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舰船生活蒸汽管系泄漏问题时有发生,这是因为蒸汽管温差变化大,热胀冷缩所致,特别是在中小型舰船的木作暗管部分造成病端。尽管目前生活蒸汽系统有被空凋,电取暖、电加热代替的趋势,但在舰船建造和修理中还常会遇到。求新造船厂为进一步提高 相似文献
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目前,反水雷舰船普遍存在甲板面积小,总体布置困难;耐波性差,受海况影响较为明显等不利因素.一般只能装备中小型扫雷具,在中、低海况下进行扫雷作业.要实现高海况和大深度扫雷,就要改变目前反水雷舰船的许多局限性因素.因三体船的诸多优点,采用三体船型设计是反水雷舰船一个很好的选择. 相似文献
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针对传统的远洋舰船运行监控大数据挖掘方法精准度低的情况,本文应用关联规则算法,对远洋舰船运行监控大数据挖掘方法进行设计。为了有效对舰船远行监控大数据挖掘,首先获取监控数据源,将数据存入到数据库中,在此基础上,对远洋舰船运行监控数据预处理,以此生成舰船运行监控大数据挖掘模型,完成了对运行监控大数据的挖掘,实验对比结果表明,本文设计的基于关联规则的远洋舰船运行监控大数据挖掘方法比传统的舰船运行监控大数据挖掘方法精准度高,具有一定的实际应用意义。 相似文献
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舰船消磁控制设备现状和发展趋势 总被引:2,自引:0,他引:2
在简要论述舰船消磁系统控制原理,并综合介绍舰船消磁控制设备现状的基础上,分析了不同舰船适用的最佳消磁控制方式和消磁控制新技术的研究方向。认为潜艇和大型水面舰艇适合选用地磁解算方式,猎扫雷舰适合选用三分量传感器方式,中小型舰船既可选用混合式(可进行摇摆运动抗干扰调整),也可单独选用地磁解算式。消磁控制设备应实现多信号融合、标准化、可扩展、可裁减和控制电源数量可设定等功能,重点加强分布式消磁系统、消磁系统智能监控和闭环消磁控制技术的研究。 相似文献
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《舰船科学技术》2020,(2)
现有的舰船移动网络大数据切片流概率稳定调控方法,存在着调控跨度较大的缺陷,为此提出舰船移动网络大数据切片流概率稳定调控方法。采用GCC编译舰船移动网络大数据中间表示,以此为基础,经过迭代计算完成网络大数据的切片,并得到大数据切片流概率,以切片流概率为依据,构建贝叶斯网络-概率模型,稳定调控大数据切片流概率,实现了舰船移动网络大数据切片流概率的稳定调控。实验结果表明,与现有的舰船移动网络大数据切片流概率稳定调控方法相比,提出的舰船移动网络大数据切片流概率稳定调控方法极大地降低了调控跨度,充分说明提出的舰船移动网络大数据切片流概率稳定调控方法具备更好的调控效果。 相似文献
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滑行艇高速航行时的数值模拟(英文) 总被引:1,自引:0,他引:1
Planing vessels are applied widely in civil and military situations.Due to their high speed,the motion of planning vessels is complex.In order to predict the motion of planning vessels,it is important to analyze the hydrodynamic performance of planning vessels at high speeds.The computational fluid dynamic method(CFD) has been proposed to calculate hydrodynamic performance of planning vessels.However,in most traditional CFD approaches,model tests or empirical formulas are needed to obtain the running attitude of the planing vessels before calculation.This paper presents a new CFD method to calculate hydrodynamic forces of planing vessels.The numerical method was based on Reynolds-Averaged Navier-Stokes(RANS) equations.The volume of fluid(VOF) method and the six-degrees-of-freedom equation were applied.An effective process was introduced to solve the numerical divergence problem in numerical simulation.Compared with experimental results,numerical simulation results indicate that both the running attitude and hydrodynamic performance can be predicted well at high speeds. 相似文献
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基于CATIA二次开发的水下平台静水力计算 总被引:1,自引:1,他引:0
水下平台静力计算包含初稳性计算、潜浮稳性计算、大倾角稳性计算、重量重心统计等,传统潜艇、潜器等水下平台的静力计算具有计算过程繁琐、耗时长、效率低、数据不易更新等问题,导致设计人员大量重复性劳动。本文通过对CATIA软件进行二次开发,在水下平台三维建模基础上,编制静水力和重量重心计算程序,可直接计算、获取静水力要素并实现重量重心的自动统计,达到计算的自动化、程序化和数据的及时更新,提升设计手段,对潜艇、潜器等水下平台设计中控制浮态、稳态具有重要作用,工程应用价值较高。 相似文献
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Cemalettin Öztürk F. Zeynep Sargut M. Arslan Örnek Deniz Türsel Eliiyi 《Maritime Policy and Management》2017,44(7):825-836
Due to economical and/or geographical constraints, most of the time overseas containers cannot be directly shipped to their destinations. These containers visit transhipment ports where they are first unloaded and temporarily stored and then loaded onto smaller vessels (feeders) to be transported to their final destinations. The assignment of these containers to outbound vessels necessitates several factors to be taken into account simultaneously. In this paper, we develop a mathematical model to reflect multiple objectives with priorities and to assign these containers to different vessels at the transit container port terminal. Although we solve a single-objective (with the weighted sum of objectives) mathematical model to optimality, we also propose two heuristic approaches to solve this complex problem for a transit agency. The first heuristic is shipment based and has four variants differing in how the opportunity costs of the assignments are calculated. The second greedy heuristic is trip based, where the goal is to maximise the capacity utilisation of the vessels. The heuristics return very promising solutions in ignorable computational times. We also provide real-life cases and present our conclusions. 相似文献
