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Statistical Effective Interval Determination and Reliability Assessment of Input Variables Under Aleatory Uncertainties

물리적 불확실성을 내재한 입력변수의 확률 통계 기반 유효 범위 결정 방법 및 신뢰성 평가

  • Joo, Minho (School of Mechanical Engineering College, Yonsei Univ.) ;
  • Doh, Jaehyeok (School of Mechanical Engineering College, Yonsei Univ.) ;
  • Choi, Sukyo (Research & development division, Hyndai Motor) ;
  • Lee, Jongsoo (School of Mechanical Engineering College, Yonsei Univ.)
  • Received : 2017.03.23
  • Accepted : 2017.08.29
  • Published : 2017.11.01

Abstract

Data points obtained by conducting repetitive experiments under identical environmental conditions are, theoretically, required to correspond. However, experimental data often display variations due to generated errors or noise resulting from various factors and inherent uncertainties. In this study, an algorithm aiming to determine valid bounds of input variables, representing uncertainties, was developed using probabilistic and statistical methods. Furthermore, a reliability assessment was performed to verify and validate applications of this algorithm using bolt-fastening friction coefficient data in a sample application.

동일한 시험조건에서 반복시험으로부터 얻어진 실험 데이터는 이론적으로 동일한 값을 가져야 한다. 그러나 실제 데이터 결과는 다양한 환경 요소들에 의해 발생하는 오차와 불확실성을 가지게 되어 시험 값이 변동량을 가진다. 이는 정확한 실험 데이터를 얻는데 제한사항이 된다. 본 연구에서는 확률통계 방법을 이용하여 불확실성을 가진 입력변수의 유효범위를 결정하는 알고리즘을 제안하였다. 또한 실제 현장에서 사용되는 볼트 체결 마찰계수 데이터를 이용하여 제안된 알고리즘을 적용하여 불확실성을 내재한 입력변수의 유효범위를 산출하고 이에 대한 신뢰성 평가를 하였다.

Keywords

References

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