Adaptive model-based pressure control and method of resin cure

Details Adaptive model-based pressure control and method of resin cure Adaptive model-based pressure control and method of resin cure

1987-07-31

1988-09-20

Smith, Jerry

Boots, shoes, and leggings

425143, 425149, 364148, 364149, 364150, 364153, G06F 1546, G05B 1302

Patent

active

047730218

ABSTRACT:
Composites such as graphite reinforced PMR-15 resin are cured in a heated press by following a temperature schedule and changing from low to high pressure after the start of resin cross linking. A pressure control and method to time application of high pressure uses temperature and dielectric sensor outputs and a semi-empirical model of the resin electrical conductivity. The model estimates the future variation of resin conductivity and determines time-to-go to a maximum in electrical conductivity. A signal to apply high pressure is generated when the estimated time to maximum conductivity falls below a threshold. On-line fitting of the model to sensor data as it is gathered provides a mechanism for adapting the control to the peculiarities of a given batch of resins and a particular cure schedule.

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patent: 4721589 (1988-01-01), Harris
R. W. Lauver, "Kinetics of Imidization and Crosslinking in PMR Polyimide Resin", Jr. of Polymer Science: Polymer Chemistry Ed., 17, 2529-2539 (1979).
L. F. Mallett, "Microprocessor-Based Control of Composite Curing", M. S. Thesis, MIT, Jun. 1985.

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