REGULATIONS OF THE PEOPLE'S REPUBLIC OF CHINA GOVERNING REGISTRATION OF SHIPS

Chapter Ⅲ Nationality of Ships Article 15 A shipowner applying for the nationality of a ship shall, in addition to the Certificate of Registration of Ship's Ownership, submit the following docu-ments according to the ship's navigation zone: 1. For ships engaged in international voyages, the valid technical documents of the ship issued by an authorized organization for survey of ships in accordance with the     

Optimization of bow shape for a non ballast water ship

In this research,a commercial CFD code ＂Fluent＂ was applied to optimization of bulbous bow shape for a non ballast water ships（NBS）.The ship was developed at the Laboratory of the authors in Osaka Prefecture University,Japan.At first,accuracy of the CFD code was validated by comparing the CFD results with experimental results at towing tank of Osaka Prefecture University.In the optimizing process,the resistances acting on ships in calm water and in regular head waves were defined as the object function.Following features of bulbous bow shapes were considered as design parameters： volume of bulbous bow,height of its volume center,angle of bow bottom,and length of bulbous bow.When referring to the computed results given by the CFD like resistance,pressure and wave pattern made by ships in calm water and in waves,an optimal bow shape for ships was discovered by comparing the results in the series of bow shapes.In the computation on waves,the ship is in fully captured condition because shorter waves,λ/Lpp 0.6,are assumed.     

CCS:Pioneer for LNG Ship Standard

Although China is relatively late in the trial use of LNG ships,she has become the front runner in the promotion of LNG ships.The launch of China’s first LNG/diesel hybrid pilot inland waterway ship in 2010 became the prelude for the application of LNG as bunker fuel for water transportation.At present,with the speeding up of the layout of LNG stations of energy companies,and the increase of the government’s policy support,there is the trend of fast development of"oil converted to     

Global robust and adaptive output feedback dynamic positioning of surface ships

A constructive method was presented to design a global robust and adaptive output feedback controller for dynamic positioning of surface ships under environmental disturbances induced by waves, wind, and ocean currents. The ship’s parameters were not required to be known. An adaptive observer was first designed to estimate the ship’s velocities and parameters. The ship position measurements were also passed through the adaptive observer to reduce high frequency measurement noise from entering the control system. Using these estimate signals, the control was then designed based on Lyapunov’s direct method to force the ship’s position and orientation to globally asymptotically converge to desired values. Simulation results illustrate the effectiveness of the proposed control system. In conclusion, the paper presented a new method to design an effective control system for dynamic positioning of surface ships.     

Coupled motions of two ships in irregular waves in time domain

A three-dimensional time domain approach is used to study the coupled motions of two ships with forward speed in waves. In this approach, the boundary condition is satisfied on the mean wetted hull surface of the moving bodies and the free surface condition is linearized. The problem is solved by using a transient free-surface Green function source distribution on the submerged hulls. After solving the response amplitude operator, the method of spectral analysis is employed to clearly express the motion energy spectrum and significant amplitude of two ships. For verifying the code, two same circular cylinders at beam wave are selected to calculate coupled motions by comparison with the results obtained by 3D frequency method which has been proved to be efficient for solving such problems.Two Wigley ships of different sizes with the same forward speed are chosen for numerical calculation of the interaction effect, and some useful suggestions are obtained for underway replenishment at sea.     

中国视窗(英文)

Pollution prevention regulations of Chi- nese ships due to take effect in July 2007The Regulations on Management of Safe Operation and Pollution Prevention re- cently promulgated by China MSA stipu- lates that the third stage ships must ob- tain safety ma…     

Build up quality ships on “double trust”

Reporter: The "double trust" action launched by China MSA is regarded by the shipping industry as a continuation and extension of the "safety and trust ships" initiative. Then what is the original intention of the action?Yang:For many years, the overall c…     

Window to China

Ten Famous Ships are nominated and awardedin China for the first time The outcome of selecting ten famous ships wasannounced in China for the first time on 23rdMarch 2006. The ten ships that won the gloryinclude: China’s first self-designed and con-struc…     

