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Taravella, Brandon M., e William S. Vorus. "A Wave Resistance Formulation for Slender Bodies at Moderate to High Speeds". Journal of Ship Research 56, n.º 04 (1 de dezembro de 2012): 207–14. http://dx.doi.org/10.5957/jsr.2012.56.4.207.
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T. Francis Ogilvie (1972) developed a Green's function method for calculating the wave profile of slender ships with fine bows. He recognized that near a slender ship's bow, rates of change of flow variables axially should be greater than those typically assumed in slender body theory. Ogilvie's result is still a slender body theory in that the rates of change in the near field are different transversely (a half-order different) than axially; however, the difference in order of magnitude between them is less than in the usual slender body theory. Typical of slender body theory, this formulation results in a downstream stepping solution (along the ship's length) in which downstream effects are not reflected upstream. Ogilvie, however, developed a solution only for wedge-shaped bodies. Taravella, Vorus, and Givan (2010) developed a general solution to Ogilvie's formulation for arbitrary slender ships. In this article, the general solution has been expanded for use on moderate to high-speed ships. The wake trench has been accounted for. The results for wave resistance have been calculated and are compared with previously published model test data.
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Maulidi, A., T. Irmiyana, A. F. Ilman, Annafiyah e Kuzzairi. "The development of internet-of-things (IoT)-based safety monitoring system in north sea madura". IOP Conference Series: Earth and Environmental Science 972, n.º 1 (1 de janeiro de 2022): 012013. http://dx.doi.org/10.1088/1755-1315/972/1/012013.
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Abstract Internet of Things (IoT) is a concept where an object has the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction, used in the navigation and monitoring systems for ships safety. This monitoring system receives data from the AIS Transceiver, the equipment installed, and integrated with the ship’s network infrastructure. The equipment transmits signatures tracking the ships sailing and going ashore as the AIS Receiverreceives them. By the increasing number of ships transporting fuels and natural gas from mine-producing areas in the north sea Madura, passenger and cargo ships heading to Surabaya port. The development of an IoT-based monitoring system is prominent, it will ease to monitor the movements of ships. It may also become the basis for further developing ships monitoring systems to improve safety operating in the north sea Madura. In the initial system design, the system can transmit and receive static data, such as ships’ID and names. Then it can transmit and receive dynamic data, such as the ships’ geographical coordinate, to identify marine traffic around the areas. Later, this system could be developed so that it not only collects data but also proceeds the data to analyze the ships condition.
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Han, J., e M. Murai. "A parametric study on the initial transverse stability of suspension ships". IOP Conference Series: Materials Science and Engineering 1294, n.º 1 (1 de dezembro de 2023): 012021. http://dx.doi.org/10.1088/1757-899x/1294/1/012021.
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Abstract Suspension ships are a novel type of ships that utilize a suspension system as an integral part of their structure. One critical aspect of a suspension ship is its stability characteristics. The parameters that affect the initial transverse stability of these ships include the ship’s mass ratio, loaded height of suspension, placement location height of suspension, and beam. It is found that designing a suspension ship in monohull configuration is more difficult than in a catamaran configuration. Special attention is required when the static mass ratio is below 2 for both monohulls and catamarans.
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Spouge, J. R. "The Safety of General Cargo Ships". International Journal of Maritime Engineering 145, A4 (1 de dezembro de 2003): 29–40. http://dx.doi.org/10.3940/rina.ijme.2003.a4.14031.
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Yang, Shujie, e Wei Sun. "Effective Ship Domains Considering Ship Encounter Situations and Speeds". Journal of Physics: Conference Series 2219, n.º 1 (1 de abril de 2022): 012031. http://dx.doi.org/10.1088/1742-6596/2219/1/012031.
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Abstract Ship domain is an important concept in assessing navigation situation and planning collision avoidance manoeuvres of a ship. For purpose of improving the precision and adaptability of the ship domains, effective ship domains are proposed for ships with different speeds in a variety of encounter situations in this work. Firstly, the COLREGs-based division of encounter types and corresponding collision avoidance actions are further optimized. Therefore, the problem of unclear division of responsibilities caused by the intersection of relative position and relative heading is resolved. On this basis, ship domains are determined by the encounter situations and the target ship’s speed. More specifically, the ship domain is approximated to a circle, and the dependence of the domain size on the encounter situation and the target ship’s speed has been analysed and described, that enable us to determine effective ships domains for ships varying in speeds and encounter situations. The simulation results show that ships can make effective collision-avoidance actions in different encounter scenarios based on the optimized COLREGs-based division of encounter types and effective ship domains.
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Pérez-Canosa, José M., José A. Orosa, Feliciano Fraguela e Pablo López-Varela. "Proposal of Optimal Operation in Ship Rolling Motion Considering Sea State Conditions". Journal of Marine Science and Engineering 10, n.º 5 (14 de maio de 2022): 669. http://dx.doi.org/10.3390/jmse10050669.
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Most of the research on ship rolling motion concerns a specific type of ship, such as containerships, or analyzes sailing during certain wave characteristics, rather than the full spectrum of waves that can be encountered during the entire sea route. To date, the most frequent merchant ships in the world are general cargo ships, where the ship’s behaviour at any sea condition has a great influence on overall safety, as well as the lashing design of non-standardized cargo. For this reason, the present paper aimed to study ship-performance models, starting with concepts of the basic physics of ships and waves. Firstly, the ship’s behaviour was analyzed from a theoretical point of view, both in calm waters and when sailing in waves, but independently. Afterwards, the ship-waves system was analyzed during rolling with all variables accounted for at the same moment, with the objective of obtaining roughly realistic models. Relevant results are shown in each of the models, which may be of great interest for ship operators and, in general, for the shipping industry, so as to improve the safety of maritime transport. Finally, these results were validated with a case study.
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Vio, Igor, e Mate Brdar. "Maritime Autonomous Surface Ships – International and National Legal Framework". Journal of Maritime & Transportation Science 62, n.º 1 (agosto de 2022): 141–55. http://dx.doi.org/10.18048/2022.62.09.
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The use of autonomous ships in shipping industry is increasingly being analysed and occupies the maritime sector. In the maritime industry, the introduction of autonomous underwater crafts began first this trend, after which the development of autonomous surface ships has followed. Unmanned vessels include ships operated remotely by an operator on land and autonomous ships that are fully operated by the computer programmes and only in exceptional situations the ship’s crewmembers or other human resources may be involved. The commercial application of these facilities is becoming more and more certain and this topic is increasingly being discussed. This trend obviously poses a huge challenge to all maritime actors, as well as lawmakers at international and national level. Namely, although the current development of maritime law has effectively regulated most of new technologies, all these standards and regulations have been adapted for the use of the conventional manned ships. A number of questions concerning the possible change in international and national regulations regarding the implementation of autonomous ships have been raised. It is considered as a priority within the framework of IMO unification instruments and changes in the Maritime Code of the Republic of Croatia. This paper presents various legal aspects of the use of autonomous ships with the aim to define the autonomous ship and to examine how present international conventions and national regulations could adapt to provide the legal framework to the introduction of autonomous ships.
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Prill, Katarzyna, Cezary Behrendt, Marcin Szczepanek e Iwona Michalska-Pożoga. "A New Method of Determining Energy Efficiency Operational Indicator for Specialized Ships". Energies 13, n.º 5 (1 de março de 2020): 1082. http://dx.doi.org/10.3390/en13051082.
