Jiangnan, China
Jiangnan, China

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Cui J.,Jiangnan Shipyard Group Co. | Yang Y.,Dalian University of Technology
Chinese Journal of Electronics | Year: 2016

Radar-absorbing materials (RAM), which effectively reduce the radar cross section of targets, are extensively used in stealth optimization of targets. Graphic electromagnetic computing (GRECO) uses graphic acceleration cards and Z-Buffer techniques to address blanking and non-visibility issues in traditional electronic magnetic algorithms. The traditional GRECO is improved to overcome its inability to precisely extract geometric information on visible surfaces and the dependence of calculation accuracy on screen resolution. An algorithm that can calculate the multiple scattering of metal dihedral-coated RAM is proposed. In addition, the element search method used in traditional dihedral calculation is improved, and calculation time is reduced by a significant margin. After the experimental results were compared, the accuracy of the algorithm is examined. The proposed algorithm, combined with the improved GRECO, can used to analyze the stealth performance of complicated targets coated single- or multi-layered RAM. © 2016 Chinese Institute of Electronics.

Lian Z.,Shanghai Dianji University | Hu K.,Jiangnan Shipyard Group Co. | Jiang Z.,Shanghai JiaoTong University | Zheng D.,Jiangnan Shipyard Group Co.
Proceedings of 2011 International Conference on Computer Science and Network Technology, ICCSNT 2011 | Year: 2011

This article advances a share historical and global best particle swarm optimization algorithm (SGHPSO). In SGHPSO model, particles fully inherit the information of historical and global optimum particles in previous operation, which increases the search efficiency of particles. Ten typical nonlinear functions are given to test the efficiency of the improved algorithm. Simulation results clearly demonstrate superiority of the improved algorithm. © 2011 IEEE.

Fan T.,Shanghai JiaoTong University | Fan T.,Jiangnan Shipyard Group Co. | Xu H.,Shanghai JiaoTong University | Pop I.,Babes - Bolyai University
Applied Mathematics and Mechanics (English Edition) | Year: 2013

The laminar fully developed nanofluid flow and heat transfer in a horizonal channel are investigated. Highly accurate solutions for the temperature and nanoparticle concentration distributions are obtained. The effects of the Brownian motion parameter Nb, the thermophoresis parameter N t, and the Lewis number Le on the temperature and nanoparticle concentration distributions are discussed. The current analysis shows that the nanoparticles can improve the heat transfer characteristics significantly for this flow problem. © 2013 Shanghai University and Springer-Verlag Berlin Heidelberg.

Yan X.-L.,East China University of Science and Technology | Wang X.-W.,East China University of Science and Technology | Lian Z.-G.,Shanghai Dianji University | Lian Z.-G.,Jiangnan Shipyard Group Co.
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2011

A new particle swarm optimization algorithm was proposed to increase the diversity of the shared information. In the process of velocity updating, the historical global best in the previous rounds was combined with the local best in the current round to increase the diversity of information. In addition, according to the different combining ways of two kinds of information, the basic algorithm was extended to 3 kinds of extension algorithm. Simulation results on 6 typical functions showed that the improved particle swarm algorithm can efficiently overcome the premature of standard particle swarm algorithm.

Hu L.,Shanghai JiaoTong University | Huang J.,Shanghai JiaoTong University | Ni H.,Jiangnan Shipyard Group Co. | Wu Y.,Shanghai JiaoTong University
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2011

Laser hybrid welding has become one of the most promising welding methods used to weld ship thickness steel plates with high efficiency due to combining the advantage of laser welding and arc welding. CO2 laser hybrid welding processes of ship steel plates are studied. The influences of the shielding gas composition on the chemical composition of weld and the distance between the laser beam and arc on the stability of the welding process are mainly analyzed. Based on the optimizing process parameters, 10Ni3CrMoV steel plates with a thickness of 14 mm are welded on both sides in T joint form using high-power laser hybrid welding. The welds produced are assessed by X ray. No crack is found and there is only a small amount of pores. The microstructures of welded joints are examined by optical microscope. The results show that the microstructure of welded joints has good comprehensive mechanical properties. Especially after the weld overlap region experiences a re-melting and heat treatment, the microstructure is refined. The microhardness of welded joints is tested in different regions. The maximum hardness of welded joints is less than 360 HV. The welds obtained can meet the technical requirements for shipbuilding industry.

