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Study on Optimized Design of Ship Structure

船舶结构优化设计研究

基本信息

批准号：
05650945
负责人：
NOBUKAWA Hisashi
金额：
$ 1.41万
依托单位：
HIROSHIMA UNIVERSITY
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-05650945/
关键词：
Ship Structure Optimized Design Finite Element Method Multiplier Method Plastic Design Discrete Design Variable Matrix Transfer Method 二重殻船体構造 SUMT法

项目摘要

Optimized design of double hull structure for VLCC has been investigated.One tank structure based on plastic design is considered here.Since finite element method, which is mostly used for recent engineering problems, requires a lot of computing resources, the matrix transfer method is used in the one tank structure.The matrix transfer method is coupled with gframe structure method in order to compute 3-dimensional elastoplastic analysis.Weight and costs for constructing one tank are taken as objective functions.Finite elememt analysis is performed only for double bottom and bilge hopper tank structure based on the results obtained from the previously mentioned matrix transfer method.Optimization preocess is performed based on the finite element analysis for this localized structure.Only elastic design is considered in this optimization with applying resign constraint to the effective stresses in each element.Sensitivity analysis is introduced in this optimization in order for reducing computational load in finite element analysis.As an optimization technique, multiplier method is utilized resulting in removing the limitation on the initial condition.Since it is impossible to have continuous design variable in the real ship hull structure design, discrete design variable is also studied here.2 step optimization processes are held in this study for this purpose.In the first optimization step, all design variable are treated as continuous.In the second step, thicknesses of plates are set to be constant, while all other design variable are still taken as continuous.This 2 step optimization technique allows us to involve discrete design variable easily.Several problems are solved by the above mention method.Results show that the method introducted in this study gives us effective ship structure design.Both weigh and cost in constructing ship structure are decreased by using this method

对超大型油轮双层船体结构的优化设计进行了研究，以一个液舱结构为例，考虑到目前工程问题多采用有限元法，计算量大，将矩阵传递法应用于单容水箱结构，并将矩阵传递法与框架结构法耦合，计算3-本文采用三维弹塑性分析方法，以重量和建造费用为目标函数，根据矩阵传递法的计算结果，仅对双层底舱和舱底漏斗舱结构进行了有限元分析，并对双层底舱和舱底漏斗舱结构进行了优化设计局部化结构的优化设计，只考虑弹性设计，对每个单元的有效应力施加重约束，并引入灵敏度分析，以减少有限元分析的计算量，作为一种优化技术，由于真实的船体不可能有连续的设计变量，本文采用乘子法，消除了初始条件的限制在结构设计中，离散设计变量也被研究，为此，本研究采用两步优化过程，在第一步中，所有的设计变量被视为连续变量，在第二步中，板的厚度被设置为常数，而所有其他设计变量仍然是连续的。这种两步优化技术使我们能够很容易地涉及离散的设计变量。几个问题结果表明，本文所介绍的方法能有效地进行船体结构设计，减轻了船体结构的重量，降低了建造成本