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1
Premur, Vitomir, Aleksandra Anić Vučinić, Ivana Melnjak, and Lucija Radetić. "Challenges and possibilities for environmentally sound recycling of ships and composite boats in European union." Holistic approach to environment 9, no. 2 (June 24, 2019): 35–43. http://dx.doi.org/10.33765/thate.9.2.3.
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In this paper are presented challenges that countries of European Union face when recycling ships and composite boats. European ship owners control over 40 % of the world’s merchant ship fleet, with Greece as the top ship-owning country globally. Nowadays, ship recycling is being regulated and positive progression was made towards it since steel industry belongs in world’s top five and stable market and makes recycling of scrap metals from ships attractive. On the other hand, yachts, sailing boats and small boats are mainly made from composite materials because of their favourable properties, making them great investment, but end-of-life management is more complicated and not quite regulated by the law yet. Unlike commercially oriented ships, which are constantly in move and disposed when the maintenance costs of the vessel start to exceed possible revenue, old boats for recreational and tourism-oriented purposes most rarely move. Hundreds of thousands lie in marinas and are abandoned due to the maintenance costs thus discouraging the owners from keeping it. Hence, a growing number of marinas worldwide will have the problem of boat disposal in a sustainable way in the future. In this paper is given short summary on waste ships and boats management issues. The emphasis is on waste management of small composite boats
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Wilke, André B. B., Chalmers Vasquez, Augusto Carvajal, Maday Moreno, William D. Petrie, and John C. Beier. "Mosquito surveillance in maritime entry ports in Miami-Dade County, Florida to increase preparedness and allow the early detection of invasive mosquito species." PLOS ONE 17, no. 4 (April 15, 2022): e0267224. http://dx.doi.org/10.1371/journal.pone.0267224.
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Invasive mosquito vector species have been inadvertently transported to new areas by humans for decades. Strong evidence supports that monitoring maritime, terrestrial, and aerial points of entry is an essential part of the effort to curb the invasion and establishment of invasive vector mosquito species. Miami-Dade County, Florida is an important operational hub for the cruise ship industry and leisure boats that routinely visit nearby areas in the Caribbean, and freight cargo ships transporting goods from Miami-Dade to Caribbean countries and vice versa. To deal with the increasing public health concern, we hypothesized that mosquito surveillance in small- and medium-sized maritime ports of entry in Miami-Dade is crucial to allow the early detection of invasive mosquito species. Therefore, we have selected 12 small- and medium-sized maritime ports of entry in Miami-Dade County with an increased flow of people and commodities that were not covered by the current mosquito surveillance system. Collection sites were comprised of two distinct environments, four marinas with international traffic of leisure boats, and eight maintenance and commercial freight cargo ship ports. Mosquitoes were collected weekly at each of the 12 collection sites for 24 hours for 6 weeks in the Spring and then for 6 additional weeks in the Summer using BG-Sentinel traps. A total of 32,590 mosquitoes were collected, with Culex quinquefasciatus and Aedes aegypti being the most abundant species totaling 19,987 and 11,247 specimens collected, respectively. Our results show that important mosquito vector species were present in great numbers in all of the 12 maritime ports of entry surveyed during this study. The relative abundance of Cx. quinquefasciatus and Ae. aegypti was substantially higher in the commercial freight cargo ship ports than in the marinas. These results indicate that even though both areas are conducive for the proliferation of vector mosquitoes, the port area in the Miami River is especially suitable for the proliferation of vector mosquitoes. Therefore, this potentially allows the establishment of invasive mosquito species inadvertently brought in by cargo freights.
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Agarwal, Arpit, Scott Fenical, Kirsten McElhinney, Paul Carangelo, and David Krams. "ANALYSIS OF HIGH FREQUENCY BREAKING WAVES AND LOW FREQUENCY SURGES GENERATED IN HARBORS DUE TO PASSAGE OF DEEP-DRAFT TANKERS." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 27. http://dx.doi.org/10.9753/icce.v36.waves.27.
