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Journal articles on the topic 'Floating structures'

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Published: 4 June 2021

Last updated: 6 February 2022

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1

Freeman, Elizabeth, Kristen Splinter, and Ron Cox. "FLOATING BREAKWATERS AS PUBLIC PLATFORMS â€“ IMPACT ON POSTURAL STABILITY." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 63. http://dx.doi.org/10.9753/icce.v36.structures.63.

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Floating Breakwaters are used extensively to provide cost effective protection from wind and vessel waves. Floating breakwaters are commonly multitasked, being used as a point of mooring for vessels or simply an access way to other pontoons in a small boat harbour, as well as their main function as wave dissipators. A floating breakwater does not completely stop the incident wave; rather it partially transmits, partially reflects and partially dissipates the wave energy. Cox et al (2007) completed wave flume testing of a number of floating breakwaters and reported on performance in irregular waves with particular emphasis on wave transmission and reflection, energy dissipation and restraining forces. Motion measurements were limited by the instrumentation. This paper discusses the results from a further series of laboratory experiments on the dynamic motions of an active floating breakwater system. The performance is related to wave attenuation, wave reflection and energy dissipation as well as safety considerations for standing persons based on high resolution measurements of accelerations in all six degrees of freedom.

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2

Kawasaki, Koji, Han Ut Dinh, Tetsuya Matsuno, and Tadashi Fukumoto. "NUMERICAL INVESTIGATION OF PRESSURE ACTING ON FLOATING PANEL FOR WAVE OVERTOPPING REDUCTION UNDER REGULAR WAVE ACTION." Coastal Engineering Proceedings 1, no. 33 (December 15, 2012): 82. http://dx.doi.org/10.9753/icce.v33.structures.82.

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In this paper, a 3-D multiphase flow model with solid-gas-liquid interaction, named ‘DOLPHIN-3D’, is utilized to numerically investigate the characteristics of pressure acting on a floating panel, which is installed in front of an upright seawall for wave overtopping reduction. The validity and utility of the model were confirmed through good agreements between the numerical results and experimental ones in terms of the dynamic response of the floating panel and the pressure at the bottom of the panel. The numerical results revealed that the model can appropriately simulate the pressure acting on the floating panel as well as the dynamic behavior of the panel under wave action.

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3

Cabrerizo-Morales, Miguel, RAFAEL Molina, Francisco De los Santos, and Alberto Camarero. "OPTIMIZATION OF OPERATIONALITY THRESHOLDS USING A MANEUVER SIMULATOR. CASE STUDY: FLOATING GATE AT CAMPAMENTO SHIPYARD." Coastal Engineering Proceedings 1, no. 33 (December 14, 2012): 53. http://dx.doi.org/10.9753/icce.v33.structures.53.

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Floating structures elements are part of complex systems in which climatic agents, those derived from human interaction during use and exploitation and freedom constraints are applied. Such complexity requires different analysis techniques for its comprehension This paper presents a methodology to define and optimize operationality thresholds of floating structures using a global scaled simulator in which all agents and system’s responses are modeled during a complete operational process.

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4

Konovessis, Dimitris, Kie Hian Chua, and Dracos Vassalos. "Stability of floating offshore structures." Ships and Offshore Structures 9, no. 2 (January 17, 2013): 125–33. http://dx.doi.org/10.1080/17445302.2012.747270.

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5

Sirlin, S., C. Paliou, R. W. Longman, M. Shinozuka, and E. Samaras. "Active Control of Floating Structures." Journal of Engineering Mechanics 112, no. 9 (September 1986): 947–65. http://dx.doi.org/10.1061/(asce)0733-9399(1986)112:9(947).

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6

Chow, Philip Y. "Two Futuristic Concrete Floating Structures." Structural Engineering International 3, no. 3 (August 1993): 161–64. http://dx.doi.org/10.2749/101686693780607831.

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7

McDougal, William G., and Wojciech Sulisz. "Seabed Stability Near Floating Structures." Journal of Waterway, Port, Coastal, and Ocean Engineering 115, no. 6 (November 1989): 727–39. http://dx.doi.org/10.1061/(asce)0733-950x(1989)115:6(727).

