陈杨科, 余恩恩, 骆伟, 王红旭, 程远胜. 内压下矩形耐压舱内部结构优化设计[J]. 中国舰船研究, 2017, 12(6): 81-85. DOI: 10.3969/j.issn.1673-3185.2017.06.012
引用本文: 陈杨科, 余恩恩, 骆伟, 王红旭, 程远胜. 内压下矩形耐压舱内部结构优化设计[J]. 中国舰船研究, 2017, 12(6): 81-85. DOI: 10.3969/j.issn.1673-3185.2017.06.012
CHEN Yangke, YU Enen, LUO Wei, WANG Hongxu, CHENG Yuansheng. Optimal design of internal structure of rectangular cabin under internal pressure[J]. Chinese Journal of Ship Research, 2017, 12(6): 81-85. DOI: 10.3969/j.issn.1673-3185.2017.06.012
Citation: CHEN Yangke, YU Enen, LUO Wei, WANG Hongxu, CHENG Yuansheng. Optimal design of internal structure of rectangular cabin under internal pressure[J]. Chinese Journal of Ship Research, 2017, 12(6): 81-85. DOI: 10.3969/j.issn.1673-3185.2017.06.012

内压下矩形耐压舱内部结构优化设计

Optimal design of internal structure of rectangular cabin under internal pressure

  • 摘要:
      目的  为有效降低内压下矩形耐压舱板架弯曲应力,
      方法  分别提出内压下矩形耐压舱内部平台位置和支柱布局以及尺寸优化设计数学模型。以内部平台垂向位置作为设计变量,极小化横纵舱壁结构的最大弯曲应力,采用遗传算法求解,得到最优的内部平台布置位置,其优化结果接近垂向均布。支柱设计采用分级优化设计方法,先以等刚度支柱位置作为设计变量,极小化顶甲板结构的最大弯曲应力,分别得到不同支柱数量下的最优布局方案;然后依据应力约束条件选取支柱数量及布局,在此基础上进一步以支柱截面尺寸作为设计变量,以基础优化方案的重量作为约束,极小化顶甲板结构的最大弯曲应力,得到不等刚度支柱最优截面尺寸。
      结果  其优化结果显示偏中心区域支柱截面积更大。最终优化设计方案较初始方案,横舱壁、纵舱壁和顶甲板弯曲应力分别降低了28.3%,25.7%和13.9%。
      结论  本优化设计方法可为类似结构设计提供方法参考和设计借鉴。

     

    Abstract:
      Objectives  In order to efficiently reduce the bending stress of a grillages in a rectangular cabin under internal pressure, mathematical models for the optimization of the vertical positions of platforms and size and layout of pillars are proposed respectively.
      Methods  The vertical positions of the two internal platforms are taken as the design variables, the maximum bending stress of the transverse and longitudinal bulkhead structure is minimized, and the optimal positions of the internal platforms are obtained via a genetic algorithm. The optimization results show that the best positioning of platforms is close to the vertical uniform distribution. A stepwise optimal pillar design method is proposed. First, the maximum bending stress of the top deck structure is minimized by taking the positions of pillars with the same stiffness as the design variables. Through the repeated use of the model, optimal layout schemes under different numbers of pillars can be obtained in succession. The number and layout of the pillars are then selected according to the stress constraints. To further reduce the maximum bending stress of the top deck structure under a given number and layout of pillars, a mathematical model for the optimal variable stiffness of pillars is proposed. In this study, pillar cross-section size is treated as a design variable, the weight of the pillars in the previous round of optimization design is treated as the constraint, and the maximum bending stress of the top deck structure is minimized.
      Results  The optimization results show that the pillars in the central zone are large than those in other regions. By using the proposed optimal design models, the maximum bending stress of the transverse and longitudinal bulkheads and top deck is reduced by 28.3%, 25.7% and 13.9% respectively.
      Conclusions  The proposed method can provide reference points for comparable structural design.

     

/

返回文章
返回