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Cline’s Point Marina, located in Port Aransas, TX, has been experiencing detrimental conditions near the marina’s entrance and within the marina itself during the passage of deep-draft ship traffic. The wave activity is primarily generated by pressure field effects from large, laden outbound vessels in Corpus Christi Ship Channel (CCSC). The basin was originally protected by an approximately 180 ft. long breakwater constructed in 1976 on the west side of the entrance which by 1980 has deteriorated and partially failed to 120 ft. long breakwater and continued deteriorating over time, reaching its approximate 60 ft. long current condition by 2003. The deterioration of this breakwater has reportedly resulted in enhanced penetration of deep-draft vessel wave activity into the marina (Figure 1). Mott MacDonald (MM) evaluated the mechanisms by which waves are generated in the navigation channel, transform, and enter the harbor, quantified the level of protection afforded by past and present entrance breakwater configuration(s), and developed conceptual alternatives for improving conditions inside the marina.
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Ibadullaev, Adel Damirovich, Konstantin Olegovich Sibryaev, and Aleksandr Sergeevich Stukalov. "Analyzing operability of silicone dampers of torsional vibrations in marine internal combustion engines based on results of Testing Center Marine Technology Service." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 3 (August 23, 2022): 60–68. http://dx.doi.org/10.24143/2073-1574-2022-3-60-68.
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The article presents the analysis results of changes in the operability of silicone dampers of torsional vibrations of marine diesel engines on the basis of practical measurements carried out by the Testing Center Marine Technology Service under the Astrakhan State Technical University (TC MTS). TC MTS is accredited by the Russian classification society - the Russian Maritime Register of Shipping (RMRS) in the field of calculation and measurement of torsional vibrations. During its functioning (2001 – to date) the TC MTS has conducted torsiographing procedures of the machine-propulsion systems (MPS) of more than 200 vessels. The large amount of data obtained makes it possible to assess the dynamics of changes in the parameters of torsional vibrations, including amplitude and frequency, according to the results of periodic torsiographing the ship MPS. A change in the technical condition of the torsional vibration damper (a decrease in the efficiency of its operation) and the lack of its constant monitoring lead to the increasing stresses in the ship shaft line and, as a result, to a growing risk of its breakdown, which confirms the urgency of the study. There are given the images as real examples of ship operation failure: Aratere ship shaft fracture, damper mass wedging due to silicone fluid leakage, silicone fluid viscosity increasing to suspension state due to wear products, wear of silicone damper flyweight surfaces, silicone damper body wear. The Hasse & Wrede damper cap fastening with bolts is illustrated.
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Son, Myeong-Jo, Hyungwoo Kang, and Tae-Wan Kim. "AVEVA Marine Scheme-based Modeling for Reuse of Ship Hull Block Model." Transactions of the Society of CAD/CAM Engineers 19, no. 1 (March 1, 2014): 41–49. http://dx.doi.org/10.7315/cadcam.2014.041.
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Sugeng, Sunarso, Mohammad Ridwan, Suharto Suharto, and Samuel Febriary Khristyson. "Technical and Economic Analysis of Ship Launching with Slipway and Airbag KM. Sabuk Nusantara 72 in PT. Janata Marina Indah Shipyard Semarang." TEKNIK 41, no. 3 (November 30, 2020): 225–31. http://dx.doi.org/10.14710/teknik.v41i3.33710.
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In a ship planning can not be separated from the planning of the ship launching process. A ship can glide perfectly if it has a high enough planning time and costs. The launch process itself is divided into several ways. The choice of this method needs to be considered because it relates to the budget and preparations made. The method used is the calculation according to the numerical approach assisted by computational software. In the first calculation it is planned with the slipway launch, and then the next one is planned with the airbags that have been implemented previously. The purpose of this study is to provide analysis results as a consideration in implementing the slipway and airbag ship launching method on KM ships. Belt Nusantara 72 measuring 2000 DWT. In steps 5 to 6, both the slipway and the airbags experience a stern lift condition with a value (yVd) of 1396.97 ton. Based on the economic analysis of the hours of people using airbags, there is a decrease in working hours by 44% when compared to the launch using a slipway. This also happened to work productivity where it was 84% more time effective. When viewed from an investment point of view, the use of slipways is actually more economical than airbag, the difference is 43% more economical using slipways. Both types of launch can be applied by looking at the economical side and the ability of each shipyard in carrying out the launching process and seeing the main size of the ship to be launched.
