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Статті в журналах з теми "Shipboard cables"

Автор: Grafiati

Опубліковано: 30 травня 2022

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Dolgolenko, V. T., Yu G. Ermolin, and S. M. Piskunov. "MODERN SHIPBOARD CABLES." Kabeli i provoda, no. 4 (2021): 25–31. http://dx.doi.org/10.52350/2072215x_2021_4_25.

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Choi, Jin-Kyu, Eiichiro Araki, and Katsuyoshi Kawaguchi. "Cable Laying Using an ROV." Marine Technology Society Journal 54, no. 5 (September 1, 2020): 84–90. http://dx.doi.org/10.4031/mtsj.54.5.12.

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AbstractA remotely operated vehicle (ROV) can install submarine cables along a planned route accurately, thereby deploying cabled seafloor observatories at the intended locations. In this study, we developed an ROV-based cable-laying system. Its manual and automated versions have been successfully used for the installation of the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET). The automated cable-laying system shows many advantages; for example, the cable-laying speed increased by approximately 0.1 knot from 0.5 knot, and the number of operators was reduced by half. Thus, the physical and mental burdens on the shipboard members including ROV operators were relieved. In this paper, we share our experiences when laying cables using an ROV during DONET installation. First, the issues that should be addressed to complete a successful cable-laying operation are discussed; subsequently, our manual and automated cable-laying systems are introduced. Then, the observations made during field operations for DONET installation are presented, which provide useful tips for developing an ROV-based cable-laying system.

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Griffiths, Richard W., and Herbert I. Chatterton. "Continuously Distributed Fiber Optic Monitoring System for Shipboard Applications." Marine Technology and SNAME News 25, no. 03 (July 1, 1988): 209–19. http://dx.doi.org/10.5957/mt1.1988.25.3.209.

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This paper suggests several areas of applicability wherein continuously monitored fiber optic cables of composite construction will improve the sensing ability of locating and reporting the conditions extant on ships of various types. By using continuous fiber cables strategically located throughout the ship that are compositely clad with different coatings to detect temperature, pressure and strain, an optically attenuated profile can be continuously monitored on a cyclical basis to report the specific conditions on a real-time basis. Preliminary bench test results of prototype jacketed fiber optic cable indicate that strains of 0.0004 to 0.003 in./in. can be detected as well as pressure changes of similar sensitivity. Currently, tests are being run to determine temperature sensitivity, and it is expected that comparable results will be achieved. With the development of the systems and improvement in jacketing materials, further refinements and expansion of capabilities are expected.

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Swartz, Marshall, Daniel J. Torres, Steve Liberatore, and Robert Millard. "WHOI SDSL Data-Link Project—Ethernet Telemetry through Sea Cables." Journal of Atmospheric and Oceanic Technology 34, no. 2 (February 2017): 269–75. http://dx.doi.org/10.1175/jtech-d-11-00196.1.

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AbstractA data telemetry technique for communicating over standard oceanographic sea cables that achieves a nearly 100-fold increase in bandwidth as compared to traditional systems has been recently developed and successfully used at sea on board two Research Vessel (R/V) Atlantis cruises with an 8.5-km, 0.322-in.-diameter three-conductor sea cable. The system uses commercially available modules to provide Ethernet connectivity through existing sea cables, linking serial and video underwater instrumentation to the shipboard user. The new method applies Synchronous Digital Subscriber Line (SDSL) communications technology to undersea applications, greatly increasing the opportunities to use scientific instrumentation from existing ships and sea cables at minimal cost and without modification.

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WARD, THOMAS A., and JOHN I. YKEMA. "Fire Protective Coating System for Shipboard Electrical Cables." Naval Engineers Journal 102, no. 3 (May 1990): 154–61. http://dx.doi.org/10.1111/j.1559-3584.1990.tb02641.x.

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WARD, THOMAS A., and JOHN I. YKEMA. "Fire Protective Coating System for Shipboard Electrical Cables." Naval Engineers Journal 102, no. 6 (December 1990): 63. http://dx.doi.org/10.1111/j.1559-3584.1990.tb01755.x.

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Budianto, Firman, Adi Kurniawan, Indra R. Kusuma, Akhmad R. Kurniawan, and Ahlur R. N. Gumilang. "Comparison of voltage harmonics in AC and DC shipboard electrical power distribution systems: A case study of 17,500 DWT tanker vessel." IOP Conference Series: Earth and Environmental Science 972, no. 1 (January 1, 2022): 012071. http://dx.doi.org/10.1088/1755-1315/972/1/012071.