Research on a multi-grid model for passenger evacuation in ships

In order to enhance the authenticity and accuracy of passenger evacuation simulation in ships, a new multi-grid model was proposed on the basis of a traditional cellular automata model. In the new model finer lattices were used, interaction of force among pedestrians or between pedestrians and constructions was considered, and static floor fields in a multi-level exit environment were simplified into cabin and exit static floor fields. Compared with the traditional cellular automata model, the multi-grid model enhanced the continuity of the passengers’track and the precision of the boundary qualifications. The functions of the dislocation distribution of passengers as well as partial overlap of tracks due to congestion were realized. Furthermore, taking the typical cabin environment as an example, the two models were used to analyze passenger evacuation under the same conditions. It was found that the laws of passenger evacuation simulated by the two models are similar, while the simulation’s authenticity and accuracy are enhanced by the multi-grid model.     

基于内聚力单元法的船舶与重叠冰碰撞数值模拟研究（英文）

The gradual increase in shipping and drilling activities in the Arctic regions has resulted in the increased importance of studying the structural safety of polar ships in various ice conditions. Rafted ice refers to a type of accumulated and overlapped sea ice; it is driven by external forces, such as wind and waves, and may exert high loads on ships and threaten their structural safety. Therefore, the properties of rafted ice and the construction of numerical models should be studied before ex...     

Large marine crankshaft offers China a step forward to shipbuilding power

Shipbuilding industry is known as the top of all industries. The world No.1 shipbuilding country has been the long-cherished wish for China. With the continuous increase of economic and technical strengths, China's dream of becoming the world No.1 shipbuilding country seems to come close. However, crank-shaft as the heart of engine which is the heart of large-size ships often makes us in the state of embarrassment. Now, after some twists and turns, in terms of large marine crankshaft, China has broken through the technology barriers set by foreign crankshaft manufacturers and can make our own heart for large-size ships. Though domes-tically produced crankshafts can't meet our demands at the moment, it will give our people more imaginations be-cause Chinese shipbuilding industry has now had the strengths to gallop the world.     

Multi-objective optimization study on dimensions of medium-sized cruise ship in concept phase北大核心CSCD

［Objective］Aiming at the problem of too many influencing factors and too little reference data for determining the dimensions of medium-sized cruise ships in the concept phase, a simplified multi-objective optimization method based on the fitting of dimensions and performance is proposed. ［Method］First, the dimension relations of medium-sized cruise ships are analyzed and the influence of the latest SOLAS requirements used to determine the optimization range. Second, the influence of cruise ship dimensions on space, resistance, stability and seakeeping are analyzed. Next, based on the principles of genetic algorithms, a multiobjective optimization algorithm with high robustness and high engineering adaptability is determined to establish a multi-objective optimization model for the concept design of medium-sized cruise ships. Finally, the Pareto solution obtained by multi-objective optimization is analyzed to provide initial references for determining the dimensions of the target cruise ship. ［Results］Implemented via a genetic algorithm, the optimization program proposed herein is applied in the concept design of a medium-sized cruise ship in order to optimize the initial dimensions, thereby achieving the expected outcome of providing reasonable initial dimensions for cruise ship design. ［Conclusion ］ The proposed simplified multi-objective optimization model can provide feasible initial dimensions for medium-sized cruise ships in the concept phase. As the Pareto solution obtained by multi-objective optimization has different focuses such as resistance and stability, the most suitable solution needs to be selected according to the design object. © 2023 Chinese Journal of Ship Research. All rights reserved.     

The Shock Wave of EU Ship Recycling Regulation

At present,the latest ship recycling regulation proposed by European Commission declares that stricter provisions will be implemented for the dismantling of ships.Recently,the consideration process of the ship recycling regulation of European Parliament is full of "ups and downs".Behind the constant update and adjustment of the regulation is the interest game of various parties,and meanwhile it affects many sensitive nerves that becomes "high priority" and is followed closely by the industry.     

Eradication of algae in ships＇ ballast water by electrolyzing

In order to verify the effectiveness of electrolytic treatment on ships＇ ballast water, experiments are carried out by a pilot system in laboratory. The raw seawater and seawater with different concentrations of different algae are simulated as ships＇ ballast water. The algae in the raw seawater can be killed if it is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L. If the seawater with one kind of algae （Nitzschia closterum, Dicrateria spp., or Pyramidomonnas sp.105cells/mL） is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L the alga can be sterilized, If the seawater with one kind of algae （Dunaliella sp., Platymonas or Chlorella spp.） is directly treated by electrolyzing with an initial residual chlorine concentration of 4 mg/L, the instant mortality changes with the concentration of different algae. However, after 72 hours, in all treated samples, there are no live algal cells found.     

