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Research on Automatic Positioning Control System of Riprap Barge

Journal of Physics: Conference Series 2021年第1期1939卷

作者： Xiaotao Hua Yan Liu HaiYang Sun CCCC Second Harbor Engineering Company Ltd Wuhan Hubei China Key Laboratory of Large-span Bridge Construction Technology Wuhan Hubei China Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure Wuhan Hubei China CCCC Highway Bridge National Engineering Research Centre Co. Ltd Wuhan Hubei China Huazhong University of Science and Technology School of Naval Architecture and Ocean Engineering Wuhan Hubei China

Based on the research of ship automatic positioning technology and deviation correction technology, combined with the gravel laying technology of single ridge subgrade bed of immersed tunnel, the control strategy of riprap barge is determined: ship automatic positioning technology based on tension control and rope length control. Combined with the gravel laying technology of single ridge subgrade bed and the control strategy of riprap barge, the algorithm of automatic positioning and moving of riprap barge is studied. Combined with the engineering practice, control strategy and control algorithm, the intelligent anchoring positioning control system is designed to realize the high-precision and fast intelligent displacement of gravel bed laying ship.

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Numerical prediction of cavitation performance for rim driven thruster 28

Numerical prediction of cavitation performance for rim drive...

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28th International ocean and Polar engineering Conference, ISOPE 2018

作者： Zhang, Li-Wei Li, Zi-Ru He, Wei Zhu, Ling-Yu Key Laboratory of High Performance Ship Technology Ministry of Education Wuhan University of Technology Wuhan Hubei China Departments of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology Wuhan Hubei China

ISBN: (纸本)9781880653876

The open-water characteristics and cavitation behavior of a rim-driven thruster (RDT) are examined by using the Reynolds-averaged Navier-Stokes (RANS) method with the two-equation turbulence models. The cavitation behavior of the RDT with a cavitation number of σn =3.0 in uniform and non-uniform flow are then separately explored by using the tow-phase RANS method and the Schnerr-Sauer cavitation model, as well as the sliding mesh technique. It can be observed that a sheet cavitation occurs on the suction side of the blades and kind of cloudy structures are captured to be shed from the sheet cavity in the uniform flow. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Cavitation

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Finite element analysis of photovoltaic floating body based on design wave method 28

Finite element analysis of photovoltaic floating body based ...

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28th International ocean and Polar engineering Conference, ISOPE 2018

作者： Li, Wei Zhou, Li-Lan Gan, Jin Wu, Wei-Guo Key Laboratory of High Performance Ship Technology of Ministry of Education Wuhan University of Technology Wuhan Hubei China Department of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology Wuhan Hubei China

ISBN: (纸本)9781880653876

In recent years, surface photovoltaic power generation has attracted more and more attention by the new energy industry. Compared with onshore photovoltaic power generation, the water surface photovoltaic power generation system has more advantages. It is more efficient, it can save land use. The water surface photovoltaic power generation system consists of two parts. One is the floating body which is the support basis of water surface photovoltaic power generation system;another is the photovoltaic panel that is installed on the floating body. The performance of the floating body is directly related to the structural strength and service efficiency of the whole photovoltaic power generation system. Therefore, it is significant to study the hydrodynamic performance and structural strength of water surface photovoltaic floating body. In order to accurately evaluate the wave loads and structural responses of the water surface photovoltaic floating body, one kind of it that will be used in inland waters is selected as the research object in this paper. First, the hydrodynamic performance of the floating body is analyzed by software ANSYS/AQWA that is based on 3-D potential theory. Then the design wave parameters are determined and the wave loads of the water surface photovoltaic floating body under various working conditions are predicted by the design wave method. Finally, the finite element calculation of the surface photovoltaic floating body is carried out. The results show that the overall strength of the photovoltaic floating body meets the yield strength of the material and conforms with the requirements. The results obtained in this paper can be used as reference for the model test of floating bodies and the further design of water surface photovoltaic floating body in restricted waters. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Finite element method

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Numerical simulation of fluid-structure interaction of anisotropic composite propeller 28

Numerical simulation of fluid-structure interaction of aniso...