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Arifin, Wais, Ahmad Fitriansyah, and Dedi Setiadi. "PEMBATASAN AKSES SECARA FISIK DENGAN SISTEM FINGERPRINT DOORLOCK MENGGUNAKAN MICROCONTROLLER ARDUINO UNO R3." JEIS: JURNAL ELEKTRO DAN INFORMATIKA SWADHARMA 2, no. 2 (July 28, 2022): 81–88. http://dx.doi.org/10.56486/jeis.vol2no2.234.
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This study aims to produce a prototype tool that can be used as a limitation of access to employee workspaces as part of improving internal control. The current problem, PT. Trijaya Global Marindo is a company engaged in sea transportation services. Every day many applicants or ship crews come to the office, so that many people pass in and out of the room, especially between the main door/office living room and the employee's room door, which currently has no security access installed. This causes someone other than the employee to leave the employee's room freely. The absence of these access restrictions can increase vulnerability to stealing goods or company data by outsiders. The method that will be used in this research is the Research & Development (R&D) method with data collection using field studies by observing the traffic of people at PT. Trijaya Global Marindo and analyzed the determinants of the installation point of the access restriction prototype. The results of the study were a prototype of an automatic door locking system using a fingerprint sensor FPM10A and Arduino Uno R3 which had passed the test using 20 fingerprint samples from 10 employees. After the prototype has succeeded in reading the recorded fingerprint, the door can be opened, for fingerprints that have not been recorded, the door remains locked
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Sakhno, Konstantin Nickolaevich, Manh Do Tat, Hoang Bui Sy, Vladimir Muratovich Tsaloev, Peyvand Ahmad Saadati, Fedor Aleksandrovich Lapeko, and Tuyen Vu Van. "Solutions to enhance technology in the fabrication process and installation of marine pipelines." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 4 (November 30, 2021): 17–26. http://dx.doi.org/10.24143/2073-1574-2021-4-17-26.
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The article describes possible solutions of the problem connected with shortening shipbuilding construction time as well as reducing production costs. To reduce the total amount of labour involved in the manufacture and installation of ship piping systems, which is 20% compared to the total labour volume of shipbuilding, authors provide the research on the possibility of manufacturing straight pipe sections with permissible deviations in combination with free flanges, analysis of deviation compensation for pipelines through the use of straight pipe sections manufactured with permissible tolerance and proposing new theoretical solutions to improve manufacturing and installing ship piping systems. Introduction of these technologies contributes to reduction of cycles of building and decrease in labour-intensiveness of pipeline works when carrying out marine orders. The chart of modeling the system of pipelines is presented. A straight pipe manufactured with an allowable deflection on a flat support and a loose flange attached to the end of the welded pipe are shown. The scheme of a permissible deviation α at mounting the connections between pipes is considered. The possibility of assembling curved pipelines using straight pipe sections is described in detail. The compensation zone is illustrated using the rotation of two pairs of deflected straight pipes. A block diagram of the application of research results in manufacturing and mounting a pipeline system has been developed
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Ramalhosa, Patrício, Alfonso Nebra, Ignacio Gestoso, and João Canning-Clode. "First record of the non-indigenous isopods Paracerceis sculpta (Holmes, 1904) and Sphaeroma walkeri Stebbing, 1905 (Isopoda, Sphaeromatidae) for Madeira Island." Crustaceana 90, no. 14 (2017): 1747–64. http://dx.doi.org/10.1163/15685403-00003727.
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While exploring the presence of non-indigenous fouling species colonizing settlement plates deployed in local marinas in Madeira Island (north-eastern Atlantic Ocean), two non-indigenous species (NIS) of free-swimming crustaceans,Paracerceis sculpta(Holmes, 1904) andSphaeroma walkeriStebbing, 1905 (Isopoda: Sphaeromatidae), were detected.Paracerceis sculptais native to the Pacific Coast of North and Central America and has been introduced into many other regions worldwide.Sphaeroma walkeriis native to the northern Indian Ocean and nowadays is considered one of the most widely ship-transported species globally. Both species were collected in the marina of Funchal, Madeira Island, Portugal, during monitoring surveys in 2015. Moreover, several specimens ofS. walkeriwere also found in a foreign recreational yacht hull, during a dry dock inspection. These findings suggest that hull fouling is a significant vector for the introductions of marine invertebrates into the Madeira island system.