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Limitation of CO2 emission is one of the main goals and regulations introduced by the international institutions’ rules. In the case of ships using oil-related and gas fuels this problem is dealt with by the International Maritime Organization (IMO) introducing the methodology of Energy Efficiency Operational Indicator (EEOI) determining for ships being under exploitation. The methodology allows for determining EEOI for seven types of ships, for which the value of this index depends on the amount of transported cargo or number of passengers, type of and amount of fuel used, as well as distance travelled by the ship. Such a methodology cannot be used for the specialized ships, whose exploitation tasks are different to the ships of the trade fleet that transport the cargo or the passengers. The methodology allows for determining EEOI for seven types of ships and it does not include specialized ships. The article presents a new methodology of determining EEOI for specialized ships that takes the characteristics of their exploitation into consideration. The way of its use has been presented taking into account the results of exploitation studies carried out on the chosen research and training ship. Obtained results and their analysis allowed for energy efficiency assessment of research and training ships depending on exploitation tasks, voyage time, type of fuel used, distance travelled and ship’s speed. EEOI index value determines energy efficiency of the vessel power system that is directly connected to the amount of the liquid or gas fuel used and the amount of emitted CO2. The aim should be to minimalize the value of EEOI index through planning of the exploitation tasks realization order and adjusting the speed of the ship as well as realization time of particular exploitation tasks, in the case of specialized ships. The analysis results can also be used when managing energy efficiency of these types of ships.
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Lee, Dongkeun, Chaeog Lim, Sang-jin Oh, Minjoon Kim, Jun Soo Park e Sung-chul Shin. "Predictive Model for Hydrostatic Curves of Chine-Type Small Ships Based on Deep Learning". Journal of Marine Science and Engineering 12, n.º 1 (18 de janeiro de 2024): 180. http://dx.doi.org/10.3390/jmse12010180.
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Capsizing accidents are regarded as marine accidents with a high rate of casualties per accident. Approximately 89% of all such accidents involve small ships (vessels with gross tonnage of less than 10 tons). Stability calculations are critical for assessing the risk of capsizing incidents and evaluating a ship’s seaworthiness. Despite the high frequency of capsizing accidents involving them, small ships are generally exempt from adhering to stability regulations, thus remaining systemically exposed to the risk of capsizing. Moreover, the absence of essential design documents complicates direct ship stability calculations. This study utilizes hull form feature data—obtained from the general arrangement of small ships—as input for a deep learning model. The model is structured as a multilayer neural network and aims to infer hydrostatic curves, which are required data for stability calculations.
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Zou, Yin Cai, e Wei Gang Zheng. "The Structure Design of Parent-Subsidiary Wind Sailing Boat and the Matching Research of Power Plant". Advanced Materials Research 912-914 (abril de 2014): 1032–36. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1032.
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Wind sailing boat fades out maritime transport industry gradually, because of its existence decreases the ship stability, and threatens mariners and ships security vastly. Project group has worked out high stability and security ship through researching literature and emulation-technique. Through the design of a parent ship and a sub-shipa set of wind sailing system and a water supply and drainage system, and the modeling calculation and analysis about the thrust of the fixed pitch propeller matching with the sailing, we can conclude that the added sub-ships can enhance ships stability in constant speed sailing situation. So it can improve thrust and reduce fuel consumption through increasing the scale of wind sailing.
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Lebedev, O., e I. Lipatov. "Determining the width of the ship’s course using a mathematical model to ensure the safety of the ship’s navigation". Journal of Physics: Conference Series 2131, n.º 3 (1 de dezembro de 2021): 032034. http://dx.doi.org/10.1088/1742-6596/2131/3/032034.
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Abstract Determination of the ship’s course width necessary for the ships safe operation is an urgent task due to the increase in the modern ships’ dimensions. The existing methods for assessing the fairway are calculated with a full re-positioning of the propulsion-rudder complex, according to the maximum drift angle. The vessel movement is considered to be steady, that is, the speed, the drift angles do not depend on time. The relevance of this study is associated with the assessment of determining the width of the fairway at any time interval. This is due to the fact that when passing the river sections, the vessels perform maneuvering with the rudder gear shifted for short periods of time and not at the maximum shift angle. Determination of the parameters of the ship’s movement over time when the navigator manipulates the ship’s controls (control of the rudder device, changing the parameters of the main engines) can be determined by the mathematical model of the ship’s movement. This article discusses the issues of creating a model that adequately describe the processes of vessel movement, including in the conditions of vessel movement along a limited ship’s course. The adequacy of the model was verified using the data of field and model experiments. According to the compiled mathematical model, the calculations were made for various projects of dry cargo ships.
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Šikić, Mario, Andro Jančić, Mihovil Jureško e Đani Mohović. "Analysis of Risks Arising from the Use of Autonomous Vessels". Journal of Maritime & Transportation Science 63, n.º 1 (julho de 2023): 63–74. http://dx.doi.org/10.18048/2023.63.04.
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This paper focuses on the analysis of risks arising from the use of autonomous ships. The concept of autonomy is defined, different levels of autonomy are mentioned, and the differences between unmanned vessels and autonomous ships are well known. The transition to autonomous ships brings certain risks that need to be managed. Therefore, this paper analyses the risks associated with autonomous ships, which have received significant attention in recent years. An important aspect in considering risks is human error, which according to various studies is the most common cause of maritime accidents. However, autonomy also has the potential to create accidents, which manifest in five unacceptable hazards in the initial configuration of the ship. The main hazard human error, interaction with manned vessels and object detection, interaction with the physical environment, system failure, cyber-attacks, and equipment failure. The focus of the ship’s work is to prevent and reduce the probability of critical events and their causes and maximize operational efficiency and performance.
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Kautsar, Nafiri Muhammad, e I Ketut Suastika. "Analysis of The Effect of Hull Vane Lifting Force on Fast Vessel Resistance: Straight Hull Vane". WAVE: Jurnal Ilmiah Teknologi Maritim 17, n.º 1 (13 de agosto de 2023): 22–33. http://dx.doi.org/10.55981/wave.2023.926.
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In previous studies by Saputra, the use of straight Hull Vane® increased ship's resistance. Based on hypothesis, this was caused by lifting force from Hull Vane® being too large, so that ship experienced bow trim. To reduce bow trim, smaller Hull Vane® was made including Hull Vane® with AR = 8.5, AR = 22.9 and AR = 28.94 with speeds which were 11 knots (Fn = 0.34), 17 knots (Fn = 0.53), 20 knots (Fn = 0.62) and 26 knots (Fn = 0.8). From simulation results, it was found that use of a straight Hull Vane® in every aspect ratio variation on vessel was only effective at 11 knots speed which could reduce ship's resistance up to 17%. For speeds above 11 knots, increased in aspect ratio can reduce resistance but resistance on ships with straight Hull Vane® was still greater than on ships without Hull Vane® because lift force by Hull Vane® at ship stern was still too large, so the bow of ship was more submerged than ship without Hull Vane®. This caused value of the wetted surface area (WSA) and value of hydrodynamic pressure more increased than ships without Hull Vane®, so value of ship's resistance also increased.
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Son, Woo-Ju, e Ik-Soon Cho. "Analysis of Trends in Mega-Sized Container Ships Using the K-Means Clustering Algorithm". Applied Sciences 12, n.º 4 (17 de fevereiro de 2022): 2115. http://dx.doi.org/10.3390/app12042115.
