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Modification Method of Longitudinal Bow Structure for Ice-Strengthened Merchant Ship

Journal of shanghai jiaotong university(Science) 2022年第3期27卷 298-306页

作者：丁仕风周利顾颖杰周亚军 School of Naval Architecture and ocean engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina shanghai Rules and Research Institute China Classification SocietyShanghai 200135China

:Merchant ships,which are quite different from icebreakers,usually require the light ice-strengthened bow under the floe-ice *** to ice-class B,requirements of China Classification Society(CCS),intermediate frames and thick hull plates are necessary for the ice belt area to resist floe-ice ***,due to the limited space,it is not practical to set so many intermediate longitudinals from manufacture point of *** this paper,a modification method is proposed to solve the problem by maintaining the frame spacing and increasing the plate *** aim is to make sure that the bow owns the equivalent ice-bearing capacity with the original frame *** first,a bulk carrier with ice-class B is used for case *** to the requirements of the ice class rule,a designed ice thickness is used to calculate the ice load acting on the bow area due to the impact of ice *** structural models are presented to perform the strength analysis under ice load,including the out-shell plate model and the longitudinal *** results show that increasing the plate thickness is helpful to remove the negative effect induced by enlarging the spacing of the longitudinal.A reasonable curve is presented to modify the bow for the ice-strengthened merchant ship,which shows the relationship between the increase of plate thickness and the spacing of ***,a model test of floe-ice–ship interaction is conducted to measure the dynamic ice load,based on which nonlinear dynamic FE analysis is used to verify the presented plate-thickness–longitudinal spacing *** results show that the proposed method can be used to improve the ice-strengthened bow structure effectively,which provides theoretical foundation to modify the requirement of CCS’s ice class rule.

关键词： ice-strengthening ice load ice model test nonlinear FE method ice class rule

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Multipoint Heave Motion Prediction Method for Ships Based on the PSO-TGCN Model

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China ocean engineering 2023年第6期37卷 1022-1031页

作者： DING Shi-feng MA Qun ZHOU Li HAN Sen DONG Wen-bo School of Naval Architecture and ocean engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

During ship operations,frequent heave movements can pose significant challenges to the overall safety of the ship and completion of cargo *** existing heave compensation systems suffer from issues such as dead zones and control system time lags,which necessitate the development of reasonable prediction models for ship heave *** this paper,a novel model based on a time graph convolutional neural network algorithm and particle swarm optimization algorithm(PSO-TGCN)is proposed for the first time to predict the multipoint heave movements of ships under different sea *** enhance the dataset's suitability for training and reduce interference,various filter algorithms are employed to optimize the *** training process utilizes simulated heave data under different sea conditions and measured heave data from multiple *** results show that the PSO-TGCN model predicts the ship swaying motion in different sea states after 2 s with 84.7%accuracy,while predicting the swaying motion in three different *** performing a comparative study,it was also found that the present method achieves better performance that other popular *** model can provide technical support for intelligent ship control,improve the control accuracy of intelligent ships,and promote the development of intelligent ships.

关键词： ship motion prediction time delay multipoint forecast time-graph convolutional neural network particle swarm optimization

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Wind-wave induced dynamic response analysis for motions and mooring loads of a spar-type offshore floating wind turbine

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Journal of Hydrodynamics 2014年第6期26卷 865-874页

作者：马钰胡志强肖龙飞 state key laboratory of ocean engineering Shanghai Jiao Tong University

Due to the energy crisis and the environmental issues like pollution and global warming, the exploration for renewable and clean energies becomes crucial. The offshore floating wind turbines（OFWTs） draw a great deal of attention recently as a means to exploit the steadier and stronger wind resources available in deep water seas. This paper studies the hydrodynamic characteristics of a spar-type wind turbine known as the OC3-Hywind concept and the dynamic responses of the turbine. Response characteristics of motions and mooring loads of the system under different sea states are evaluated and the effects of the loads induced by the wind and the wave on the system are discussed. The calculations are carried out with the numerical simulation code FAST in the time domain and the frequency analysis is made by using the FFT method. The results and the conclusions from this paper might help better understand the behavior characteristics of the floating wind turbine system under actual ocean environments and provide valuable data in design and engineering practice.

