기계학습을 이용한 유동가속부식 모델링: 랜덤 포레스트와 비선형 회귀분석과의 비교

이경근; 이은희; 김성우; 김경모; 김동진

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자료유형: 학술저널

저자정보: 이경근 이은희 김성우 김경모 김동진

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제18권 제2호

발행연도: 2019.1

수록면: 61 - 71 (11page)

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연구주제

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연구배경

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연구방법

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연구결과

초록· 키워드

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Flow-Accelerated Corrosion (FAC) is a phenomenon in which a protective coating on a metal surfaceis dissolved by a flow of fluid in a metal pipe, leading to continuous wall-thinning. Recently, manycountries have developed computer codes to manage FAC in power plants, and the FAC predictionmodel in these computer codes plays an important role in predictive performance. Herein, the FACprediction model was developed by applying a machine learning method and the conventional nonlinearregression method. The random forest, a widely used machine learning technique in predictive modelingled to easy calculation of FAC tendency for five input variables: flow rate, temperature, pH, Cr content,and dissolved oxygen concentration. However, the model showed significant errors in some inputconditions, and it was difficult to obtain proper regression results without using additional data points. In contrast, nonlinear regression analysis predicted robust estimation even with relatively insufficientdata by assuming an empirical equation and the model showed better predictive power when the interactionbetween DO and pH was considered. The comparative analysis of this study is believed to provideimportant insights for developing a more sophisticated FAC prediction model.

참고문헌 (15)

참고문헌 신청

B. Chexal / 1998 / Flow-Accelerated Corrosion

I. S. Woosey / 1990 / Assessment and avoidance of erosion-corrosion damage in PWR feedpipework :60~65

G. J. Bignold / 1981 / Erosion-corrosion in nuclear steam generators / Water Chemistry of Nuclear Reactor Systems :5~18

J. Ducreux / 1982 / Theoretical and Experimental Investigation of the Effect of Chemical Composition of Steels on their Erosion-Corrosion Resistance / Specialists Meeting on Erosion-Corrosion of Steels in High Temperature Water and Wet Steam

1997 / EPRI TR-103198-P1, CHECWORKS Computer Program Users Guide / EPRI

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