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A Time-Domain Numerical Simulation for Free Motion Responses of Two Ships Advancing in Head Waves
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作者 PAN Su-yong CHENG Yong 《China Ocean Engineering》 SCIE EI CSCD 2024年第3期519-530,共12页
The constant panel method within the framework of potential flow theory in the time domain is developed for solving the hydrodynamic interactions between two parallel ships with forward speed.When solving problems wit... The constant panel method within the framework of potential flow theory in the time domain is developed for solving the hydrodynamic interactions between two parallel ships with forward speed.When solving problems within a time domain framework,the free water surface needs to simultaneously satisfy both the kinematic and dynamic boundary conditions of the free water surface.This provides conditions for adding artificial damping layers.Using the Runge−Kutta method to solve equations related to time.An upwind differential scheme is used in the present method to deal with the convection terms on the free surface to prevent waves upstream.Through the comparison with the available experimental data and other numerical methods,the present method is proved to have good mesh convergence,and satisfactory results can be obtained.The constant panel method is applied to calculate the hydrodynamic interaction responses of two parallel ships advancing in head waves.Numerical simulations are conducted on the effects of forward speed,different longitudinal and lateral distances on the motion response of two modified Wigley ships in head waves.Then further investigations are conducted on the effects of different ship types on the motion response. 展开更多
关键词 ship motions time domain simulation forward speed different distances wave loads
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Multipoint Heave Motion Prediction Method for Ships Based on the PSO-TGCN Model
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作者 DING Shi-feng MA Qun +2 位作者 ZHOU Li HAN Sen DONG Wen-bo 《China Ocean Engineering》 SCIE EI CSCD 2023年第6期1022-1031,共10页
During ship operations,frequent heave movements can pose significant challenges to the overall safety of the ship and completion of cargo loading.The existing heave compensation systems suffer from issues such as dead... During ship operations,frequent heave movements can pose significant challenges to the overall safety of the ship and completion of cargo loading.The 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 movements.In 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 conditions.To enhance the dataset's suitability for training and reduce interference,various filter algorithms are employed to optimize the dataset.The training process utilizes simulated heave data under different sea conditions and measured heave data from multiple points.The 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 positions.By performing a comparative study,it was also found that the present method achieves better performance that other popular methods.This model can provide technical support for intelligent ship control,improve the control accuracy of intelligent ships,and promote the development of intelligent ships. 展开更多
关键词 ship motion prediction time delay multipoint forecast time-graph convolutional neural network particle swarm optimization
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Review on the Progress and Issues in Liquid Tank Sloshing of Ships
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作者 ZHANG Zhen TAO Ai-feng +1 位作者 WU Qiao-rui XIE Yong-he 《China Ocean Engineering》 SCIE EI CSCD 2023年第5期709-724,共16页
With the development of large liquid cargo ships,liquid tank sloshing has gradually become a hot research topic in the area of shipping and ocean Engineering.Liquid tank sloshing,characterized by strong nonlinearity a... With the development of large liquid cargo ships,liquid tank sloshing has gradually become a hot research topic in the area of shipping and ocean Engineering.Liquid tank sloshing,characterized by strong nonlinearity and randomness,not only affects the stability of the ship but also generates a huge impact force on the wall of the tank.To further investigate liquid tank sloshing,a comprehensive review is given on the research process of the most focused subjects of liquid sloshing.Summarizing the existing research will help to identify issues in the current field and provide useful references.The methods for investigating sloshing,the research progress and the situations worldwide are discussed.The advantages and defects of experiments and numerical simulations are also explored.The problems which need to be explored in the future are subsequently proposed. 展开更多
关键词 naval architecture and marine engineering liquid tank sloshing liquid cargo ship large deformation progress review
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Deep Neural Network Based Detection and Segmentation of Ships for Maritime Surveillance
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作者 Kyamelia Roy Sheli Sinha Chaudhuri +1 位作者 Sayan Pramanik Soumen Banerjee 《Computer Systems Science & Engineering》 SCIE EI 2023年第1期647-662,共16页
