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分析目前中国海船二/三副适任评估中影响评估效果的主要因素,包括评估规范存在不足、评估设备需要完善、试题设置有待改进、评估结果缺少有效反馈等,并从评估规范、评估试题设计、评估设备等方面提出改进措施。 相似文献
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《舰船科学技术》2020,(2)
船舶通信软件的可靠性与多种因素有关,同时具有多种变化特点,当前采用单一方法无法对船舶通信软件的可靠性进行客观、科学评估,导致船舶通信软件的可靠性评估偏差比较大,为了提高船舶通信软件可靠性评估的准确性,设计了基于组合模型的船舶通信软件可靠性评估方法。首先分析船舶通信软件可靠性评估进展,建立船舶通信软件可靠性评估指标,然后采用灰色模型对船舶通信软件可靠性进行评估,并采用多项式神经网络进行船舶通信软件可靠性评估,最后两者的船舶通信软件可靠性评估模型进行科学融合,输出船舶通信软件可靠性评估结果,并进行船舶通信软件可靠性评估仿真分析。组合模型的船舶通信软件可靠性评估正确率要高于单一灰色模型和多项式神经网络的评估正确率,船舶通信软件可靠性评估结果更加客观,为船舶通信软件可靠性研究提供一种新的方法。 相似文献
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雷达抗干扰效能评估是雷达作战效能评估的一个重要环节.论文描述了现有的雷达抗干扰评估方法和准则,并对几种典型的雷达抗干扰评估方法进行了分析和对比,提出了一种新的雷达抗干扰效能评估设想. 相似文献
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新的《中华人民共和国海船船员适任评估规范》颁布实施后,航线设计评估项目的评估内容及要求发生了较大变化。文章着重阐述了在新的评估规范下,航线设计评估试题设计的主要原则、难点及具体的解决方案,并给出了航线设计评估试题实例及其简要说明。 相似文献
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鱼雷武器系统作战效能涉及诸多因素,在建立鱼雷武器系统作战效能评估指标体系的基础上,引入灰色层次分析法,在采用专家评估分析法确定鱼雷武器系统作战效能评估指标权重后,运用灰色评估理论构建了评估模型,并通过实例验证了该模型的可行性。 相似文献
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船舶水动力砰击预报技术综述 总被引:3,自引:0,他引:3
文章对水动力砰击预报技术进行了研究与评估.介绍了水动力砰击现象的描述、定义,对预报方法和理论进行了分类,并讨论了预报技术中的困难与难点.综合叙述了预报方法的理论分析与数值模拟,指出这些预报方法的优点与缺点,并对今后的研究与开发工作给出几点建议. 相似文献
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基于线性和非线性波浪理论,在渤海海域观测的30种海况下,选取了导管架平台易发生疲劳损伤的几个危险节点作为研究对象,并通过确定性的疲劳分析方法对这些节点进行了疲劳寿命评估。结果表明,在选取的3种阻尼条件下,考虑波浪的非线性因素后,疲劳寿命的评估结果均有所增加,为海工结构的疲劳寿命评估提供了参考意见。 相似文献
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安全态势评估作为网络安全态势技术的重要组成部分,对于最终决策的制定起着关键作用。目前关于安全态势评估的研究较为热门,但尚不成熟,其中安全态势预测更处于起步阶段。在对现有网络安全态势评估方法和技术进行调研分析基础上,基于对当前网络安全态势的数据分析,得到量化后的离散数据点,研究得出这些离散数据点在时间轴上具有非线性分布的特点,提出了一种基于HHGA-RBF算法的网络安全态势预测模型,对态势评估输出的数据,采用预测模型对安全态势的发展趋势进行预测。根据网络安全态势的实际特点,对该算法进行了改进,详细讨论了具体的预测算法和执行过程。最后,设计并实现了军用网络安全态势评估软件系统,实现了网络态势预测。 相似文献
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临海港口航道航行环境安全综合评价模型 总被引:4,自引:2,他引:2
对临海港口航道航行环境的研究目前甚少,为了正确评价临海港口航道航行环境的安全状况和程度,根据评价因素选取的原则,并结合临海港口航道航行环境的实际情况,确定了综合评价因素。同时,按照FSA的模式,运用Delphi、AHP、Fuzzy等理论建立了模糊综合评价数学模型,并运用VisualC 6.0和数据库知识,开发了计算机辅助评价系统。该模型和系统在有关临海港口航道进行了验证。结果表明,该模型是正确的、合理的,该系统具有很强的实用性,为港口监督人员、航道管理人员、船舶驾驶人员等提供了科学的决策和参考价值。 相似文献
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Recently, various approaches have been introduced to estimate the response of offshore structures in different sea states by stepwisely intensifying records. In this article, a more practical approach entitled Modified Endurance Wave Analysis (MEWA) considering the random and probabilistic nature of wave loading and utilizing optimal time duration is introduced. Generation procedure of this approach is described based on two practical wave theories: random and constrained new-wave. In addition, assessment of a simplified model representing a typical fixed offshore platform under extreme wave conditions in the Persian Gulf is performed making use of MEWA. A comparative analysis has been also carried out to investigate the accuracy and computational costs of MEWA. The results indicate that MEWA can be a time-saving and also reliable method both in design and assessment of offshore platforms. 相似文献
