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Journal articles on the topic 'Motor yacht'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 April 2022

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1

Gyurov, V., and G. Ivanova. "Study on technical solutions for shore power supply of motor yacht." IOP Conference Series: Materials Science and Engineering 1216, no. 1 (January 1, 2022): 012005. http://dx.doi.org/10.1088/1757-899x/1216/1/012005.

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Abstract The report presents an analysis of modern technical solutions for shore power supply of a specific class of passenger ships - luxury yachts for charter trips. The design data of a motor yacht in its different operating modes are considered, as well as the energy mix related to the fuel consumption at shore supply of the yacht during its stay at the port. The use of modern technical systems for shore supply includes the application of specific frequency converters, through which compatibility between the different voltage standards and the frequency for different shore power supply systems is realized. The costs of onshore power, compared to those of marine fuel, can be calculated from the current prices of onshore electricity and the energy produced from its own generators. The analysis of the basic design data of the motor yacht and the assessment of the energy costs on board, fuel economy and emission reductions will provide a clear answer to the advantages of the power supply from the shore of the vessel.

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2

Zhou, Mei Yu, Guang Liang Dai, Jian Xin Cheng, and Yun Hu. "Research of Small and Medium-Sized Motor Yacht Form Design Based on Imagines Acknowledge Theory." Advanced Materials Research 790 (September 2013): 643–50. http://dx.doi.org/10.4028/www.scientific.net/amr.790.643.

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The article starts from shipping aesthetics and combine the theory analysis of the imagines acknowledge and KE to analysis the relationship of the human visual acknowledge and yacht appearance, then it qualified the yacht imagines acknowledge with the mathematical statistics to build the mathematical statistics model of the relationship between the design elements of the yacht appearance and perceptive imagines. Establish the consumer expected yacht form and provide better experience in customer focus industrial design that the research does.

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3

Ivanova, G., and V. Gyurov. "Assessment of energy efficiency of a motor yacht depending on routes and sailing area." IOP Conference Series: Materials Science and Engineering 1216, no. 1 (January 1, 2022): 012004. http://dx.doi.org/10.1088/1757-899x/1216/1/012004.

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Abstract The report presents an analysis of luxury charter yachts which are a specific class of vessels that, in order to meet the schedules and increased requirements of the owners regarding the luxury of the services offered, have relatively high energy consumption for their gross tonnage, compared to other passenger ships. The study focuses on the analysis of energy efficiency of luxury yachts by calculating the energy efficiency index (EEDI). This involves comparing different parameters that affect the value of the EEDI and can lead to energy savings. The report presents theoretical and experimental studies of the energy costs of a 70-meter luxury yacht for charter trips. With the use of the design data of the ship’s electrical equipment at different operating modes, at different routes, under different conditions, dependences for analysis of the optimal modes of movement are obtained, which leads to the realization of maximum savings of electricity and primary energy.

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4

Shin, Sung-Chul, and Hwon-Mo Kim. "Hull Form Design of 46 Feet Motor Yacht." Journal of the Society of Naval Architects of Korea 45, no. 4 (August 31, 2008): 455–61. http://dx.doi.org/10.3744/snak.2008.45.4.455.

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5

KOPYLOV, SERGEY N. "CONFISCATION OF FOREIGN NATIONALS ' VESSELS FROM RUSSIAN YACHT CLUBS DURING THE FIRST WORLD WAR." CASPIAN REGION: Politics, Economics, Culture 66, no. 1 (2021): 60–69. http://dx.doi.org/10.21672/1818-510x-2021-66-1-060-069.

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The article is devoted to the confiscation of private vessels of foreign nationals during the First World War. Cases of confiscation of small vessels by the metropolitan river Police and the Baltic Fleet are considered. Special attention is paid to the distribution of confiscated vessels. Information is given that yachts and boats were sent to the Naval School and other naval units in need. Among the requests for the transfer of confiscated vessels, it is necessary to highlight the requests received from the Baltic fleet submarine connection, the naval artillery unit of the Kroonstad fortress, the commandant of the premise fortress and the transport flotilla of the black sea fleet. The article examines the prerequisites and reasons for the confiscation of small-sized floating vehicles and German and Austrian subjects. The article analyzes the cases of return of the vessel to a russian citizen of finnish origin after confiscation. The relationship between the events of the First World War and changes in the activities of Russian aristocratic yacht clubs is traced. The author studies the history of domestic sports organizations and Russian history in the early twentieth century. In addition, the organization of Russian sports organizations in the early twentieth century is considered. Russian imperial yacht clubs were rather reluctant to give small vessels belonging to foreign subjects to the official authorities. As a result, the Metropolitan River Police and the Baltic Fleet confiscated sailing and motor vessels owned by German and Austro-Hungarian citizens from aristocratic yacht clubs.