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Talley, L. D., R. A. Feely, B. M. Sloyan, R. Wanninkhof, M. O. Baringer, J. L. Bullister, C. A. Carlson, et al. "Changes in Ocean Heat, Carbon Content, and Ventilation: A Review of the First Decade of GO-SHIP Global Repeat Hydrography." Annual Review of Marine Science 8, no. 1 (January 3, 2016): 185–215. http://dx.doi.org/10.1146/annurev-marine-052915-100829.
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Claustre, Hervé, Kenneth S. Johnson, and Yuichiro Takeshita. "Observing the Global Ocean with Biogeochemical-Argo." Annual Review of Marine Science 12, no. 1 (January 3, 2020): 23–48. http://dx.doi.org/10.1146/annurev-marine-010419-010956.
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Biogeochemical-Argo (BGC-Argo) is a network of profiling floats carrying sensors that enable observation of as many as six essential biogeochemical and bio-optical variables: oxygen, nitrate, pH, chlorophyll a, suspended particles, and downwelling irradiance. This sensor network represents today's most promising strategy for collecting temporally and vertically resolved observations of biogeochemical properties throughout the ocean. All data are freely available within 24 hours of transmission. These data fill large gaps in ocean-observing systems and support three ambitions: gaining a better understanding of biogeochemical processes (e.g., the biological carbon pump and air–sea CO2 exchanges) and evaluating ongoing changes resulting from increasing anthropogenic pressure (e.g., acidification and deoxygenation); managing the ocean (e.g., improving the global carbon budget and developing sustainable fisheries); and carrying out exploration for potential discoveries. The BGC-Argo network has already delivered extensive high-quality global data sets that have resulted in unique scientific outcomes from regional to global scales. With the proposed expansion of BGC-Argo in the near future, this network has the potential to become a pivotal observation system that links satellite and ship-based observations in a transformative manner.
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Okay, O. S., B. Karacık, A. Güngördü, M. Ozmen, A. Yılmaz, N. C. Koyunbaba, S. D. Yakan, V. Korkmaz, B. Henkelmann, and K. W. Schramm. "Micro-organic pollutants and biological response of mussels in marinas and ship building/breaking yards in Turkey." Science of The Total Environment 496 (October 2014): 165–78. http://dx.doi.org/10.1016/j.scitotenv.2014.07.035.
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Gjerdrum, Carina, and François Bolduc. "Non-Breeding Distribution of Herring Gull (Larus argentatus) and Great Black-Backed Gull (Larus marinus) in Eastern Canada from Ship-Based Surveys." Waterbirds 39, sp1 (April 2016): 202–19. http://dx.doi.org/10.1675/063.039.sp119.
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Oleynik, Maria. "Visual Representation of the Marine Theme in the Artistic Culture of Russia (XVIII–XX Centuries)." Ideas and Ideals 14, no. 2-2 (June 27, 2022): 350–62. http://dx.doi.org/10.17212/2075-0862-2022-14.2.2-350-362.