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Although in the great majority of States, the inspection and certification of vessels are provided as public services, the Classification Societies continue being an essential element in maritime traffic, since the official inspections and certifications generally do not take into consideration certain structural aspects or details of vessels. The starting point is an analysis of the role of the Classification Societies on the global and local scale; a case study in a medium-size port of the European Union, the Port of the Bay of Cadiz, is presented. For the case study, an analysis has been made of 507 vessels between the years 2002 and 2008. From the statistical results, it is concluded that there tends to be a direct relationship between the age of the vessel and its classification by a particular type of Society, both with respect to the profiles of risk and to whether the society is a member of the International Association of Classification Societies. The same occurs with respect to the number of days a vessel is detained as a consequence of the Port State Control (PSC) inspections. Similar relationships between Classification Societies and vessels are observed with respect to the flags States, based on featuring in the Black List of the MoU, and with the subclassification of risks. 相似文献
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船舶进、出闸室(或船厢)速度的商榷 总被引:1,自引:1,他引:0
分析了阻力、允许速度及模型试验与实际运转条件的差异 ,为确定船舶 (队 )进、出闸室 (或船厢 )的速度 ,进行了初步探讨 ,提出依据和建议。 相似文献
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R. H. Burroughs 《Maritime Policy and Management》1984,11(4):269-276
Over the last 13 years the sampled offshore workboat fleet has nearly doubled in size and vessels types have shifted to meet new work requirements. Maritime employment on these vessels may be equivalent to 8% of the world total for vessels over 100 get and is expected to grow. In the United States over the last 34 years the number of new jobs created in this activity approximates the number of jobs lost from the decline of us flag deepsea vessels. Vessels have been, and continue to be, administered primarily by us firms although a substantial broadening of international participation occured with the development of the North Sea and may also occur in the Far East. Expanding offshore development, a function of where remaining petroleum reserve lie, will require technological changes for success in deeper water and/or ice conditions. 相似文献
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建造中船舶抵押权制度对解决现实中船舶建造企业融资贷款担保难的问题有着重要意义。要设置起完善的建造中船舶抵押权制度,必须明白建造中船舶的含义、所有权归属、建造中船舶抵押权的性质及其登记,而这些问题都是特殊而富有争议的问题,国内也少有学者对这一问题进行关注。由于缺少应有的理论成果支持以及现有法律规定的不尽完善,国内实践中也少有能够利用建造中船舶设置抵押来进行融资的。因而,对建造中船舶的含义、所有权归属问题以及抵押权的性质和登记问题进行研究是富有理论和现实意义的。 相似文献
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建造中船舶抵押权相关法律问题探析 总被引:1,自引:0,他引:1
建造中船舶抵押权制度对解决现实中船舶建造企业融资贷款担保难的问题有着重要意义。要设置起完善的建造中船舶抵押权制度,必须明白建造中船舶的含义、所有权归属、建造中船舶抵押权的性质及其登记,而这些问题都是特殊而富有争议的问题,国内也少有学者对这一问题进行关注。由于缺少应有的理论成果支持以及现有法律规定的不尽完善,国内实践中也少有能够利用建造中船舶设置抵押来进行融资的。因而,对建造中船舶的含义、所有权归属问题以及抵押权的性质和登记问题进行研究是富有理论和现实意义的。 相似文献
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我国有数量庞大的渔业船舶,其稳性对船舶安全生产、船型设计开发等方面产生重要影响。本文整理现行渔业船舶稳性衡准要求;分析稳性衡准数的数理实质;进而应用国内外普遍认可的总体设计软件NAPA进行渔业船舶稳性衡准数核算方法研究开发。有助于提高对渔业船舶稳性的认知水平和校核能力,亦可为具备类似衡准要求的其他船型设计研发及稳性校核工具开发提供借鉴。 相似文献