In this paper, added resistances acting on a hull of non ballast water ship(NBS) in high waves is discussed. The non ballast water ships were developed at the laboratory of the authors at Osaka Prefecture University, ...In this paper, added resistances acting on a hull of non ballast water ship(NBS) in high waves is discussed. The non ballast water ships were developed at the laboratory of the authors at Osaka Prefecture University, Japan. In the present paper, the performances of three kinds of bow shapes developed for the NBS were theoretically and experimentally investigated to find the best one in high waves. In previous papers, an optimum bow shape for the NBS was developed in calm water and in moderated waves. For a 2 m model for experiments and computations, the wave height is 0.02 m. This means that the wave height is 15% of the draft of the ship in full load conditions. In this paper, added resistances in high waves up to 0.07 m for a 2 m model or 53% of the full load draft are investigated. In such high waves linear wave theories which have been used in the design stage of a ship for a long time may not work well anymore, and experiments are the only effective tool to predict the added resistance in high waves. With the computations for waves, the ship is in a fully captured condition because shorter waves, λ/Lpp<0.6, are assumed.展开更多
提出一种计算V型无压载水船这种特殊船型结构疲劳寿命的新方法,该方法不受船型、航区航线及分析部位的限制,具有通用性。通过结合综合海洋决策支持系统(Integrated marine decision support system)提供的海浪数据,采用Matlab编程,得到...提出一种计算V型无压载水船这种特殊船型结构疲劳寿命的新方法,该方法不受船型、航区航线及分析部位的限制,具有通用性。通过结合综合海洋决策支持系统(Integrated marine decision support system)提供的海浪数据,采用Matlab编程,得到只属于所计算船的特定的散布图和营运特性表。然后,通过SESAM软件计算在该营运特性表下的载荷,采用ABAQUS建模计算热点应力。最后,计算结构的疲劳寿命。结果表明,经过舱口优化后,无压载水船舱口角隅的疲劳寿命要高于母型船。展开更多
文摘In this paper, added resistances acting on a hull of non ballast water ship(NBS) in high waves is discussed. The non ballast water ships were developed at the laboratory of the authors at Osaka Prefecture University, Japan. In the present paper, the performances of three kinds of bow shapes developed for the NBS were theoretically and experimentally investigated to find the best one in high waves. In previous papers, an optimum bow shape for the NBS was developed in calm water and in moderated waves. For a 2 m model for experiments and computations, the wave height is 0.02 m. This means that the wave height is 15% of the draft of the ship in full load conditions. In this paper, added resistances in high waves up to 0.07 m for a 2 m model or 53% of the full load draft are investigated. In such high waves linear wave theories which have been used in the design stage of a ship for a long time may not work well anymore, and experiments are the only effective tool to predict the added resistance in high waves. With the computations for waves, the ship is in a fully captured condition because shorter waves, λ/Lpp<0.6, are assumed.
文摘提出一种计算V型无压载水船这种特殊船型结构疲劳寿命的新方法,该方法不受船型、航区航线及分析部位的限制,具有通用性。通过结合综合海洋决策支持系统(Integrated marine decision support system)提供的海浪数据,采用Matlab编程,得到只属于所计算船的特定的散布图和营运特性表。然后,通过SESAM软件计算在该营运特性表下的载荷,采用ABAQUS建模计算热点应力。最后,计算结构的疲劳寿命。结果表明,经过舱口优化后,无压载水船舱口角隅的疲劳寿命要高于母型船。