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Тhe meaning of visual representation includes perception of information through the visual image. This form of information delivery to the general public was known in pagan cultures and asserted itself in Christianity. Since the late 20th century the concept of visualization united in itself not only religious and artistic images, but also the vision of mass culture. The performed research places emphasis on the establishment and the development of visual representation in Russia’s art culture of the ХVIII-XIX centuries. During the reign of Peter the Great, in a succession of state reforms and due to the influence of samples of European art, a transformation of national art culture occured. In this context, maritime art is viewed as one of the visual representation forms. The seascape, as a separate genre of painting, originates in the Dutch landscape. The first marinas were brought by Peter the 1st to decorate palaces and country residences. The victory in the Battle of Chesme (1770) and the joining of Crimea to the Russian Empire prompted Catherine the 2nd to invite J. P. Hackert to perpetuate the glory of Russian weapons. The artist became the first marine painter on Russian soil and performed a series of twelve paintings. The flourishing of the national seascape in Russia took place in the 19th century. The first who took the post of artist at the Ministry of the Sea was I.K. Aivazovsky. Since then the seascape acquired special significance and perpetuates the sea victories of Russia. A subtle metaphysical meaning is present in some romantic landscapes by I.K. Aivazovsky. Sea battle paintings acquired clear realistic features in the painting of A.P. Bogolyubov. The artists are concerned not only with the image of the sea, but also with the architecture of the ship, which forms a separate painting genre: the ship portrait genre. The image of the ship in the paintings of the XIX-XX centuries combines the lines of scripture and poetry, focusing the attention of the viewer on a deep semantic reading of the landscape.
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Gadasina, Lyudmila V., Anna Yu Vedernikova, and Maria V. Ivanova. "Web-service development for owners of small river transport in Saint Petersburg." Journal Of Applied Informatics 17, no. 1 (97) (January 30, 2022): 97–108. http://dx.doi.org/10.37791/2687-0649-2022-17-1-97-108.
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The geographical location and tourist features of St. Petersburg require a specialized web service for owners and tenants of river transport, aggregating all the information necessary for them. Currently, such information is available in various news sources, web portals and groups in social networks. The work presents a prototype of a service for small river transport users. Information needs and functional and requirements for it were identified during in-depth interviews with stakeholders of the project. The web service database is implemented in the PostgreSQL DBMS with the PostGIS extension. The work presents the structure of the service, which includes 10 pages, describes its main sections, such as current regulatory documents, news, interactive maps, reference information, as well as technical information about ships and restrictions on their movement due to technical characteristics. During its development, an analysis of existing solutions related to each section was carried out. During the "Maps" section development, an analysis of existing web tools for displaying interactive maps and the selection of the best solutions was carried out. Using the Google Maps designer, interactive maps were created for the web service being developed. The first of them is a map of the city's water bodies, containing such layers as: floating gas stations, lighthouses, customs, checkpoint and Ministry of Emergencies, private yacht clubs and marinas, berths and quayes, bridges, etc. The interactive weather map allows the user to get acquainted with the weather conditions, as well as their 5-day forecast. One of the priority functional requirements of the web service, called stakeholders, was the determination of water barriers and bridges that were inappropriate in the size of the vessel. The "Your Ship" section of the developed prototype web service offers a solution to meet this requirement. The developed web service is one of the favorable incentives for the development of the water tourism sphere and the use of river transport in St. Petersburg.
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ER, Zuhal, and Doguhan ATES. "Elektrikli Gemilerin Değerlendirilmesi ve Güneş Enerjisi İmkânıyla Birleştirilmiş Yeni Tasarımı Düşünülen Deniz Kabini." Deniz Taşımacılığı ve Lojistiği Dergisi, June 8, 2022. http://dx.doi.org/10.52602/mtl.1036256.
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Demands for energy saving and emission reduction, and due to the restrictions imposed by the authorities, as well as most of new designs in the maritime field is oriented towards renewable energy sources. Solar energy and energy storage systems may a solution to the pollution problems, reducing CO2, SOX and NOX emissions and improving the ship's energy efficiency. Battery technologies emerge as a promising method to increase it. In this study, the recent electric ship markets have been examined with these respects.
Furthermore, this study has aimed presentation of considered new design Electric Battery Sea Cab which is under aware of the requirements in practical applications. We believe that the sea cab as a public transportation or barge ship with the use of renewable energy sources will save emission of the harmful gases from the sea vehicles and the amount of energy consumed. In this project, the considered cab is 14,95 meters long and 4 meters wide. Considering the average resistance value for 16 knots speed, it has examined that the motor to be used should provide approximately 200 HP power. Studies obtained the possibility to produce a public transportation vehicle that is both environmentally friendly and less costly by using renewable energy systems for sea cab. Our evaluations provide that it is inevitable that the use of photovoltaic (PV) panels with 30 times less carbon footprint compared to fuel will become wide spread and be preferred to energies that can be consumed over time. Consequently, the results of this study also service that alternative in ship technology information on the use of energy systems is provided. In addition, the new considered cab which represents showing that battery electrical ship can be achieved shall be interesting to the future focuses of the representatives of the maritime sector.