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Abstract Recently, direct current (DC) shipboard electrical power distribution systems has begun to be looked at to replace conventional alternating current (AC) distribution systems. DC distribution systems has some technical advantages such as lower power losses and drop voltage across the distribution cables. However, there is a drawback in its high harmonics distortion due to the utilization of AC-DC rectifier in the generation side and DC-AC inverter in the load side. This study tries to investigate how much increase of voltage harmonics when a conventional AC shipboard electrical power distribution systems is replaced with equal DC systems. A 17,500 deadweight tonnage (DWT) shipboard systems is used as the case study. Both of AC and DC distribution systems are modelled with a same generation and load systems in a simulation software and the results are being compared. The comparison shows that DC distribution systems generate voltage harmonics are higher than AC distribution systems for the sample vessel.

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Boev, Mikhail A., Nikita E. Molchanov, and Artem A. Kosilov. "Studying the Longitudinal Sealing of Shipboard Cables by Means of Waterproofing Materials." Vestnik MEI 2, no. 2 (2018): 53–58. http://dx.doi.org/10.24160/1993-6982-2018-2-53-58.

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Tsitsikyan, G. N., M. Yu Antipov, and A. I. Senchenko. "Estimation of electrodynamic powers affecting shipboard power cables laid along lengthy metal structures." Shipbuilding, no. 3 (2021): 54–56. http://dx.doi.org/10.54068/00394580_2021_3_54.

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Akhrestin, Mikhail A., Alexander A. Vorshevsky, and Petr A. Vorshevsky. "DETERMINATION OF SHIPBOARD CABLES PARAMETERS FOR CALCULATING THE PULSE NOISE PROPAGATION AND CALCULATION ACCURACY ESTIMATION." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 11, no. 3 (June 28, 2019): 582–91. http://dx.doi.org/10.21821/2309-5180-2019-11-3-582-591.

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Yang, Daqing. "Crossing the Pacific." Pacific Historical Review 88, no. 4 (2019): 524–53. http://dx.doi.org/10.1525/phr.2019.88.4.524.

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In mediating the human experience of space, communications technologies played an important role along with means of transportation. When wireless telegraphy was introduced to Japan around the turn of the twentieth century, it was not just the military that made successful use of the incipient technology. The adoption of shipboard wireless telegraphy in trans-Pacific navigation helped reshape the Japanese spatial experience of the world’s largest ocean, thanks to extensive coverage by Japanese newspapers. However, technology never marches forward in a straight line as many published histories of wireless telegraphy suggest. The lack of inter-continental wireless telegraphy contributed to communication congestion across the Pacific during World War I, forcing the Japanese government to relax its monopoly while the Japanese business community abandoned its endeavor to build new trans-Pacific submarine cables in favor of wireless telegraphy. By the early 1930s, this public-private partnership enabled Japan to become a major player in international wireless telegraphy which dominated trans-Pacific communication. This article demonstrates that space and technology became mutually constitutive so that the Pacific Ocean could best be described as a single spatial-technological construct.

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Белей, В. Ф., Г. А. Решетников, and К. В. Коротких. "Research of higher harmonic components of voltage and current and their influence on the functioning of shipboard electrical equipment." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII)</msg>, no. 4(54) (December 2, 2021): 34–43. http://dx.doi.org/10.37220/mit.2021.54.4.004.

