Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
권호 표지
DOI QR코드

DOI QR Code

Structural Safety Evaluation for the Hydraulic Power Unit of Topside Module According to the Movement of Offshore Plant

해양구조물 움직임에 따른 Topside Module의 HPU에 대한 구조안전성 평가

  • Ryu, Bo-Rim (Department of Marine System Engineering, Korea Maritime & Ocean University) ;
  • Lee, Jin-Uk (Department of Ship Operation, Korea Maritime & Ocean University) ;
  • Kang, Ho-Keun (Division of Marine System Engineering, Korea Maritime & Ocean University)
  • 류보림 (한국해양대학교 대학원) ;
  • 이진욱 (한국해양대학교 선박운항과) ;
  • 강호근 (한국해양대학교 기관시스템공학부)
  • Received : 2020.08.03
  • Accepted : 2020.10.28
  • Published : 2020.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

The design of offshore plants should reflect the various requirements of the owner and the classification society. For a topside module mounted on an of shore structure, the design process is very demanding because of the large spatial constraints and the many requirements related to marine environmental conditions and safety such as the movement of the structure. In this study, the load acting on the hydraulic power unit, which is one of the main equipment in the topside module, was calculated according to the DNVGL rule; the structural safety was evaluated according to each load condition and the structural reliability of the developed product was improved. For structural analysis, MSC software was used, and structural analysis was performed under five load conditions to review structural safety for various movements. The results show that the maximum stress occurred during pitching toward the stern (Load Case 5). The stress level was approximately 85 % of the allowable stress, and the maximum deformation was approximately 5 % of the allowable value. The structural safety was confirmed, and no intermember interference occurred.

해양플랜트는 발주처와 선급에서 요구하는 다양한 항목들을 설계할 시에 반영하여야 한다. 특히, 해양구조물에 탑재되는 Topside Module의 경우 육상플랜트와는 다르게 공간적 제약이 크고 구조물의 움직임과 같은 해상 환경조건 및 안전과 관련된 요구사항들이 많아 그 설계 과정이 매우 까다롭다. 본 연구에서는 Topside Module에 들어가는 주요장비 중 하나인 HPU(Hydraulic Power Unit) 구조물에 작용하는 하중을 DNVGL 규칙에 따라 계산하고, 각 하중조건에 따른 구조안전성 평가를 진행하였고 개발된 제품의 구조 신뢰성을 향상하고자 하였다. 구조해석은 범용프로그램인 MSC 소프트웨어를 사용하였고, 총 5가지 하중 조건으로 구조해석을 진행하여 다양한 움직임에 대한 안전성을 검토하였다. 그 결과 선미 방향 Pitching 상태(Load Case 5)에서 최대 응력이 발생하였고, 응력 수준은 허용응력의 약 85 % 수준이고, 최대변위는 허용치의 약 5 % 수준으로 구조안전성이 확인되었으며 부재 간 간섭은 발생하지 않았다.

Keywords

References

  1. DNV(2016), Hull Structural Design - Ships with Length 100 Metres and Above
  2. El-Reedy, M. A.(2012), Offshore Structures: Design, Construction and Maintenance, Gulf Professional Publishing, pp. 23-90.
  3. Kim, S. C., S. H. Kang, J. H. Choi, J. H. Kim, and Y. C. Park(2016), Structural Safety Evaluation for Fixed CO2 Extinguishing Systems Under Ship Motion, Transactions of the KSME C Industrial Technology and Innovation, Vol. 4, No. 2, pp. 75-83. https://doi.org/10.3795/KSME-C.2016.4.2.075
  4. Ko, D. E. and B. S. Jang(2017), Ship and Offshore Structural Mechanics, TEXTBOOKS, pp. 25-29.
  5. Ma, J., D. Zhou, Z. Han, K. Zhang, Y. Bao, and L. Dong(2019), Fluctuating wind and wave simulations and its application in structural analysis of a semi-submersible offshore platform, International Journal of Naval Architecture and Ocean Engineering, Vol. 11, pp. 624-637. https://doi.org/10.1016/j.ijnaoe.2018.11.001
  6. MSC software(2013), MSC. PATRAN Preference Guide Volume 1: Structural Analysis, MSC software.
  7. MSC software(2019), MSC. NASTRAN Operation Guide, MSC software.
  8. Oh, J. W., C. H. Min, S. G. Cho, D. S. Bae, and H. W. Kim(2016), Concept of an advanced simulation-based design for engineering support of offshore plant equipment industries and its realization method, Ocean Engineering, Vol. 121, pp. 369-381. https://doi.org/10.1016/j.oceaneng.2016.05.028
  9. Song, C. Y., H. Y. Choi, and S. H. Shim(2013), Structural Safety Evaluation of Marine Loading Arm Using Finite Element Analysis, Journal of Ocean Engineering and Technology, Vol. 27, No. 1, pp. 43-50. https://doi.org/10.5574/KSOE.2013.27.1.043
  10. von Mises, R.(1913), Mechanik der festen Körper im plastisch deformablen Zustand, Nachrichten von der Gesellschaft der Wissenschaften zu Göttingen, Mathematisch-Physikalische Klasse, Vol. 1913, pp. 582-592.
  11. Yoon, S. K, J. H. Kim, and Y. J. Kim(2018), Optimal Design of Explosion-Proofed Actuator-Motor Assembly, The KSFM Journal of Fluid Machinery, Vol. 21, No. 4, pp. 17-23 https://doi.org/10.5293/kfma.2018.21.4.017