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Gondikas, Andreas, Karin Mattsson, and Martin Hassellöv. "Methods for the detection and characterization of boat paint microplastics in the marine environment." Frontiers in Environmental Chemistry 4 (January 26, 2023). http://dx.doi.org/10.3389/fenvc.2023.1090704.
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Microplastics in the marine environment have been the focus of intense research recently, however little attention has been given to boat paint sources, despite its direct influence on the marine ecosystem. This is largely due to the lack of established analytical methods. Microplastics from boating sources may originate from antifouling paints on the underwater body, surface coatings on the top sides, deck, and superstructure, as well as plastic parts of the boat construction. Their release can occur during construction, operation (leisure boats and commercial ships), service, and maintenance, from the materials themselves or used chemicals (e.g., abrasive detergents). Most importantly, boat paint microplastics containing biocides, such as the metals copper and zinc, and particles containing tin (residues from old or current use of tributyl-tin ship hull paints) should raise higher concern on potential environmental impacts. This study aims to provide practical insight on methods for the quantification of boat paint microplastics in marine waters and provide a baseline survey on their occurrence. Sampling and analysis methods are applied on case studies, i.e., marinas on the Swedish coast. A multi-method approach for identifying and characterizing boat paint microplastics based on visual and chemical characteristics is presented. In general, the measured content of biocide-containing microplastics was remarkably high in all marinas, with concentration levels of copper-rich particles >10 μm between 400 and 1400 particles per L. Given that biocide paint particles are manufactured to be toxic, it is particularly important to take into account field measurements in future environmental status assessments. This work underlines the importance of monitoring data in the action work between relevant authorities and stakeholders.
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Riley, Cyrena, David Drolet, Jesica Goldsmit, Jaclyn M. Hill, Kimberly L. Howland, Marie-France Lavoie, Cynthia H. McKenzie, Nathalie Simard, and Christopher W. McKindsey. "Experimental Analysis of Survival and Recovery of Ship Fouling Mussels During Transit Between Marine and Freshwaters." Frontiers in Marine Science 8 (January 18, 2022). http://dx.doi.org/10.3389/fmars.2021.808007.
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Ships and boats may transport whole communities of non-indigenous species (NIS) through hull biofouling, some members of which may become invasive. Several studies have evaluated the diversity of these communities, but very few have analyzed the survival of organisms after their voyages into different and potentially inhospitable conditions. This factor is important to consider because the last port of call approach for risk assessments assumes that if the conditions observed in the last port of call are different from those observed in a receiving port, risks are diminished or null. Using an innovative experimental system, we tested the survival and recovery of the marine blue mussel (Mytilus edulis) and the freshwater zebra mussel (Dreissena polymorpha) by exposing them to adverse salinity conditions at varying temperatures to simulate ships and boats transiting to ports or marinas with contrasting environmental conditions. Both mussel species, which are well-known for their adaptability to new environments as aquatic NIS, survived better at colder temperatures, with blue mussels surviving up to 14 days in freshwater, and zebra mussels up to 8 days in marine water. This highlights the importance of considering the resistance of fouling organisms to adverse conditions in vector and species risk assessments.
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Yan, Lijuan, Nan Hui, Suvi Simpanen, Laura Tudeer, and Martin Romantschuk. "Simulation of Microbial Response to Accidental Diesel Spills in Basins Containing Brackish Sea Water and Sediment." Frontiers in Microbiology 11 (December 23, 2020). http://dx.doi.org/10.3389/fmicb.2020.593232.