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Одним из направлений научно-технического прогресса на объектах морской индустрии является широкое использование технологий, основанных на нелинейных элементах, что позволяет значительно снизить их массогабаритные показатели и расшить их функциональные возможности. Однако применение таких технологий приводит к ухудшению качества электрической энергии, в первую очередь за счет высших гармонических составляющих напряжения и тока. В статье показана природа высших гармонических, выполнен анализ разделов «Правил классификации и постройки морских судов. 2021», российских и ряда зарубежных стандартов в области качества электроэнергии, регламентирующих уровень высших гармонических составляющих напряжения и тока в электрических сетях и системах. В работе приведены результаты теоретических и экспериментальных исследований влияния высших гармонических составляющих на функционирование судового электрооборудования: асинхронных электродвигателей, силовых кабелей, трансформаторов, конденсаторных батарей и систем освещения. Определены выражения, позволяющие оценить это влияние. Показано, что в основном это влияние проявляется: в дополнительном нагреве электрооборудования за счет поверхностного эффекта; вибрации асинхронных электродвигателей при высоких значениях 5 и 7 гармоник напряжения судовой электрической сети. One of the areas of scientific and technological progress at the facilities of the marine industry is the widespread use of technologies based on nonlinear elements, which can significantly reduce their weight-size parameters and dimensions and expand their functional capabilities. However, the use of such technologies leads to a deterioration in the quality of electrical energy, primarily due to higher harmonic components of voltage and current. The article shows the nature of higher harmonics, analyzes the sections of the «Rules for the Classification and Construction of Sea-Going Vessels. 2021», Russian and a number of foreign standards in the field of electric power quality, regulating the level of higher harmonic components of voltage and current in electrical networks and systems. The paper presents the results of theoretical and experimental studies of the influence of higher harmonic components on the functioning of shipboard electrical equipment: asynchronous electric motors, power cables, transformers, capacitor banks and lighting systems. Formulas have been determined to assess this effect. It is shown that the influence is mainly manifested: in additional heating of electrical equipment due to the skin effect; vibrations of asynchronous electric motors at high values of 5th and 7th voltage harmonics of the ship's electrical network.

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Li, Hong Jiang, and Hao Lan Zhang. "Power Line Carrier Communication Channel Model Applied to Shipboard Electric Network." Applied Mechanics and Materials 385-386 (August 2013): 1164–70. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1164.

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It is necessary to build a particular communication channel model to investigate shipboard electric network power line carrier technology. And this model must live up to characteristics of ordinary power line as well as shipboard electric network. This paper confirms the lighting network as the PLC application network in the first place, on the basis of lumped parameter transmission model, analyzes shipboard cable AC resistance, describes pulse noises of shipboard loads, and builds the shipboard PLC channel model. Comparing with the PLC multipath model of large land electric network, this channel model also reflects characteristics of high frequency time-varying selective fading and low frequency smooth fading, at the same time, lives up to shipboard electric network characteristics.

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Wei, Yi, Yan Cheng Liu, Yu Dong Liu, and Chuan Wang. "TTSP-Based Study on Residual Life Prediction of Shipboard Cable." Advanced Materials Research 516-517 (May 2012): 1843–47. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1843.

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In this paper, TTSP is used to demonstrate that the aging characteristic quantity at high temperature accords with that at low temperature, and to predict the residual life of shipboard cable. The aging process of cable is described based on second order dynamic model. The method is proved effective by the experimental data, and provides theoretical bases for residual life of cable and cable anti-aging study under the influence of multi-factors.

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Greenberg, B. F. "CABLE CALCULATIONS FOR SHIPBOARD POWER AND LIGHTING SYSTEMS." Journal of the American Society for Naval Engineers 56, no. 3 (March 18, 2009): 346–65. http://dx.doi.org/10.1111/j.1559-3584.1944.tb01636.x.

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Buev, S., and A. Vlasov. "Comparison of diagnostic methods for thermal aging of shipboard cable." IOP Conference Series: Earth and Environmental Science 539 (August 13, 2020): 012127. http://dx.doi.org/10.1088/1755-1315/539/1/012127.

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Wei, Yi, Yan Cheng Liu, Chuan Wang, and Gang Chen. "The Residual Life of Shipboard Cable Forecasting Based on PSO and GM(1, 1)." Advanced Materials Research 542-543 (June 2012): 578–83. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.578.

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In this paper, the Gray Theory is used to predict the residual life of shipboard cable. However, under the influence of multi-factors, the grayscale of the model will be enlarged, which will influence the accuracy of the prediction. Therefore, the optimized parameter of the GM (1, 1) model based on PSO, is introduced to improve the precision of the predication. The method is proved effectively by the experimental data and the Arrhenius Equation.

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Kimiaghalam, Bahram, Abdollah Homaifar, Marwan Bikdash, and Brian R. Hunt. "Feedforward Control Law For A Shipboard Crane With Maryland Rigging System." Journal of Vibration and Control 8, no. 2 (February 2002): 159–88. http://dx.doi.org/10.1177/107754602023816.

