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我国船舶工业面临的形势和挑战 总被引：3，自引：0，他引：3
在分析世界造船业形势的基础上,通过中、日、韩三国造船业情况对比,找出我国船舶工业与日本和韩国在造船技术等方面的差距和问题。从而提出新世纪发展我国船舶工业一些建议。 相似文献
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Corrosion of working chains continuously immersed in seawater 总被引：1，自引：0，他引：1
Robert E. Melchers Torgeir Moan Zhen Gao 《Journal of Marine Science and Technology》2007,12(2):102-110
Chains used in the offshore industry typically are exposed to continued high rates of corrosion, in part due to the working
of the chain not permitting a build up of protective rusts. Herein, a procedure is described for estimating the corrosion
loss of low-alloy steel chain under continued immersion corrosion conditions. The procedure is based on extensive recent investigations
of the effects of water temperature, salinity, water velocity, and surface roughness on steel corrosion under field conditions.
Since the working of the chain does not allow corrosion products (rust) to build up on the critical contact surfaces, erosion
due to wear and abrasion can be estimated separately. Two example applications are given. 相似文献
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Steel catenary riser is a long-established option for subsea projects in deep-water regions. Sustained pulling force of steel catenary risers on subsea flowlines in combination with cyclic thermal load throughout the system lifetime may lead to progressive global axial displacement of subsea pipelines which has been termed as ‘walking’. One of the challenges in the deep-water industry is long-term walking of subsea flowlines in a cumulative manner. Common practice methods for walking mitigation are quite expensive operations. State-of-the-art mitigation strategies are proposed in the paper by means of modifying pipe pieces before the installation operation. Bowed pipe pieces and miter joints are two recommended approaches for walking mitigation. The presented mitigation strategies are relatively cost-effective solutions for the pipe-walking challenge and they are able to considerably cease the potential cyclic walking. Comprehensive FE analyses in ABAQUS software are performed to evaluate the proposed deformed pipelines response subject to two loading conditions. Through-life integrity of the suggested pre-deformed pipeline is assessed in terms of effective axial force, local buckles and excessive axial strains. A comparison of the presented method with conventional techniques shows the effectiveness of the proposed configuration. The proposed methods can significantly reduce effective axial force throughout the subsea pipeline by means of artificially introduced deformations. The cumulative walking of the presented method is practically zero. In addition, the influence of combined triggering mechanisms to the walking phenomenon is assessed when the pipeline is located on a sloping seabed and it is subject to non-uniform thermal loads. A parametric study is performed to improve confidence in design and provide a reasonably practical technique with an optimal shape. 相似文献
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High-cycle fatigue experiments are performed on welded tubular steel X-joints, with braces and chord of equal diameter. They are scaled-down joints, used extensively in offshore wind platforms. Three different welding procedures are considered in specimen fabrication: manual, fully-automatic and manual with HFMI post-weld treatment. Τwo possible locations for crack initiation were identified: chord “crown” and “in-between location”, also verified by numerical calculations and fractography of failed specimens. Monotonic loading tests on fatigue-cracked specimens showed good performance in terms of ultimate strength and deformation capacity, despite the presence of through-thickness cracks. The results are compared with predictions from relevant design standards. 相似文献
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本文阐述了节点验证的依据、主要内容,以广州海事局（广东省船舶检验局广州分局）开展节点验证的情况进行经验提炼,并对存在的问题进行了思考分析,为进一步提高建造船舶质量提出建议和对策。 相似文献
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采用“成组—相似工程”技术创建我国现代造船模式 总被引：1，自引：0，他引：1
分析了国内造船业１０余年来引进国外先进船技术中存在的问题,阐述了采用“成组－相似工程”技术对建立甸现代造船模式的重要性和急迫性,并建议通过国际合作,跨跃式地实现我国船舶生产的敏捷制造模式。 相似文献
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在20世纪90年代,国外先进船厂通过研究应用CIMS技术,逐步由“分道制造、设备密集”传统造船模式发展到“集成制造、信息密集”的现代造船模式,实现了“生产效率大幅度提高、生产成本明显降低”的目标。要实现我国造船生产的“跳跃式”发展,就必须按照党的“十六大”精神,认真研究借鉴国外现代造船技术,尤其是信息技术的应用经验,用先进适用技术改造传统造船产业。 相似文献
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Failures caused by the combined actions of fatigue, corrosion and wear are important safety concerns for mooring chains used on floating structures in the oil and gas industry. Prediction of remaining corrosion fatigue life based on surface condition could therefore be a useful tool for the continued safe operation of corroded chains. This paper investigates the use of crack growth modelling for estimating the remaining corrosion fatigue life of mooring chains that exhibit significant pitting corrosion damage. A crack growth modelling approach is used to produce remaining fatigue life estimates for a selection of severely pitted mooring chains. Using fatigue crack growth rate test results for grade R4 high strength mooring chain steel, empirical crack growth laws are presented for free corrosion and cathodic protection conditions at load ratio R = 0.1. Two different methods for establishing equivalent cracks from surface scans of corrosion damage are presented. The mooring chains are proof loaded as part of their manufacturing process. Residual stresses introduced during this process have therefore been determined by finite element analysis and accounted for in the fatigue crack growth predictions. One of the equivalent crack models, accounting for the single dominant corrosion pit, provided quite accurate fatigue life predictions when compared with full scale test results. 相似文献
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结合某系列船船舶建造船舶检验,对船舶轴系安装前环境条件及实际轴系安装过程中的照光过程、艉管镗孔、轴承压装等工艺进行梳理分析。通过轴系安装检验过程中发现的尾轴内部缺陷和轴承安装超压案例,结合轴系安装工艺梳理分析结果,提出铸钢件丝状缺陷和压装失败后铸钢件产生严重缺陷相关规范要求及解决方案,通过查找根源问题对轴系安装工艺提出改进建议。为未来大型化,精细化船舶建造中轴系工艺顺利进行打下坚实基础。 相似文献
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加入WTO后对我国船舶工业的影响及应对 总被引：5，自引：0，他引：5
该文介绍了世界造船业和我国造船业的现状 ,分析了我国加入WTO后对我船舶工业的影响及所面临的挑战 ,并提出了一些应考虑的意见。 相似文献
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以逐步回归分析和改进的Ｂ－Ｐ神经网络两种方法为算法,基于Ｍｉｃｒｏｓｏｆｔ Ｖｉｓｕａｌ Ｂａｓｉｃ３．０软件平台,应用实船板样本数据,开发了水火弯板局部收缩量的建模系统。 相似文献
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造船技术水平评价研究 总被引：1，自引：0，他引：1
为使我国船舶工业持续稳定地发展,对我国造船技术在国际上所处的地位有一个比较客观的,定性与定量相结合的评价,编制了造船技术水平评价体系及其数据处理软件,并通过专家咨询调查,得到了我国８家船厂的评价数据。 相似文献
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钢板水火加工变形主要参数实验分析 总被引：4，自引：0，他引：4
在对实验钢板进行水火加工变形系列板厚试验的基础上,建立了钢板局部变形与主要影响参数关系的数学模型,补充了实船板数据的不足,为水火弯板工艺参数设计提供参考。 相似文献
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本文就当前中国造船在世界造船中心东移的历史机遇中做大做强造船业的具体考量指标,做了初步探讨,旨在为中国造船业的蓬勃发展作一些有所裨益的努力和尝试。 相似文献