Effect of Pitch Moment of Inertia on Added Resistance of Container Ship in Waves

Abstract

Owing to the compelling demand for CO₂ reduction in recent years, various attempts have been expended to improve the resistance performance of ships in actual seas. In this study, the effect of the pitch moment of inertia on the added resistance in waves is investigated via tank tests and strip-method-based calculations for an S-175 container ship measuring a length (L) of 175 m. Consequently, when the pitch radius of gyration is reduced from 0.27L to 0.23L, it is discovered that the added resistance in waves reduced by approximately 30% for a ship moving with Froude number 0.15 in irregular head waves with a significant wave height of 4 m. In addition, the effect on the added resistance is significant in the head wave direction from 0° to 75° but insignificant in the beam and following wave direction from 90° to 180°. Hence, it is effective to reduce the pitch moment of inertia to improve the propulsive performance of a ship in waves.