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胎架作为船舶分段建造变形控制的重要工装,但不具有联合调控与自适应控制能力,无法快速响应分段建造质量问题,为此本文提出基于模糊PID控制的船用胎架高度联控方法.首先,基于船舶分段拟合曲面建立胎架高度补偿模型,为胎架的自适应调控提供依据;其次,基于分段变形范围和受压载荷构建胎架间关联机制,达到胎架系统的动态联调;然后,利用... 相似文献
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在前期研制的新型数控活络头通用胎架基础上,针对该胎架在大曲度曲面分段制造时行程及转场便捷性不足的问题,提出一种模块化柔性装置。该装置由连接机构、框架平台、支撑调节模块和移动机构组成,在不改变原数控活络头胎架支柱规格的前提下,可提高胎架的调节范围,而且其通用性和灵活性更佳,适合各种曲面分段的建造。 相似文献
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一、概述船体曲面分段建造过程中,胎架是一种重要的工艺装备。艏艉部分的外板分段一般跟基准平面(水平面、纵剖面、横剖面)保持倾斜。因此,必须对胎架底面位置进行转换。最理想的转换结果,应该是外板表面上各点到胎架底面距离的最大差值为最小。符合这个条件的胎架底面称为理想胎架底面。采用理想底面的胎架对模板式胎架来说,其用料最省;对支柱式胎架来说,其支柱调节高度差为最小。本文介绍理想胎架电子计算机辅助设计的数学模型和计算方法。其特点是,应用机械制 相似文献
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由于电算技术、精度造船和现代化造船设备广泛应用,以及采用高效焊接工艺控制变形,分段的形状与尺寸已不必依赖于胎架强制成形,从而有可能使用支柱式胎架来制造船体分段。本文分析了此种胎架的优点,并提出了在中华造船厂沪南分厂推广支柱式胎架的实施方案的建议。 相似文献
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为提高船舶分段建造效率,提出了适合于大中型造船厂的柔性胎架设计方法.较详细地介绍了柔性胎架的设计方案,分析了相对于传统模板胎架和管式活动胎架的优越性,阐述了生成柔性胎架的关键技术,即从船体型值信息到柔性胎架坐标信息的转换过程.研究成果对提高船舶建造速度及精度,降低成本,具有较大的现实意义和理论价值. 相似文献
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为了保证船体外形与设计理论线型吻合,在船体分段建造及整体建造时,都必须按照设计线型设计制造出分段及总段建造胎架。复杂完整的胎架实际上是整个船体的外模,所以用在制造胎架上的工时及材料甚多,势必增加建造成本,影响生产进度。据有关资料统计,复杂胎架所耗材料占船体总材料的30%以上,计划工时占26%左右,建造成本占船体总成本的15.4%。因此胎架形式的选择,是船体建造中需要着重考虑的问题。为了使胎架既保证船舶 相似文献
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改革船体分段中合拢用胎架,缩短中合拢周期,对于提高造船速度,具有重要意义。我们自1972年8月底开始,研究试验了一种支柱式多线型胎架。经模拟试验的结果证明,船体分段中合拢用的模板胎架,是可以用支柱式胎架来代替的。1973年,我们又在模拟试验的基础上,进一步通过实践,制造成功一套支柱式多线型通用胎架。试验工作得到了六机部第十一研究所、复旦大学以及有关兄弟单位的 相似文献
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《船舶与海洋工程学报》2014,(2)
正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors. 相似文献
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《船舶与海洋工程学报》2014,(4)
正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划:时间不限的精密预案计划生成作战计划、方案计划或职能计划;时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础,加速应付危机的能力。 相似文献
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In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama?
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form. 相似文献
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桥梁防撞设施物理模型试验 总被引:1,自引:0,他引:1
物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。 相似文献
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印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues. 相似文献