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28th International ocean and Polar engineering Conference, ISOPE 2018

作者： He, Peng-Peng Li, Zi-Ru He, Wei Zhu, Ling-Yu Key Laboratory of High Performance Ship Technology Ministry of Education Wuhan University of Technology Wuhan Hubei China Departments of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology Wuhan Hubei China

ISBN: (纸本)9781880653876

The two-way transient fluid-structure interaction of the composite propeller has been explored in the time-domain by the Reynolds-averaged Navier-stokes (RANS) Solver coupling with the ANSYS Composite PrepPost (ACP) module based on the Workbench platform. The grid dependency is firstly investigated for both of the structure field and the flow field. Then, the hydrodynamic performance and the structural characteristics of the anisotropic composite propeller DTMB4381 are calculated with consideration of the fluid-structure interaction in the uniform flow field. It is found that the composite propeller has more scattered stress distribution and greater deformation than the metal propeller. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Fluid structure interaction

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Free vibration analysis of submerged finite elliptic cylindrical shell with ring stiffeners 27

Free vibration analysis of submerged finite elliptic cylindr...

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27th International ocean and Polar engineering Conference, ISOPE 2017

作者： Fang, Min Zhu, Xiang Li, Tianyun Jin, Chaochao School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan Hubei Province China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan Hubei Province China

ISBN: (纸本)9781880653975

Free vibration of submerged finite elliptic cylindrical shell with ring stiffeners are examined with an analytical method. Stiffeners are averaged over the thin-walled isotropic elliptic cylindrical shell. The fluid sound pressure is described by the Helmholtz Equation. The ellipticity makes the difference between the symmetric and antisymmetric modal frequencies of the shell. The stiffeners have a greater influence on the vibration at relatively higher order circumferential modal parameters. The circumferential modal parameters corresponding to the fundamental frequency is affected by the ellipticity, shell length, stiffeners interval and depth. Copyright © 2017 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Fourier series

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Free vibration of an elastically restrained circular plate coupled with fluid 46

Free vibration of an elastically restrained circular plate c...

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46th International Congress and Exposition on Noise Control engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017

作者： Yao, Shihui Chen, Meixia Xie, Kun School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology China Hubei Key Laboratory of NavalArchitecture and Ocean Engineering Hydrodynamics China

This paper presents an analytical method for the hydroelastic vibration of an elastically restrained circular plate in contact with bounded fluid. The fluid is inviscid and incompressible while the circular plate satisfies Kirchhoff's thin plate theory. The plate displacements are expanded in series of mode shapes of the same plate in vacuo, and the fluid motion is described by velocity potential function, which satisfies the fluid boundary conditions and compatibility requirement on the coupled surface. On basis of the equilibrium equation of plate, the eigen value equation of the system is established by using orthogonality of dry mode shapes. The results are in excellent agreement with the ones calculated by finite element method. Furthermore, effects of the spring stiffness and fluid depth on free vibration characteristics of the circular plate are investigated. © 2017 Institute of Noise Control engineering. All rights reserved.

关键词： Vibration analysis

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Forced Vibration of a Finite Cylindrical Shell Submerged in Half-Space Bounded by the Free Surface with the Wave Propagation Approach 46

Forced Vibration of a Finite Cylindrical Shell Submerged in ...

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46th International Congress and Exposition on Noise Control engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017

作者： Wang, Peng Li, Tianyun Zhu, Xiang Guo, Wenjie Chen, Fan School of Naval Architecture and Ocean Engineering Huazhong University of Science & Technology Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China School of Naval Architecture and Ocean Engineering Huazhong University of Science & Technology Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China School of Naval Architecture and Ocean Engineering Huazhong University of Science & Technology Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China School of Naval Architecture and Ocean Engineering Huazhong University of Science & Technology Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China School of Naval Architecture and Ocean Engineering Huazhong University of Science & Technology Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China

An analytical method is put forward for forced vibration of a cylindrical shell submerged inhalf-space bounded by a free surface, and the free surface effect is accounted with the image method. The accuracy of the present method is verified by comparing theoretical results with those from the FEM. Compared with the vibration of cylindrical shell submerged in infinite fluid field, the presence of free surface will make negative contributions to the influence of fluid on structure vibration, and it will result in the increases of resonance frequencies. But the free surface effect will be reduced when the immersion depth of cylindrical shell increases. Finally, it could be neglected if the immersion depth is more than 4 times of shell radius. © 2017 Institute of Noise Control engineering. All Rights Reserved.

