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<p>In the design process of high-speed craft, the motions and exerting acceleration on the craft in waves are of great importance. Due to the relatively small size of this type of vessel, they incur more intensive motions and higher accelerations in the presence of waves. In the current study, the behavior of four configurations of baseline, wedge-mounted, wedge-mounted single-stepped, and double-stepped planing hulls in irregular waves were experimentally studied. All models have a length of 2.6 m, a beam of 55 cm, and weigh 86 kg. The considered irregular wave was generated using the JONSWAP spectrum and had a characteristic height of 12 cm and a peak period of 1.6 s. These models were towed at beam Froude numbers ranging from 2.15 to 3.44. The analysis of heave and pitch displacements of these models demonstrated that simultaneous use of a single-step and a stern wedge can reduce the heave and pitch double-amplitudes of the planing hull up to 33% and 60%, respectively. Nevertheless, the double-stepped model was the least successful model in heave and pitch displacements reduction, achieving a maximum of 27% and 18% reduction for heave and pitch displacements, respectively. Regarding the vessel accelerations of these vessels, the wedge-mounted single-stepped hull resulted in 34% and 16% reductions in the accelerations in its center of gravity and bow, respectively, in comparison with the baseline model values. However, using two steps could only reduce these two types of acceleration by 10% and 4%, respectively.</p>

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Singular and simultaneous effects of step and stern wedge on high-speed craft behavior in irregular waves: experimental and statistical assessment

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Parviz Ghadimi,
  • Sayyed Mahdi Sajedi,
  • Aliakbar Ghadimi

摘要

In the design process of high-speed craft, the motions and exerting acceleration on the craft in waves are of great importance. Due to the relatively small size of this type of vessel, they incur more intensive motions and higher accelerations in the presence of waves. In the current study, the behavior of four configurations of baseline, wedge-mounted, wedge-mounted single-stepped, and double-stepped planing hulls in irregular waves were experimentally studied. All models have a length of 2.6 m, a beam of 55 cm, and weigh 86 kg. The considered irregular wave was generated using the JONSWAP spectrum and had a characteristic height of 12 cm and a peak period of 1.6 s. These models were towed at beam Froude numbers ranging from 2.15 to 3.44. The analysis of heave and pitch displacements of these models demonstrated that simultaneous use of a single-step and a stern wedge can reduce the heave and pitch double-amplitudes of the planing hull up to 33% and 60%, respectively. Nevertheless, the double-stepped model was the least successful model in heave and pitch displacements reduction, achieving a maximum of 27% and 18% reduction for heave and pitch displacements, respectively. Regarding the vessel accelerations of these vessels, the wedge-mounted single-stepped hull resulted in 34% and 16% reductions in the accelerations in its center of gravity and bow, respectively, in comparison with the baseline model values. However, using two steps could only reduce these two types of acceleration by 10% and 4%, respectively.