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Study on Effectiveness of Solitary-Wave-Like Form Based on Overtopping Data from Irregular Wave Tests

China Ocean engineering 2024年第4期38卷 701-710页

作者： LI Xiao-liang Huang Gui-biao School of Naval Architecture&Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

The previous study conducted by Li(2022)demonstrates that the Goda graph can be adequately represented by a solitary-wave-like form across the entire range of relative water depth,with the exception of the extremely shallow ***,it remains uncertain whether this form is equally effective when applied to test data generated by irregular waves,as the Goda graph was initially developed based on overtopping data from regular wave ***,it is unclear whether this form is suitable for formulating overtopping discharge at composite vertical *** order to address these questions,a 2D overtopping experiment was conducted,incorporating both simple and composite types of vertical walls,with various relative water depths across the entire range,excluding the extremely shallow zone.A novel analysis procedure was developed,which proved to be highly productive and can be considered a general method for data ***,the study yielded two conclusions:(1)the solitary-wave-like form is remarkably effective in formulating overtopping test data generated by irregular waves,regardless of whether the vertical wall is simple or composite,and(2)the resulting formulas exhibit definitely better performance compared with existing formulas.

关键词： solitary-wave-like form overtopping discharge overtopping formula vertical wall

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Preface for the Special Issue on “Advances in Floating Integrated System”

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China Ocean engineering 2024年第6期38卷 915-916页

作者： CHENG Yong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

Oceans contain abundant oil and gas resources,renewable energy,aquaculture resources and space *** marine structures are superior in terms of environmental friendliness,low cost,flexibility and mobility,which provide beneficial support for utilizing ocean spaces and exploiting ocean resources near *** floating structural technologies have been investigated and improved for more than three decades,the construction cost of floating platforms is still very high compared with the cost of conventional fixed *** floating platforms with wind turbines/wave energy converters/tidal power devices/photovoltaic modules can realize cost reduction,multi-functionality,and space ***,the multi-purpose platform is a promising“vaccine”to activate islands’immunity to expensive imported fossil fuel,helping to obtain clean and economical power as well as facilitating seafood export as a secondary income source.

关键词： ocean tidal abundant

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Two-Staged Method for Ice Channel Identification Based on Image Segmentation and Corner Point Regression

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China Ocean engineering 2024年第2期38卷 313-325页

作者： DONG Wen-bo ZHOU Li DING Shi-feng WANG Ai-ming CAI Jin-yan 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

Identification of the ice channel is the basic technology for developing intelligent ships in ice-covered waters,which is important to ensure the safety and economy of *** the Arctic,merchant ships with low ice class often navigate in channels opened up by *** in the ice channel often depends on good maneuverability skills and abundant experience from the captain to a large *** ship may get stuck if steered into ice fields off the *** this circumstance,it is very important to study how to identify the boundary lines of ice channels with a reliable *** this paper,a two-staged ice channel identification method is developed based on image segmentation and corner point *** first stage employs the image segmentation method to extract channel *** the second stage,an intelligent corner regression network is proposed to extract the channel boundary lines from the channel region.A non-intelligent angle-based filtering and clustering method is proposed and compared with corner point regression *** training and evaluation of the segmentation method and corner regression network are carried out on the synthetic and real ice channel *** evaluation results show that the accuracy of the method using the corner point regression network in the second stage is achieved as high as 73.33%on the synthetic ice channel dataset and 70.66%on the real ice channel dataset,and the processing speed can reach up to 14.58frames per second.

关键词： ice channel ship navigation identification image segmentation corner point regression

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Ship longitudinal structural stiffening for navigating turbulent water environment

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International Journal of Vehicle Systems Modelling and Testing 2024年第3期18卷 267-288页

作者： Okello, Moses Oyaro Zhang, Jian Hua, Shi School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212100 China

This paper proposes techniques to enhance the longitudinal strength of cargo ships to ensure minimum stress and deformation during sagging and hogging. The first technique is stern-to-bow, which uses curve support structures to increase the longitudinal strength of a cargo ship. Another technique to stiffen a ship’s lateral plate is the use of different design patterns, such as wavy curves, stars, and zigzags etc., for the side plate stiffening. In addition, structural topology optimisation is used to generate the optimal plate designs with the minimum plate mass. A numerical study on different stiffened plates with fixed supports on both ends subjected to a uniform load distribution shows that there is a decrease in both the total deformation and mass of the plate when the wavy, star, and zigzag pattern plate stiffening is used. Furthermore, curving the plate on top can increase its strength during sagging as well as hogging. Copyright © 2024 Inderscience Enterprises Ltd.

关键词： Topology

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Error Analysis of A New Higher Order Boundary Element Method for A Uniform Flow Passing Cylinders

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China Ocean engineering 2023年第3期37卷 369-377页

作者： SUN Shi-yan CUI Jie BAO Chao-ming School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

A higher order boundary element method(HOBEM)is presented for inviscid flow passing cylinders in bounded or unbounded *** traditional boundary integral equation is established with respect to the velocity potential and its normal *** present work,a new integral equation is derived for the tangential *** boundary is discretized into higher order elements to ensure the continuity of slope at the element *** velocity potential is also expanded with higher order shape functions,in which the unknown coefficients involve the tangential *** expansion then ensures the continuities of the velocity and the slope of the boundary at element *** extensive comparison of the results for the analytical solution of cylinders,it is shown that the present HOBEM is much more accurate than the conventional BEM.