关键词： offshore floating wind turbine wind-and wave-induced response analysis numerical simulation effective RAO

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THE INTERACTIONS BETWEEN WAVE-CURRENTS AND OFFSHORE STRUCTURES WITH CONSIDERATION OF FLUID VISCOSITY

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Acta Mechanica Sinica 1996年第4期12卷 307-322页

作者：万德成刘应中缪国平 shanghai Institute of Applied Mathematics and Mechanics Shanghai UniversityShanghai 200072China Department of Naval Architecture and ocean engineering Shanghai Jiaotong UniversityShanghai 200030China

Study of the how held around the large scale offshore structures under the action of waves and viscous currents is of primary importance for the scouring estimation and protection in the vicinity of the structures. But very little has been known in its mechanism when the viscous effects is taken into consideration. As a part of the efforts to tackle the problem, a numerical model is presented for the simulation of the how held around a fixed vertical truncated circular cylinder subjected to waves and viscous currents based on the depth-averaged Reynolds equations and depth-averaged k-epsilon turbulence model. Finite difference method with a suitable iteration defect correct method and an artificial open boundary condition are adopted in the numerical process. Numerical results presented relate to the interactions of a pure incident viscous current with Reynolds number Re = 10(5), a pure incident regular sinusoidal wave, and the coexisting of viscous current and wave with a circular cylinder, respectively. Flow fields associated with the hydrodynamic coefficients of the fixed cylinder, as well as corresponding free surface profiles and wave amplitudes, are discussed. The present method is found to be relatively straightforward, computationally effective and numerically stable for treating the problem of interactions among waves, viscous currents and bodies.

关键词： interactions among waves viscous currents and bodies depth-averaged Reynolds equations depth-averaged kappa epsilon turbulence model

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A simpliied fatigue assessment method for transverse illet welded joints

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Acta Mechanica Solida Sinica 2017年第2期30卷 198-208页

作者： Wei Shen Renjun Yan Nigel Barltrop Kai Qin Feng He key laboratory of High Performance Ship Technology (Wuhan university of Technology) Ministry of EducationWuhan 430063 China state key laboratory of ocean engineering Shanghai University Tong University Shanghai 200240 China Department of Naval Architecture and Marine engineering University of Strathclyde Glasgow G4OLZ UnitedKingdom

Under the as-welded condition the fatigue crack initiation period was considered nonexistent and Linear Elastic Fracture Mechanics（LEFM） was used to calculate fatigue strength for a range of weld geometries. Fracture mechanics assessment of welded joints requires accurate solutions for stress intensity factor（SIF）. However, the solutions for the SIF of complex welded joints are dificult to determine due to the complicated correction factors. Three methods for SIF prediction are discussed on illet welded specimens containing continuous or semi-elliptical surface cracks, including the traditional correction method Mk, the approximate correction method Kt, and the suggested additional crack size method（ac＋ae）.The new additional crack parameter ae is used to replace the stress concentration effect of weld proile Mk, which simpliies the calculation process. Experimental results are collected to support fatigue strength assessment of the additional crack size method.

关键词： Fillet welded joints Stress intensity factor(SIF) Additional crack size(ae) Fatigue strength

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The Numerical Simulation of a Towing Cylinder Based on Immersed Body Boundary Method

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Journal of shanghai jiaotong university(Science) 2016年第2期21卷 136-142页

作者：钱鹏易宏李英辉 state key laboratory of ocean engineering School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong University