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The size of ships is increasing rapidly, and over 400 m length overall mega-sized container ships are predicted to appear in the near future. Consequently, studies on large container ships have been conducted; however, based on the 30,000-TEU (twenty-foot equivalent unit) class container ship’s length overall, the deviation of the predicted range showed an 83.9 m difference from 453.0 m to 536.9 m. This is because simple linear regression analysis does not consider trends according to the type of cargo or the size of the cargo. In this study, 5497 container ships up to 20 years of age with an International Maritime Organization (IMO) number registered were clustered according to the change in ship dimensions by k-means clustering algorithm. Based on the clustered data, deadweight tonnage, TEU, length overall, length between perpendiculars, breadth, and maximum draft of container ships with a coverage rate of 75% were analyzed to predict the change in the main dimensions. The results indicated that for a 30,000-TEU container ship, the predicted length overall is 428.4 m, breadth is 67.6 m, and draft is 17.0 m. This study can help minimize the social costs of designing ports in consideration of future mega-sized container ships.
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An, Zuxu, Huidong Jia, Guogang Yang, Shian Li e Qiuwan Shen. "Modelling and Simulation Analysis of the Fuel Cell Hybrid Propulsion System". Journal of Physics: Conference Series 2661, n.º 1 (1 de dezembro de 2023): 012030. http://dx.doi.org/10.1088/1742-6596/2661/1/012030.
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Abstract Under the pressure of global energy shortage and severe environmental pollution, using new energy in ships will become the mainstream direction of future development. Compared to traditional single fossil fuels, the hybrid system composed of clean energy improves overall cleanliness. Hybrid power design has also attracted widespread attention in academia and industry. Therefore, this article introduces a hybrid propulsion system for ships. It combines Proton-exchange membrane cell (PEMFC) and cell. A simulation model for the propulsion system of hybrid electric ships was established in the MATLAB/SIMULINK simulation environment. It analyzes the ship’s operating speed and power under different operating conditions and allocates the operating power to the hybrid power system through an energy control strategy. Finally, it compares and analyzes the optimization potential and methods of hybrid power systems. The results indicate that the modeling method and energy management strategy used in this article can effectively simulate the load changes and energy allocation of ships under different operating conditions, improving the stability and efficiency of fuel cells.
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Hou, Yuan Hang, Sheng Huang, Wen Quan Wang e Yu Long Hu. "Regression Analysis of Ship Principal Dimensions Based on Improved PSO-BP Algorithm". Advanced Materials Research 308-310 (agosto de 2011): 1029–32. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1029.
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The principal dimensions of naval ships regression analysis via trained BP network by improved PSO is proposed in this paper. Firstly, learning factor is adjusted dynamically, and the improved PSO is implanted in the BP network. Then improved PSO-BP is imported when establishing the regression model of ships’ principal dimensions and comparing its results with the results of polynomial regression. The result shows that BP network trained by improved PSO has higher accuracy and fine character of subsection smooth. Therefore, the model has guidance effect of importance to ship’s top demonstration and preliminary design.
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Dickson, Nancee L. "MERCY SHIPS". Journal of Christian Nursing 5, n.º 4 (1988): 20–24. http://dx.doi.org/10.1097/00005217-198805040-00006.
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Mast, Larry, e Bonnie Usher. "Mercy Ships". Journal of Christian Nursing 25, n.º 1 (janeiro de 2008): 46–47. http://dx.doi.org/10.1097/01.cnj.0000306006.73488.07.
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Ibrahim, Ince Mochamad Arief, Winner Sitorus e Aulia Rifai. "Sale and Purchase of Ships over GT-7 Size without Authentic Deeds in North Morowali Regency". SIGn Jurnal Hukum 5, n.º 1 (22 de agosto de 2023): 195–206. http://dx.doi.org/10.37276/sjh.v5i1.280.
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This research aims to discern and analyze the legal repercussions of selling and purchasing ships over GT-7 size without authentic deeds. This research uses an empirical legal research method. All collected data is then qualitatively analyzed to describe the problem and answer the research objectives. The results show that the preference of the North Morowali community leans more towards the use of receipts as evidence of the sale and purchase of ships over GT-7 size, compared to the formal mechanism of a deed of sale and purchase executed before a Notary. As a result, five ships over GT-7 size operate without Port Clearance, which inevitably places the ship’s captain in a vulnerable position regarding criminal punishment: a maximum imprisonment of five years and a fine of up to IDR 600,000,000. Furthermore, the sale and purchase of ships over GT-7 size without authentic deeds have also resulted in ownership disputes among the local community, as the gross deed of ship registration still lists the previous owner’s identity. Therefore, several recommendations can be proposed to the relevant stakeholders. First, the Harbor Master of Kolonodale Port should conduct intensive socialization regarding the importance of the deed of sale for ships over GT-7 size executed before a Notary. This socialization aims to ensure the clear legal status of ships, raise public awareness about safety and seaworthiness, and prevent potential criminal punishment risks for the captain. Second, as Government Officials, the Ship Registration Officer and Ship Name Transfer Recorder should collaborate with legal institutions to review ships operating in Indonesian waters without Port Clearance. Lastly, Law Enforcement should adopt a mediation approach in resolving ship ownership disputes, prioritizing aspects of justice and truth, thereby preventing further losses for the Northern Morowali community.
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Komar, Ivan, Nenad Vulić e Radovan Antonić. "Specifics of Shafting Alignmentfor Ships in Service". PROMET - Traffic&Transportation 21, n.º 5 (2 de março de 2012): 349–57. http://dx.doi.org/10.7307/ptt.v21i5.250.
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Modern ships are means of transport which, during their entire operational lifespan, need to convey cargo and/or passengers in a safe and reliable way, without jeopardising their safety, and with least possible adverse impacts on the marine environment. The ship’s safety and functionality directly depend on the reliability of her propulsion system, the shafting being the essential unit of the system. The functionality of the ship’s shafting considerably depends on its correct installation. Installation of the ship propulsion shafting is an integral part of the overall positioning (alignment) procedure. Shafting alignment is performed in several stages, starting with the shaft line design, and includes calculating the elastic line and bearing loads, installation of shafting parts onboard ship in compliance with the calculation results, and verifying the alignment results. Procedures are different for ships in service and newly built ships. This paper deals with specific features of the propulsion shafting alignment that is carried out while a ship in service is being converted for a general reason. Unlike a newly built ship, an existing ship imposes additional constraints that should be dealt with in the calculation stage of the process as well as during shafting installation and alignment verification. A calculation approach for ships in service is always different, having specific features from case to case, depending on what is changed and what remains unchanged during the conversion of the ship. The same goes for the implementation and verification of the achieved results. The purpose of this paper is to underline the difference, its contribution being in suggesting the procedure to be followed in case of conversion of an existing vessel. KEY WORDS: ship in service, shafting, alignment, GAP, SAG
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Belov, O. A., I. V. Maloletko, I. A. Romanenkov e S. A. Klementyev. "Analytical calculation of the potential for contact corrosion of metals in the marine environment". Innovatics and Expert Examination, n.º 1(31) (18 de junho de 2021): 119–28. http://dx.doi.org/10.35264/1996-2274-2021-1-119-128.