In recent years,computer visionfinds wide applications in maritime surveillance with its sophisticated algorithms and advanced architecture.Auto-matic ship detection with computer vision techniques provide an efficien... In recent years,computer visionfinds wide applications in maritime surveillance with its sophisticated algorithms and advanced architecture.Auto-matic ship detection with computer vision techniques provide an efficient means to monitor as well as track ships in water bodies.Waterways being an important medium of transport require continuous monitoring for protection of national security.The remote sensing satellite images of ships in harbours and water bodies are the image data that aid the neural network models to localize ships and to facilitate early identification of possible threats at sea.This paper proposes a deep learning based model capable enough to classify between ships and no-ships as well as to localize ships in the original images using bounding box tech-nique.Furthermore,classified ships are again segmented with deep learning based auto-encoder model.The proposed model,in terms of classification,provides suc-cessful results generating 99.5%and 99.2%validation and training accuracy respectively.The auto-encoder model also produces 85.1%and 84.2%validation and training accuracies.Moreover the IoU metric of the segmented images is found to be of 0.77 value.The experimental results reveal that the model is accu-rate and can be implemented for automatic ship detection in water bodies consid-ering remote sensing satellite images as input to the computer vision system. 展开更多
关键词 Auto-encoder computer vision deep convolution neural network satellite imagery semantic segmentation ship detection
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Applying the vantage PDMS to jack-up drilling ships 被引量:2
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作者 殷鹏 陈渊明 +3 位作者 崔同凯 王子申 巩立江 于香芬 《Journal of Marine Science and Application》 2009年第3期228-232,共5页
The plant design management system (PDMS) is an integrated application which includes a database and is useful when designing complex 3-D industrial projects. It could be used to simplify the most difficult part of ... The plant design management system (PDMS) is an integrated application which includes a database and is useful when designing complex 3-D industrial projects. It could be used to simplify the most difficult part of a subsea oil extraction project-detailed pipeline design. It could also be used to integrate the design of equipment, structures, HVAC, E-ways as well as the detailed designs of other specialists. This article mainly examines the applicability of the Vantage PDMS database to pipeline projects involving jack-up drilling ships. It discusses the catalogue (CATA) of the pipeline, the spec-world (SPWL) of the pipeline, the bolt tables (BLTA) and so on. This article explains the main methods for CATA construction as well as problem in the process of construction. In this article, the authors point out matters needing attention when using the Vantage PDMS database in the design process and discuss partial solutions to these questions. 展开更多
关键词 Vantage PDMS component database rate database BOLT jack-up drilling ships
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Research on a Multi-grid Model for Passenger Evacuation in Ships 被引量:4
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作者 Miao Chen Duanfeng Han Haipeng Zhang 《Journal of Marine Science and Application》 2011年第3期340-346,共7页
In order to enhance the authenticity and accuracy of passenger evacuation simulation in ships, a new multi-grid model was proposed on the basis of a traditional cellular automata model. In the new model finer lattices... In order to enhance the authenticity and accuracy of passenger evacuation simulation in ships, a new multi-grid model was proposed on the basis of a traditional cellular automata model. In the new model finer lattices were used, interaction of force among pedestrians or between pedestrians and constructions was considered, and static floor fields in a multi-level exit environment were simplified into cabin and exit static floor fields. Compared with the traditional cellular automata model, the multi-grid model enhanced the continuity of the passengers'track and the precision of the boundary qualifications. The functions of the dislocation distribution of passengers as well as partial overlap of tracks due to congestion were realized. Furthermore, taking the typical cabin environment as an example, the two models were used to analyze passenger evacuation under the same conditions. It was found that the laws of passenger evacuation simulated by the two models are similar, while the simulation's authenticity and accuracy are enhanced by the multi-grid model. 展开更多
关键词 passengers' evacuation in ships multi-grid model simulation evacuation floor field interaction of force
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Improved Formula for Estimating Added Resistance of Ships in Engineering Applications 被引量:2