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The brackish Baltic Sea is under diesel oil pollution risk due to heavy ship traffic. The situation is exasperated by densely distributed marinas and a vigorous although seasonal recreational boating. The seasonality and physical environmental variations hamper the monitoring of microbial communities in response to diesel oil spills. Hence, an 8-week simulation experiment was established in metal basins (containing 265 L sea water and 18 kg quartz sand or natural shore sand as the littoral sediment) to study the effect of accidental diesel oil spills on microbial communities. Our results demonstrated that microbial communities in the surface water responded to diesel oil contamination, whereas those in the littoral sediment did not, indicating that diesel oil degradation mainly happened in the water. Diesel oil decreased the abundance of bacteria and fungi, but increased bacterial diversity in the water. Time was the predominant driver of microbial succession, attributable to the adaption strategies of microbes. Bacteria were more sensitive to diesel oil contamination than fungi and archaea. Diesel oil increased relative abundances of bacterial phyla, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Flavobacteriia and Cytophagia, and fungal phylum Ascomycota in the surface water. Overall, this study improves the understanding of the immediate ecological impact of accidental diesel oil contamination, providing insights into risk management at the coastal area.
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HAZAR, Canberk. "DENİZ DİZEL MAKİNELERİ İÇİN GÜÇ TÜRBİNİ JENERATÖRÜNÜN TERMODİNAMİK ANALİZİ VE GERİ ÖDEME SÜRESİ ARAŞTIRMASI." Dokuz Eylül Üniversitesi Denizcilik Fakültesi Dergisi, April 13, 2021. http://dx.doi.org/10.18613/deudfd.881570.
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Because of the heat flow and temperature, marine diesel engine exhaust gas energy is by far the highest desirable among the waste heat sources of a ship. Waste heat recovery systems generate electrical power by using this exhaust gas energy. The goal of this study is to measure how much the power turbine generator improves the system's efficiency for 3 different engine loads and 3 different ambient conditions. This study presents a power turbine generator using a six-cylinder low-speed marine diesel engine. Analyses are performed by considering three different ambient conditions and three different diesel engine loads, and the exergy destruction of each component, exergy efficiency, exergy destruction rate, efficiency increases, and power output of the system is calculated. Besides that, the payback period is calculated according to the installation cost of the power turbine generator and the cost of the fuel saved annually. Based on the analysis, the highest power output for the power turbine generator occurred under 100% engine operating load and winter ambient conditions, and the lowest power output occurred under 75% engine operating load and tropical ambient conditions. On the other hand, for the same ambient conditions, the highest efficiency increase occurred at 90% engine operating load, and the lowest efficiency increase occurred at 100% engine operating load. In the power turbine generator, it is observed that the shortest payback period is 100% engine operating load and winter ambient condition.
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"Выбор индекса производительности центробежного сепаратора для комбинированных маслоочистительных комплексов судовых тронковых дизелей." Вестник Инженерной школы ДВФУ 45, no. 4 (2020). http://dx.doi.org/10.24866/2227-6858/2020-4-5.
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Показана перспективность комбинированной очистки моторного масла в судовых тронковых дизелях с использованием саморегенерирующихся фильтров и сепараторов. Этот метод очистки особенно эффективен для форсированных высокоавтоматизированных двигателей с низким угаром масла, работающих на высоковязких остаточных топливах. Обосновывается важность надежной защиты подшипников двигателя от абразивного изнашивания полнопоточным фильтрованием масла. Центробежный сепаратор, работающий по байпасной схеме, эффективно удаляет из системы смазки мелкодисперсную фазу нерастворимых загрязнений, что обеспечивает функционирование и повышает автономность саморегенерирующегося фильтра, а также замедляет старение смазочного масла. Доказывается необходимость подбора сепаратора по удельному индексу производительности, обеспечивающему ресурсосберегающее маслоиспользование в системе «дизель–топливо–масло– очистка». Новизна экспериментального моделирования эффективности этой системы состоит в оценке с помощью лабораторной моторной установки трибологических показателей отработавшего в судовом дизеле смазочного масла, отражающих взаимодействие звеньев рассматриваемой системы, и установлении их связи с изнашиванием двигателя. Эффективность системы идентифицирована по критерию изнашивания дизеля, что позволяет использовать ее расчетно-экспериментальную модель для определения параметров центробежного сепаратора – с