Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Propulsion Shafting Alignment Analysis Considering the Interaction between Shaft Deflection and Oil Film Pressure of Sterntube Journal Bearing

축 처짐과 선미관 저널 베어링 유막 압력의 상호작용을 고려한 추진축계 정렬 해석

  • Cho, Dae-Seung (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Jang, Heung-Kyu (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Jin, Byung-Mu (Hull Basic & Structure Design Part, DSEC Co. Ltd.) ;
  • Kim, Kookhyun (Dept. of Naval Architecture and Ocean Engineering, Tongmyong University) ;
  • Kim, Sung-Chan (Dept. of Ship and Ocean System, Inha Technical College) ;
  • Kim, Jin-Hyeong (Research & Development Center, Createch Co. Ltd.)
  • 조대승 (부산대학교 조선해양공학과) ;
  • 장흥규 (부산대학교 조선해양공학과) ;
  • 진병무 ((주)디섹 구조기본/상세설계부) ;
  • 김국현 (동명대학교 조선해양공학과) ;
  • 김성찬 (인하공업전문대학 조선해양과) ;
  • 김진형 ((주)크리에이텍 기술연구소)
  • Received : 2016.08.31
  • Accepted : 2016.09.22
  • Published : 2016.12.20
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Abstract

Precise propulsion shafting alignment of ships is very important to prevent damage of its support bearings due to excessive reaction forces caused by hull deflection, forces acted on propeller and crankshaft, and so forth. In this paper, a new iterative shafting alignment calculation procedure considering the interaction between shaft deflection and oil film pressure of Sterntube Journal Bearing (SJB) bush with single or multiple slopes is proposed. The procedure is based on a pressure analysis to evaluate distributed equivalent support stiffness of SJB by solving Reynolds equation and a deflection analysis of shafting system by a finite element method based on Timoshenko beam theory. SJB is approximated with multi-point biaxial elastic supports equally distributed to its length. Their initial stiffness values are estimated from dynamic reaction force calculated by assuming SJB as single rigid support. Then, the shaft deflection and the support stiffness of SJB are sequentially and iteratively calculated by applying a criteria on deflection variation between sequential calculation results. To demonstrate validity and applicability of the proposed procedure for optimal slope design of SJB, numerical analysis results for a shafting system are described.

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References

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