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One of the most common types of ship corrosion is contact corrosion, which occurs at the interface of dissimilar metals being washed. It poses a serious danger to the ship's hull and ship metal structures, as it leads to a sharp increase in the rate of corrosion damage to one of the contacting metals. Therefore, the fight against contact corrosion is one of the most urgent tasks in the field of anti-corrosion protection of ships. Protection of ships from contact corrosion requires solving a set of interrelated engineering problems that require a quantitative assessment of the rate of corrosion processes on ship structures and the effectiveness of anti-corrosion protection means used on ships [1, 2]. The article discusses an analytical approach in assessing the local rate of electrochemical corrosion processes of ship hull structures based on the phenomenon of polarization using polarization curves and approximation methods.
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Sutralinda, Dety. "Quality Standards for Pollution Prevention Countermeasures for Safety and Security at the Port of Surabaya (Survey o (Survey on Tanker Ships at the Port of Surabaya)". International Journal of Science, Technology & Management 5, n.º 2 (29 de março de 2024): 411–23. http://dx.doi.org/10.46729/ijstm.v5i2.1071.
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The purpose of this study is to determine and analyze the activities of the shipping fleet in the use and use of aids to prevent and prevent pollution of the marine environment, the attention and willingness of officers and crew on the prevention and prevention of pollution of the marine environment, as well as strategies for handling and preventing pollution of the marine environment to support safety and shipping security. By using descriptive qualitative research, data collection is done through interviews and documentation studies to be further processed and analyzed. The results of the first analysis showed that there were still ships that were not in accordance with international standards on the means of supporting marine pollution prevention equipment and there were still crew members who were not aware of the need to prevent sea pollution. The second analysis shows that the attention and willingness of the ship's officers and crew still aboard the ship's officers who neglected the prevention of pollution by ships, not all crew members have the habit of paying attention to pollution by ships. The results of the third analysis indicate that there are still shipping companies that have not yet fully equipped the pollution prevention aids on ships, when shipping equipment is damaged it is rather difficult to provide a replacement. The results of the fourth analysis show that the strategy for preventing and preventing pollution of the marine environment to support shipping safety and security is the result of an analysis of the strengths and weaknesses as well as opportunities and threats to increase the prevention and prevention of pollution of the marine environment to support shipping safety and security.
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Hasanspahić, Nermin, Marijana Pećarević, Niko Hrdalo e Leo Čampara. "Analysis of Ballast Water Discharged in Port—A Case Study of the Port of Ploče (Croatia)". Journal of Marine Science and Engineering 10, n.º 11 (9 de novembro de 2022): 1700. http://dx.doi.org/10.3390/jmse10111700.
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Ballast water is recognized as a major vector for the transfer of Harmful Aquatic Organisms and Pathogens (HAOP) and a source of sea pollution that negatively affects the environment and human health. Therefore, the International Maritime Organization (IMO) adopted the International Convention for the Control and Management of Ship’s Ballast Water and Sediments (BWM Convention) in 2004. The BWM Convention introduced two standards, Ballast Water Exchange Standard (Regulation D-1) and Ballast Water Performance Standard (Regulation D-2). Ships are required to install Ballast Water Treatment (BWT) equipment in order to comply with Regulation D-2. However, the deadline for the installation of BWT is prolonged until September 2024, and many ships are still complying only with Regulation D-1. In addition, there are specific sea areas where Regulation D-1 cannot be complied with, and hence, HAOP could be easily transferred between ports. Consequently, it is essential to develop a system to protect the marine environment, human health and economy in coastal areas from the introduction of HAOP. This paper analyses ballast water discharged in the Port of Ploče (Croatia) according to ship type, age and flag they are flying. It was found that general cargo ships and bulk carriers discharged most of the ballast (87% of the total quantity) in the Port of Ploče. Moreover, discharged ballast water was analysed according to the origin, and it was found that 70% of discharged ballast originates from the Adriatic Sea. Based on the analysis of the research results and literature review, the ballast water risk assessment (BWRA) method was adopted, however, with certain modifications. The adopted method is modified by an additional risk factor (the deballasting ship’s age), different risk scoring of the deballasting ship type and adding Paris MoU Grey and Black lists flag ships as high-risk ships. As a result, the BWRA method presented in the paper could be used as an early warning system and to facilitate the implementation of adequate measures to prevent pollution by discharged ballast water.
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Claessens, Evrard. "Basic cost–size relations in general cargo ships". Maritime Policy & Management 14, n.º 2 (janeiro de 1987): 163–70. http://dx.doi.org/10.1080/03088838700000018.
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Zhang, Xuan, Mingzhong Yan, Daqi Zhu e Yang Guan. "Marine ship detection and classification based on YOLOv5 model". Journal of Physics: Conference Series 2181, n.º 1 (1 de janeiro de 2022): 012025. http://dx.doi.org/10.1088/1742-6596/2181/1/012025.
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Abstract An improved deep learning neural model YOLOv5-DN based on YOLOv5 is proposed for marine ship detection and classification in the area of harbours and heavy traffic waterways. The CSP-DarkNet module in YOLOv5 is replaced by CSP-DenseNet to promote the accuracy of target detection and classification in the proposed model. Sample marine ships in the data set are divided into six classes: ore carriers, general cargo ships, bulk cargo ships, container ships, passenger ships, and fishing ships to meet the detection needs in the areas of ports and waterways. The data set are grouped into a training set, testing set, and validating set by the proportion of 6:2:2. Experiments show that the improved model has better average accuracy, from 62.2% to 71.6%.
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Lei, Kai. "Integrated Scheduling Optimization of One-Way Channel Ships Entering and Leaving the Port, and Tugboat Distribution". Journal of Architectural Research and Development 6, n.º 6 (21 de novembro de 2022): 23–29. http://dx.doi.org/10.26689/jard.v6i6.4498.
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With the rapid development of shipping industry, the volume of maritime logistics is also increasing. Tugboats are the first service station for ships, and the working efficiency tugboats directly affects the ship’s attendance rate and the port’s service efficiency. Some domestic ports use one-way channel design due to the limitations of geographical position and natural factors. However, due to the particularity of the channel, the ships are entering and leaving the port in a disorderly manner and the tugboats are running empty, which causes problems in the port. Therefore, the port is in urgent need of improving the cooperative dispatching ability of one-way channel and tugboats.
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Yu, Wanneng, Suwen Li, Yonghuai Zhu e Cheng-Fu Yang. "Management and Distribution Strategies for Dynamic Power in a Ship’s Micro-Grid System Based on Photovoltaic Cell, Diesel Generator, and Lithium Battery". Energies 12, n.º 23 (27 de novembro de 2019): 4505. http://dx.doi.org/10.3390/en12234505.
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Combining new energy technology with electric propulsion technology is an effective way to decrease the pollution of water resources caused by cruise ships. This study examines the stable parallel operation of a ship’s micro-grid system through a dynamic power management strategy involving a step change in load. With cruise ships in mind, we construct a micro-grid system consisting of photovoltaics (PV), a diesel generator (DG), and a lithium battery and establish a corresponding simulation model. We then analyze the system’s operating characteristics under different working conditions and present the mechanisms that influence the power quality of the ship’s micro-grid system. Based on an analysis of the power distribution requirements under different working conditions, we design a power allocation strategy for the micro-grid system. We then propose an optimization allocation strategy for dynamic power based on fuzzy control and a load current feed-forward method, and finally, we simulate the whole system. Through this study we prove that the proposed power management strategy not only verifies the feasibility and correctness of the ship’s micro-grid structure and control strategy, but also greatly improves the reliability and stability of the ship’s operation.