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6

Cakici, Ferdi, Hakan Yazici, and Ahmet Dursun Alkan. "Optimal control design for reducing vertical acceleration of a motor yacht form." Ocean Engineering 169 (December 2018): 636–50. http://dx.doi.org/10.1016/j.oceaneng.2018.10.006.

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7

Yücenur, Ganimet Nilay. "A Sequential Solution with MCDM Methods at the Motor-Yacht Construction Problem." Journal of ETA Maritime Science 9, no. 3 (September 30, 2021): 177–91. http://dx.doi.org/10.4274/jems.2021.88155.

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8

Ozturk, Deniz. "Performance of a Magnus effect-based cylindrical roll stabilizer on a full-scale Motor-yacht." Ocean Engineering 218 (December 2020): 108247. http://dx.doi.org/10.1016/j.oceaneng.2020.108247.

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9

Cepowski, Tomasz. "An estimation of motor yacht light displacement based on design parameters using computational intelligence techniques." Ocean Engineering 231 (July 2021): 109086. http://dx.doi.org/10.1016/j.oceaneng.2021.109086.

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10

Frech, Marie-Lena, David D. Loschelder, and Malte Friese. "How and Why Different Forms of Expertise Moderate Anchor Precision in Price Decisions." Experimental Psychology 66, no. 2 (March 2019): 165–75. http://dx.doi.org/10.1027/1618-3169/a000441.

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Abstract. Increasing price precision leads to linearly stronger anchoring effects for amateurs, but highly precise anchors can backfire for experts. Previous research focused on experts bargaining about an object within their expertise domain (e.g., real-estate agents negotiated about a house listed at €978,781.63). This leaves unknown whether too much precision backfires for experts because of their (a) general negotiation expertise, (b) domain-specific pricing knowledge, or (c) the combination of general expertise and price-knowledge. Our pre-registered report seeks to replicate the too-much-precision effect and to experimentally separate general negotiation expertise from domain-specific price-knowledge. Seasoned experts (real-estate agents) negotiate about an object either within (house) or outside (motor yacht) their domain of expertise. We measure experts’ willingness to pay (WTP), counteroffer, self-ascribed versus other-ascribed competence, and their self-ascribed versus other-ascribed price-knowledge. Based on responses of 400 professional real-estate agents, we replicate the advantageous anchor precision effect and illustrate that too much precision backfires regardless of whether agents negotiate within (house) or outside (yacht) their domain of expertise. Mediation analysis suggests that, consistent with previous research, the impact of precise anchors is due to the competence attributed to the negotiation opponent. Our results offer insights into the psychological mechanisms and theoretical understanding of anchor precision.

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11

Macbeth, Jim. "Ocean Cruising: A Sailing Subculture." Sociological Review 40, no. 2 (May 1992): 319–43. http://dx.doi.org/10.1111/j.1467-954x.1992.tb00891.x.

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Just after dawn, an English couple in their 30's haul up their anchor and motor across the stillness of Suva harbour. The hurricane season is approaching and they are embarking on the 2–3 week trip to Bay of Islands New Zealand for the southern summer. Three months earlier, as their yacht lay aground on the fringing reef of uninhabited Suvarov atoll, they wondered if they'd ever reach New Zealand. But, with the help of other cruisers and lucky tides their steel 36 footer was clear and safe in under 24 hours. What was to be a one year trip around the north Atlantic was now happily way off course in the South Pacific and likely to remain so for some time. That is just a glimpse of one small aspect of ocean cruising, the subculture of interest here. However, throughout the paper the ethnography of cruising is developed further. A model is proposed to show how individuals come to share the subculture ideology and then to participate in the lifestyle. Subsequently, 1 will place ocean cruising in the context of subculture theory by expanding the ethnography and relating cruising to other subcultures.

