共查询到20条相似文献，搜索用时 31 毫秒
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海洋调查船是了解认知与开发利用海洋的关键基础设施。欧洲海洋调查船运作组织(ERVO)推动这一关键基础设施协同的努力颇具代表性。它面对欧洲海洋调查船多元化且无权威主体的境地,通过会员制构建协同平台,明晰了业务主导、可持续发展的协作目标;它通过年会聚焦海洋调查船及相关仪器装备,交流运行管理,研讨技术创新、改造更新以及与海洋调查船相关的共性话题,以促进欧洲海洋调查船和相关装备具有最佳的运行成效;它与相关海洋调查与研究组织机构联动,跻身于欧洲海洋调查船发展战略层,推动欧洲海洋调查船在项目层面组队共享。文章解析了欧洲海洋调查船运作组织的背景和运作模式,同时针对我国海洋调查船协作多头发力缺乏合纵连横的状况,提议发起中国海洋调查船协同论坛,组建联合工作组做好长期务实的基础性工作,筹划中国及关系国调查船协调计划,以建立我国海洋调查船协同机制并逐步跻身国际海洋调查船战略协同层。 相似文献
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Griffiths Gwyn; Enoch Peter; Millard Nicholas W. 《ICES Journal of Marine Science》2001,58(6):1195-1200
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新型双船起重拆除平台试验研究 总被引：1，自引：1，他引：0
拆除大型海上结构物是一项非常复杂且充满挑战的工程。现提出一种新型海上平台拆除方案,该方案利用三条半潜船来代替具有重型起重装置的单一船舶,通过两艘相同的半潜船将平台上层建筑托起,随后运至第三艘半潜船上完成平台拆除。在风浪流作用下,半潜船和平台的所处方位和运动姿态一直处于动态变化中,这对船舶调节压载的稳定性以及双船运动的同步性提出了要求。为了确保该方案的高效性和安全性,设计了一套完整的模型试验装置,包括船舶模型、平台拆卸辅助设备、六自由度运动采集与分析系统、控制系统、无线通讯系统以及测量系统。开展了相应的水池试验,试验结果验证了双船起重拆除平台方案中双船协同运输这一关键环节的可行性和安全性。 相似文献
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Mohammad Saeed SEIF Ebrahim JAHANBAKHSH Roozbeh PANAHI Mohammad Hossein KARIMI 《海洋工程》2009,(3):517-528
High speed planing hulls have complex hydrodynamic behaviors. The trim angle and drafts are very sensitive to speed and location of the center of gravity. Therefore, motion simulation for such vessels needs a strong coupling between rigid body motions and hydrodynamic analysis. In addition, free surface should be predicted with good accuracy for each time step. In this paper, velocity and pressure fields are coupled by use of the fractional step method. On the basis of integration of the two-phase viscous flow induced stresses over the hull, acting loads (forces and moments) are calculated. With the strategy of boundary-fitted body-attached mesh and calculation of 6-DoF motions in each time step, time history of ship motions including displacements, speeds and accelerations are evaluated. For the demonstration of the software capabilities, circular cylinder slamming is simulated as a simple type of water slamming. Then, a high-speed planing catamaran is investigated in the case of steady forward motion. All of the results are in good concordance with experimental data. The present method can be widely implemented in design as well as in performance prediction of high-speed vessels. 相似文献
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Mohammad Saeed SEIF Ebrahim JAHANBAKHSH Roozbeh PANAHI Mohammad Hossein KARIMI 《中国海洋工程》2009,23(3):517-528
High speed planing hulls have complex hydrodynamic behaviors. The trim angle and drafts are very sensitive to speed and location of the center of gravity. Therefore, motion simulation for such vessels needs a strong coupling between rigid body motions and hydrodynamic analysis. In addition, free surface should be predicted with good accuracy for each time step. In this paper, velocity and pressure fields are coupled by use of the fractional step method. On the basis of integration of the two-phase viscous f... 相似文献
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Investigation of strategies to improve the recycling effectiveness of waste oil from fishing vessels
The marine ecological environment and fishery resources can be severely polluted or destroyed by waste oil from fishing vessels if they are emitted directly into the ocean without any proper pre-treatment process. International conventions such as MARPOL 73/78 regulate waste-oil emissions and require the installation of a waste oil–water separator only for ocean-going ships of over 400 gross tons. Hence, these international conventions are not applicable to most fishing ships due to their low gross tonnages. In addition, space on most fishing vessels is too limited to allow waste-oil storage tanks or a waste oil-water separator to comply with international maritime regulations. Because a significant amount of waste oil is produced by fishing vessels around the world every day, effective strategies or measures are needed to prevent this waste oil from