Design Optimization of a Deep-sea Pressure Vessel by Reliability Analysis

신뢰성 해석을 이용한 심해용 내압용기의 설계 최적화

  • JOUNG TAE-HWAN (Dept. of Naval Architecture and Ocean Engineering, Chungnam National University) ;
  • NHO IN-SIK (Dept. of Naval Architecture and Ocean Engineering, Chungnam National University) ;
  • LEE JAE-HWAN (Dept. of Naval Architecture and Ocean Engineering, Chungnam National University) ;
  • HAN SEUNG-HO (Korea Institute of Machinery and Materials)
  • 정태환 (충남대학교 선박해양공학과) ;
  • 노인식 (충남대학교 선박해양공학과) ;
  • 이재환 (충남대학교 선박해양공학과) ;
  • 한승호 (한국기계연구원 구조연구부 구조안전그룹)
  • Published : 2005.04.01

Abstract

In order to consider the statistical properties of probability variables which are used in structural analysis, the conventional approach of using safety factors based on past experience, are usually used to estimate the safety of a structure. The real structures could only be analyzed with the error in estimation of loads, materials and dimensional characteristics. Errors should be considered systematically in the structural analysis. In this paper, we estimated the probability of failure of two pressure vessels, simultaneously, using computational analysis. One pressure vessel, theoretically, had no stiffener whereas the other had. This paper also discusses sensitivity values of random variables in the rounded parts of the pressure vessel which had ring-style stiffener in the center of the external area which had ring-style stiffener. Finally, we show that the reliability index, and the probability of failure, can be calculated to particular tolerance limits.

Keywords

References

  1. 김요숙, 신영수, 이화미 (2000). '철근콘크리트 전단벽의 수정된 AFOSM 해석에 관한 연구', 대한건축학회 논문집, 제2호, pp 11-17
  2. 노인식, 정태환, 천일용 (2001). 심해 무인잠수정의 내압장치 구조해석 - III, 한국해양연구원 보고서, pp 70-93
  3. 박석재,최외호, 김요숙, 신영수 (2001). '한계상태방정식에 따른 평면응력요소의 신뢰성 해석' 한국강구조학회논문집, 제13 권, 제5호, pp 567-575
  4. 양영순, 서용석, 이재옥 (1999). 구조 신뢰성 공학, 서울대학교 출판부, pp 53-55, pp 141-145
  5. 이재환, 정태환,허유정, 이판묵 (2002). '심해용 무인잠수정의 내압용기 구조설계', 대한조선학회 추계학술대회 논문집, pp 380-384
  6. 정태환, 노인식, 이재환, 이판묵 (2003). '외압을 받는 내압용기의 보강 원통형 쉘 및 국부구조설계' 대한조선학회 춘계학술대회 논문집, pp 610-615
  7. (주)태성에스엔이 FEA사업부 (2002). 'ANSYS 사용자를 위한 예제 모음집', (주)태성에스엔이, pp 277-291
  8. Hasofer A.M and Lind L.C. (1974). 'Exact and Invariant Second Moment Code Format', Journal of the Engineering Mechanics Division, ASCE, Vol 100, pp 111-121
  9. Shooman, M.L. (1968), Probabilistic Reliability An Engineering Approach, McCraw Hill, New York
  10. Bucher, C.G. and Bourgund, U. (1990), 'A Fast and Efficient Response Surface Approach for Structural Reliability Problem', Structural Safety, Vol 7, pp 57-66 https://doi.org/10.1016/0167-4730(90)90012-E