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12

Gohar, Amir. "Greening and opening the public space of the Nile banks. A demonstration case study in Maadi, Cairo." Journal of Public Space 3, no. 1 (April 30, 2018): 31–48. http://dx.doi.org/10.5204/jps.v3i1.317.

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The Nile, in general, and particularly in Cairo, is an ecological, cultural and social corridor that is not yet fully utilized. The 2011 Cairo workshop “Connecting Cairo to the Nile” identified the potential to increase accessibility to the river, suggested longitude trail system, proposed connecting the waterfront with adjacent neighborhoods and proposed expanding the ferry system. I studied a 2-km reach of the east bank in Maadi, a wealthy suburb about 10 km upstream of the city center, with relatively greener banks, availability of resources at the district level, higher awareness of local residents, physical setting allow for banks re-use, existence of community organizations (i.e. Tree Lovers and Midan). Findings of fieldwork and interviews show that: (i) species of native vegetation found are Phoenix Dactylifera, Jacaranda, Cortedarea and Papyrus alba; these are concentrated along 115 meter in southern part of the study area. (ii) Public access was categorized into: public space (accessible), private or semi-public space (accessible with conditions), and prohibited (inaccessible). Along this representative stretch of the Nile, the public access was limited to 16%, the private or semi-public makes 29% and the prohibited zones are 55%. (iii) Boating operations found to be in three categories, floating hotels (Nile cruises), motor boats (including ferries) and sailing boats, all are scattered along the banks without an overall plan or organization, which affects water flow and block public access to the banks. To better develop the banks, I recommend (i) maintaining existing riparian vegetation and expand it to other areas with healthy banks or planted nurseries, (ii) connecting open public spaces to create a pleasant walking trail along the banks in addition to improving public access by relocating government buildings (such as the police or military facilities) and facilitate access to the river for general public, (iii) reducing the anchoring points to two locations and redistribute boating operations to group all motor boats to use the ferry anchoring points and all the sailing boats to use Al-Yacht club marina.

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13

Grządziela, Andrzej. "Propulsion systems of motor-sail yachts — problems of diagnosing." Zeszyty Naukowe Akademii Marynarki Wojennej 207, no. 4 (June 30, 2016): 33–44. http://dx.doi.org/10.5604/0860889x.1229753.

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14

Summers, John. "Book Review: The Golden Century: Classic Motor Yachts 1830–1930." International Journal of Maritime History 14, no. 1 (June 2002): 382–83. http://dx.doi.org/10.1177/084387140201400153.

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15

Yamafuji, Kazuo. "Factory Tour to Yamaha Motor." International Journal of Automation Technology 2, no. 4 (July 5, 2008): 317–19. http://dx.doi.org/10.20965/ijat.2008.p0317.

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Yamaha Motor Co. Ltd., founded in 1955, is representative of global Japanese companies with factories worldwide that deliver a wide variety of products meeting customer needs. It employs 51,000 working on product lines including motorcycles, scooters, hybrid (power-assisted) bicycles, snowmobiles, boats, outboard motors, yachts, water vehicles, diesel engines, automobile engines, surface mounters for electronic parts, industrial robots, industrial unmanned helicopters, and electric wheelchairs. The December accounting term for fiscal 2007 showed unconsolidated sales of 799.2 billion yen and consolidated sales of 1,756.7 billion yen. The percentage of sales by product was 60.1% for motorcycles, 16.4% for marine use, 15.2% for special equipment, and 8.3% for others in the same fiscal year. The percentage of sales by region was 35.2% for the United States, 23.9% for Europe, 17.6% for Japan, 9.3% for Asia, and 14.0% for others. In the 21st century, Yamaha holds the basic philosophy of creating values and profits for sustainable growth and offering new excitement and a more fulfilling life for people worldwide.

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16

Summers, John. "Book Review: Millionaires, Mansions, and Motor Yachts; An Era of Opulence." International Journal of Maritime History 17, no. 1 (June 2005): 357–58. http://dx.doi.org/10.1177/084387140501700153.

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17

Ruggiero, Valerio. "New interactive method to determine parameters for large motor yachts stability." International Journal on Interactive Design and Manufacturing (IJIDeM) 13, no. 4 (June 14, 2019): 1557–64. http://dx.doi.org/10.1007/s12008-019-00605-3.