Research on probability distribution of port cargo throughput

In order to more accurately examine developing trends in gross cargo throughput, we have modeled the probability distribution of cargo throughput. Gross cargo throughput is determined by the time spent by cargo ships in the port and the operating efficiency of handling equipment. Gross cargo throughput is the sum of all compound variables determining each aspect of cargo throughput for every cargo ship arriving at the port. Probability distribution was determined using the Wald equation. The results show that the variability of gross cargo throughput primarily depends on the different times required by different cargo ships arriving at the port. This model overcomes the shortcoming of previous models： inability to accurately determine the probability of a specific value of future gross cargo throughput. Our proposed model of cargo throughput depends on the relationship between time required by a cargo ship arriving at the port and the operational capacity of handling equipment at the port. At the same time, key factors affecting gross cargo throughput are analyzed. In order to test the efficiency of the model, the cargo volume of a port in Shandong Province was used as an example. In the case study the actual results matched our theoretical analysis.     

Fast evaluation of ship-bridge collision force based on nonlinear numerical simulation

The max collision force of ship-bridge collision is one of the most important references for bridge design. By means of nonlinear digital simulation method, the collision forces of the collisions between rigid bridge pier and ship bow were calculated out for four different ships, whose tonnages are 5 000, l0 000,50 000 and 60 000 DWT respectively. Curves of collision force-penetration and absorbed energy-penetration are obtained, and the data of the max loads are then summarized. On the basis of these curves and data, a set of curves describing the relationships between max collision forces and tonnages of the ships are successfully presented, by which the max collision forces of the ships-bridge with different tonnages and in different velocities can be estimated easily and reliably.     

船舶融资:瓶颈与构想

ship financing,though a sensitive subject,is an important factor of many issues,like those involving building Chinese ships abroad or Chinese ship flying foreign flag.Embarrassed by the current financing system in China.Our shipbuilding can't be grow faster.The report analyzes the situation and the problems of the current financing system faced by our shipbuilding industry,and some proposals have also been outlined regarding the solution of the problems.     

基于模拟减少集装箱船待港时间的实用方法(英文)

The main challenge for container ports is the planning required for berthing container ships while docked in port.Growth of containerization is creating problems for ports and container terminals as they reach their capacity limits of various resources which increasingly leads to traffic and port congestion.Good planning and management of container terminal operations reduces waiting time for liner ships.Reducing the waiting time improves the terminal’s productivity and decreases the port difficulties.Two important keys to reducing waiting time with berth allocation are determining suitable access channel depths and increasing the number of berths which in this paper are studied and analyzed as practical solutions.Simulation based analysis is the only way to understand how various resources interact with each other and how they are affected in the berthing time of ships.We used the Enterprise Dynamics software to produce simulation models due to the complexity and nature of the problems.We further present case study for berth allocation simulation of the biggest container terminal in Iran and the optimum access channel depth and the number of berths are obtained from simulation results.The results show a significant reduction in the waiting time for container ships and can be useful for major functions in operations and development of container ship terminals.     

国际海事组织船舶能效提案及其影响综述（英文）

This paper presents a review of the different International Maritime Organization(IMO) initiatives to improve the ship energy efficiency of new and existing ships, which is considered one of the essential tasks to reduce Greenhouse Gas(GHG) in the maritime industry. First, the IMO effort and initiatives and the different indices suggested by the IMO are presented till the last version of the Marine Environment Protection Committee(MEPC), showing the effect of different technologies on reducing t...     

The Limit of Large Vessels

On Feb 21(st),the industry was shocked by the news that AP Moller-Maersk placed an order of 10 container ships of 18,000 TEU with the South Korean ship yards.The order brings the development of large vessels to a new climax and at the same time puts forward a series of research subjects to the industry,such as what is the limit for the development of large vessels,whether ship safety can be guaranteed,and etc.