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

The Society of Naval Architects of Korea (대한조선학회)
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A Numerical Study on the Maneuverability of a Twin-Screw LNG Carrier under Single Propeller Failure

쌍축 추진 LNG선의 단독 추진기 고장 상태에서의 조종성능에 대한 수치적 연구

  • You, Youngjun (Daewoo Shipbuilding and Marine Engineering Co., LTD. (DSME)) ;
  • Choi, Jinwoo (Daewoo Shipbuilding and Marine Engineering Co., LTD. (DSME))
  • Received : 2016.11.17
  • Accepted : 2017.04.24
  • Published : 2017.06.20
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Abstract

Recently, ship owners have been requiring the assessment of the maneuverability of a twin-screw ship under machinery failures. In this paper, we are only focused on the propulsion failure among propulsion failure, power supply failure, steering system failure etc. First of all, the mathematical model for the twin-screw 174K LNGC is verified by comparing the simulated results for $35^{\circ}$ turning test, $10^{\circ}/10^{\circ}$ zigzag test and $20^{\circ}/20^{\circ}$ zigzag test under normal operating condition and those obtained from free running model tests. And, sea trial results of 216K LNGC under single propeller failure are compared with those of 174K LNGC under identical condition to verify the proposed method to predict maneuverability under single propeller failure. After the straight line maneuver is simulated under the single propeller failure, the speed and equilibrated heading and rudder deflection angles at steady state are predicted. After the IMO maneuvering tests are simulated under the single propeller failure, the results are reviewed to investigate the maneuvering characteristics due to the failure.

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References

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