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18

Quintania, Melani, Danny Faturachman, T. Husain, Bayu Pasupati, and Ahmad Taufik. "Utilization of GPS Technology in The Maritime Sector on Motor Sailing Yachts." IOP Conference Series: Earth and Environmental Science 698, no. 1 (March 1, 2021): 012039. http://dx.doi.org/10.1088/1755-1315/698/1/012039.

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19

Daidola, John C., and Christopher J. Reyling. "Weight Definition and Control for Fast Craft." Marine Technology and SNAME News 28, no. 06 (November 1, 1991): 329–39. http://dx.doi.org/10.5957/mt1.1991.28.6.329.

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A standard for weight definition and an approach to weight control is presented for modern motor yachts and other craft. This includes a definition of weight and loading conditions for these vessels which can be related to attainable vessel speeds. The weight control plan addresses concept though detail design, construction, delivery and service life. The procedure is adaptable to all types of hull structural material. Weight curves developed from regression of previous vessel data are included and cover a variety of pleasure and commercial craft. Examples of the effect of weight control on speed are given. Recommendations for application of the procedures are offered.

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20

Sener, Bekir, Abit Balin, Burak Yildiz, and Hakan Demirel. "A New TOPSIS Methodology Based on Single-Valued Neutrosophic Numbers for Selection of Suitable Roll Stabilizer Type for Motor Yachts." Journal of Ship Production and Design 36, no. 04 (November 13, 2020): 250–58. http://dx.doi.org/10.5957/jspd.09190052.

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Selection of a suitable stabilization system for motor yachts is a challenging problem for both owners and designers. Also, this is a good sample of multicriteria decision-making problem that includes many criteria required to be assessed at the same time. The present work aims to propose an extended Technique for Order Preference by Similarity to Ideal Solution methodology based on single-valued neutrosophic numbers which represent the uncertainty of real-world applications. A questionnaire was applied to a group of experts who were asked to evaluate four different stabilizer alternatives according to the 15 criteria determined. Evaluations of the experts were analyzed through the proposed methodology, and results were presented and discussed.

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21

Wawrzyniak, Natalia, and Andrzej Stateczny. "Automatic Watercraft Recognition and Identification on Water Areas Covered by Video Monitoring as Extension for Sea and River Traffic Supervision Systems." Polish Maritime Research 25, s1 (May 1, 2018): 5–13. http://dx.doi.org/10.2478/pomr-2018-0016.

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Abstract The article presents the watercraft recognition and identification system as an extension for the presently used visual water area monitoring systems, such as VTS (Vessel Traffic Service) or RIS (River Information Service). The watercraft identification systems (AIS - Automatic Identification Systems) which are presently used in both sea and inland navigation require purchase and installation of relatively expensive transceivers on ships, the presence of which is not formally required as equipment of unconventional watercrafts, such as yachts, motor boats, and other pleasure crafts. These watercrafts may pose navigation or even terrorist threat, can be the object of interest of the customs, or simply cause traffic problems on restricted water areas. The article proposes extending the traffic supervision system by a module which will identify unconventional crafts based on video monitoring. Recognition and identification will be possible through the use of image identification and processing methods based on artificial intelligence algorithms, among other tools. The system will be implemented as independent service making use of the potential of SOA (Service Oriented Architecture) and XML/SOAP (Extensible Markup Language/Simple Object Access Protocol) technology.

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22

Demirel, Hakan, Bekir Şener, Burak Yildiz, and Abit Balin. "A real case study on the selection of suitable roll stabilizer type for motor yachts using hybrid fuzzy AHP and VIKOR methodology." Ocean Engineering 217 (December 2020): 108125. http://dx.doi.org/10.1016/j.oceaneng.2020.108125.

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23

T, Pais. "Vibration Analysis of Motor Yacht." International Journal of Oceanography & Aquaculture 1, no. 4 (2017). http://dx.doi.org/10.23880/ijoac-16000120.

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24

Nazarov, A., and J. Wijnants. "HOME CATAMARAN: COST EFFICIENT SUPERYACHT." Design & Construction of Super and Mega Yachts 2019, May 15, 2019. http://dx.doi.org/10.3940/rina.smy.2019.04.

