CHINESE SHIP REPAIRING INDUSTRY GROWS UP WITH PAIN

In recent years,China has been in theheyday of ship repairing,Hence the relatedenterprises develop rapidly. With the rapid development of theship repairing industry,problems come outalso,such as project payment,ship repair-ing quality,shiP repairing safetymanagement.Such challenges are the risksto the ship repairing industry.Any slip ofthis kind could disrupt the ship repairingenterprises.Hence,how to avoid or mini-mize those risks and protect the interestsof the ship repairing enterprises is an im-portant task to them. 1.The matter of arrears is a

Risk Based Optimal Inspection and Repair Planning for Ship Structures Subjected to Corrosion Deterioration

A framework of risk based inspection and repair planning was presented to optimize for the ship structures subjected to corrosion deterioration. The planning problem was formulated as an optimization problem where the expected lifetime costs were minimized with a constraint on the minimum acceptable reliability index. The safety margins were established for the inspection events, the repair events and the failure events for ship structures. Moreover, the formulae were derived to calculate failure probabilities and repair probabilities. Based on them, a component subjected to corrosion is investigated for illustration of the process of selecting the optimal inspection and repair strategy. Furthermore, some sensitivity studies were provided. The results show that the optimal inspection instants should take place before the reliability index reaches the minimum acceptable reliability index. The optimal target failure probability is 10 -3 . In addition, a balance can be achieved between the risk cost and total expected inspection and repair costs by means of the risk-based optimal inspection and repair method, which is very effective in selecting the optimal inspection and repair strategy.

Study and Analysis of Obstacles and Challenges Facing Ship-Repair Industry in Iran

Nowadays, shipping industry which is the backbone of economic development has affiliated to ship maintenance and repair industry. This industry provides technical maintenance services to ships in a way to enable them to meet the requirements and regulations of the International Maritime Organization and maintaining the vessels at high technical standard & continual seaworthiness condition. Maintaining the minimum requirement of classification societies on the ships is solely taken place with repairs. The research method is an applied study in sake of aim and a descriptive study in sake of nature. This research has been conducted to examine causes and factors contributed to failures repairing in dry docks in the country;using the obtained results, an approach has been presented to reduce obstacles existing in country and reach to standard international levels. The problems include lack of suitable strategy, lack of government support, governmental facet of the structure of this sector, cumbersome laws, customs problems, lack of specialized workshops, low levels of technology and lack of new technology etc. Thus, by taking amendment to the cumbersome rules, taking advantage of industry and modern technology experts, increasing productivity and competitiveness, centralizing active domestic and foreign workshops at private sector, facilitating timely supply of parts and accessories, using research and development sector, increasing quality, reducing costs and repair time, selecting secure industrial- trade partner and etc. can pave the way in this context.

Cost-Benefit Assessment of Inspection and Repair Planning for Ship Structures Considering Corrosion Model Uncertainty

Owing to high costs and unnecessary inspections necessitated by the traditional inspection planning for ship structures, the risk-based inspection and repair planning should be investigated for the most cost-effective inspection. This paper aims to propose a cost-benefit assessment model of risk-based inspection and repair planning for ship structures subjected to corrosion deterioration. Then, the benefit-cost ratio is taken to be an index for the selection of the optimal inspection and repair strategy. The planning problem is formulated as an optimization problem where the benefit-cost ratio for the expected lifetime is maximized with a constraint on the minimum acceptalbe reliability index. To account for the effect of corrosion model uncertainty on the cost-benefit assessment, two corrosion models, namgly, Paik＇ s model and Guedes Soares＇ model, are adopted for analysis. A numerical example is presented to illustrate the proposed method. Sensitivity studies are also providet. The results indicate that the proposed method of risk-based cost-benefit analysis can effectively integrate the economy with reliability of the inspection and repair planning. A balance can be achieved between the risk cost and total expected inspection and repair costs with the proposed method, which is very. effective in selecting the optimal inspection and repair strategy. It is pointed out that the corrosion model uncertainty and parametric uncertaintg have a significant impact on the cost-benefit assessment of inspection and repair planning.

