Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Prediction of Process-Induced Spring-Back of CFRP Composite Structure Using Deep Neural Network

심층신경망을 이용한 CFRP 복합재 구조의 공정 유도 스프링백 예측

  • Yuseon Lee (School of ICT, Robotics & Mechanical Engineering, Hankyong National University) ;
  • Dong-Hyeop Kim (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Sang-Woo Kim (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Soo-Yong Lee (Research Institute of Aerospace Engineering and Technology, Korea Aerospace University)
  • 이유선 (한경국립대학교 ICT로봇기계공학부) ;
  • 김동협 (한국항공대학교 항공우주 및 기계공학과) ;
  • 김상우 (한국항공대학교 항공우주 및 기계공학과) ;
  • 이수용 (한국항공대학교 항공우주산업기술연구소)
  • Received : 2024.08.02
  • Accepted : 2024.08.22
  • Published : 2024.10.31
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Abstract

A deep neural network (DNN) was employed to predict the spring-back of a CFRP composite spar induced by the curing process. A total of 816 spring-back data points, derived from varying stacking angles, layer counts, and flange radii, were generated through finite element method (FEM)-based curing analysis to train the DNN model. The trained model demonstrated an R-squared value of 0.99 and a mean squared error of 0.00093, indicating excellent performance. For untrained flange radii, the spring-back predicted by the DNN exhibited a mean relative error of 2.18% when compared to FEM results. Additionally, while FEM analysis required approximately 20 minutes, the DNN-based prediction required only about 14 milliseconds. These results highlight the potential of using DNNs for the rapid prediction of process-induced deformation in CFRP composites.

본 연구에서는 심층신경망을 활용하여 CFRP 복합재 스파의 경화 공정에 의한 스프링백을 예측하였다. 유한요소법 기반 경화 해석을 통해 적층 각, 적층 수, 플랜지 반경에 따른 총 816 개의 스프링백 데이터를 생성하여 심층신경망 모델을 학습시켰다. 학습된 모델의 R-squared 값은 0.99, 평균제곱오차는 0.00093으로 산출되어 모델 성능이 우수함을 확인하였다. 학습되지 않은 플랜지 반경에 대한 스프링백 예측 결과, 유한요소해석 결과와 비교하여 평균 상대오차는 2.18%로 나타났다. 또한, 유한요소해석은 약 20 min이 소요된 반면, 심층신경망을 통한 예측 시간은 약 14 ms에 불과하였다. 이를 통해 CFRP 복합재의 공정 유도 변형을 빠르게 예측하기 위한 심층신경망의 활용 가능성을 확인하였다.

Keywords

Acknowledgement

본 연구는 2024년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No.2022R1A6A1A03056784). 또한 본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 RS-2024-00444205).

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