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The paper presents case study of 23.9m catamaran motor yacht project developed for live on board and long-range ocean cruising. The yacht is designed on the limit of legal 'small craft' range though due to catamaran scheme providing accommodation spaces comparable with larger superyachts. Approaches to styling are presented, with connection to seagoing shape and other functional requirements. Layout planning and functional zones specific for catamaran yachts are discussed, with attractive features for long range cruising, weekend boating and parties on board. General dimensioning of catamarans at early design stages is based on parametric study. Recommendations on performance prediction and related hull shape design issues are given; application of CFD methods for hull refinement is presented. Approaches and problems with stability assessment of catamarans are touched upon. Comparison of catamaran yachts with monohulls is provided, with discussion of pros and cons of each platform.

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25

"Water pump specially designed for luxury motor yacht." World Pumps 2003, no. 447 (December 2003): 16. http://dx.doi.org/10.1016/s0262-1762(03)00026-9.

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26

"Colvic wins mould tool contract for motor yacht." Reinforced Plastics 43, no. 5 (May 1999): 19. http://dx.doi.org/10.1016/s0034-3617(99)90742-7.

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27

"ALL-WELDED 96-FT AMERICAN-BUILT MOTOR YACHT." Journal of the American Society for Naval Engineers 68, no. 2 (March 18, 2009): 375–82. http://dx.doi.org/10.1111/j.1559-3584.1956.tb04035.x.

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28

Liang, M., and R. Birmingham. "IDENTIFICATION OF TECHNOLOGIES AND PROCESSES TO ENHANCE THE SUSTAINABLE DESIGN, MANUFACTURE, OPERATION, AND END-OF-LIFE OF THE MOTOR YACHT ABOVE 24 METERS." Design & Construction of Super and Mega Yachts 2019, May 15, 2019. http://dx.doi.org/10.3940/rina.smy.2019.18.

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Sustainable development is a continuing concern in the Superyacht Industry due to the pressure on not only minimizing environmental impact but also considering economic viability and social acceptability. It is possible to enhance efficiency and effectiveness of resource use in manufacture, operation and recycle by identifying the sustainable technologies at the design stage. However, there is a lack of a holistic method to measure sustainable performance over the life cycle of the motor yacht during the technologies selection. A Life Cycle Sustainability Assessment (LCSA)based Sustainable Value Added (SVA) method has been developed to measure the sustainable performance for each technology using on the motor yacht over 24 meters. It is a new approach using the financial measure to aggregate data with existing economic terms to communicate with the investor with one language. This paper presents a systematic method and process to guide designer and owners to select and invest relatively sustainable solutions for the motor Superyacht.

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29

Boote, D., T. Pais, G. M. Vergassola, and D. Giannarelli. "THERMAL LOAD EFFECTS ON ALUMINUM LIGHT ALLOY PLATES WITH EPOXY COATINGS." International Journal of Small Craft Technology Vol 159 Part B2 2017 159, B2 (December 1, 2017). http://dx.doi.org/10.3940/rina.ijsct.2017.b2.206.

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When the assembling of hull structure is completed, the sides of metal motor yachts are usually affected by bumps and hollows coming from welding plates to each other and plates to frames. These defects, normally tolerated on merchant ships, cannot be accepted on superyachts for which the external surface must be smooth and glossy. For this reason the surface finishing is achieved by a long and delicate process of filling, fairing and painting. The final result of this process is very important for the yacht aesthetics as the general appearance of the vessel depends on the external painting. As a matter of fact the quality of painting depends mainly on the undercoat preparation to assure an adequate grip and, most of all, a perfect smooth and faired surface. Despite accurate preparation and painting, surface conditions can undergo undesired alteration because of excessive heating due, as an example, to a long exposure to solar radiation. While stresses do not reach significant values because of the relatively low intensity of thermal loads, strains could still cause very slight surface distortions and undulations which are perceived by human eye as a surface defect. The phenomenon becomes particularly evident if the surface is painted with a dark colour. In this paper an investigation on the influence of temperature on the stress and strain distribution of aluminium light alloy plates coated by filler layers of different kind and thickness is reported. The study has been performed by FEM structural analyses calibrated by experimental measurements performed on laboratory specimens. This work represents the continuation of a research begun some time ago with the measurement of temperatures on yacht hulls exposed to solar radiation in different conditions.