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Chirosca, A.-M., L. Rusu e F. Pacuraru. "Study on the behavior of benchmark container ships in regular waves". IOP Conference Series: Materials Science and Engineering 1182, n.º 1 (1 de outubro de 2021): 012013. http://dx.doi.org/10.1088/1757-899x/1182/1/012013.
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Abstract The study of the behaviour of ships in the real sea has become a real challenge in recent years due to climate change, especially in the European sea basin. One of the main categories of types of ships that cross these waters are transport ships. The development of the economy and trade have a major influence on this type of ships, which must be studied and improved in order to be fully exploited. Investigating the ship’s behavior is not a new topic, but the changing environment of the transport ship’s specifications requires continuous study. An alternative to model testing is the use of numerical simulation through which performance can be fully evaluated using only computers, without the need to produce a scale model for testing. Due to improved computer performance, but also the disadvantages of towing testing, numerical simulations have become increasingly popular for determining ship characteristics. The shorter time in which results can be obtained, as well as the ease of controlling and changing the input parameters, contributes to the preference to use numerical simulations, to the detriment of basin tests. In this paper, the behavior of a Post-Panamax benchmark container ship in regular waves was studied. Numerical simulations were performed using SHIPFLOW MOTIONS, a solver that treats potential nonlinear flows for regular waves and provides accurate results by the free surface potential flow panel method. For our case, the simulations were performed for a range of six speeds corresponding to Froude numbers ranged between 0.174 and 0.218, for five nondimensional wavelengths (λ/Lpp) and for four wave heights. Because body discretization is one of the main factors for obtaining accurate results, an additional study was conducted in calm waters on body refinement and the influence that the mesh has on results, for a range of ten grids with different densities.
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Nikitina, Valentina N., Galina G. Lyashko, Nina I. Kalinina, Ekaterina N. Dubrovskaya, Alexander M. Vishnevskiy, Anna B. Razletova e Roman Ya Nizkiy. "Normative and methodological support of control of electromagnetic fields at the ships". Russian Journal of Occupational Health and Industrial Ecology 61, n.º 6 (7 de agosto de 2021): 402–7. http://dx.doi.org/10.31089/1026-9428-2021-61-6-402-407.
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The seafarers carried out the professional activity in a complex electromagnetic environment (EME), with technical means, structural materials, depending on the purpose of the watercraft, architectural features, and vessel classification. There are static electric fields, permanent magnetic and low-frequency electric and magnetic fields on ships. Marine radio-electronic means (REM) creates Electromagnetic fields (EMF) of the radio frequency range that provide communication, the safety of navigation and operation, and solving navigation problems. According to the documents of the sanitary legislation, specialists carry out control of the maximum permissible EMF levels for watercraft and marine structures at the design stage of the vessel by calculating the intensity of electromagnetic fields during commissioning, instrumental control of EMF levels. There are new technical means in modern automated vessels of various types and purposes that create electromagnetic fields in the crew's stay zones, which makes it urgent to improve regulatory and methodological documents in the area of ensuring the electromagnetic safety of the team and passengers. The study aims to develop proposals for regulatory, methodological, and hardware control over compliance with the maximum permissible levels of electromagnetic fields on ships to ensure the electromagnetic safety of the crew. Generalization of materials of own research of EME on ships, systematization of sources of electromagnetic fields. Analysis of regulations in occupational safety and health for the protection of the crew from the effects of EME, methodological documents on the calculation forecasting, and instrumental determination of the levels of electromagnetic fields. Experts have revealed that there are electromagnetic fields of a wide frequency range in the premises of ships and on open decks. The study showed that electromagnetic fields of a wide frequency range are created in the premises of ships and on open decks. Indoors, the most significant is the impact on the crew of electric and magnetic fields with a frequency of 50 Hz created by the ship's electric power systems. In addition, on open decks (at workplaces and in crew recreation areas), the protection of the crew from EMF antennas of the radio frequency range is relevant. Therefore, it is necessary to develop methods for calculating the prediction of EMF levels and improve the means of measuring electromagnetic fields on ships. The most common sources of EMF in the crew's stay areas are radio communication and radar facilities, ship's electric power systems. The task of developing a methodological document on the calculated prediction of EMF levels in rooms and on open decks at the design stage of ships is urgent. In addition, it is necessary to develop devices-meters of electromagnetic fields for instrumental monitoring of EMF levels in actual operating conditions of the vessel.
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Mahdi, Syed Sarosh, Maurizio Mancini, Fabio Sibilio e Francesco Amenta. "Research Questionnaire on Perception of Seafarers about Oral Hygiene and Oral Dietary Habits". World Journal of Dentistry 6, n.º 1 (2015): 1–4. http://dx.doi.org/10.5005/jp-journals-10015-1303.
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ABSTRACT Objectives Dental problems are among the main concerns of seafarers and a relevant cause of medical consultations aboard international vessels. Seafarers may neglect their oral hygiene during long voyages and are known for their excessive intake of beverages or unhealthy food which contains copious amounts of fermentable carbohydrates and sugars, which are prime risk factors of dental caries. Majority of studies done on oral health status of seafarers are dated. This paper presents a questionnaire developed by Centro Internazionale Radio Medico (CIRM), the Italian Telemedical Maritime Assistance Service (TMAS) to investigate the oral hygiene condition of seafarers and to assess their awareness and sensitivity on this pertinent health problem. Methodology A questionnaire including 26 questions covering general information about the subject, including denture status, smoking, drinking and eating habits, general appearance of gingiva, oral muscosa and lips was developed. The research questionnaire was created to assess the oral health situation of Seafarers on board various ships around the world. The questionnaire was forwarded to different ships using the platform of Centro Internationzionale Radio Medico in Rome. Twenty-six questions on various oral hygiene indicators were part of the questionnaire. Captains of the ship were requested to summarize the results on a summary sheet provided by CIRM. CIRM started out sending questionnaire at the end of June 6 and the project concluded in October. Results In the 3 months of the survey, CIRM assisted 1,198 ships. All these ships were requested to take part in the research survey. CIRM received positive response from 65 vessels. The rate of return was 5.4%. Two thousand and sixty seamen filled the questionnaire. No difficulty was reported by ship's captains in summarizing the results of the survey. Conclusion The findings of the research will be presented in an original research article after completion of data analysis. Captains of the ships who took part in the project were awarded certificates of appreciation for their effort. The results of the project will be useful in future policy initiatives regarding oral healthcare of seafarers. How to cite this article Mahdi SS, Mancini M, Sibilio F, Amenta F. Research Questionnaire on Perception of Seafarers about Oral Hygiene and Oral Dietary Habits. World J Dent 2015;6(1):1-4.
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Sun, Mo Lin, e Zhong Yi Zheng. "Risk Age of Passenger Ships Based on Port State Control Data". Advanced Materials Research 945-949 (junho de 2014): 2939–43. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.2939.
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In order to understand the relationship between passenger ship age and risk condition of the passenger ship deeper, the concept of ship risk age is proposed based on the passenger ships’ data in port state control referring to the concept of physiological age from the physiological point of view. The risk evaluation index system of passenger ships is built and low risk passenger ships’ information are obtained based on the Paris-MOU risk evaluation model by cluster analysis of K-means under the general classification principle’s guidance. Risk age of passenger ships is estimated by regression analysis of the ship actual age and risk evaluation indexes through ε-SVR regression model, which provides a thought and basis for the management of old ships.
