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A Novel Method to Improve Temperature Uniformity in Polymer Composites Microwave Curing Process through Deep Learning with Historical Data

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Abstract

Compared with processing methods using conductive heating, microwave processing technology has many advantages such as its extremely short processing time and low energy consumption. However, the uneven temperature on the composite surface resulted from the uneven electromagnetic field distribution have become a big problem. Because the traditional model-based approach was difficult to establish the relationship between the composite temperature behaviors and microwave control strategies, existing methods mainly alleviated this problem by generating a relative movement between the microwave field and the object being heated, which cannot essentially achieve a uniform temperature distribution due to the uncertainty of the random compensation principle. In this paper, a data-driven method was proposed to solve this problem using an optimized convolutional neural network with extensive historical data. On this basis, the monitored uneven temperature distribution on the composite surface was accurately compensated in real time. Experimental results indicated that a reduction of ~53% in temperature difference was achieved compared with existing methods.

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Abbreviations

MCS :

microwave control strategy

HP :

heating pattern

X :

heating rate/temperature

X :

relative heating rate/temperature

Ave :

average value of the component

Max :

maximum value of the component

δ :

standardization coefficient

E :

loss

p :

batch size

δ ij :

component of the label MCS

\( {\hat{\delta}}_{ij} \) :

component of the MCS predicted by the CNN model

w new :

weight after update

w old :

weight before update

Δw(q):

update value

η :

learning rate

α :

tuning factor

Average error rate:

prediction error rate of the CNN model on the test set

Accuracy :

prediction accuracy of the CNN model on the test set

N :

sample size of the test set

l :

number of magnetrons

ΔTmax :

preset temperature threshold

r1, r2 :

acceleration coefficient

NC1, NC2, NC3 :

number of filters in the 3 convolutional layers

Nh1, Nh2 :

number of filters in the 2 hidden layers

\( {\mathbf{P}}_i^k \) :

position of the i-th particle on the k-th step

\( {\mathbf{V}}_i^k \) :

velocity of the i-th particle on the k-th step.

\( {\mathbf{P}}_{i, Best}^k \) :

best position recorded by the i-th particle on the k-th step

\( {\mathbf{P}}_{Best}^k \) :

best position of the particle swarm on the k-th step

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Acknowledgements

This project was supported by National Natural Science Foundation of China (Grant no. 51875288 and no. 51575275), jointly supported by Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0282). The authors sincerely appreciate the continuous support provided by our industrial collaborators.

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Correspondence to Yingguang Li.

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Li, D., Li, Y., Zhou, J. et al. A Novel Method to Improve Temperature Uniformity in Polymer Composites Microwave Curing Process through Deep Learning with Historical Data. Appl Compos Mater 27, 1–17 (2020). https://doi.org/10.1007/s10443-019-09791-5

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  • DOI: https://doi.org/10.1007/s10443-019-09791-5

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