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作者 Shukui Liu Baoguo Shang +1 位作者 Apostolos Papanikolaou Victor Bolbot 《Journal of Marine Science and Application》 CSCD 2016年第4期442-451,共10页
The authors previously introduced a semi-empirical formula that enabled fast estimation of the added resistance of ships in head waves, and in this study the formula is further refined for easy use in engineering appl... The authors previously introduced a semi-empirical formula that enabled fast estimation of the added resistance of ships in head waves, and in this study the formula is further refined for easy use in engineering applications. It includes an alternative ship draft correction coefficient, which better accounts for the wave pressure decay with ship’s draft. In addition, it only uses the speed and main characteristics of the ship and wave environment as input, and has been simplified to the extent that it can be readily processed using a pocket calculator. Extensive validations are conducted for different ship types at low to moderate speeds in various typical irregular sea conditions, and encouraging results are obtained. This relevant and topical research lies within the framework of the recent IMO MEPC.232(65) (2013) EEDI guidelines for estimating the minimum powering of ships in adverse weather conditions, which specify for the use of simple methods in current Level 2 assessment within engineering applications.Keywords: added resistance, minimum power, IMO regulation, EEDI regulation, weather coefficient, semi-empirical formulas, ships, head waves 展开更多
关键词 added resistance minimum power IMO regulation EEDI regulation weather coefficient semi-empirical formulas ships head waves
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Dynamic Interaction of Parallel Moving Ships in Close Proximity 被引量:2
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作者 M. Rafiqul Islam Motohiko Murai 《Journal of Marine Science and Application》 2013年第3期261-271,共11页
Nowadays,there are many studies conducted in the field of marine hydrodynamics which focus on two vessels traveling and floating in sufficiently close proximity to experience significant interactions.The hydrodynamic ... Nowadays,there are many studies conducted in the field of marine hydrodynamics which focus on two vessels traveling and floating in sufficiently close proximity to experience significant interactions.The hydrodynamic behavior of parallel moving ships in waves is an interesting and important topic of late.A numerical investigation has been carried out for the prediction of wave exciting forces and motion responses of parallel moving ships in regular waves.The numerical solution was based on 3D distribution technique and using the linear wave theory to determine the exciting forces and ship's motion.The speed effects have been considered in the Green function for more realistic results.The numerical computations of wave exciting forces and motion responses were carried out for a Mariner and Series 60 for the purpose of discovering different Froude numbers and different separation distances in head sea conditions.Based on the numerical computations,it was revealed that the sway,roll and yaw have a significant effect due to hydrodynamic interaction. 展开更多
关键词 3D source distribution dynamic interaction close proximity parallel moving ships ship motion
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Recent Developments in Fatigue Assessment of Ships and Offshore Structures 被引量:2
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作者 Yan Dong Y.Garbatov C.Guedes Soares 《Journal of Marine Science and Application》 CSCD 2022年第4期3-25,共23页
A review is provided of various approaches that have been adopted recently to assess the fatigue of ships and offshore structures.The relevant fatigue loading is reviewed first,focusing on the successive loading and u... A review is provided of various approaches that have been adopted recently to assess the fatigue of ships and offshore structures.The relevant fatigue loading is reviewed first,focusing on the successive loading and unloading of the cargo and the transient loadings.The factors influencing fatigue strength are discussed,including the geometrical parameters,material,residual stress,and ones related to the environment.Different approaches for fatigue analyses of seam-welded joints are covered,i.e.,the structural stress or strain approach,the notch stress or strain approach,notch intensity approach,and the crack propagation approach. 展开更多
关键词 ships and offshore structures Fatigue loading Influencing factors Fatigue analysis approaches
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Test Study on Current Force on Mooring Ships 被引量:1
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作者 Zhang, Furan Zhao, Jun Zhang, Xueqin 《China Ocean Engineering》 SCIE EI 1993年第2期225-242,共18页
In respect of an offshore berthing pillar, the test study result of current force acting on mooring ships is described in this paper. Empirical and semi-empirical relationships of current force coefficient are given a... In respect of an offshore berthing pillar, the test study result of current force acting on mooring ships is described in this paper. Empirical and semi-empirical relationships of current force coefficient are given according to the angle between the flow direction and the ship's longitudinal axis, which are coincident with the result of theoretical analysis. 展开更多
