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

The Society of Naval Architects of Korea (대한조선학회)
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Computation of Design Pressure against the Bow Bottom Slamming Impact

선수부 선저 슬래밍 충격에 대비한 설계압력의 산출

  • Kim, Yong Jig (Department of Naval Architecture and Marine Systems Engineering, Pukyong National University) ;
  • Lee, Seung-Chul (Department of Naval Architecture and Marine Systems Engineering, Pukyong National University) ;
  • Ha, Youngrok (Department of Naval Architecture and Ocean Engineering, Koje College) ;
  • Hong, Sa Young (Korea Research Institute of Ships and Ocean Engineering)
  • 김용직 (부경대학교 조선해양시스템공학과) ;
  • 이승철 (부경대학교 조선해양시스템공학과) ;
  • 하영록 (거제대학교 조선해양공학과) ;
  • 홍사영 (선박해양플랜트연구소)
  • Received : 2018.01.31
  • Accepted : 2018.02.26
  • Published : 2018.06.20
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Abstract

Ship's bottom slamming has been studied by many researchers for a very long time. But still some ships suffer structure damages caused by the bottom slamming impacts. This paper presents a practical computation method of the design impact pressure due to ship's bow bottom slamming. Large heave and pitch motions of a rigid hull ship are simulated by the nonlinear strip method in time domain and the relative colliding velocity between the bow bottom and the water surface is calculated using the simulated ship motions. The bottom slamming impact pressure is calculated as a product of the relative colliding velocity squared and the bottom slamming pressure coefficient that is obtained by modification of the SNAME pressure coefficients based on Ochi's slamming experiments. Not only the bottom slamming pressures but also the required bottom plate thicknesses are calculated and compared with those of the classification society rules. The comparisons show good agreements and it is confirmed that the present method is practically very useful for the bottom structure design against ship's bow bottom slamming impacts.

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References

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