Intelligent composite processing using variable frequency method: preliminary results

Yunchang Qiu, Valerie Adegbite, Martin Hawley

Research output: Chapter in Book/Report/Conference proceedingChapter

  • 3 Citations

Abstract

An innovative variable frequency microwave processing (VFMP) method is demonstrated in this paper. An oscillator, a RF plug-in and a Travelling Wave Tube (TWT) were used to compose the variable frequency power source of the system. The output frequency ranges from 1.7 GHz to 4.3 GHz. This particular system makes use of a single mode tunable microwave cavity as an applicator. To study its electromagnetic behavior, the cavity was characterized in the frequency range of the power source. Experimental data are consistent with theoretical prediction. Placed in the fixed volume cavity, graphite/epoxy prepreg (Hercules AS4/3501-6) laminates were heated at different frequencies where empirical modes exist. These modes have a variety of heating patterns and heating rates. Some of them are complementary to each other. Four empirical modes were selected to do heating experiments using mode sweeping method, in which one mode was excited at a time in the programmable heating cycles. By selectively assigning the heating time for each mode, a very uniform heating was achieved. The temperature gradients were less than 5 °C at a temperature of 85 °C. In aid of the implementation of appropriate control algorithm, this method can provide fast, efficient and uniform microwave heating.

LanguageEnglish (US)
Title of host publicationInternational SAMPE Technical Conference
PublisherSAMPE
Pages173-183
Number of pages11
Volume27
StatePublished - 1995
EventProceedings of the 1995 27th International SAMPE Technical Conference - Albuquerque, NM, USA
Duration: Oct 9 1995Oct 12 1995

Other

OtherProceedings of the 1995 27th International SAMPE Technical Conference
CityAlbuquerque, NM, USA
Period10/9/9510/12/95

Profile

Heating
Composite materials
Processing
Traveling wave tubes
Applicators
Microwave heating
Graphite
Microwave frequencies
Heating rate
Thermal gradients
Laminates
Microwaves
Experiments
Temperature

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemical Engineering (miscellaneous)
  • Building and Construction
  • Polymers and Plastics

Cite this

Qiu, Y., Adegbite, V., & Hawley, M. (1995). Intelligent composite processing using variable frequency method: preliminary results. In International SAMPE Technical Conference (Vol. 27, pp. 173-183). SAMPE.

Intelligent composite processing using variable frequency method : preliminary results. / Qiu, Yunchang; Adegbite, Valerie; Hawley, Martin.

International SAMPE Technical Conference. Vol. 27 SAMPE, 1995. p. 173-183.

Research output: Chapter in Book/Report/Conference proceedingChapter

Qiu, Y, Adegbite, V & Hawley, M 1995, Intelligent composite processing using variable frequency method: preliminary results. in International SAMPE Technical Conference. vol. 27, SAMPE, pp. 173-183, Proceedings of the 1995 27th International SAMPE Technical Conference, Albuquerque, NM, USA, 10/9/95.
Qiu Y, Adegbite V, Hawley M. Intelligent composite processing using variable frequency method: preliminary results. In International SAMPE Technical Conference. Vol. 27. SAMPE. 1995. p. 173-183.
Qiu, Yunchang ; Adegbite, Valerie ; Hawley, Martin. / Intelligent composite processing using variable frequency method : preliminary results. International SAMPE Technical Conference. Vol. 27 SAMPE, 1995. pp. 173-183
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