海水管道控制阀中与旁路阀门相关的挑战（英文）

Modern processing plants use a variety of control loop networks to deliver a finished product to the market. Such control loops,like control valves, are designed to keep process variables such as pressure, temperature, speed, flow, etc. within the appropriate operating range and to ensure a quality product is produced. All control valves have a bypass so that production can proceed if maintenance is needed for the control valve as part of the control loop. The important point is that in both operation and maintenance situations, the bypass valve and the control valve should have approximately the same flow capacity to provide nearly the same amount of pressure. This paper presents a case study in seawater service on the selection of manual bypass valves for a 16″ control valve in class 150 and titanium material. A 16″ butterfly valve of class 150 was chosen for the control valve bypass, which provided a much higher flow capacity than the control valve. In this paper, four solutions are recommended to achieve the same coefficient value(Cv) for the control and bypass valve. Using the reduced size butterfly valve could be the cheapest and best solution. On the other hand, selecting the same control valve for bypass line is the most expensive but maybe the most reliable solution. Using a flow orifice for throttling could be ranked as the second expensive option and the second reliable one. Selection of butterfly valve for throttling is the second cheapest option, but it has the least reliability. Different parameters such as space and weight saving, cost as well as reliability have been considered in evaluation of different solutions.     

Maersk's Strategy in Asia-Europe Route

Recently, the world's biggest container shipping company Maersk has taken frequent actions, such as signing with DSME the contract of 20 3E container ships, which is the biggest, most efficient and environmentally ship globally up to now. Soon after that, Maersk shocked the industry once again by launching a new service named Daily Maersk. Will Maersk's actions lead to self-destruction or other plans?     

COSCO SHIPYARD GROUP ——The “Flattop” in Chinese shiprepair industry

Under the flag of shipping giant:COSCO Group, COSCO shipyard is the largest group for ship repair andconversion in china. COSCO SHIPYARDGROUP has 3 advanced subsidiary companies and other 10 voyage repair compa-nies as well as specialized service compa-nies strategically located in the most important sites along China‘s coast line. The     

127 high quality domestic ships are awarded“CSAD”class

As we all know, China's domestic shipping has been on a low level for a long time. In 2004, in order to improve Chinese shipping level and build up a high quality do- mestic shipping fleet, CCS launched its classification service for domestic ships. In Au…     

Dynamic anti-plane characteristic on an infinite piezoelectric medium with a movable rigid cylindrical inclusion

1 INTRODUCTIONDue to their intrinsic electro-mechanical couplingbehavior, piezoelectric materials have recently beenwidely used as actuators and sensors in smart materialsand structures technology. When subjected to mechani-cal and electrical loads in service, these piezoelectricmaterials can fail prematurely due to their electro-me-chanical coupling behavior. The studies about the fail-ure caused by stress concentration in piezoelectric ma-terials have attracted significant attentions. P…     

基于边界元和爆震分析韩国天安舰水下爆炸事件(英文)

On March 26,2010 an underwater explosion(UWE)led to the sinking of the ROKS Cheonan.The official Multinational Civilian-Military Joint Investigation Group(MCMJIG)report concluded that the cause of the underwater explosion was a 250 kg net explosive weight(NEW)detonation at a depth of 6 9 m from a DPRK"CHT-02D"torpedo.Kim and Gitterman(2012a)determined the NEW and seismic magnitude as 136 kg at a depth of approximately 8m and 2.04,respectively using basic hydrodynamics based on theoretical and experimental methods as well as spectral analysis and seismic methods.The purpose of this study was to clarify the cause of the UWE via more detailed methods using bubble dynamics and simulation of propellers as well as forensic seismology.Regarding the observed bubble pulse period of 0.990 s,0.976 s and 1.030 s were found in case of a 136NEW at a detonation depth of 8 m using the boundary element method(BEM)and 3D bubble shape simulations derived for a 136kg NEW detonation at a depth of 8 m approximately 5 m portside from the hull centerline.Here we show through analytical equations,models and 3D bubble shape simulations that the most probable cause of this underwater explosion was a 136 kg NEW detonation at a depth of 8m attributable to a ROK littoral"land control"mine(LCM).     

