集装箱货运仿真模型在珠三角港港口投资方案评估(英文)

In the Pearl River Delta (PRD), there is severe competition between container ports, particularly those in Hong Kong, Shenzhen, and Guangzhou, for collecting international maritime container cargo. In addition, the second phase of the Nansha terminal in Guangzhou’s port and the first phase of the Da Chang Bay container terminal in Shenzhen opened last year. Under these circumstances, there is an increasing need to quantitatively measure the impact these infrastructure investments have on regional cargo flows. The analysis should include the effects of container terminal construction, berth deepening, and access road construction. The authors have been developing a model for international cargo simulation (MICS) which can simulate the movement of cargo. The volume of origin-destination (OD) container cargo in the East Asian region was used as an input, in order to evaluate the effects of international freight transportation policies. This paper focuses on the PRD area and, by incorporating a more detailed network, evaluates the impact of several infrastructure investment projects on freight movement.     

一种基于CFD的水动力系数计算新方法(英文)

Applications of computational fluid dynamic (CFD) to the maritime industry continue to grow with the increasing development of computers. Numerical approaches have evolved to a level of accuracy which allows them to be applied for hydrodynamic computations in industry areas. Hydrodynamic tests, especially planar-motion-mechanism (PMM) tests are simulated by CFD software -FLUENT, and all of the corresponding hydrodynamic coefficients are obtained, which satisfy the need of establishing the simulation system to evaluate maneuverability of vehicles during the autonomous underwater vehicle scheme design stage. The established simulation system performed well in tests.     

船舶在规则纵浪中的混沌运动

Parametric resonance can lead to dangerously large rolling motions, endangering the ship, cargo and crew. The QR-factorization method for calculating (LCEs) Lyapunov Characteristic Exponents was introduced; parametric resonance stability of ships in longitudinal waves was then analyzed using LCEs. Then the safe and unsafe regions of target ships were then identified. The results showed that this method can be used to analyze ship stability and to accurately identify safe and unsafe operating conditions for a ship in longitudinal waves.     

水下潜器改进S面控制及控制系统仿真(英文)

S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV). However, it is difficult to adjust their control parameters manually. Choosing the optimum parameters for the controller of a particular AUV is a significant challenge. To automate the process, a modified particle swarm optimization (MPSO) algorithm was proposed. It was based on immune theory, and used a nonlinear regression strategy for inertia weight to optimize AUV control parameters. A semi-physical simulation system for the AUV was developed as a platform to verify the proposed control method, and its structure was considered. The simulation results indicated that the semi-physical simulation platform was helpful, the optimization algorithm has good local and global searching abilities, and the method can be reliably used for an AUV.     

边界任意弹性约束薄板的横向振动(英文)

This paper presents an analytical study on the influence of edge restraining stiffness on the transverse vibrations of rectangular plate structure. An improved Fourier series method was employed to analyze the transverse vibration of plate structure with general elastically restrained boundary conditions. A linear combination of a double Fourier series and eight auxiliary terms was sought as the admissible function of the flexural displacement of the plate, each term being a combination of a polynomial function and a single cosine series expansion. The auxiliary terms were introduced to ensure and improve the smoothness of the original displacement function and its derivatives at the boundaries. Several numerical examples were given to demonstrate the validity and accuracy of the current solution. The influences of translational and rotational stiffness on the natural frequencies and mode shapes of plate were analyzed by numerical results. The results show that the translational stiffness has bigger influence on the natural frequencies than the rotational stiffness. It is generally well known that little change of the rotational stiffness has little influence on the mode shapes of plate. However, the current work shows that a very little change of rotational stiffness value may lead to a large change of the mode shapes of a square plate structure.     

国际海事组织海上安全委员会第87届会议概况

国际海事组织（IMO）海上安全委员会（MSC）第87届会议于2010年5月12日至5月21日在英国伦敦召开,IMO101个成员国、2个联系会员（中国香港和法罗群岛）,2个联合国专门机构（世界气象组织和国际劳工组织）的代表以及46个政府间和非政府间组织的观察员出席了会议。     

全力迎战长江大洪水——长江海事防汛抗灾保安全纪实

<正>7月19日上午0940时,一艘名为"长兴809"的散货船,停泊在长江干线重庆段牛耳沱水域。由于水位上涨过快,水流湍急,该船的缆绳被绷断,逐渐下流,将下方的一艘报废空载驳船"渝甲1015"打流。"长兴     

为服务平安世博筑起一道坚实的“水上长城”——长江海事局世博水上安保工作纪实

<正>精彩世博,这是中国对世界的庄严承诺;平安世博,这是长江海事人对世博的倾心贡献。2010年11月15日,历时260天的长江海事世博水上安保工作画上了圆满的句号。从3月1日开始对入沪船舶实施安全检查至今,长江海事局的水上世博安保     

双体船连接桥结构强度的简化计算

双体船的连接桥结构强度是设计时需要重点考虑的问题,采用全船有限元法来分析计算要耗费大量的时间。将连接桥结构简化为一种梁模型,采用简化解析计算方法来分析其扭转强度和横向强度,并与实船的全船有限元法的对比分析结果表明：简化模型和计算方法是可行的,可应用于双体船初步设计阶段,估算连接桥的结构强度,指导结构设计。