DOI QR코드

DOI QR Code

다분야 통합해석 시스템의 효율적인 신뢰성 해석기법 연구

An Efficient Approach on Reliability Analysis under Multidisciplinary Analysis Systems

  • 안중기 (한국과학기술원 항공우주공학과) ;
  • 권장혁 (한국과학기술원 항공우주공학과)
  • 발행 : 2005.03.01

초록

다분야 통합해석 시스템의 신뢰성 해석에 대한 기존의 연구들은 대부분 비선형 최적화 기법을 기반으로 하고 있다. 이들은 다분야 통합최적설계 프레임워크를 이용하여 신뢰성을 직접 해석하기 때문에 효율적인 AFORM기법을 적용하는 것이 불가능하다. 본 논문은 AFORM기법을 적용한 다분야 통합시스템의 순차적 신뢰성 해석기법(SARAM)을 제안한다. 이를 위해 신뢰성 해석과 다분야 통합시스템의 해석(MDA)을 분리하고, 순차적으로 배열하여, 되풀이구조를 가지는 해석구조를 구성하였다. 제안된 방법의 효율성은 계산량, 정확도, 그리고 동시 수행기능의 관점에서 평가하였다. 3개의 다분야 통합시스템 예제를 계산한 결과, 제안된 기법은 정확도를 보장하면서 기존의 방법에 비해 우수한 계산효율을 보였다.

Existing methods have performed the reliability analysis using nonlinear optimization techniques. This is mainly due to the fact that they directly apply Multidisciplinary Design Optimization(MDO) frameworks to the reliability analysis formulation. Accordingly, the reliability analysis and the Multidisciplinary Analysis(MDA) are tightly coupled in a single optimizer, which hampers utilizing the recursive and function-approximation based reliability analysis methods such as the Advanced First Order Reliability Method(AFORM). In order to utilize the efficient reliability analysis method under multidisciplinary analysis systems, we propose a new strategy named Sequential Approach on Reliability Analysis under Multidisciplinary analysis systems(SARAM). In this approach, the reliability analysis and the MDA are decomposed and arranged in a sequential manner, making a recursive loop. The efficiency of the SARAM method was verified using three illustrative examples taken from the literatures. Compared with existing methods, it showed the least number of subsystem analyses over other methods while maintaining accuracy.

키워드

참고문헌

  1. Gu, X., Renaud, JE, and Batill, SM, 'An Investigation of Multidisciplinary Design Subject to Uncertainty', AIAA-98-4747, 1998
  2. Gu, X. and Renaud, J.E. 'Implementation Study of Implicit Uncertainty Propagation(IUP) in Decomposition-Based Optimization' AIAA-2002- 5416, 2002
  3. Du, X. and Chen, W., 'Efficient Uncertainty Analysis Methods for Multidisciplinary Robust Design', AIAA Journal, Vol. 40(3), 2002, pp.545-552 https://doi.org/10.2514/2.1681
  4. Du, X. and Chen, W., 'Collaborative Reliability Analysis for Multidisciplinary Systems Design', AIAA-2002-5474, 2002
  5. Alexandrov, N. M. and Lewis., R. M, 'Algorithm Perspectives on Problem Formulation in MDO', AIAA-2000-4719, 2000
  6. Rackwitz, R. and Fiessler, B., 'Structural Reliability under combined Random Load Sequences', Computers and Structures, Vol.9, 1978, pp.489-494 https://doi.org/10.1016/0045-7949(78)90046-9
  7. Sobieszczanski-Sobieski, J., 'Sensitivity Analysis and Multidisciplinary Optimization for Aircraft Design: Recent Advances and Results', Journal of Aircraft, Vol. 27(12), 1990, pp. 993-1001 https://doi.org/10.2514/3.45973
  8. Hasofer, A.M. and Lind, N.C.,'Exact and Invariant Second-moment Code Format', Journal of Engineering Mechanics, Vol. 100(1), 1974, pp. 111-121
  9. MDO test suite, NASA MDOB web, http://mdob.Iarc.nasa.gov/
  10. Sobieszczanski-Sobieski, J. et.al, 'Bi-Level Integrated System Synthesis(BLISS)', NASA/ TM-1998-208715, 1998