Chen J.,Jiangnan Shipyard Group Co. | Hong T.,Jiangnan Shipyard Group Co. | Li X.,Jiangnan Shipyard Group Co. | Chen B.,Jiangnan Shipyard Group Co.
Ship Building of China | Year: 2015

Vary Large Gas Carrier (VLGC) is internationally recognized as one of the ships which are the most difficult to design and construct. The key point of this case is the design and research for prismatic independent tank of very large gas carrier. This is a very difficult and complex project, not only considering the arrangement and calculation of the prismatic independent of the Very Large Gas Carrier, but also taking into account the factors such as bearing system, hull structure, insulation, liquid system. The article disserts the design process of VLGC prismatic independent tank through tank arrangement, the bearing system, insulation, the calculation of tank temperature, rules check and the direct strength analysis. Jiangnan is the first shipyard in china to achieve the key technology of prismatic independent tank, setting up the foundation of successfully researching and building the first VLGC in China. It not only breaks the monopolization of the foreign shipyard, filling a domestic gap in VLGC building, but also accumulates the previous experience for the shipbuilding industry in China. © 2015, Editorial Office of Ship Building of China. All right reserved.

Hu K.,Jiangnan Shipyard Group Co. | Li X.,Jiangnan Shipyard Group Co.
Ship Building of China | Year: 2014

Research on VLGC has been accomplished, via finding out the key issue of its design and construction, and employing advanced design technique and tools. CFD is used in hull line development and optimization, and then damage stability and general arrangement design is completed. Some specialized tools for temperature distribution analysis and cargo tank strength check are developed to improve design efficiency and quality. The sloshing load on independent tank and function of support system is investigated. In order to ensure the safety of the vessel, a 3D FEM structure analysis, including hull, tank and support, is finished. Cargo handling system and machinery, electrical system on the vessel are researched. As the construction of VLGC is much more difficult than its design, vast amount of construction study is implemented before the contract order. A real scale mock-up has been fabricated to get more know-how of VLGC construction. Series of building contracts have been acquired after the hard work on VLGC design and construction research. ©, 2014, The Editorial Board of Ship Building of China. All right reserved.

Liu M.,Jiangnan Shipyard Group Co. | Liu W.,Jiangnan Shipyard Group Co. | Li X.,Jiangnan Shipyard Group Co. | Liu Y.,Jiangnan Shipyard Group Co.
Ship Building of China | Year: 2015

The shale gas boom in the United States is likely to result in an oversupply of ethane in the short to medium term, which presents the opportunity for large scale exports to Europe and Asia. The increasing demand of ethane transport in global and the economic performance by owners will determine the emergence of the very large ethane carrier (VLEC). This paper analyzes different containment systems which can be used on VLEC, and focuses on the design approach of cargo tanks of the VLEC with type C independent tank. Moreover, designs and calculations of the VLECs of the 81500 m3 one by using dished heads and the 75500 m3 one by using hemispherical heads demonstrated the feasibility of the project design of VLEC with type C independent tank in this paper. ©, 2015, Editorial Office of Shipbuilding of China. All right reserved.

Zheng S.,Jiangnan Shipyard Group Co. | Fu L.,Jiangnan Shipyard Group Co. | Liu W.,Jiangnan Shipyard Group Co. | Lu L.,Jiangnan Shipyard Group Co.
Ship Building of China | Year: 2015

International Maritime Organization (IMO) is formulating second generation intact stability criteria, implemented with multi-layer evaluation methods, to establish minimum standards for ship design. In this paper the new proposal solution of level 1 vulnerability criteria is explained. By using NAPA software the pure loss of stability, parametric roll and surf-riding/broaching criteria are analyzed for full-scale LPG carriers, including very large fully cooled gas carrier and small type C LPG carrier. ©, 2015, The Editorial Office of Shipbuilding of China. All right reserved.

Hu A.K.,Harbin Engineering University | Guo Y.,Harbin Engineering University | Wang W.,Jiangnan Shipyard Group Co. | Jiang W.,Harbin Engineering University
Advanced Materials Research | Year: 2013

For the jack-up platforms' huge size and complex structure, as well as the variation and complexity of their ambient corrosion environment, problems often arise in cathodic protection (CP) systems. The rise of the computer and the numerical simulation technology provide a new technical method to the prediction, evaluation and optimization of CP system for jack-up platform. Numerical simulation method has the advantage of examining potential maps of the entire structure easily and then the designer can determine the number and placement of anodes required to provide protection from the under and over protection regions based on a generic polarization response. In this paper the 3-D boundary element method was used to calculate the mathematical model of sacrificial anode CP system for a jack-up platform. Introduced piecewise quasi linearized method to deal with nonlinear problem of boundary conditions. Adopt block boundary element method to solve electrolyte inconsistency problem and points regional modeling to solve electrolyte discontinuous. From the results we can conclude that the jack-up platform sacrificial anode CP system meets the protection targets. © (2013) Trans Tech Publications, Switzerland.

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