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A state-space model of the Maryland Rigging shipboard crane is derived from Newton's law under the assumptions of boom stiffness, fully controllable boom motion, no cable elasticity, no damping, and full control authority for changing the length of the rope. A chaotic rolling moment, with a dominant frequency of the same order as the resonance frequency of the shipboard crane, is applied to the ship as an external disturbance. The effect of this disturbance is studied. Since designing a controller by means of analytical methods for this system is too complex, we use a novel approach to this problem that focuses on the equilibrium point. By deriving the equations for calculating the position of the equilibrium point of the load in space, we change the problem to minimizing the change in the position of this point. A feedforward type controller is then designed as to keep the load closest to the “equilibrium point” for the actual roll angle. The controller seeks to suppress the load sway caused by the ship's rolling motion by changing the luffing angle while the friction in the pulley is assumed to be negligible. Changing the luffing angle seems to be the most effective control action in shipboard cranes. The feedforward gain is then optimized by numerical methods. The simulation results for this controller show a huge decrease in the sway magnitude as compared to the cases with no control. The roll angle, luffing angle of the boom, and the length of the rope are changed individually and then the related optimum feedforward gains are numerically obtained. Using these data, the mapping of the optimum gain based on these variables is derived. Scheduling the gain based on this mapping greatly improves the performance of the feedforward controller. This procedure can be repeated for similar applications.

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Fu, Li, Ying Wei, Yan-kai Zhou, and Tao Cheng. "Modeling and control of the pulley buffer system of arresting cable for shipboard aircraft based on magneto-rheological fluid." Journal of Shanghai Jiaotong University (Science) 17, no. 5 (October 2012): 573–78. http://dx.doi.org/10.1007/s12204-012-1327-4.

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Savenko, A. E., and P. S. Savenko. "Supporting the operation of the electrical power system of modern special purpose vessels with dynamic positioning." Power engineering: research, equipment, technology 23, no. 6 (March 30, 2022): 99–108. http://dx.doi.org/10.30724/1998-9903-2021-23-6-99-108.

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THE PURPOSE. Consider the use of special purpose vessels with a dynamic positioning system. To conduct observations and research of the operation of electrical power systems of such vessels for the existence of problems in them that affect the performance of technological operations. To propose methods and means aimed at eliminating situations and processes that adversely affect the operation of shipboard electrical power systems when laying pipelines.METHODS. For observation and research, the unified electrical power systems with electric rudder propellers and a system for laying an underwater pipeline of the "Seven Vega" cable layer was considered. Collected information on all the main electrical systems of the vessel "Seven Vega". Experimental studies were carried out aimed at studying the operating modes of the electrical power system during the laying of pipelines.RESULTS. Experimental oscillograms of currents of parallel operating diesel-generator sets in different modes have been obtained. The existence of power exchange oscillations during the operation of the unified electric power system of the cable-laying ship “Seven Vega” is noted. The data on the negative influence of power oscillations on the operation of tensioners during the laying of underwater pipelines were obtained.CONCLUSION. The use of sea-going vessels with dynamic positioning for laying pipelines and performing oil and gas production operations requires ensuring the operation of their electrical power systems. To ensure the high-quality operation of tensioners in pipeline laying systems, it is necessary to ensure the adjustment of their regulators and to exclude the occurrence of power exchange oscillations during parallel operation of generator sets.

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Agafonov, A. M., A. A. Worshevsky, P. A. Vorshevskii, E. S. Grishakov та A. S. Kornev. "Обеспечение электромагнитной совместимости систем интеллектуального управления при появлении помех в судовых кабельных трассах". MORSKIE INTELLEKTUAL`NYE TEHNOLOGII, № 1(47) part: 3 (15 лютого 2020). http://dx.doi.org/10.37220/mit.2020.47.1.072.