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Zhao, Xingya, Yixiong He, Liwen Huang, Junmin Mou, Ke Zhang e Xiao Liu. "Intelligent Collision Avoidance Method for Ships Based on COLRGEs and Improved Velocity Obstacle Algorithm". Applied Sciences 12, n.º 18 (6 de setembro de 2022): 8926. http://dx.doi.org/10.3390/app12188926.
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Collision prevention is critical for navigational safety at sea, which has developed rapidly in the past decade and attracted a lot of attention. In this article, an improved velocity obstacle (IVO) algorithm for intelligent collision avoidance of ocean-going ships is proposed in various operating conditions, taking into count both a ship’s manoeuvrability and Convention on the International Regulations for Preventing Collisions at Sea (COLREGs). An integrated model combines a three-degree-of-freedom manoeuvring model with ship propeller characteristics to provide a precise prediction of ships in various manoeuvring circumstances. In the given case, what is different to present studies, this improved algorithm allows for decision-making in two ways: altering course and changing speed. The proposed technique is demonstrated in a variety of scenarios through simulation. The findings reveal that collision-avoidance decision-making can intelligently avoid collisions with the target ships (TSs) in multi-ship situations.
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Palucka, Tim. "Iceberg Ships". MRS Bulletin 25, n.º 8 (agosto de 2000): 101–2. http://dx.doi.org/10.1557/mrs2000.156.
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Frenkel, Ilia, Igor Bolvashenkov, Lev Khvatskin e Anatoly Lisnianski. "The Lz-Transform Method for the Reliability and Fault Tolerance Assessment of Norilsk-Type Ship’s Diesel-Geared Traction Drives". Transport and Telecommunication Journal 19, n.º 4 (1 de dezembro de 2018): 284–93. http://dx.doi.org/10.2478/ttj-2018-0023.
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Abstract This paper focuses on a comparative analysis of the most important parameters of an icebreaker ship’s sustainable operations: the operational availability, power performance and power performance deficiency of the multi-state Multi-Power Source Traction Drives of Norilsk-type Arctic icebreaker ships. These parameters have a significant impact on the correct choice of the propulsive system of icebreaking vessels. The parameters’ evaluation was based on statistical operational data on Arctic icebreaker ships with diesel-geared traction drive. The Lz-transform approach was used to arrive at a solution of that problem. This approach drastically simplifies the solution compared with the straightforward Markov method.
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Ingle, Suraj. "Ship Operational Efficiency from AIS Data Using Big Data Technology". International Journal for Research in Applied Science and Engineering Technology 10, n.º 1 (31 de janeiro de 2022): 89–97. http://dx.doi.org/10.22214/ijraset.2022.39781.
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Abstract: The Energy Efficiency Design Index (EEDI) is a necessary benchmark for all new ships to prevent pollution from ships. MARPOL has also applied the Ship Energy Efficiency Management Plan (SEEMP) to all existing ships. The Energy Efficiency Operational Indicator (EEOI) provided by SEEMP is used to measure a ship's operational efficiency. The shipowner or operator can make strategic plans, such as routing, hull cleaning, decommissioning, new construction, and so on, by monitoring the EEOI. Fuel Oil Consumption is the most important factor in calculating EEOI (FOC). It is possible to measure it when a ship is in operation. This means that the EEOI of a ship can only be calculated by the shipowner or operator. Other stakeholders, such as the shipbuilding firm and Class, or those who do not have the measured FOC, can assess how efficiently their ships are working relative to other ships if the EEOI can be determined without the real FOC. We present a method to estimate the EEOI without requiring the actual FOC in this paper. The EEOI is calculated using data from the Automatic Identification System (AIS), ship static data, and publicly available environmental data. Big data technologies, notably Hadoop and Spark, are used because the public data is huge. We test the suggested method with real data, and the results show that it can predict EEOI from public data without having to use actual FOC Keywords: Ship operational efficiency, Energy Efficiency Operational Indicator (EEOI), Fuel Oil Consumption (FOC), Automatic Identification System (AIS), Big data
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Marhanto, Eka Dharma, e Anry Hariadhin Depu. "Sanitation And Temperature Factors Related To Existence Of Cockroach And Rats Vectors On Passenger Ship In Kendari City Port". INDONESIAN JOURNAL OF HEALTH SCIENCES RESEARCH AND DEVELOPMENT (IJHSRD) 4, n.º 2 (26 de dezembro de 2022): 57–69. http://dx.doi.org/10.36566/ijhsrd/vol4.iss2/132.
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Objectives: Ship arrival and departure activities have an important influence on the transmission of various vectors which have the potential to infect the ship's crew and passengers. This study aims to determine the factors associated with the presence of vectors on passenger ships. Methods: This type of research is observational. The population is a local passenger ship that anchors at 4 ports in Kendari City, with a population of 44 ships and a sample of 40 ships.with the sampling technique is systematic random sampling. Results: The results of the study used the Chi Square test between sanitary conditions and the presence of cockroaches (15.708>3.841), there was a relationship between sanitary conditions and the presence of rats (14.249>3.841), there was a relationship between temperature and the presence of cockroaches (9.724>3.841), there was a relationship between temperature and the presence of rats (7.901>3.841). Conclusion: There were relationship between sanitary conditions and temperature with the presence of cockroach and rat vectors on passenger ships mooring at the Port of Kendari City. Therefore it is necessary to increase the sanitary conditions and temperature in the room.
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Karetnikov, Vladimir, Anatoly Burkov, Andrei Prokhorenkov e Konstantin Efimov. "Fundamentals of training navigators of ships flying foreign flags when entering the inland waterways of the Russian Federation". E3S Web of Conferences 363 (2022): 01029. http://dx.doi.org/10.1051/e3sconf/202236301029.
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Navigation on inland waterways, such as rivers, canals, fairways via reservoirs and lakes is performed under conditions of a minimum under the keel clearance, hydrodynamic interaction between the ship's hull and underwater limits of the fairway, and the impact of irregular currents. Piloting a ship difficult navigational conditions requires the navigator to monitor continuously the ship’s motion, assess quickly the situation and develop optimal decision for ship handling, have sufficient navigational experience and a large amount of practical knowledge. To achieve a high level of qualification, the training of navigators is carried out in several ways at once - general and particular pilotage, organization of navigation safety and the theoretical foundations of ship handling. Lack of theoretical or practical knowledge can lead to wrong assessment of navigation situation and therefore be considered as factor limiting passage of vessel and navigational safety. The article contains analysis of inland waterways navigation particulars as basis of training for navigators of ships flying foreign flags when entering the inland waterways of the Russian Federation to reduce influence of limiting factors and support the navigational safety.
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Fitzgerald, Richard J. "Maglevs for ships". Physics Today 63, n.º 6 (junho de 2010): 19. http://dx.doi.org/10.1063/1.4796280.
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Damastuti, Natalia, Aulia Siti Aisjah e Agoes Masroeri. "Vessel Classifying and Trajectory Based on Automatic Identification System Data". IOP Conference Series: Earth and Environmental Science 830, n.º 1 (1 de setembro de 2021): 012049. http://dx.doi.org/10.1088/1755-1315/830/1/012049.