关键词： Vibration analysis

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Characteristics of wave amplitude and currents in South China Sea induced by a virtual extreme tsunami

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Journal of hydrodynamics 2017年第3期29卷 377-392页

作者：任智源赵曦王本龙 Frédéric Dias 刘桦 MOE Key Laboratory of Hydrodynamics School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China National Marine Environmental Forecasting Center Beijing 100081China School of Mathematics and Statistics University College DublinDublinIreland

This paper investigates the potential extreme tsunami hazards of the worst case scenario of the magnitude M_w=9.30 in South China Sea（SCS）as the Manila Trench is becoming one of the most hazardous tsunami source *** nonlinear shallow water equations model,the time series of surface elevation,arrival time,spatial distributions of maximum wave amplitude and velocity distribution are *** characteristics of wave and currents are *** numerical results indicate that most of the energy of tsunami wave distributes in central and north part of *** offshore regions around SCS will be influenced significantly by the tsunami currents generated by an earthquake in the Manila subduction *** maximum wave amplitude near Guangdong Province,Hainan Island,and Taiwan Island exceeds 4 m and velocities at the majority of measured locations near coast exceeds 2 m/*** grid with high resolution is used to study the impacts of the tsunami on Hainan Island,Taiwan Island,and Lingding *** regions with high hazard risk due to strong currents are ***,a fast tsunami warning method in SCS is developed and discussed,which can provide tsunami warning information in 5 min.

关键词： Tsunami South China Sea（SCS） worst case scenario wave characteristic fast tsunami warning

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Numerical study of vortex induced motions of spar and semi-submersible platforms at high reynolds numbers 28

Numerical study of vortex induced motions of spar and semi-s...

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28th International ocean and Polar engineering Conference, ISOPE 2018

作者： Sun, L. Ding, Y.F. Zheng, J.T. Zong, Z. Liu, C.F. School of Naval Architecture Engineering State Key Laboratory of Structural Analysis for Industrial Equipment Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Dalian Liaoning China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai China Wuhan NO.2 Ship Design Institute Wuhan Hubei China College of Ocean and Civil Engineering Dalian Ocean University Dalian Liaoning China

ISBN: (纸本)9781880653876

Offshore platforms exerted by long-period flow may experience large vortex induced motion (VIM), which will induce fatigue damage of chains and risers connected. To study this problem, the discrete vortex method (DVM) is employed here. The vortex-induced vibration of two-dimensional elastically-supported cylinder at high Reynolds numbers is computed to verify the DVM model. Furthermore, the VIMs of a low-mass-ratio Spar platform and a simplified semi-submersible platform are both simulated to estimate the hydrodynamic efforts induced by different parameters. Based on the analysis of the characteristics of wakes and motion response, the mechanism of VIM has been partly revealed, and some conclusions have been obtained. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Semisubmersibles

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Vibration analysis of submerged orthogonally stiffened FGM cylindrical shells 46

Vibration analysis of submerged orthogonally stiffened FGM c...

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46th International Congress and Exposition on Noise Control engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017

作者： Han, Yueyang Zhu, Xiang Li, Tianyun Yu, Yunyan School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Shanghai200240 China

In this paper, the vibration characteristics of submerged orthogonally stiffened cylindrical shells made from functionally graded materials (FGMs) are investigated. The shells properties are assumed to vary continuously through the thickness. The vibration behaviors of the FGMcylindrical shells are descried by the Flügge shell theory considering the effects of stiffeners and hydrostatic pressures. The surrounding fluid is considered as an ideal acoustic medium. And the effect of the surrounding fluid is described by means of acoustic wave equation. By using the wave propagation method, the displacements of shell in the three directions are described respectively. The resulting equations are employed to obtain the nature frequencies of the orthogonally stiffened FGM cylindrical shell under different hydrostatic pressures. For solving the equations, the parabolic iterative method is applied. The accuracy of the present method is verified by comparisons with those published results. And the influences of the different parameters on the free vibration characteristics of the shell are discussed in detail. © 2017 Institute of Noise Control engineering. All rights reserved.

关键词： Vibration analysis

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