тем, чтобы он удовлетворял требованиям рассматриваемых взаимодействующих звеньев. Модель трансформирована в выражение для расчета удельного, приходящегося на единицу мощности двигателя индекса производительности сепаратора, обеспечивающего минимальное изнашивание двигателя, бессменную работу смазочного масла и автономный срок службы саморегенерирующегося фильтра не менее 3 тыс. ч. Полученные рекомендации по подбору сепаратора в системе смазки двигателя с полной реализацией достоинств автоматизированной тонкой очистки моторного масла комбинированием фильтрования и центрифугирования применимы для судовых дизелей средней и повышенной частоты вращения мощностью до 20 тыс. кВт. Ключевые слова: ресурсосберегающее маслоиспользование, саморегенерирующийся фильтр, центробежный сепаратор, изнашивание дизеля, комбинированная очистка масла, смазочная система, индекс производительности сепаратора, оптимизация сепарирования масла The prospects of combined cleaning of engine oil in ship trunk diesel engines using self-regenerating filters and separators are shown. This cleaning method is especially effective for high-powered, highly automated engines with low oil waste, operating on high-viscosity residual fuels. The importance of reliable protection of engine bearings from abrasive wear by full-flow oil filtration is substantiated. The centrifugal separator, operating according to the bypass scheme, effectively removes the finely dispersed phase of insoluble contaminants from the lubrication system, which ensures the functioning and increases the autonomy of the self-regenerating filter, and also slows down the aging of the lubricating oil. The necessity of selecting a separator according to the specific performance index, which ensures resource-saving oil use in the “dieselfuel-oil-cleaning” system, is proved. The novelty of the experimental modeling of the efficiency of this system consists in evaluating the tribological indicators of the lubricating oil used in a marine diesel engine, reflecting the interaction of the links under consideration, on a laboratory motor unit, and establishing their connection with engine wear. The efficiency of the presented system is identified by the criterion of diesel wear, which makes it possible to use its computational and experimental model to determine the parameters of a centrifugal separator so that it meets the requirements of the considered interacting links. The model has been transformed into an expression for calculating the specific index of the separator performance per unit of engine power, which ensures minimum engine wear, permanent operation of the lubricating oil and an autonomous service life of a self-regenerating filter of at least 3 thousand hours. Full realization of the advantages of automated fine cleaning of engine oil by combining filtration and centrifugation, are applicable for marine diesel engines of medium and high speed with a capacity of up to 20 thousand kW. Keywords: resource-saving oil use, self-regenerating filter, centrifugal separator, diesel wear, combined oil purification, lubrication system, separator performance index, optimization of oil separation
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Oladokun, Sulaiman Olanrewaju Oladokun. "Hydrodynamic Model Test and Simulation for the Design of Offshore Aquaculture System for Macro Algae Farming." Journal of Aquaculture & Livestock Production, June 30, 2023, 1–10. http://dx.doi.org/10.47363/jalp/2023(4)120.
Full textAbstract:
Marine algae biomass energy source is increasing getting approval from policy maker and community. Beside production of seaweed for biomass energy, seaweed plantation has benefit for food, cosmetic, gelatin and pharmaceutical products. Large production of biomass will require deployment of very large multibody floating structure offshore. To ensure that the system is reliable, design needs to be built, a mooring component for the mooring system, need to be properly sized to provide reliable strength for position keeping. This paper present, result of hydrodynamic test carried in UTM lab to determine coefficient required for the design and simulation of mooring system for very large floating structure for offshore aquaculture structure for ocean plantation, the paper also present safety and efficiency of the mooring system. Hydrodynamic test is traditionally used to secure coefficient require for design for environment for ship structure and offshore platform hydrodynamic interaction. The case of seaweed biomass is unique because the seaweed interacts directly and moves with the environment. The obtained the coefficient is used to model the static moorings system that assess the tension, tilt, safe mass and motion of the mooring components. Interpolated time dependent currents from the towing tank are used to estimate dynamic response of the mooring as well as the draft of the mooring components, the overall analysis is use to select required mooring components of the system. The outcome of the test presented in this paper will help for future development of offshore aquaculture system and multibody system deployment and analysis