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Thuong T. Le 《Maritime Policy and Management》1997,24(1):55-71
This article investigates the on-going relocation of freight container production, particularly in the standard dry freight segment, from South Korea and Taiwan to emerging economies (especially China and south-east Asia). It offers an assessment of their competitive positions but goes beyond the conventional focus on comparative cost advantage among nations. Drawing on the wealth of trade, investment, location and strategic management theories, it explores other variables including demand condition, industry structure, foreign direct investments and vertical industry linkages, besides production factor cost. 相似文献
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Risk management modeling and its application in maritime safety 总被引:1,自引:0,他引:1
Quantified risk assessment (QRA) needs mathematicization of risk theory. However, attention has been paid almost exclusively to applications of assessment methods, which has led to neglect of research into fundamental theories, such as the relationships among risk, safety, danger, and so on. In order to solve this problem, as a first step, fundamental theoretical relationships about risk and risk management were analyzed for this paper in the light of mathematics, and then illustrated with some charts. Second, man-machine-environment-management (MMEM) theory was introduced into risk theory to analyze some properties of risk. On the basis of this, a three-dimensional model of risk management was established that includes: a goal dimension; a management dimension; an operation dimension. This goal management operation (GMO) model was explained and then emphasis was laid on the discussion of the risk flowchart (operation dimension), which lays the groundwork for further study of risk management and qualitative and quantitative assessment. Next, the relationship between Formal Safety Assessment (FSA) and Risk Management was researched. This revealed that the FSA method, which the international maritime organization (IMO) is actively spreading, comes from Risk Management theory. Finally, conclusion were made about how to apply this risk management method to concrete fields efficiently and conveniently, as well as areas where further research is required. 相似文献
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简要介绍了中国船舶重工集团公司(CSIS)建立和发展的一种小水线面双体船(SWATH)优化设计工程技术系统.主要包括SWATH船型的概念设计、主尺度与线型优化、有效功率预报、纵向运动稳定性校验及稳定鳍设计、耐波性预报、结构载荷评估、波浪中的船体结构动、静响应分析等有关设计、预报与评估的系统方法.并以一型1500吨级小水线面双体型海洋调查船设计和评估为例对有关设计方法进行了说明和验证,在该船设计中,采用线性和非线性三维水弹性理论来预报载荷与评估在波浪中航行船体的结构安全性,同时在中国船舶科学研究中心(CSSRC)的拖曳水池与耐波性水池中进行了阻力与自航、耐波性与操纵性、波浪载荷等船模拖曳及自航试验.文中还给出了该船有关优化设计及模型试验结果. 相似文献