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Liu B.,Wuhan University of Technology | Wu W.,Key Laboratory of High speed Ship Engineering
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)

According to Guidelines for Direct Strength Analysis of Double Side Skin Bulk Carriers, finite element analysis to the cargo holds of 35000 DWT bulk carrier is carried out by using MSC. Nastran. Then, nonlinear finite element analysis is applied to calculate its ultimate strength by using MSC. Marc, getting its actual safety margin. The research can be used as reference for ship structural design method which is combined nonlinear design based on ultimate strength of structure with linear elastic design based on static strength of structure. Source

Yu M.,Wuhan University of Technology | Yu M.,Key Laboratory of High speed Ship Engineering | Hui J.,Harbin Engineering University
International Conference on Signal Processing Proceedings, ICSP

this paper addresses a problem of estimating the additional phase shift between the transducers of the USBL array. The additional phase directly affects phase shift measurements due to the manufacturing technology of the transducer array, especially for the Long-range positioning system. Employing a least-squares method, the additional phase shift is considered to be determined experimentally by rotating the USBL array in an acoustic test tank. The results of the trials show that the proposed method can effectively measure the additional phase shift, and the positioning system can achieve with good accuracy after the calibration. © 2010 IEEE. Source

Peng S.,Wuhan University of Technology | Sun H.,Wuhan University of Technology | Yue J.,Wuhan University of Technology | Wu W.,Wuhan University of Technology | Wu W.,Key Laboratory of High speed Ship Engineering
Advances in Marine Structures - Proceedings of the 3rd International Conference on Marine Structures, MARSTRUCT 2011

In order to investigate slamming load distribution and its relation to the impact velocity, a small scale trimaran model test was performed. During the water entry from a series of heights, the peak pressure of the main hull, side hull and wet-deck were obtained. Based on the model test and the similarity theory, this paper proposed a reasonable and effective prediction method of the trimaran slamming loads. © 2011 Taylor & Francis Group, London. Source

Kong X.-S.,Wuhan University of Technology | Wu W.-G.,Wuhan University of Technology | Wu W.-G.,Key Laboratory of High speed Ship Engineering | Li X.-B.,Wuhan University of Technology | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock

The damage effect of warhead of anti-ship weapon on war-ship structure mainly includes the actions of explosion fragments and shock wave, and between these two aspects, there exists certain correlation. In the paper, the expansion process of warhead under the inner pressure of detonation products was investigated. The velocity of fragments related to the damage strength of case material and characteristic parameters of charge was derived in accordance with the stress criterion of producing case fragments. On these bases, the expression of equivalent net charge which is related to the size of charge was obtained by analysing the radial expansion process of the charge. A calculation example was given and the result was compared with that of the explosion experiment of cylindrical warhead. Source

Cai W.,Key Laboratory of High speed Ship Engineering | Cai W.,Wuhan University of Technology | Chen W.,Wuhan University of Technology | Luo C.,Wuhan University of Technology | And 5 more authors.
Proceedings of the International Offshore and Polar Engineering Conference

By extending LVOF (Li's VOF) to a two-phase model, we present some results for water impact created by the rigid bodies (landslide, cylinder and wedge) and study the effects of an air on water waves in a numerical wave tank. LVOF is a highly efficient Navier-Stokes solver, constructed by a novel VOF finite volume cut-cell approach that incorporates surface tension plus a dynamic subgrid-scale model. Similar to domain decomposition, we evolve the two-phase solution for the water and air in a block-structured domain, according to introduction of the phase indicator function. Importantly, the communication between both phases is accomplished with a single of the ghost-fluid layer by using the jump boundary condition, based on a ghost fluid method (GFM). Additionally, the body moving in the fluid domain is also treated as a fluid, forming a two-phase flow in the particle-fluid domain. Grid refinement studies are performed for test problems involving water impact. We also investigate nonlinear liquid sloshing. Very encouragingly, the results agree with measurements available. It is demonstrated that our results can provide a valuable base for the analysis of water impact by our two-phase LVOF. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE). Source

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