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A Study on the Necessary Thrust of Tugs through the Ship's Towing Test

실선 예항시험을 통한 예인선의 소요마력 산출에 관한 연구

  • Received : 2014.07.08
  • Accepted : 2014.08.27
  • Published : 2014.08.31

Abstract

It needed the calculation of the required tugboat's power to move the damaged vessel to the safe area for reducing the additional damages. In this paper, it was verified the theoretical calculation method on the required power of tugboat through the 93m real ship tests. From the experiments, it was considered that the theoretical calculation method was sufficient to estimate the required power of tugboat. The resistance of the locked propeller was relatively big portions compared with other static resistances such as air resistance, frictional resistance and residual resistance. And dynamic resistance induced by swing movement and yawing was continuously occurred and it also was great effects on the total resistance. In the future, the safety factor will be considered and the exact prediction of ship's resistance will enhance the efficiency of tugboat because of the minimization of safety factor.

사고선박의 2차적인 피해를 줄이기 위해서는 사고선박을 안전한 곳으로 이동시키기 위한 예인선의 소요마력 산출이 요구되며, 길이 93 m 여객선형 대상선박에 대한 실선실험을 통하여 소요마력 산출에 대한 이론적인 계산식의 유효성을 검증하였다. 실선실험 결과는 이론계산 결과와 비교해 볼 때 상당히 일치되어 예선의 소요마력 산정을 위해 사용하기에 충분하다고 판단되며, 정적저항에서 공기저항, 마찰저항, 잉여저항과 더불어 프로펠러 고착저항이 상대적으로 큰 값으로 평가되었다. 피예인선은 예인과정에서 좌우 측면으로 $30^{\circ}$정도까지 스윙운동 및 요우잉이 발생하였으며, 이로 인한 동적저항이 큰 값으로 평가되었다. 추후 안전율에 대한 연구가 필요할 것으로 판단되며, 저항의 정확한 예측을 통하여 안전율을 최소화함으로써 경제적인 예인선의 사용이 가능할 것으로 판단된다.

Keywords

References

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