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Abstract Nowadays, the development of the of Automatic Identification System (AIS) device has continuously increased. It was initially used to send information on the whereabouts of ships to avoid collisions, but with stored data, it is used for monitoring waters. Therefore, this study was carried out using AIS data to classify ships in Indonesian waters. Based on features such as length, width, and weight, it classified them into 9 types of vessels. The data mining process was used to characterize each type with the ensemble method. Furthermore, data processing was carried out to determine the ship’s trajectory pattern. In this study, 80% of training data was used while the rest were testing data. The results showed that an accuracy value of 99.8% was obtained with a Root Mean Square Error (RMSE) value of 0.12.
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Damastuti, Natalia, Aulia Siti Aisjah e Agoes Masroeri. "Vessel Classifying and Trajectory Based on Automatic Identification System Data". IOP Conference Series: Earth and Environmental Science 830, n.º 1 (1 de setembro de 2021): 012049. http://dx.doi.org/10.1088/1755-1315/830/1/012049.
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Abstract Nowadays, the development of the of Automatic Identification System (AIS) device has continuously increased. It was initially used to send information on the whereabouts of ships to avoid collisions, but with stored data, it is used for monitoring waters. Therefore, this study was carried out using AIS data to classify ships in Indonesian waters. Based on features such as length, width, and weight, it classified them into 9 types of vessels. The data mining process was used to characterize each type with the ensemble method. Furthermore, data processing was carried out to determine the ship’s trajectory pattern. In this study, 80% of training data was used while the rest were testing data. The results showed that an accuracy value of 99.8% was obtained with a Root Mean Square Error (RMSE) value of 0.12.
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Wu, Qing, Tengfei Wang, Mihai A. Diaconeasa, Ali Mosleh e Yang Wang. "A Comparative Assessment of Collision Risk of Manned and Unmanned Vessels". Journal of Marine Science and Engineering 8, n.º 11 (29 de outubro de 2020): 852. http://dx.doi.org/10.3390/jmse8110852.
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It is expected that the prototypes of unmanned merchant ships will be deployed in the next few years. However, there is no specific research on whether the introduction of unmanned ships will reduce the risk of ship collision accidents in which communication between vessels is critical. This work constitutes an attempt to bridge the gap identified above by applying the Hybrid Causal Logic (HCL) methodology to model general-level collision scenarios of unmanned ships. The HCL methodology has been selected for its proven applicability to risk assessments, even when empirical data may be insufficient. Collision scenarios involving unmanned ships have been created in which manned ships of the conventional collision scenario HCL model are replaced with unmanned ships. Then, collision scenarios capturing the interactions between a manned ship and an unmanned ship were modeled. By comparing the qualitative and quantitative results of the different scenarios, we can see that the introduction of unmanned ships may effectively reduce the occurrence of ship collision accidents.
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Camelia, A. Indah, e Athyra Elmilla. "Tantangan Hukum dalam Pemanfaatan Maritime Autonomous Surface Ship (MASS)". Media Iuris 5, n.º 1SpecialIssue (1 de dezembro de 2022): 1–20. http://dx.doi.org/10.20473/mi.v5i1specialissue.42296.
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Technology development in the maritime industry led to the point where we now have unmanned ships run by automated systems. Therefore, (unmanned) crewless ships that were once only science fiction become real. Maritime Autonomous Surface Ships (MASS) have existed since world war two, and they develop by then. The existence of Maritime autonomous surface ships (MASS) has opened doors to new opportunities and enormous economic benefits for the maritime industry. Even though it will be run in automatic mode, the ship will still be monitored on land by the Shore Control Centre (SCC). This research will describe the aspects of definition, practice, the rule of law, and the use of MASS for seafarers and the maritime industry in general. While maritime regulation has not anticipated this magnitude before, thus not yet fully prepared to accommodate partially or fully automated ships. Consequently, A maritime legal regime still needs to ensure that MASS is safe and can be used sustainably.
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Anonymous. "Research ships upgraded". Eos, Transactions American Geophysical Union 70, n.º 14 (1989): 211. http://dx.doi.org/10.1029/89eo00114.
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Pokusaev, Mikhail Nikolaevich, Maxim Michailovich Gorbachev e Artem Maksimovich Gorbachev. "Cost-effectiveness of ships torsional vibrations monitoring systems application". Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2024, n.º 1 (29 de fevereiro de 2024): 64–71. http://dx.doi.org/10.24143/2073-1574-2024-1-64-71.
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A torsional vibration monitoring system is being investigated, and an assessment of the economic efficiency of its implementation on ships is made. A schematic diagram of the torsional vibration monitoring system is illustrated and a photograph of an experimental sample of the monitoring system is provided. An assessment of the economic efficiency of the implementation of torsional vibration monitoring systems on ships is being carried out to prevent the occurrence of emergency situations with marine propulsion systems. The rules of classification societies, scientific and technical literature in the field of torsional oscillations and industrial economics, and the authors' own research were used as materials. The methods used are analysis and computational experiment. Data on the economic costs of the shipowner in the event of emergency situations in case of fatigue failures of elements of ship's engine and propulsion systems were obtained. An assessment of the costs for the development, installation and maintenance of a torsional vibration monitoring system on ships was made; as well as an approximate assessment of the volume of the Russian domestic market for installation and maintenance of torsional vibration monitoring systems on ships. It is noted that the cost of the consequences of propeller shaft failures ranges from several million to tens of millions of rubles. It is concluded that the development and implementation of torsional vibration monitoring systems will reduce the cost of the shipowner for a routine assessment of the technical condition of torsional vibration dampers and reduce the risks of costly accidents with shipboard engine complexes.
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Yoshida, Takero, e Kazuo Ouchi. "Detection of Ships Cruising in the Azimuth Direction Using Spotlight SAR Images with a Deep Learning Method". Remote Sensing 14, n.º 19 (20 de setembro de 2022): 4691. http://dx.doi.org/10.3390/rs14194691.
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Spotlight synthetic aperture radar (SAR) achieves a high azimuth resolution with long integration times. Meanwhile, the long integration times also cause defocused and smeared images of moving objects such as cruising ships This is a typical imaging mechanism for moving objects in Spotlight SAR images. Conversely, ships can be classified as stationary or moving from the amount of smearing, and this classification method is, in general, based on manual observation. This paper proposes an automatic method for detecting cruising ships using deep learning known as the “You Only Look Once (YOLO) v5 model”, which is one of the frameworks of the YOLO family. In this study, ALOS-2/PALSAR-2 L-band Spotlight SAR images over the waters around the Miura Peninsula, Japan, were analyzed using the YOLO v5 model with a total of 53 ships’ images and compared with Automatic Identification System (AIS) data. The results showed a precision of approximately 0.85 and a recall rate of approximately 0.89 with an F-measure of 0.87. Thus, sufficiently high values were achieved in the automatic detection of moving ships using the deep learning method with the YOLO v5 model. As for false detections, images of breakwaters were classified as ships cruising in the azimuth direction. Further, range moving ships were found to be difficult to detect. From the present preliminary study, it was found that the YOLO v5 model is limited to ships cruising predominantly in the azimuth direction.
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Терентьев, В. А. "РОЗРОБКА АЛГОРИТМУ ЗАГАЛЬНОЇ СТРАТЕГІЇ АВТОМАТИЗАЦІЇ ВИБОРУ КУРСУ УХИЛЕННЯ СУДНА". Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 154, n.º 1 (13 de dezembro de 2021): 19–33. http://dx.doi.org/10.30857/1813-6796.2021.1.2.
