船舶随浪运动稳性仿真计算

本文利用Ｌｉａｐｕｎｏｖ理论，研究了船舶在规则波浪运动的稳性；利用摄动理论，求解出船舶运动响应；并讨论了船舶横摇与垂荡运动频率、最大横摇角和波浪要素对稳性曲线ＧＺ的影响，以及流体动压力对稳性曲线的修正，从而给计算船舶在随浪中的稳性提供了一种方法。     

适用于浅海油田的高速交通艇设计

研究设计了一艘适用于浅海油田的高速交通艇，该艇采用深V线型和在侧斜螺旋浆，设有主动式减摇鳍。实船航行表明该艇具有优良的耐波性。     

船舶压载水中有害生物的管理与控制

对由压载水引起的外来生物污染问题进行了较详细的分析。介绍了目前已经应用或正处于研究中的各种对压载水处理方法 ,探讨了其优越性及发展前景     

Modification of ship hydrodynamic interaction forces and moment by underwater ship geometry

The hydrodynamic interaction forces/moments acting on a moored ship due to the passage of another ship in its proximity is researched by considering the influence of ship form against the idealized approach of the use of parabolic sectional area distribution. Comparisons with experimental results show that the interaction effects are predicted better by inclusion of ship's form.     

三峡水库135m运行阶段永久船闸下引航道泥沙淤积分析

通过实测三峡水库135m运行阶段永久船闸下引航道及口门区泥沙淤积与水沙因子变化,计算分析了下引航道及口门区的淤积量及分布、拦门沙淤积形态、淤积机理及清淤时机,建立了口门含沙量与长江含沙量、口门斜流流速与长江流量、拦门沙淤积高度与来沙量等关系;并结合倒灌异重流理论,计算验证了下引航道及口门区异重流、环流淤积。结果表明,下引航道及口门区主要集中在主汛期(7~9月)淤积,汛末(10~12月)进行一次清淤即可满足航深要求。     

基于二叉树的散乱点集快速凸包算法

在右壳树和左壳树概念的基础上,提出了基于二叉树的散乱点集快速凸包算法,它在查找每一个凸包顶点的同时,通过去除若干非凸包顶点来迅速、动态地减小散点集的规模,通常情况下能达到线性时间复杂度。算法省却了凸包顶点间连接关系的判断过程,适用于任何复杂的散点分布情况,并且简单,易于实现。     

带有驱动器冗余的欠驱动船舶的自适应容错控制

在本文中,一种非线性自适应控制容错策略的开发使得具有推力器冗余的欠驱动船舶可以遵循预定的路径行驶,尽管存在未知的系统参数以及由波浪、风和洋流引起的环境干扰.在设计和分析中涉及的技术包括使用反步法、参数投影技术和横向函数.结果表明,本文所提出的控制器,参考路径可以用任意小的跟踪误差进行全局跟踪.仿真结果证明了该控制器的有效性.     

我国极地船舶能力分析与发展建议

"冰上丝绸之路"是"一带一路"倡议的有效延伸,维护我国海外利益以及拓展我国大国地位的重要体现,是贯彻落实海洋强国战略实施的重要路径。建设"冰上丝绸之路",开发利用北极航道,迫切需要极地船舶的装备支撑。本文对比分析国内外极地船舶现状,从极地破冰船、科考船、运输船、邮轮、渔船等船型发展角度,评估我国极地船舶总体能力,凝练我国极地船舶的差距与短板,提出满足未来发展需求的建议措施,为我国提升极地活动能力、治理能力与业务能力提供指导。     

A fine-grained perspective on the robustness of global cargo ship transportation networks

The robustness of cargo ship transportation networks is essential to the stability of the world trade system. The current research mainly focuses on the coarse-grained, holistic cargo ship transportation network while ignoring the structural diversity of different sub-networks. In this paper, we evaluate the robustness of the global cargo ship transportation network based on the most recent Automatic Identification System (AIS) data available. First, we subdivide three typical cargo ship transportation networks (i.e., oil tanker, container ship and bulk carrier) from the original cargo ship transportation network. Then, we design statistical indices based on complex network theory and employ four attack strategies, including random attack and three intentional attacks (i.e., degree-based attack, betweenness- based attack and flux-based attack) to evaluate the robustness of the three typical cargo ship transportation networks. Finally, we compare the integrity of the remaining ports of the network when a small proportion of ports lose their function. The results show that 1) compared with the holistic cargo ship transportation network, the fine-grain-based cargo ship transportation networks can fully reflect the pattern and process of global cargo transportation; 2) different cargo ship networks behave heterogeneously in terms of their robustness, with the container network being the weakest and the bulk carrier network being the strongest; and 3) small-scale intentional attacks may have significant influence on the integrity of the container network but a minor impact on the bulk carrier and oil tanker transportation networks. These conclusions can help improve the decision support capabilities in maritime transportation planning and emergency response and facilitate the establishment of a more reliable maritime transportation system.     

船舶的微生物腐蚀与防护技术*

海洋环境中的微生物腐蚀已被公认为是海洋工程金属构筑物的腐蚀破坏的重要形式。航行在海洋中的船舶不仅受到海水腐蚀的影响,各个部件还会受到微生物腐蚀的影响。严重的微生物腐蚀会导致管路阻塞、部件失效和腐蚀穿孔,不仅影响船舶设备正常运行,也严重威胁船舶安全。本文系统分析了船舶微生物腐蚀发生的位点和危害、不同位点的腐蚀微生物群落结构特征、船舶材料的微生物腐蚀以及不同防护技术的适用范围,并在此基础上提出对船舶微生物腐蚀研究工作的建议。