关键词 Flow of water Loads (forces) Mathematical models Numerical methods Ocean currents Ship models ships
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SYNTHETIC ANALYSIS OF IMPACT LOADING OF SHIPS IN REGULAR WAVES ON PIERS 被引量:1
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作者 Gao, Ming Zhao, Ying Huang, Genfang 《China Ocean Engineering》 SCIE EI 1990年第2期221-230,共10页
In this paper, the results of model tests of impact energy and forces and motions of moored ships from 20,000 dwt to 200,000 dwt in regular waves upon piers are synthetically analyzed. Based on the concept of wave ene... In this paper, the results of model tests of impact energy and forces and motions of moored ships from 20,000 dwt to 200,000 dwt in regular waves upon piers are synthetically analyzed. Based on the concept of wave energy transmission and the theory of vibration, a semi-empirical formula for evaluating impact energy and forces is proposed. 展开更多
关键词 Materials Testing IMPACT ships Testing Vibrations THEORY
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Wave Loads and Motions of Ships and Offshore Structures 被引量:1
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作者 C.Guedes Soares Wenyang Duan 《Journal of Marine Science and Application》 CSCD 2018年第3期281-283,共3页
The special issue on wave loads and motions of ships and offshore structures is the outcome of a workshop on the same topic that was organised in Harbin Engineering University in November 2017 with the objective of br... The special issue on wave loads and motions of ships and offshore structures is the outcome of a workshop on the same topic that was organised in Harbin Engineering University in November 2017 with the objective of bringing together recent work done on the subject area and providing a forum for discussing these results. 展开更多
关键词 WAVE Loads MOTIONS of ships providing
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A Non-geometrically Similar Model for Predicting the Wake Field of Full-scale Ships 被引量:1
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作者 Chunyu Guo Qi Zhang Yu Shen 《Journal of Marine Science and Application》 CSCD 2015年第3期225-233,共9页
The scale effect leads to large discrepancies between the wake fields of model-scale and actual ships, and causes differences in cavitation performance and exciting forces tests in predicting the performance of actual... The scale effect leads to large discrepancies between the wake fields of model-scale and actual ships, and causes differences in cavitation performance and exciting forces tests in predicting the performance of actual ships. Therefore, when test data from ship models are directly applied to predict the performance of actual ships, test results must be subjected to empirical corrections. This study proposes a method for the reverse design of the hull model. Compared to a geometrically similar hull model, the wake field generated by the modified model is closer to that of an actual ship. A non-geometrically similar model of a Korean Research Institute of Ship and Ocean Engineering (KRISO)’s container ship (KCS) was designed. Numerical simulations were performed using this model, and its results were compared with full-scale calculation results. The deformation method of getting the wake field of full-scale ships by the non-geometrically similar model is applied to the KCS successfully. 展开更多
关键词 wake field full-scale ships non-geometrically similar model scale effect KRISO’s container ship (KCS)
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Dynamical Correction of Control Laws for Marine Ships’ Accurate Steering 被引量:1
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作者 Evgeny I. Veremey 《Journal of Marine Science and Application》 2014年第2期127-133,共7页
The objective of this work is the analytical synthesis problem for marine vehicles autopilots design. Despite numerous known methods for a solution, the mentioned problem is very complicated due to the presence of an ... The objective of this work is the analytical synthesis problem for marine vehicles autopilots design. Despite numerous known methods for a solution, the mentioned problem is very complicated due to the presence of an extensive population of certain dynamical conditions, requirements and restrictions, which must be satisfied by the appropriate choice of a steering control law. The aim of this paper is to simplify the procedure of the synthesis, providing accurate steering with desirable dynamics of the control system. The approach proposed here is based on the usage of a special unified multipurpose control law structure that allows decoupling a synthesis into simpler particular optimization problems. In particular, this structure includes a dynamical corrector to support the desirable features for the vehicle's motion under the action of sea wave disturbances. As a result, a specialized new method for the corrector design is proposed to provide an accurate steering or a trade-off between accurate steering and economical steering of the ship. This method guaranties a certain flexibility of the control law with respect to an actual environment of the sailing;its corresponding turning can be realized in real time onboard. 展开更多