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Системы интеллектуального управления базируются на использовании цифровой техники и по своему принципу действия восприимчивы к внешним помехам. Изменения напряжения и тока в кабелях, электромагнитные поля могут привести к появлению в цепях передачи информации и питания систем напряжений, похожих на полезные сигналы, что приведет к сбоям в работе систем. Технология электромагнитной совместимости (ЭМС) призвана устранить взаимные влияния оборудования и обеспечить его нормальную работу в условиях действия помех. Кабельные трассы являются особенно значимым фактором для обеспечения ЭМС на судах. Помехи распространяются в кабелям от источников к чувствительному электронному оборудованию (ЭО). Метод распространяющихся волн дает возможность рассчитать изменения помех при распространении по кабелям. Силовые и информационные кабели могут прокладываться в одной трассе, что приводит к их электромагнитной связи. Рассмотренные модели оценивают наведенные напряжения в информационных кабелях при появлении помех в силовых кабелях. Параметры электромагнитной связи кабелей могут быть определены расчетным путем и экспериментально на основе предлагаемой методики. Приведенные рекомендации по снижение уровня излучаемых помех от кабельных трасс, снижению наведенных напряжений и выполнению экранирования призваны помочь разработчикам ЭО и систем в обеспечении ЭМС.Intellectual control systems are based on digital technique. Digital electronic equipment (EE) is the receptor of electromagnetic interference due to its function principle. EE malfunction can be caused by induced voltages in input/output and power supply circuits. Voltage and current changes in cables leads to electromagnetic noise and induced voltages. Protection technique for power, input/output, case and grounding ports can be used in equipment and ship systems design. Electromagnetic compatibility technique must eliminate mutual influence of EE and give normal function of EE in real electromagnetic environment. Cable run is important factor for EMC obtaining in ships. Noise voltage propagates in cable from noise source to sensitive EE. Voltage parameters can be calculated with travelling wave technique. There are power and information cables in shipboard cable run. Electromagnetic coupling of cables leads to voltages in one cable induced by voltages and current in other cable. Coupling models give possibility to calculate induced voltages. Parameters of coupling can be determined with calculation on the base of detailed information about cable run or with proposed experiment procedure. Proposed recommendations about cable emission decreasing, cables decoupling and shielding can be useful for EMC obtaining.

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Burakovskiy, Evgeny Petrovich, and Pavel Evgenievich Burakovskiy. "ALLOWANCE FOR THE SHEAR WHEN CALCULATING SHIPBOARD BEAMS BEARING INTENSIVE LOCALY DISTRIBUTED LOADS." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies, August 25, 2018, 7–16. http://dx.doi.org/10.24143/2073-1574-2018-3-7-16.

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In the process of operation, shipboard beams are subjected to the impact of various types of loads, the greatest danger being intense local distributed loads which are the main cause of damage to ship hulls. Therefore, designing ship hulls with minimum weight characteristics, as well as choosing the optimum sizes of connections when reinforcing the beams, require to use methods for calculating hull structures under the action of local loads beyond the elastic limit. The paper presents design models that allow taking into account shear effects in the beam walls, as well as the effect of the support forces on elastic-plastic base on their deformation. These problems can be avoided, if the sector of the frame on which shearing force has reached the limit value can be replaced by an ideal cable lying on the elastic-plastic base with variable stiffness characteristics. The results of the calculation of the shipboard beams have been compared using the described approach and the method of "instantaneous variation of bending parameters". It is shown that for large deflections the discrepancy is insignificant, which is explained by the dominant influence of the support forces on the side skin and longitudinal forces on the behavior of locally loaded frames. The proposed technique allows taking into account the impact of shear effects on deformation of locally loaded frames, which can be used in design and modernization of ship hulls to select the optimum sizes of connections.

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Tuan, Le Anh, Quang Ha, and Pham Van Trieu. "Observer-Based Nonlinear Robust Control of Floating Container Cranes Subject to Output Hysteresis." Journal of Dynamic Systems, Measurement, and Control 141, no. 11 (June 27, 2019). http://dx.doi.org/10.1115/1.4043984.

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A container crane mounted on a pontoon is utilized to transfer containers to smaller ships when a large container ship cannot reach the shallow water port. The shipboard container is considered as an underactuated system having complicated kinematic constraints and hysteretic nonlinearities, with only two actuators to conduct simultaneous tasks: tracking the trolley to destination, lifting the container to the desired cable length, and suppressing the axial container oscillations and container swing. Parameter variations, wave-induced motions of the ship, wind disturbance, and nonlinearities remain challenges for control of floating container cranes. To deal with these problems, this study presents the design of two nonlinear robust controllers, taking into account the influence of the output hysteresis, and using velocity feedback from a state observer. Control performance of the proposed controllers is verified in both simulation and experiments. Together with consistently stabilizing outputs, the proposed control approach well rejects hysteresis and disturbance.

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