Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Rapid Estimation of the Aerodynamic Coefficients of a Missile via Co-Kriging

코크리깅을 활용한 신속한 유도무기 공력계수 추정

  • Kang, Shinseong (Department of Aerospace Engineering, Pusan National University) ;
  • Lee, Kyunghoon (Department of Aerospace Engineering, Pusan National University)
  • Received : 2019.09.02
  • Accepted : 2019.11.19
  • Published : 2020.01.01
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Abstract

Surrogate models have been used for the rapid estimation of six-DOF aerodynamic coefficients in the context of the design and control of a missile. For this end, we may generate highly accurate surrogate models with a multitude of aerodynamic data obtained from wind tunnel tests (WTTs); however, this approach is time-consuming and expensive. Thus, we aim to swiftly predict aerodynamic coefficients via co-Kriging using a few WTT data along with plenty of computational fluid dynamics (CFD) data. To demonstrate the excellence of co-Kriging models based on both WTT and CFD data, we first generated two surrogate models: co-Kriging models with CFD data and Kriging models without the CFD data. Afterwards, we carried out numerical validation and examined predictive trends to compare the two different surrogate models. As a result, we found that the co-Kriging models produced more accurate aerodynamic coefficients than the Kriging models thanks to the assistance of CFD data.

유도무기의 설계 및 제어에서 6자유도 공력계수의 신속한 추정을 위해 공력계수 데이터에 기반한 예측 모형이 주로 이용된다. 고정확도의 공력계수 예측 모형은 다수의 풍동시험 데이터로 생성할 수 있지만, 이는 많은 시간과 자원을 요구한다. 따라서 본 연구에서는 소수의 풍동시험 데이터를 다수의 전산유체역학 데이터와 혼합한 코크리깅 기법을 활용해 고정확도의 공력계수를 신속하고 효율적으로 예측하고자 한다. 풍동시험과 전산유체역학 데이터를 혼용한 예측 모형의 우수성을 보기 위해, 전산유체역학 데이터 보조의 유무에 따라 두 가지 공력계수 예측 모형을 생성한 후 수치적 검증과 예측 경향성 점검으로 두 모형의 예측 정확도를 비교하였다. 그 결과, 전산유체역학 데이터의 도움 덕분에 코크리깅 모형으로 크리깅 모형보다 더 정확한 공력계수 산출이 가능한 것을 확인하였다.

Keywords

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