关键词 marine ships control law dynamical corrector accurate steering autopilot sea wave
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Development and Management Status of Voluntary Observing Ships in China 被引量:1
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作者 刘家沂 《Marine Science Bulletin》 CAS 2009年第1期90-96,共7页
Voluntary observing ship (VOS) observations are international obligations that must be fulfilled by China. Currently, the number of Chinese VOSs is showing a decreasing trend, which has decreased from more than one ... Voluntary observing ship (VOS) observations are international obligations that must be fulfilled by China. Currently, the number of Chinese VOSs is showing a decreasing trend, which has decreased from more than one hundred ships in the past to the current number of thirty something ships. Moreover, the observation capabilities have many existing problems, such as relatively outdated observation measures, simple observation parameters, and lack of observation data. Fundamentally speaking, the operation mechanism of VOSs lacks effective systematic assurance and protection. Consequently, these VOSs are unable to have sufficient operational capabilities and cannot effectively fulfill their international obligations. 展开更多
关键词 voluntary observing ship (VOS) marine observations ship monitoring
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Internet of Ships: The Future Ahead 被引量:2
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作者 Guangwu Liu Rodrigo Perez +1 位作者 Jesus A. Muñoz Francisco Regueira 《World Journal of Engineering and Technology》 2016年第3期220-227,共9页
There are many advantages of using Computer Aided Design (CAD) Systems in a shipbuilding environment: ease of design, speed of construction, use and reuse of information, etc. It is expected that in future CAD tools w... There are many advantages of using Computer Aided Design (CAD) Systems in a shipbuilding environment: ease of design, speed of construction, use and reuse of information, etc. It is expected that in future CAD tools will advance further and allow greater information management and virtual access through smart devices. The authors of this paper talk about a new concept in shipbuilding, the Internet-of-Ships (IoS) which would have a deep impact on the ship design and production, with a huge diversity of present and potential applications. 展开更多
关键词 Internet of ships Ship Design Shipbuilding CAD Systems
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A Hydroelastic Analysis of the Afterbody Vibration of Ships
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作者 Fan Wu Rixiu Guo(University of Naval Engineering,Wuhan 430033, P.R.China) 《武汉理工大学学报(交通科学与工程版)》 1999年第S1期98-101,共4页
The paper employs three dimensional hydroelastic theory to describe the afterbody structure and surrounding water unifiedly to establish a hydroelastic analysis approach.It lays emphasis on the development of the meth... The paper employs three dimensional hydroelastic theory to describe the afterbody structure and surrounding water unifiedly to establish a hydroelastic analysis approach.It lays emphasis on the development of the method for calculating the afterbody vibration and the development of a software system for the hydroelastic analysis of the afterbody vibration with pre and post processing systems.A special beam element device connecting FE model and beam model to simulate the ship structures is proposed and the general principles are given to determine the relevant parameters of the special beam elements.The afterbody vibration of a ship and its dynamic responses under the excitation of the propeller induced forces are calculated by the software system developed by the author.The numerical results obtained are compared with the measured results.They are in good agreement.Thereby,the reliability and practicability of the method and software system developed in the paper are validated. 展开更多
关键词 afterbody VIBRATION of ships FLUID STRUCTURE INTERACTION hydroelastic analysis
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Practical Solutions for Reducing Container Ships' Waiting Times at Ports Using Simulation Model
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作者 Abdorreza Sheikholeslami Gholamreza Ilati Yones Eftekhari Yeganeh 《Journal of Marine Science and Application》 2013年第4期434-444,共11页