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30

Magherini, M., A. Meredith Hardy, and A. Thoumazeau. "THE LIFE PLATFORM: LEVERAGING A VIRTUOUS CIRCLE DESIGN." Design & Construction of Super and Mega Yachts 2019, May 15, 2019. http://dx.doi.org/10.3940/rina.smy.2019.11.

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The end of 2018 saw the delivery of the motor yacht Bravo Eugenia. She is built by Oceanco based on the LIFE platform developed in collaboration with Lateral Naval Architects. This study defines the LIFE platform (i.e. Long, Innovative, Fuel efficient, Eco conscious) its key features and outlines its fundamental design pillars. The relative merits of main parameters are assessed against a typical similar sized yacht by use of baseline fleet data. LIFE’s low weight in relation to length and reduced powering requirements combined with a hybrid propulsion system result in a virtuous circle at which the centre is the single tier engine room. The benefits of the single tier layout such as the higher flexibility in designing the accommodation spaces and the improved balance between technical and luxury areas are outlined. In this context, various designers’ LIFE platform interpretations are provided as examples for discussion. The LIFE hybrid propulsion system is presented and the various modes of operations for which the hybrid system is conceived are discussed.

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31

CAMBAZ, Alihan, Yasin Furkan GÖRGÜLÜ, and Halit ARAT. "Two-Phase Numerical Modelling of a Wet Exhaust System in a Catamaran Motor Yacht Diesel Engine." European Journal of Science and Technology, December 10, 2021. http://dx.doi.org/10.31590/ejosat.1007351.

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32

"Motor yachts relaunched." Reinforced Plastics 47, no. 8 (September 2003): 10. http://dx.doi.org/10.1016/s0034-3617(03)00811-7.

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33

"Full steam ahead for motor yachts." World Pumps 2000, no. 400 (January 2000): 17. http://dx.doi.org/10.1016/s0262-1762(00)90398-5.

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34

Distad, Merrill. "Ten Ships that Rocked the World by G. Richardson." Deakin Review of Children's Literature 7, no. 3 (February 5, 2018). http://dx.doi.org/10.20361/g2xt3f.

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Richardson, Gillian. Ten Ships that Rocked the World. The World of Tens Series. Illus. Kim Rosen. Annick Press, 2015.Although nominally aimed at an audience of 9- to 12-year-olds, this children’s book unconventionally features a formal introduction, concluding epilogue, selected bibliography, further readings list, and a comprehensive index! Author Richardson follows her award-winning first contribution to the World of Tens series, Ten Plants that Shook the World, with this entry recounting the stories of ships significant in world history. The ships range from those of 15th-century, Ming-Chinese Admiral Zheng He’s treasure fleet to the Greenpeace Rainbow Warrior and the super-tanker Sirius Star that was hijacked by Somali pirates and held for ransom in 2008. Along the way, she chronicles Vasco da Gama’s flagship São Gabriel; the Lady Penrhyn which carried 104 women to Australia in 1787 as part of the “First Fleet” of transported convicts; the U.S.S. Susquehanna, that served as Commodore Perry’s flagship on his epic, diplomatic voyage to Japan; the Confederate Navy’s C.S.S. Hunley, the first submarine to sink a warship; the Komagata Maru and its cargo of would-be immigrants from India, turned away from Canada’s shores in 1914; the rechristened steamer Exodus (ex President Warfield), that brought Jewish refugees to the shores of Palestine in 1947; and the motor yacht Granma on which Fidel Castro secretly travelled from Mexico to Cuba in 1956 to incite and lead a revolution.Each vessel is provided with a history, physical description, account of its historical context and significant voyages, and its impact on subsequent world history. Imagined sketches of the experience of some passengers illuminate several of these accounts. All of this provides illustrator Kim Rosen with ample scope to employ photographs to augment her colourful designs and page layouts. The author acknowledges the assistance Capt A.C. Brooking, master mariner, who helped her ensure the accuracy of all things nautical. A book that can amuse, instruct, and be enjoyed by both children, and adults, it is recommended for all school and public libraries. Highly recommended: 4 out of 4 starsReviewer: Merrill DistadHistorian and author Merrill Distad enjoyed a four-decade career building libraries and library collections.