船舶修造企业火灾事故特征挖掘与致因分析

为探究船舶修造企业(SRBE)火灾事故的特征和致因,运用数理统计方法研究118起火灾事故,从事故的时空属性、火灾三要素和伤害严重程度进行事故特征挖掘;并基于改进的人因分析与分类系统(HFACS-SRBE)事故致因模型,采用卡方检验、让步比(OR)、克莱姆V系数(Cramer's V)方法,分析致因因素之间的相关性及其强弱。结果表明:14:00—16:00最易发生火灾事故和人员伤亡;火灾事故主要发生地点在船舶区域,占比为33.90%;59.19%的点火源是动火作业;无人员伤害、轻伤和轻微伤、重伤和死亡数量比值为61:54:3。通过相关性及其强弱检验后确定15组相邻层级致因因素存在相关性,并得到26条完整事故致因链。其中,沟通与协调→运行计划不适当→不良心理状态→决策差错是导致船舶修造火灾事故发生关联性强度最大的事故致因链。

紧抓四个“关键”做好船舶修期管控

针对修期管控的要求,文章探讨了确保船舶修理质量和缩短船舶在厂修理时间的方法,在全面总结修期管控实践工作经验的基础上,分析了影响修理进度和质量的潜在问题因素,着重在修前准备、方案制定、强化配合、全程监管这四个“关键”环节提出了针对性措施,为有效解决船舶用修矛盾、提升保障效益提供支撑。

影响船舶厂修效益的关键环节探究

随着自由船员的增多,船员责任心每况愈下,机务主管要把握船舶厂修的质量、效益面临愈来愈严峻的挑战。把控好影响船舶厂修效益的五个关键环节——修理工程单,询价、比价、还价,外协服务商选择,现场监督和审账——有利于提高船舶厂修效益。

探索智慧修船新模式

修船业作为全球航运业的重要组成部分,面临着修船周期长、工作效率低、人员培训成本高等诸多挑战。为了应对这些挑战,文章基于大数据管理分析、智能移动设备等创新技术,提出了一种智慧修船新模式,以大数据为支撑进行分析,实现数据的管理和调配应用。同时,文章介绍了无人机近观检验、AR远程检验和修船指挥中心3类智能化场景,深入分析了它们的技术原理和功能特点,并结合实际案例进行验证。研究结果表明,智慧修船新模式具有可行性,能够提升修船业务管理水平、工作效率以及人员整体素质,同时显著降低修船成本,增强企业在市场竞争中的优势。

LPG船修理安全管理标准化研究

液化石油气(LPG)船修理具有危险程度高、安全管理难度大等特点,文章根据近年来LPG船修理经验,结合船舶修造企业实际,研究制定了LPG船修理安全管理团队组建、安全教育培训、安全初始评估、项目6S管理、危险作业管控、设备设施管理、消防应急、完工总结等全流程安全管理要求,形成了系统化、规范化的LPG船修理安全管理标准。

5G与新兴技术应用赋能船舶修造

为推进5G与新兴技术在船舶修造业中的应用,对5G通信、人工智能、虚拟现实、区块链等新兴技术在船舶修造行业的应用情况进行介绍,并对船舶修造行业当前在应用新技术过程中遇到的困难进行分析。研究成果可为船舶修造行业数字化转型提供一定参考。

船舶修理中新材料与新工艺的应用研究

随着船舶工业研发技术的投入,加上航海运输业的快速发展,船舶修理新材料的选用成为航海领域节能环保的主要研究内容。文章旨在将新型材料及工艺创新理念融合到船舶维修作业过程中,提升维修效率、提高船舶性能。

搭建HSE管理体系在船舶修理安全管理中的应用分析

随着我国船舶修理行业的发展以及国家对于安全生产的要求,船舶修理行业存在现场作业环境复杂、工期紧、任务重等因素,造成现场安全管理难以把控。文章通过分析安全风险较大的船舶修理作业和影响现场安全施工因素,提出一套适应于船舶修理行业健康、安全和环境(HSE)管理体系。采用HSE管理体系达到船舶修理施工中的健康、安全和环境的目标,为船舶修理企业提供安全生产管理思路。

《香港公约》生效对我国修船业高质量发展的影响与对策研究

通过介绍《2009年香港国际安全和环境无害化拆船公约》(以下简称《香港公约》)涉及修船业的条款国内法律法规对船舶有害材料控制、清单制作的相关要求,以及船舶有害材料控制、清单制作的基本知识,以舟山修船业为例对我国修船业履行《香港公约》的现状进行了调研和深入分析,提出了基于履行《香港公约》的我国修船业高质量发展对策。