polluting the marine environment. This study thus investigates strategies and measures for improving the effectiveness of waste-oil collection from fishing vessels. This study found that existing procedures for the collection and treatment of waste lubricating oil on land could be applied to the management of waste oil and bilge water from fishing vessels. Sufficient oil–water separators and storage facilities for the collection of waste oil should be placed at each fishing port and shipyard. Fishermen should then be required to deliver their waste oil to these storage facilities, from where it can be transported to legal recycling companies for further treatment. In addition, fishing harbor authorities should bear definitive responsibility for monitoring the illegal dumping of waste oil and for checking the waste-oil record books of fishing vessels. Each maritime country should enforce relevant laws and regulations to reduce the emission of waste oil from fishing vessels into the ocean. 相似文献
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This paper attempts to provide a better understanding of the hydrodynamic behavior of a tandem hull form in a floating production platform application where high deck payload capacity and low wave induced motions of this vessel are primary design goals. A simplified hydrodynamic analysis and a more representative radiation and diffraction theory based hydrodynamic analysis are used for wave induced forces and motions. The analysis results are compared with model test results to deduce principal features of these special purpose hull configurations. The motion responses in different wave headings evaluated from the complicated diffraction analysis are compared and discussed in some detail. 相似文献
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The prediction of ship stability during the early stages of the design process is very important from the point of a vessel's safety. Hence, in this study, a formula is presented to estimate cross curves of fishing vessels to predict initial stability at the preliminary design stage. For this purpose, 175 fishing vessel forms have been generated from Doust trawler hull series. The predictive technique is established by regression analysis of systematically varied fishing vessel series data. The mathematical model is constructed as a function of main design parameters such as length to beam ratio LWL/BWL, beam to draft ratio BWL/T, moulded depth to draft ratio D/T and block coefficient CB. This prediction is also used to determine the effect of specific hull form parameters and load conditions on the stability of the fishing vessel. Some basic considerations on how the proposed method can be applied to a new fishing vessel are presented. 相似文献
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通过主机轴功率的测试判断船体,主机,螺旋桨三者的匹配状况 总被引：3，自引：0，他引：3
渔船主机是渔船的心脏，其技术状况的好坏直接影响到船舶的性能，而船体，主机，螺旋桨三者的匹配情况对船舶的航速，拖力以及经济效率都具有重要的影响。 相似文献
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文昌鱼幼体体腔、血管发育的初步研究 总被引：2，自引：0，他引：2
本文研究了24,48h文昌鱼幼体体腔、血管的发育状况,旨在为研究文昌鱼体腔细胞、粒细胞的起源和分化提供依据。1 材料和方法1.1 实验材料青岛文昌鱼(BranchiostomabelcheriTsingtauense)24,48h幼体。1.2 方法文昌鱼幼体经2.5%戊二醛(0.1mol/L二甲砷酸钠配制,pH7.3)固定1h,1%锇酸固定1h,然后经系列酒精脱水,Epon812包埋。半薄切片(2μm)经碱性美蓝-品红染色[1],光镜观察、照相。半薄切片定位的样品经超薄切片,醋酸双氧铀、柠檬酸铅染色,JEM-100cx电镜观察、照相。2 结果2.1 光镜观察结果青岛文昌鱼卵子在室温条件下自受精后50～60min… 相似文献
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北极航道现状与发展趋势及对策 总被引：1，自引：0，他引：1
相比其他航道,北极航道的行程更短,北极航道的通航具有很高的经济性和商业价值。充分调研北极航道的现状,对当前通航北极的商船类型、路线及沿途的冰区环境进行详细分析,并从北极油气资源开采规划上预测未来商船类型和航线的发展趋势。鉴于我国商船在北极航道面临的风险,提出有效地应对措施,并剖析了我国发展极地救助船的必要性。 相似文献
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船位监控系统（vessel monitoring system,VMS）数据在渔船作业特征挖掘分析方面已有较多应用。本文以粤渔10000/10011双拖渔船2017年8月16日—9月16日的VMS数据为例,详细分析了该双拖渔船的作业状态,研究了航次和网次提取方法,并对捕捞强度的空间分布进行了分析。研究结果表明,粤渔10000/10011有4个航速区间,分别为<1.0 m/s、1.0~1.8 m/s、1.8~2.9 m/s和>2.9 m/s,对应渔船的抛锚和慢速、夜间拖网航速、白天拖网航速和巡航状态;2017年8月16日—9月16日期间,粤渔10000/10011共进行了5个航次19个网次的拖网作业,其捕捞强度空间分布呈现近岸海域高离岸海域低的特征,且夜间拖网主要在离岸海域,白天拖网会转移到水深相对浅的近岸海域。 相似文献
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