On the Wave Loads for Accurate Structural Design of Ships

船舶精确结构设计中的波浪载荷

• 批准号: 05650948
• 负责人: FUKASAWA Toichi
• 金额: $ 1.47万
• 依托单位: KANAZAWA INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650948/
• 关键词: Structural Design of Ships; Hydrodynamic Pressure in Waves; Fatigue Strength; Sub-Structured Model; Unbalanced Force; Boundary Condition

As for the recent structural design of a ship, direct strength calculations are approved in classification society's rules, and wave loads for the calculation are given. However, it is questionable to apply such wave loads to the investigation of fatigue strength of a ship. In fatigue analysis of a ship, it is most important to estimate accurate pressure fluctuations in time and space. The stress fluctuation can be calculated with the use of the pressure fluctuations.In this research, the fluctuations of wave pressure in time and space were calculated firstly. Surveying the pressure distributions along ships' hull, 4 typical patterns of distribution of pressure fluctuation were introduced for fatigue analysis of ships. Using this pressure, structural analyzes for fatigue strength of a ship can be conducted with the use of a sub-structured model of the ship.In the structural analysis using the sub-structured model, however, it is not easy to apply the adequate unbalanced force and to set up the proper boundary conditions. Several empirical techniques were adopted to overcome such the difficulties so far. In this research, several methods to treat the unbalanced force and the boundary conditions in the sub-structured model of the ship were investigated secondly, and the effects of each treatment on the stress were clarified.With the use of the introduced pressure distribution patterns, structural analyzes were performed for a sub-structured model with proper unbalanced forces and boundary conditions surveyed herein. The stress distributions on the inner bottom plate and the bilge hopper tank plate were investigated, and the design wave loads for fatigue analysis of a ship are classified.

对于目前的船舶结构设计，船级社的规范认可直接强度计算，并给出了计算所需的波浪载荷。然而，将这种波浪载荷应用于船舶疲劳强度的研究是值得怀疑的。在船舶疲劳分析中，准确地估计压力在时间和空间上的波动是最重要的。本文首先计算了波浪压力在时间和空间上的波动，然后计算了波浪压力在时间和空间上的波动。通过对船舶船体沿着压力分布的调查，介绍了4种典型的压力脉动分布模式，用于船舶疲劳分析。利用该压力，可以利用船舶的子结构模型进行结构疲劳强度分析，但在利用子结构模型进行结构分析时，不容易施加足够的不平衡力和设置适当的边界条件。迄今为止，为克服这些困难，采用了几种经验技术。其次，研究了船体子结构模型中不平衡力和边界条件的几种处理方法，阐明了各种处理方法对应力的影响，并利用所介绍的压力分布模式，对适当不平衡力和边界条件的子结构模型进行了结构分析。分析了内底板和舱底底板的应力分布，并对疲劳分析所需的设计波浪载荷进行了分类。

项目成果

深沢,塔一・服部,陽一・大字,正晃・諸田,博: "大型船の疲労強度検討のための波浪変動圧分布に関する研究" 日本造船学会論文集. 第174号. 261-273 (1993)

Fukazawa、Toichi 和 Hattori、Yoichi 和 Oaza、Masaaki 和 Morota、Hiroshi：“大型船舶疲劳强度研究的波浪波动压力分布研究”日本造船学会会刊第 174. 261-273 号（1993 年）。 ）

深沢塔一、服部陽一、大字正晃、諸田博: "大型船の疲労強度検討のための波浪変動圧分布に関する研究" 日本造船学会論文集. 第174号. 261-273 (1993)

Toichi Fukasawa、Yoichi Hattori、Masaaki Oaza、Hiroshi Morota：“大型船舶疲劳强度研究的波浪波动压力分布研究”日本造船学会学报第 174 期。261-273（1993 年）。

Toichi Fukasawa,Yoichi Hattori,Yasuhiro Kawai: "On the boundary conditions in the structural analysis of ships" Proc.of Eighth Technical Exchange and Advisory Meeting,TEAM-TAPEI'94. 139-153 (Dec.1994)

Toichi Fukasawa、Yoichi Hattori、Yasuhiro Kawai：“论船舶结构分析中的边界条件”Proc.of 第八次技术交流和咨询会议，TEAM-TPEI94。

Toichi Fukasawa,Yoichi Hattori,Yasuhiro Kawai: "On the boundary conditions in the structural analysis of ships" Proc.of Eighth Technical Exchange and Advisory Meeting, TEAM-TAPEI'94. 139-153 (1994)

Toichi Fukasawa、Yoichi Hattori、Yasuhiro Kawai：“船舶结构分析中的边界条件”Proc.of 第八次技术交流和咨询会议，TEAM-TAPEI94。

T.Fukasawa et al.: "Hydrodynamic Pressure Distribution for Fatigue Analysis of Large Ships in Waves" J.Society of Naval Architects of Japan. Vol.174. 261-273 (1993)

T.Fukasawa 等人：“波浪中大型船舶疲劳分析的流体动力压力分布”J.Society of Naval Architects of Japan。