The main challenge for container ports is the planning required for berthing container ships while docked in port.Growth of containerization is creating problems for ports and container terminals as they reach their c... The main challenge for container ports is the planning required for berthing container ships while docked in port.Growth of containerization is creating problems for ports and container terminals as they reach their capacity limits of various resources which increasingly leads to traffic and port congestion.Good planning and management of container terminal operations reduces waiting time for liner ships.Reducing the waiting time improves the terminal’s productivity and decreases the port difficulties.Two important keys to reducing waiting time with berth allocation are determining suitable access channel depths and increasing the number of berths which in this paper are studied and analyzed as practical solutions.Simulation based analysis is the only way to understand how various resources interact with each other and how they are affected in the berthing time of ships.We used the Enterprise Dynamics software to produce simulation models due to the complexity and nature of the problems.We further present case study for berth allocation simulation of the biggest container terminal in Iran and the optimum access channel depth and the number of berths are obtained from simulation results.The results show a significant reduction in the waiting time for container ships and can be useful for major functions in operations and development of container ship terminals. 展开更多
关键词 CONTAINER ships WAITING time access channel depth quay length simulation model ENTERPRISE dynamics BERTH ALLOCATION
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Numerical Study on Motion Responses of Two Parallel Ships During Underway Replenishment by the Semi-Analytical HOTP Method
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作者 YANG Yun-tao ZHU Ren-chuan +1 位作者 MA Chao GAO Hui 《China Ocean Engineering》 SCIE EI CSCD 2022年第2期233-246,共14页
Motion responses of two ships advancing parallel in waves with hydrodynamic interactions are investigated in this paper. Within the framework of the frequency-domain potential flow theory, a semi-analytical higher-ord... Motion responses of two ships advancing parallel in waves with hydrodynamic interactions are investigated in this paper. Within the framework of the frequency-domain potential flow theory, a semi-analytical higher-order translating-pulsating source(HOTP) method is presented to solve the problems of coupled radiation and diffraction potential. The method employs nine-node bi-quadratic curvilinear elements to discretize the boundary integral equations(BIEs) constructed over the mean wetted surface of the two ship hulls. In order to eliminate the numerical oscillation, analytical quadrature formulas are derived and adopted to evaluate the integrals related to the Froudedependent part of the Green’s function along the horizontal direction in the BIEs. Based on the method, a numerical program is originally coded. Through the calculations of hydrodynamic responses of single ships, the numerical implementation is proved successful. Then the validated program is applied in the investigations on the hydrodynamic interactions of two identical Wigley Ⅲ hulls and the underway replenishment of a frigate and a supply ship in waves with and without stagger, respectively. The comparison between the present computed results with experimental data and numerical solutions of other methods shows that the semi-analytical HOTP method is of higher accuracy than the pulsating source Green’s function method with speed correction and better stability than the traditional HOTP method based on Gauss quadrature. In addition, for two ships with obviously different dimensions,the influence of hydrodynamic interactions on the smaller ship is found to be more noticeable than that on the larger ship, which leads to the differences between the motions of frigate with and without the presence of supply ship. 展开更多
关键词 semi-analytical HOTP method two parallel ships underway replenishment coupled motions
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Eradication of algae in ships’ ballast water by electrolyzing
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作者 DANG Kun SUN Pei-ting +1 位作者 XIAO Jing-kun SONG Yong-xin 《Journal of Marine Science and Application》 2006年第4期58-61,共4页
In order to verify the effectiveness of electrolytic treatment on ships’ ballast water, experiments are carried out by a pilot system in laboratory. The raw seawater and seawater with different concentrations of diff... In order to verify the effectiveness of electrolytic treatment on ships’ ballast water, experiments are carried out by a pilot system in laboratory. The raw seawater and seawater with different concentrations of different algae are simulated as ships’ ballast water. The algae in the raw seawater can be killed if it is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L. If the seawater with one kind of algae (Nitzschia closterum, Dicrateria spp., or Pyramidomonnas sp.105cells/mL) is treated by electrolysis with an initial residual chlorine concentration of 5 mg/L, the alga can be sterilized. If the seawater with one kind of algae (Dunaliella sp., Platymonas or Chlorella spp.) is directly treated by electrolyzing with an initial residual chlorine concentration of 4 mg/L, the instant mortality changes with the concentration of different algae. However, after 72 hours, in all treated samples, there are no live algal cells found. 展开更多
关键词 ships ballast water ELECTROLYSIS ALGAE
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