关键词： higher order boundary element method(HOBEM) error analysis integral equations for potential and velocity cylinders

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Analysis of Ship Motion in An Ice Ridge Field Based on Empirical Approach

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China Ocean engineering 2023年第6期37卷 912-922页

作者： SONG Ming YUAN Wei LIU Kun HAN Yue School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The estimation of ship speed in ice ridge fields is important for both route planning and prediction of emergency response *** analytical method for estimating ship motion in first-year ice ridge is developed based on ice resistance models and ship motion equations,in which the effect of ship speed on ridge resistance is taken into *** model tests in level ice and one model test in ice ridge for an icebreaking multipurpose vessel are used to validate and benchmark the presented *** predicted results including level ice resistances,net thrust and ship motion in the ice ridge field are compared with the model test *** comparisons show that the presented method can generate reasonable *** effects of input parameters on ship speed,penetration depth and number of necessary rams to transit ridge have been *** on the calibrated model,insights into the ice resistance and the ship motion are *** is found that the energy consumption of the keel obtained by integral calculation of the keel resistance at the penetration distance is with the same magnitude as the result of the maximum keel resistance multiplied by the ridge *** addition,the effect of ridge width and keel depth on keel resistance and average transit speed is investigated.

关键词： ice ridge ice resistance model tests average transit speed

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Experimental Study on Effect of Inclination Angle on Bubble Collapse near Attached Air Bubble

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China Ocean engineering 2023年第5期37卷 753-767页

作者： WANG Jia-xia WU Shi-zeng LIU Kun JIANG Ming-zuo WANG Zi-li School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Automation Jiangsu University of Science and TechnologyZhenjiangJiangsu 212003China

Experiments were conducted to investigate the dynamics of an oscillating bubble generated by a spark in the presence of an inclined attached air *** study primarily focused on the influence of the inclination angle on the behavior of bubble jetting orientation,air bubble shape modes,and motion characteristics of the interaction between the two *** complex bubble jetting behaviors were observed,including the presence of multiple types of bubble jetting directions,bubble splitting,and multidirectional *** types of air bubble shapes were defined,namely inclined cup cover-shaped(with and without splitting),double-peaked cup cover-shaped,and inclined L-shaped air *** formation of different types of bubble jets was analyzed using the vector synthesis principle of the Bjerknes force exerted by the inclined attached air bubble and a steel *** describe the diverse orientations of bubble jetting and air bubble shapes,new parameters namely the dimensionless spark bubble oscillation time T^(*)and volume ratio V^(*)that consider the inclination angle are *** findings of this investigation contribute to the existing knowledge and have the potential to further enhance methods for mitigating cavitation damage in marine,hydraulic machinery systems,and medical fields.l fields.

关键词： spark-generated bubble experiment inclination angle bubble jet air bubble shape bubble dynamics

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Numerical Study on the Pulsation Characteristics of An Attached Air Bubble Under A Nearby Oscillating Bubble

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China Ocean engineering 2023年第2期37卷 299-311页

作者： JIANG Ming-zuo LIU Kun WANG Jia-xia WEN Xiao-hu College of Automation Jiangsu University of Science and TechnologyZhenjiang 212003China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Numerical simulations of the non-spherical evolution of a pulsating bubble interacting with a stationary air bubble attached to a fixed structure were performed using a three-dimensional boundary integral method by implementing the mirror image method to simplify the processing of the numerical model. Code validation was accomplished by comparing the numerical results with the laboratory experimental data obtained in our previous study. Complex phenomena were observed, including three types of bubble jet forms, which depended strongly on the distance parameter with respect to the initial location of the bubble from the plate, the bubble strength parameter and the initial air bubble radius parameters. The results of the simulations provide detail insight into interesting bubble jetting phenomena,such as bubble splitting, jets moving away from the plate, and bubble shedding. The dimensionless distance parameter and the initial air bubble radius parameter play a major role in determining the shapes of two bubbles and the jetting direction. The air bubble strength parameter did not change the bubble jet direction but influenced the bubble *** detachment of the attached air bubble under oscillating bubble suction was easily observed for a small initial air bubble. These results showed that bubble jetting toward the plate was manipulated through the effect of attached air bubble, and that cavitation-based applications and underwater explosion bubble may benefit from this erosion mitigation approach.

关键词： bubble dynamics attached air bubble bubble collapse liquid jet

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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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An Innovative Coupled Common-Node Discrete Element Method-Smoothed Particle Hydrodynamics Model Developed with LS-DYNA and Its Applications

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China Ocean engineering 2024年第3期38卷 467-482页

作者： SHEN Zhong-xiang WANG Wen-qing XU Cheng-yue LUO Jia-xin LIU Ren-wei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

In this study,a common-node DEM-SPH coupling model based on the shared node method is proposed,and a fluid–structure coupling method using the common-node discrete element method-smoothed particle hydrodynamics(DS-SPH)method is developed using LS-DYNA *** DEM and SPH are established on the same node to create common-node DEM-SPH particles,allowing for fluid–structure *** simulations of various scenarios,including water entry of a rigid sphere,dam-break propagation over wet beds,impact on an ice plate floating on water and ice accumulation on offshore structures,are *** interaction between DS particles and SPH fluid and the crack generation mechanism and expansion characteristics of the ice plate under the interaction of structure and fluid are also *** results are compared with available data to verify the proposed coupling ***,the simulation results demonstrated that controlling the cutoff pressure of internal SPH particles could effectively control particle splashing during ice crushing failure.

关键词： common-node DEM-SPH fluid-structure interaction discrete element method smoothed particle hydrodynamics

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