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During ships maneuvering, the main cause of accidents is that navigators do not always objectively assess the situation and may make wrong decisions on the identification situation of a dangerous approach and a collision hazard. The automation of the deviation course choice is considered as the automation avoidance process. Purpose. The article highlights the tasks of formalizing the deviation course as a value of automatic control, and proposes the development of an algorithm for the strategy of changing the course. Methodology. Conducted processing of practical data of own vessel. The existing models of the ship's movement were analyzes, as well as the systems for the automatic stabilization of the ship. To construct the algorithm, the COLREGs–72 was decomposed with respect to the belonging of the initial situation of the vessels to one of the areas of mutual obligations. Findings. According to the results of the given theme, an algorithm of the general strategy of choosing the course of evasion of the vessel was developed, considering the requirements of COLREG–72 rules. It were considered the types of control of automatic regulators and their limitations at the initial and final moments of the ship's turn. It was found out. It is necessary to create a multilevel mathematical description, which will include subsystems of different levels, to build a model of an integrated control system. Originality. It was determined the efficiency of using the principle of execution of ship’s turns by the method of observation with a given influence by analyzing the existing models of ship’s movement. It was offered to use the range of acceptable values of courses during the development of the model of automation ship avoidance process. Practical value. An algorithm for the general strategy of automation of the avoidance course selection was developed.
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Mitrofan, Alexandru, Andreea Mandru e Florin Pacuraru. "Study on the position of the bow spray rail of a patrol vessel". Analele Universităţii "Dunărea de Jos" din Galaţi Fascicula XI Construcţii navale/ Annals of "Dunărea de Jos" of Galati Fascicle XI Shipbuilding 46 (4 de dezembro de 2023): 183–88. http://dx.doi.org/10.35219/annugalshipbuilding/2023.46.23.
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Modern patrol ships characterised by an 'axe bow' shape allows the placement of an anti-spray rail. These not only reduce drag but also minimize the wave height generated by the ship's bow. This article will present the effect of positioning of an anti-spray rail at various heights on the ship's bow to reduce drag resistance. The most favorable placement scenario will be determined through the results of numerical simulations conducted by using the commercial software Fidelity Fine Marine.
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Nguyen, Huy Vu, e Quang Thang Do. "Dynamic impact response and residual strength of container ship under dropped object". IOP Conference Series: Earth and Environmental Science 1278, n.º 1 (1 de dezembro de 2023): 012020. http://dx.doi.org/10.1088/1755-1315/1278/1/012020.
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Abstract This study aims to present numerical investigations on container ships’ residual longitudinal ultimate strength subjected to dropped container collisions. First, the commercial software ABAQUS was applied. The accuracy and reliability of the proposed numerical analyses were established by comparing the numerical results with the experimental results. Next, parametric studies were carried out on actual container ships to assess the degree of loss of the ship’s longitudinal strength in two dangerous situations a ship sagging and hogging. The effects of parameters including drop heigh and impact angles on the ultimate longitudinal strength of the ship have been investigated. The results present in this study can be applied to predict the residual longitudinal strength of dropped container collisions on a container ship. It is also useful for the initial design stage of ship structures in case of collision incidents.
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Susanto, Novi Tri, Erika Buchari e Edi Kadarsa. "Analisis Waktu Pelayanan Kapal di Pelabuhan Penyeberangan Tanjung Api-Api". Jurnal Rekayasa Sipil dan Lingkungan 5, n.º 1 (30 de julho de 2021): 15. http://dx.doi.org/10.19184/jrsl.v5i1.25038.
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The Ferry Port of South Sumatra Province is located in Tanjung Api-Api, Banyuasin Regency. This port connects to the Port of Tanjung Kelian – Muntok, Province of the Bangka Belitung Islands. Problems that often occur in the management and operation of the Tanjung Api-Api ferry port are service performance problems that cause ineffective port management due to low service and the occurrence of queues of ships to lean on and carry out loading and unloading activities because they have to wait for ships that have not finished doing the activity on the pier. So that it causes complaints and dissatisfaction of service users with crossing transportation services. This paper is intended to analyze the service time of ships at the port by calculating the average time of raising and lowering passengers and vehicles as well as the average time of maneuvering ships docking and leaving the port pool, as well as adding the variables of opening and closing times for ramps and processing time for approval letters. The sail has not been added by previous researchers. Then the calculation results are compared with the service time that has been set at the Tanjung Api-Api ferry port. The results of the study the average service time of ships at the Tanjung Api-Api ferry port is 121.175 minutes/ship. The ship's service time exceeds the ship's service time that has been set at the port, which is 120 minutes/ship.
Abstrak
Pelabuhan Angkutan Penyeberangan Provinsi Sumatera Selatan terletak di Tanjung Api-Api Kabupaten Banyuasin. Pelabuhan ini menghubungkan ke Pelabuhan Tanjung Kelian - Muntok Provinsi Kepulauan Bangka Belitung. Permasalahan yang sering terjadi dalam pengelolaan dan penyelenggaraan di pelabuhan penyeberangan Tanjung Api-Api adalah masalah kinerja pelayanan yang menyebabkan pengelolaan pelabuhan yang tidak efektif dikarenakan rendahnya pelayanan dan terjadinya antrian kapal untuk bersandar dan melakukan kegiatan bongkar muat, karena harus menunggu kapal yang belum selesai melakukan aktivitas di dermaga. Sehingga menimbulkan keluhan dan ketidak puasan pengguna jasa terhadap pelayanan angkutan penyeberangan. Paper ini dimaksudkan untuk menganalisis waktu pelayanan kapal di pelabuhan dengan menghitung waktu rata-rata menaikkan dan menurunkan penumpang dan kendaraan serta waktu rata-rata manuver kapal merapat dan keluar dari kolam pelabuhan, serta menambahkan variabel waktu buka dan tutup pintu rampa serta waktu pengurusan surat persetujuan berlayar yang belum ditambahkan oleh peneliti sebelumnya. Kemudian hasil perhitungan dibandingkan dengan waktu pelayanan yang telah ditetapkan di pelabuhan penyeberangan Tanjung Api-Api. Hasil penelitian rata-rata waktu pelayanan kapal di pelabuhan penyeberangan Tanjung Api-Api sebesar 121,175 menit/ kapal. Waktu pelayanan kapal tersebut melebihi waktu pelayanan kapal yang telah ditetapkan di pelabuhan yaitu 120 menit/kapal.
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Wang, Jiantao, Bochen Jiang e Yunlong Guo. "Strength Evaluation Method of Container Ships Based on the Ion Corrosion". Nanoscience and Nanotechnology Letters 12, n.º 2 (1 de fevereiro de 2020): 235–44. http://dx.doi.org/10.1166/nnl.2020.3092.
Texto completo da fonteResumo:
In order to solve the problem that the accuracy of strength performance of container ships is not high, the strength evaluation method of container ships is optimized based on the principle of ion corrosion. By collecting and analyzing the strength characteristic values of container ships, the evaluation grade standard of strength performance is divided, which simplifies the performance evaluation steps of container ships and accurately evaluates the strength performance of container ships. Finally, compared with the traditional method, the strength evaluation method of container ships under the action of ion corrosion has higher accuracy and fully meets the research requirements.