虚拟多视点舰船图像背景局部缺失修复方法

针对虚拟多视点舰船图像生成时,图像背景容易出现局部缺失的问题,研究虚拟多视点舰船图像背景局部缺失修复方法。依据舰船的多视点图像及相应视差图,利用反向映射方法生成舰船虚拟视点图像,将消除伪影后的舰船虚拟视点图像,合成为虚拟多视点舰船图像。利用图切割方法,构建虚拟多视点舰船图像前景与背景标号对应的吉布斯能量方程,确定各像素点的标号,自动分割虚拟多视点舰船图像。利用快速行进算法,依据由外至内的次序,依次修复图像背景中的局部缺失点,实现虚拟多视点舰船图像背景的局部缺失修复。实验结果表明,该方法可有效修复虚拟多视点舰船图像背景中的局部缺失,修复后图像像素点的峰值信噪比高于25 dB。

大型修造船舶码头系泊防台抗风研究

某岛致力于发展成为世界级海洋装备岛,船舶修造企业众多,停靠的大型修造船舶数量较多。大型修造船舶具有无动力、空载态、干舷高及受风面积大等特点,上海沿海经常遭受不同程度的台风袭击,严重影响大型修造船舶的系泊安全。通过对大型修造船舶码头系泊防台抗风的影响因素进行统筹分析,发现存在相关法律法规研究不足、缆绳管理不完善、船舶管控不科学、码头布置不合理及拖轮应急力量不足等薄弱环节,由此从法制、缆绳、船舶、码头及应急力量等角度提出相关建议。

基于时效性的舰船无线传感器网络修复方法

本文针对舰船无线传感器网络运行过程中因节点失效而产生多个覆盖空洞以及节点发生故障前所收集到的舰船航行数据丢失问题,提出一种基于时效性覆盖空洞修复(Timeliness Coverage Hole Repair,TCHR)算法。首先,基于备选移动节点的可持续最大移动时间,得到可选移动节点ID序列。然后,以可选移动节点总修复时间最小化为准则构造出目标函数。最后,构建时间代价矩阵,并基于匈牙利算法求得最优分配方案。所提算法能避免舰船航行数据丢失并选派合适的移动节点至相应的覆盖空洞处,从而完成舰船网络中多覆盖空洞及时修复的任务。仿真结果表明了所提算法的可行性与有效性。

CFRP修复的FPSO点蚀船体梁极限强度分析

采用非线性有限元法对中拱和中垂工况条件下碳纤维增强聚合物(Carbon Fiber Reinforced Polymer,CFRP)修复的浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)点蚀船体梁极限强度进行仿真分析。对比FPSO的完整船体梁、点蚀船体梁和CFRP修复的点蚀船体梁的中拱极限弯矩和中垂极限弯矩,分析CFRP对FPSO点蚀船体梁的修复效果,并分析胶层失效规律。结果表明,CFRP可为船舶的高效修复提供一种新的方式。

基于改进LSTM的航运物流路径轨迹修复研究

目的 提高航运物流路径轨迹信息的挖掘精度和安全效率。方法 对宁波舟山港条帚门水域窄口航道船舶的类型、数量、长度进行统计分析,对货运船AIS物流路径轨迹异常进行识别与修复。考虑船舶实际航行的环境因素,提出一种新的数据纠偏方法。考虑船舶属性与环境因素,以通航宽度和三自由度运动学的转向能力识别异常数据,然后运用Bi-LSTM法对筛选后航运物流路径进行轨迹修复。结果 所提筛选方法不需要轨迹聚类或建立额外的模型进行判别,筛选数据量占总数量的34.26%,修复后的AIS货船物轨迹数据量在原有基础上提升了115.34%。结论 使用文中方法可以有效纠偏和修复异常航运物流路径轨迹数据,为航运物流轨迹数据挖掘提供一定的基础方法。

基于信息化的修船移泊管理系统构建

分析国内修船企业的修船移泊管理现状和需求。基于移泊管理系统架构方案,运用信息化手段,将矢量化地图引擎、自动识别系统(Automatic Identification System,AIS)船舶动态定位和区域智能识别等技术融入现有的修船移泊管理中。构建基于信息化的修船移泊管理系统,解决修船移泊管理过程中的计划编排粗放和实际信息反馈不及时等问题,实现修船移泊管理中各部门之间的高效协同。

基于ANP的修船工人稳定性评价指标体系研究

当前,我国的船舶修理主体业务基本以外包为主,而外包的修船工人的频繁流动不利于修船企业的长期稳定发展,相反,稳定的修理工人会让船舶修理企业拥有更多可能,因此研究修船工人的稳定因素显得十分必要,本文采用网络层次分析(ANP),对修船工人稳定因素进行研究,得出结论。