An immersed body boundary method is adopted to track the motions of a towing cylinder, and a homogenous multiphase Eulerian-Eulerian fluid approach is used to capture the free surface. The Reynolds average Navier-Stockes(RANS) solver is applied to all gird nodes to deal with different velocities of the nodes that are in the body boundary, near the boundary and out of the boundary and their effect on the fluid. The towing cylinder resistance at different submerged depths in the tank is presented. The simulation results are compared with the experimental data, and the method is verified and validated. Finally, the hydrodynamic characters of the cylinder are discussed further. The numerical and experimental results show that at high speeds, the deeper the cylinder submerges, the lower resistance it suffers. The resistance coefficient trough is obtained at Froude number in the range of 0.3 < F r < 0.4. These phenomena can provide some suggestions on the small waterplane area twin hull(SWATH) design.

关键词： immersed body boundary method towing cylinder two-phase flow model experiment

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Sources and degradation of organic matter in the surface sediments of the Chukchi Sea:insights from amino acids

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Acta oceanologica Sinica 2023年第11期42卷 9-18页

作者： Weiwei Li Zhongqiao Li Zhuoyi Zhu Alexander Polukhin Youcheng Bai Yang Zhang Futao Fang Haiyan Jin Anatolii S.Astakhov Xuefa Shi Jianfang Chen key laboratory of Marine Ecosystem and Biogechemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China shanghai key laboratory of Polar Life and Environment Sciences School of OceanographyShanghai Jiao Tong UniversityShanghai 200240China key laboratory for Polar Science of Ministry of Natural Resources Polar Research Institute of ChinaShanghai 201209China laboratory of Biohydrochemistry Shirshov Institute of OceanologyRussian Academy of SciencesMoscow 117997Russia state key laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China V.I.Il’ichev Pacific oceanological Institute Far Eastern BranchRussian Academy of SciencesVladivostok 690012Russia key laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China state key laboratory of Satellite ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

In the context of global warming and rapid environment change in the Arctic,the supply of organic matter(OM)has increased significantly and a large amount of OM are buried on the Arctic *** the fate of OM in Arctic shelf sediments is crucial to understanding the global carbon *** a marginal sea of the Arctic ocean,the Chukchi Sea is one of the most critical areas where OM is *** on the surface sediment samples collected during the sixth Chinese National Arctic Research Expedition in the summer of 2014 and the SinoRussian joint Arctic Research Expedition in the summer of 2016,this study takes amino acids(AAs)as the primary tool to explore the source and degradation of OM in the surface sediments of the Chukchi *** study shows that total hydrolyzable amino acid(THAA)concentrations(dry weight)are high,with a mean value of(32.7±15.8)μmol/*** spatial distribution is related to primary productivity,hydrodynamic conditions,sediment properties and other *** source of OM in the surface sediments of the Chukchi Sea is dominated by diatom-dominated marine productivity,with some input from terrestrial ***,as the main source of the D-enantiomer of AA(D-AA),not only have transforming effect on OM,but their cell walls and remnants likewise supply the OM *** on a series of diagenetic indicators,we conclude that the OM in the surface sediments of the Chukchi Sea has undergone extensive degradation[DI(degradation index)=-0.59±0.44],and the degradation degree in the slope is higher than that in the *** study uses AA to explore the sources and degradation of OM in the sediments of the Chukchi Sea,which facilitates our understanding of OM transport and transformation on the Arctic shelf.

关键词： Chukchi Sea amino acids degradation indicator organic matter

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Free-Surface Wave Interaction with a Very Large Floating Structure

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Journal of shanghai jiaotong university(Science) 2014年第6期19卷 728-735页

作者：王迎光 Department of Naval Architecture and ocean engineering School of Naval ArchitectureOcean and Civil Engineering state key laboratory of ocean engineering Shanghai Jiaotong University