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35

Dogan, Timur, Hamid Sadat-Hosseini, and Frederick Stern. "Effects of Hook, Interceptor, and Water Jets on LCS Resistance/ Power, Sinkage, and Trim." Journal of Ship Research, March 1, 2021, 1–24. http://dx.doi.org/10.5957/josr.04200027.

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Verification and validation of computational fluid dynamic simulations are performed at model and full scales for the high-speed littoral combat ship (LCS) surface combatant, including the effects of hook, interceptors, and water-jet propulsion. Predictions of the body force thrust, sinkage, and trim use a speed controller for attaining self-propulsion. Two methods for water-jet performance are used: 1) evaluation of forces based on integration of the stress over the wetted area of the hull and water-jet duct, pump casing, and nozzle (integral method) and 2) ITTC (2005) water-jet test procedure (control volume method). The comparison errors at model (resistance, sinkage, and trim) and full (power and trim) scales are satisfactory using both Froude (Fr) scaled model- and full-scale trial data, including the effects of the interceptors and water jets (WJ) on resistance/power, sinkage, and trim. For the model-scale model without WJs, the negative bottom hydrodynamic pressure near the water-jet inlets are observed without and with the hook simulations, and experiments with the hook. The negative bottom vertical force near the water-jet inlets for the simulations without the hook supports Savitsky’s (2014) assertion that semi-displacement monohulls do not exhibit hydrodynamic lift and disproves Giles’ (1992) assertion to the contrary. The hook and interceptors do not affect the pressure distribution significantly near the water-jet inlets. For the full scale model, the WJs induce bow up trim for the simulations and interpolated (between conditions)- and Fr scaled model-scale experiments. The negative bottom pressure and vertical force near the water-jet inlet for the simulations disprove Giles’ (1992) assertion that the WJs provide additional hydrodynamic lift. This is further supported by the comparisons of the vertical force % thrust vs. inlet velocity ratio for the LCS, with results shown in Bulten (2005) for a high-speed motor yacht. Bulten (2005) shows positive vertical force for inlet velocity ratios ≥ 1.25. However, LCS operates in the regime of an inlet velocity ≤ 1.2; thus, consistent with Bulten (2005), the vertical force is negative. The nonlinear effects between the interceptors and WJs are small such that a linear combination can provide a reasonable approximation.

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36

Boote, D., G. Vergassola, and L. Strano. "A NUMERICAL DETERMINATION OF EFFECTIVE BREADTH OF GRP STIFFENED PLATES." International Journal of Maritime Engineering Vol 158 Part B1 2016 158, B1 (June 1, 2016). http://dx.doi.org/10.3940/rina.ijsct.2016.b1.187.

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Abstract:

Stiffened plates are the most common structural components used in many engineering branches such as aircraft, trains, ships, offshore structures, and buildings of every kind and dimension. In the marine field, in particular, merchant and naval ship hulls can be considered to be an assembling of simple modules such as bottoms, sides, decks and bulkheads, all formed by stiffened plates. This very simple structural model has the advantage of offering a good compromise between strength, construction cost and weight. At the same time, the scantling of a stiffened plate can easily be obtained by hand calculations or by more refined tools, such as FEM codes, if a more reliable optimization is required. If the first approach is used, the first action to be performed is the calculation of the plate width acting with the stiffeners, usually referred to as “effective breadth”. This aspect, widely assessed in the steel structural field since the 50s, still needs further investigations in the field of composite materials, commonly used for building motor and sailing yachts. Given the present financially critical situation affecting yachts, especially in the range of small and medium size vessels, many shipyards, with a long experience in the GRP construction, devote more attention, on one hand, to significantly reduce the weight and cost of the hull structure and, on the other hand, to increase the vessel dimensions to improve their market potential. In both cases, a more detailed structure scantling is required and, in the case of a “by hand” calculation, this mainly implies a deeper knowledge of the “effective breadth” concept for composites. In this paper, a numerical procedure for the calculation of the effective breadth of GRP, single skin and sandwich stiffened plates is presented, using a numerical approach based on the finite element method. This study is focused on plates stiffened by GRP box beams for single skin panels and by GRP girder beams for sandwich ones. All the geometric characteristics of the model have been varied parametrically, in order to obtain a very wide data series that has been statistically processed.

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