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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 | Year: 2010

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.


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 | Year: 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.


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) | Year: 2013

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.


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 | Year: 2010

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).


Huang T.,Wuhan University of Technology | Huang T.,Key Laboratory of High Speed Ship Engineering | Wu W.-G.,Wuhan University of Technology | Wu W.-G.,Key Laboratory of High Speed Ship Engineering | And 3 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

A new petalled failure mode was developed based on the failure process and failure mechanism of a truncated cylindroconical projectile oblique penetrating. The formulations for energy-consuming, ballistic limit and residual velocity were deduced. The results from the formulations agreed well with those using FEM analysis.


Huang Y.,Wuhan University of Technology | Huang Y.,Key Laboratory of High Speed Ship Engineering | Wu W.,Wuhan University of Technology | Wu W.,Key Laboratory of High Speed Ship Engineering | And 2 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2010

Ceramic composite armors has a fine anti-bullet property. It can improve the anti-bullet property when the thickness of each layer in the compound target is rationally set. In this paper, the performance of a cylindrical fragment penetrating the steel/ceramic/steel compound target has been simulated by nonlinear dynamic software AUTODYN. The diameter of the cylindrical fragment is 8mm. Failure mechanism of the compound target in the penetration process has been analyzed. Through a series of simulation, the influence of the thickness of the front plate, the ceramic layer and the rear plate on the anti-penetration properties of the compound target has been analyzed. It is found that when the surface density is constant, the change of the thickness of the front plate has little influence on the anti-bullet property of the compound target; while the change of the ceramic layer thickness has larger influence on anti-bullet property of the compound target. As the thickness of the rear plate increases, the anti-bullet property of the compound target increases, while the influence degree of the rear plate is a little less than that of the ceramic layer. When the thickness of the front plate is 1mm and the thickness ratio of the ceramic layer and rear plate of the composite target is 2-4, the setting of the compound target is reasonable. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).


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 | Year: 2013

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.


Zhang K.,Wuhan University of Technology | Chen H.,Wuhan University of Technology | Chen H.,Key Laboratory of High Speed Ship Engineering | Shang L.,Wuhan University of Technology | Shang L.,Institute of Simulation and Control Research Center
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2011

Design evaluation is the main way to determine whether cockpit room is good or not, however, since many factors affect the scheme chosen and they are hazy and incertitude, it is difficult to evaluate precisely. Therefore evaluation of traditional scheme is always subjective intuitionistic without a numeric standard. In this paper an assessment model has been achieved with standard for the assessment.


Xu Z.,Key Laboratory of High Speed Ship Engineering | Xu Z.,Wuhan University of Technology | Cai W.,Key Laboratory of High Speed Ship Engineering | Cai W.,Wuhan University of Technology | And 2 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

In this paper it aims at antique sail boat and selects United States Coast Guard and Lloyd's sail boat stability method as stability verification request for Chinese antique sail boat, based on the analysis of the laws and regulations for sail boat of different countries around the world. Thus, taking the stability lost due to the effect of the wave on ship, instantaneous static balance equation in random regular wave is set up, instantaneous motion parameter of the ship on wave at a certain moment is ascertained as well as intersection coordinate of ship and wave together with the volume of displacement and the location of the center of buoyancy are ascertained. Then based on Froude-Krylov hypothesis righting arm of ship in waves and the rule restoring variation in waves are obtained. Meanwhile, rational collocation of sail and ship type of antique sail boat are supposed by considering the feature of the general arrangement and sail type of sail boat stability calculation data among which the safety is priority. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Peng S.,Wuhan University of Technology | Wu W.,Wuhan University of Technology | Wu W.,Key Laboratory of High Speed Ship Engineering | Sun H.,Wuhan University of Technology | And 2 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2011

Water impact is a highly nonlinear dynamic problem. It can cause severe damage on floating marine structures especially on the trimaran which has large wet-deck. In order to investigate the slamming load distribution and the relationship between the impact velocity and the slamming load, a small scale trimaran model test campaign of water entry from a series of heights is performed based on the similarity theory, and the peak pressure of the main hull, side hull and wet-deck are obtained. Meanwhile, a numerical study on the experiment process is carried out through the nonlinear finite element software MSC.DYTRAN. The results of simulation analysis are compared with the experiment results, and help to determine the relevant parameters used in numerical simulation. The emphasis in the present paper is to put forward a reasonable and effective prediction method of the trimaran slamming loads. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).

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