The free-surface wave interaction with a pontoon-type very large floating structure(VLFS) is analyzed by utilizing a modal expansion method. The modal expansion method consists of separating the hydrodynamic analysis and the dynamic response analysis of the structure. In the dynamic response analysis of the structure,the deflection of the structure with various edge conditions is decomposed into vibration modes that can be arbitrarily chosen. Free-free beam model, pinned-free beam model and fixed-free beam model are three different types of edge conditions considered in this study. For each of these beam models, the detailed mathematical formulations for calculating the corresponding eigenvalues and eigenmodes have been given, and the mathematical formulations corresponding to the beam models of pinned-free beam and fixed-free beam are novel. For the hydrodynamic analysis of the structure, the boundary value problem(BVP) equations in terms of plate modes have been established, and the BVP equations corresponding to the beam models of pinned-free beam and fixedfree beam are also novel. When these BVP equations are solved numerically, the structure deflections and the wave reflection and transmission coefficients can be obtained. These calculation results point out some findings valuable for engineering design.

关键词： very large floating structure(VLFS) modal expansion method edge conditions boundary value problem(BVP)

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Laser-Derived Interfacial Confinement Enables Planar Growth of 2D SnS_(2) on Graphene for High-Flux Electron/Ion Bridging in Sodium Storage

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Nano-Micro Letters 2022年第6期14卷 65-80页

作者： Xiaosa Xu Fei Xu Xiuhai Zhang Changzhen Qu Jinbo Zhang Yuqian Qiu Rong Zhuang Hongqiang Wang state key laboratory of Solidification Processing Centre for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityShaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072People’s Republic of China

Establishing covalent heterointerfaces with face-to-face contact is promising for advanced energy storage,while challenge remains on how to inhibit the anisotropic growth of nucleated crystals on the ***,faceto-face covalent bridging in-between the 2 D-nanosheets/graphene heterostructure is constructed by intentionally prebonding of laser-manufactured amorphous and metastable nanoparticles on graphene,where the amorphous nanoparticles were designed via the competitive oxidation of Sn-O and Sn-S bonds,and metastable feature was employed to facilitate the formation of the C-S-Sn covalent bonding in-between the *** face-to-face bridging of ultrathin SnS;nanosheets on graphene enables the heterostructure huge covalent coupling area and high loading and thus renders unimpeded electron/ion transfer pathways and indestructible electrode structure,and impressive reversible capacity and rate capability for sodium-ion batteries,which rank among the top in records of the SnS_(2)-based *** work thus provides an alternative of constructing heterostructures with planar interfaces for electrochemical energy storage and even beyond.

关键词： Laser-manufacturing Metastable Interfacial engineering Covalent bridging Na-storage

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Numerical and Experimental Study on Hydrodynamic Performance of A Novel Semi-Submersible Concept

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China ocean engineering 2018年第2期32卷 144-156页

作者： GAO Song TAO Long-bin KOU Yu-feng LU Chao SUN Jiang-long state key laboratory of ocean engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China Department of Naval Architecture and Marine engineering University of StrathclydeGlasgowG11XQUnited Kingdom China Ship Development and Design Center Wuhan 430064China School of Naval Architecture and ocean engineering Huazhong University of Science and TechnologyWuhan 430074China

The Multiple Column Platform(MCP) semi-submersible is a newly proposed concept, which differs from the conventional semi-submersibles, featuring centre column and middle pontoon. It is paramount to ensure its structural reliability and safe operation at sea, and a rigorous investigation is conducted to examine the hydrodynamic and structural performance for the novel structure concept. In this paper, the numerical and experimental studies on the hydrodynamic performance of MCP are performed. Numerical simulations are conducted in both the frequency and time domains based on 3D potential theory. The numerical models are validated by experimental measurements obtained from extensive sets of model tests under both regular wave and irregular wave conditions. Moreover, a comparative study on MCP and two conventional semi-submersibles are carried out using numerical ***, the hydrodynamic characteristics, including hydrodynamic coefficients, natural periods and motion response amplitude operators(RAOs), mooring line tension are fully examined. The present study proves the feasibility of the novel MCP and demonstrates the potential possibility of optimization in the future study.

关键词： multiple column platform(MCP) semi-submersible platform numerical simulation model test response amplitude operators(RAOs)

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