operations. This type of research is now being started.

Utilization of the CADA System has been demonstrated by carrying out several step tests on the extruder and spinline. Steps tests were made in take-up motor speed, screw speed, gear pump motor speed, and die inlet melt tempera ture set point. For each step test the fiber diameter and die inlet melt pressure responses were collected. The response data from these tests are presented.

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