基于模糊评判的船型变换法及软件实现

将模糊理论应用到船体线型设计中,提出了一种新的横剖面面积曲线生成和线型变换法。特点是在给定方形系数 Ｃ_ｂ、浮心纵向位置 Ｌ_（ｃｂ）和傅汝德数 Ｆｎ后自动或人机交互地调整模糊权函数,生成一系列满足设计要求的船体横剖面面积曲线。在给定母型船后就能生成系列新船型供进一步优选,使计算机辅助船体线型设计更加灵活、方便和实用。２０００ｔ供油船、２８０００ｔ多用途船和１５００００ｔ油船的线型设计,证明了该方法的先进性和实用性。     

大方形系数低速船艉部线型多目标优化设计

本文结合船型设计技术的最新发展动态,将高精度CFD数值评估技术与优化理论及船体几何自动重构技术相整合,建立了“以精细数值评估优化为特征”的船型设计方法。以阻力性能优异的6600DWT 散货船作为优化设计对象,总阻力和桨盘面流场品质作为目标函数,采用多目标粒子群优化算法（MOPSO）、FFD几何重构方法对船艉线型进行了自动优化设计。结果表明：在满足工程约束条件的情况下,6600DWT散货船优华设计方案阻力的收益较为显著,其中一个优方案在尾部流场质量改善的情况下,剩余阻力减小了10.3%。     

A statistical investigation of time-variant hull girder strength of aging ships and coating life

Risk- and reliability-based approaches are increasingly being applied in assisting inspection and maintenance planning. One of the keys to such approaches is properly predicting the hull girder strength (HG) of gradually degradated hull structures. The development has been limited by the lack of data on aging ships—validation of the developed methods has not been possible. To fill the gap of knowledge on hull strength of ships in service, this paper presents a database of as-gauged hull structures and a statistical study of the time-variant HG of tankers. The expanded data set was collected from 2195 as-gauged girth belts (transverse sections) of 211 single-hull tankers that were 12–32 years old. It was intended to (1) provide actual data on hull girder section modulus (HGSM) of tankers, (2) investigate the general trends of the change in the HG over ships’ service life, and (3) propose formulations for presenting time-variant HGSM and coating life.

The data set demonstrated a high variation of HGSM that changed over time. The mean value and standard deviation of HGSM loss were derived as functions of time. The probability density function (pdf) of coating life was also derived. Comparisons were made between previous studies on HG and the current data set. It was found that almost all previous studies showed much greater HG loss than what this database revealed. The refinement of existing calculations appears to be needed. The data set and statistical study were expected to form the basis for validating formulations of HG that are key components in risk- and reliability-based approaches.     

水下船体表面清刷机器人方案研究

介绍一种新型的用于船体表面清刷、涂装等作业的水下船体表面清刷机器人总体组成、基本功能和工作原理，并提出了机械本体、清刷作业装置和控制系统三部分的设计方案。该机器人具有工作效率高，安全性好等优点。     

VLGC全船结构有限元分析研究

超大型全冷式液化气船（VLGC）由于其结构的复杂特性,需进行全船结构有限元分析以准确评估结构强度。本文对VLGC全船有限元分析方法、流程进行了研究,对一系列技术关键点进行了讨论,并结合目标船进行FEA建模和计算分析工作。对计算结果进行了分析和讨论,得出相关结论,对该类复杂船型的主船体结构、支承系统以及A型独立液货舱的设计具有重要参考意义和指导作用。     

Effect of pitting corrosion on the ultimate strength of steel plates subjected to in-plane compression and bending

Corrosion pits with a circular cone shape are typically observed on coated hold frames of aged bulk carriers which carry exclusively coal and iron ore. In order to ensure the safety of these types of bulk carrier, it is necessary to understand the effect of pitting corrosion on the local strength of hold frames. In order to investigate this effect, a series of nonlinear finite-element (FE) analyses has been performed with pitted plates subjected to in-plane compressive loads and bending moments. It has been shown that the ultimate compression load or bending moment of pitted plates is smaller than that of uniformly corroded plates in terms of average thickness loss, and that predictions of the ultimate strength using the average thickness loss at the minimum cross section would be conservative. In order to establish a method of evaluating strength reduction due to pitting corrosion, it is important to identify the failure mode that would be most detrimentally affected by pitting corrosion. It was found that the reduction of the ultimate compressive load or bending moment due to pitting corrosion is smaller than that of the tensile strength in terms of equivalent thickness.     

中小型船厂船体建造精度控制研究

文章通过对船舶建造精度控制工艺概念和内容的阐述,分析国内外精度管理和研究水平的进展和现状,探讨了制约中小型船厂发展精度控制技术的因素,并提出了相应的对策。     

Incorporated probability that a fleet meets a given permissible value for the hull girder section modulus loss

The paper presents a study on the incorporated probability that a tanker fleet meets a given permissible value of hull girder strength loss. The analysis was based on a database of hull girder section modulus (HGSM) for as-gauged girth belts of tankers. It was found that its mean value is below 5% over the entire life span of the analyzed tanker fleet. The Weibull probabilistic distribution was found to best represent the time-varying HGSM loss. A method was developed for calculating the incorporated safety of a fleet. As an example, the IMO requirement for a maximum HGSM reduction of 10% relative to its required value was analyzed, accounting for time-variant HGSM loss and including a probabilistic model for coating longevity. The views expressed in the paper are those of the authors and not necessary those of ABS.     

双层底分段建造过程的方案选优

介绍了双层底分段的七种建造方案，对建造流程进行了分析，并以韩国大宇的一个实际双层底分段的建造为例，用建造时间，建造工时以及其他若干评判准则比较了不同方法的优劣，找出最优的建造方案。     

水下潜器采用FBG传感监测系统的模型试验研究

本文依据水下潜器服役期间耐压船体结构的强度保障需求,以光纤光栅(FBG)原理为基础,结合水下潜器结构特征和工作环境特性,设计光缆穿舱结构组件,通过穿舱结构耐压试验和模拟工况联调试验,论证整个测试系统的可行性,为大型水下潜器结构的安全监测及结构状态识别与结构安全评估等进一步的工作奠定坚实的基础。