船用固体氧化物燃料电池与二冲程低速双燃料发动机集成动力系统的设计与优化（英文）

A combined system including a solid oxide fuel cell(SOFC) and an internal combustion engine(ICE) is proposed in this paper. First, a 0-D model of SOFC and a 1-D model of ICE are built as agent models. Second, parameter analysis of the system is conducted based on SOFC and ICE models. Results show that the number of cells, current density, and fuel utilization can influence SOFC and ICE. Moreover, a deep neural network is applied as a data-driven model to conduct optimized calculations efficientl...     

Knowledge-based System Prototype in Structural Component Design Based on FM

A knowledge-based system in structural component design based on fracture mechanics is developed in this paper. The system consists of several functional parts; a general inference engine, a set of knowledge bases and data-bases, an interpretation engine, a bases administration system and the interface. It can simulate a human expert to make analysis and design scheme mainly for four kinds of typical structural components widely used in shipbuilding industry: pressure vessels, huge rotation constructions , pump-rod and welded structures. It is an open system which may be broadened and perfected to cover a wider range of engineering application through the modification and enlargement of knowledge bases and data-bases. It has a natural and friendly interface that may be easily operated. An on-line help service is also provided.     

Finite element simplified fatigue analysis method for a non-tubular joint of an offshore jacket platform

This paper proposes the finite element simplified fatigue analysis method for fatigue evaluation of the composite non-tubular joint structure of an offshore jacket subjected to wave loads. The skirt pile sleeve of the offshore jacket, which had been in service, was taken as an example of the non-tubular joint structure. SACS software was used for global analysis of multi-directional wave loads for the jacket platform, and ALGOR software was used to build a finite element model, perform finite element analysis, post-process stress results for acquiring the stress range, and perform fatigue evaluation. The analysis results indicate that the extreme stress range is within the allowable stress range and meets the requirements of DNV code. That means the simplified fatigue analysis method is effective and can be used in fatigue design for the non-tubular joint structure of an offshore jacket.     

Design optimization of a torpedo shell structure

An optimized methodology to design a more robust torpedo shell is proposed. The method has taken into account reliability requirements and controllable and uncontrollable factors such as geometry, load, material properties, manufacturing processes, installation, etc. as well as human and environmental factors. The result is a more realistic shell design. Our reliability optimization design model was developed based on sensitivity analysis. Details of the design model are given in this paper. An example of a torpedo shell design based on this model is given and demonstrates that the method produces designs that are more effective and reliable than traditional torpedo shell designs. This method can be used for other torpedo system designs.     

The use of hydrogen as a fuel for inland waterway units

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is. discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

Fully nonlinear simulation for fluid/structure impact: A review

This paper presents a review of the work on fluid/structure impact based on inviscid and imcompressible liquid and irrotational flow. The focus is on the velocity potential theory together with boundary element method （BEM）. Fully nonlinear boundary conditions are imposed on the unknown free surface and the wetted surface of the moving body. The review includes （1） vertical and oblique water entry of a body at constant or a prescribed varying speed, as well as free fall motion, （2） liquid droplets or column impact as well as wave impact on a body, （3） similarity solution of an expanding body. It covers two dimensional （2D）, axisymmetric and three dimensional （3D） cases. Key techniques used in the numerical simulation are outlined, including mesh generation on the multivalued free surface, the stretched coordinate system for expanding domain, the auxiliary function method for decoupling the mutual dependence of the pressure and the body motion, and treatment for the jet or the thin liquid film developed during impact.     

ZHOUZHUANG,A “TOWN IN LAKES”

Zhouzhuang Town is located in the southwestern part of Kunshan City, neighboring Wujiang City, Suzhou City and Qingpu District of Shanghai City, and surrounded by Cheng Lake, Changbai Luke, Dianshaa Lakem Baiyi Lake and South Lake, as known as a "town in …     

Design of underwater robot lines based on a hybrid automatic optimization strategy

In this paper, a hybrid automatic optimization strategy is proposed for the design of underwater robot lines. Isight is introduced as an integration platform. The construction of this platform is based on the user programming and several commercial software including UG6.0, GAMBIT2.4.6 and FLUENT12.0. An intelligent parameter optimization method, the particle swarm optimization, is incorporated into the platform. To verify the strategy proposed, a simulation is conducted on the underwater robot model 5470, which originates from the DTRC SUBOFF project. With the automatic optimization platform, the minimal resistance is taken as the optimization goal;the wet surface area as the constraint condition; the length of the fore-body, maximum body radius and after-body＇s minimum radius as the design variables. With the CFD calculation, the RANS equations and the standard turbulence model are used for direct numerical simulation. By analyses of the simulation results, it is concluded that the platform is of high efficiency and feasibility. Through the platform, a variety of schemes for the design of the lines are generated and the optimal solution is achieved. The combination of the intelligent optimization algorithm and the numerical simulation ensures a global optimal solution and improves the efficiency of the searching solutions.     

2005FIGURES OF WORLD SHIPPING （CHINA）SUMMIT年会人物：ZHOUZHUANG , A ＂TOWN IN LAKES＂

Zhouzhuang Town is located in the southwestern part of Kunshan City, neighboring Wujiang City, Suzhou City and Qingpu District of Shanghai City, and surrounded by Cheng Lake, Changbai Lake, Dianshan Lake, Baiyi Lake and South Lake, as known as a ＂town in lakes＂.     

某散货船单桨、双桨推进系统燃油消耗分析（英文）

This paper presents a comparative analysis between single and twin-screw propulsion systems of a bulk carrier to evaluate the ship and propeller performance in terms of fuel consumption as well as to discuss the cavitation and noise criteria. An optimization model is developed to select the optimum propeller geometry and operational point along the engine load diagram for the selected engines of each case. The engines are selected from the same series due to the same behaviour along the engine l...     

An analysis on China''''s Economic Development Trend in the Next Two Decades

1. China is a participant in as well as a promoter for economic globalization. China has already declared its participation in investment and trade liberalization. It indicates that we have chosen the strategy of participating in economic globalization. China's choice brings     

中国集装箱化的发展

(continued from V ol.171.P .16)C hapter F ourC ontainer P ort Service D evelopm entIn recent years,C hina's container ports have experienceda significant expansion both throughput and capacity.4.1 The role of ports in the transport systemBeing an interface linking sea and inland transportation,aport is services as a base for logistics, inform ation trans-fer and international trade, and as a springboard for theeconom ic developm ent of the hinterland.To carry out thesefunctions adequately,…     

Sensitivity analysis and dynamic modification of modal parameter in mechanical transmission system

Sensitivity analysis is one of the effective methods in the dynamic modification. The sensitivity of the modal parameters such as the natural frequencies and mode shapes in undamped free vibration of mechanical transmission system is analyzed in this paper. In particular,the sensitivities of the modal parameters to physical parameters of shaft system such as the inertia and stiffness are given. A calculation formula for dynamic modification is presented based on the analysis of modal parameter. With a mechanical transmission system as an example, the sensitivities of natural frequencies and modes shape are calculated and analyzed. Furthermore, the dynamic modification is also carried out and a good result is obtained.     

2005FIGURES OF WORLD SHIPPING （CHINA）SUMMIT年会人物：MITSUI 0.S.K. LINES,EXCELLENT AND RESILIENT COMPANY

Personal history I began my career with Mitsui O.S.K. Lines （MOL） upon graduation from Kyoto University in 1967. During my 38year career at the company, I have been involved in a broad range of maritime activities, and have witnessed dramatic changes in the industry as it has sought to meet the changing needs of societies and the globalization of economies. Key events in my career include a posting to Mitsui O.S.K. Lines＇ San Francisco Representative Office from 1975 to 1979;becoming a staff officer of the Planning Division in 1987, followed by a promotion to Deputy General Manager of the Division in 1988; appointment as General Manager of Europe and Oceania Division in 1993; being elected to a directorship in 1996; promotion to Managing Director in 1998, Senior Managing Director in 2000, Deputy President in 2003, and finally President in 2004. For me, the shipping industry is both a business and a passion. I am extremely excited about the changes and challenges that lie ahead for the industry as we begin the 21^st Century, and consider myself to be in a most enviable position leading Mitsui O.S.K. Lines, a company at the vanguard of shipping developments, in these exhilarating times.