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8

Paulling, J. R., and Sushil Tyagi. "Multi-module floating ocean structures." Marine Structures 6, no. 2-3 (January 1993): 187–205. http://dx.doi.org/10.1016/0951-8339(93)90019-y.

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9

Ellinas, Charles P. "Floating Structures and Offshore Operations." Applied Ocean Research 11, no. 2 (April 1989): 112. http://dx.doi.org/10.1016/0141-1187(89)90014-x.

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10

Eatock Taylor, R. "Floating structures and offshore operations." Engineering Structures 11, no. 4 (October 1989): 290. http://dx.doi.org/10.1016/0141-0296(89)90048-5.

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11

Palmieri, Micol, Ilaria Giannetti, and Andrea Micheletti. "Floating-bending tensile-integrity structures." Curved and Layered Structures 8, no. 1 (January 1, 2021): 89–95. http://dx.doi.org/10.1515/cls-2021-0008.

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Abstract This is a conceptual work about the form-finding of a hybrid tensegrity structure. The structure was obtained from the combination of arch-supported membrane systems and diamond-type tensegrity systems. By combining these two types of structures, the resulting system features the “tensile-integrity” property of cables and membrane together with what we call “floating-bending” of the arches, a term which is intended to recall the words “floating-compression” introduced by Kenneth Snelson, the father of tensegrities. Two approaches in the form-finding calculations were followed, the Matlab implementation of a simple model comprising standard constant-stress membrane/cable elements together with the so-called stick-and-spring elements for the arches, and the analysis with the commercial software WinTess, used in conjunction with Rhino and Grasshopper. The case study of a T3 floating-bending tensile-integrity structure was explored, a structure that features a much larger enclosed volume in comparison to conventional tensegrity prisms. The structural design of an outdoor pavilion of 6 m in height was carried out considering ultimate and service limit states. This study shows that floating-bending structures are feasible, opening the way to the introduction of suitable analysis and optimization procedures for this type of structures.

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12

Tomasicchio, Giuseppe Roberto, Elvira Armenio, Felice D'Alessandro, Nuno Fonseca, Spyros A. Mavrakos, Valery Penchev, Holger Schuttrumpf, Spyridon Voutsinas, Jens Kirkegaard, and Palle M. Jensen. "DESIGN OF A 3D PHYSICAL AND NUMERICAL EXPERIMENT ON FLOATING OFF-SHORE WIND TURBINES." Coastal Engineering Proceedings 1, no. 33 (December 14, 2012): 67. http://dx.doi.org/10.9753/icce.v33.structures.67.

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The knowledge of the behavior of floating offshore wind turbines (W/T) under wave and/or wind action remains one of the most difficult challenges in offshore engineering which is mostly due to the highly non-linear response of the structure. The present study describes the design process of a 3D physical experiment to investigate the behavior of the most promising structure technology of floating W/T: spar buoy (SB) and tension leg platform (TLP) under different meteo conditions. In order to properly design the two W/T models, the following topics have been analyzed: mooring lines, mass distribution, appropriate scaling factor and data relative to the geometrical characteristics, wave basin dimensions and wind and waves conditions. In addition, the Smoothed Particle Hydrodynamics method (SPH) (Monaghan 1994) has been considered to simulate the 3D behavior of a floating offshore W/T. In particular, the SPH, calibrated and verified on the basis of the experimental observations, may represent a reliable tool for preliminary test of changes in the floater geometry.

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13

Wang, Kun, Guo-Kang Er, and Vai Pan Iu. "Seismic analysis of nonlinear offshore moored floating structures." Advances in Structural Engineering 21, no. 9 (December 7, 2017): 1361–75. http://dx.doi.org/10.1177/1369433217744356.

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This article presents a numerical model for solving the nonlinear random vibrations of offshore moored floating structures under seismic excitation. The offshore moored floating structure consists of the floating platform and mooring cables. The floating platform is considered as a rigid body with 3 degrees of freedom. The nonlinear equations of motions of the mooring cables are established using the nonlinear cable elements that are formulated based on the extended Hamilton principle. The nonlinear hydrodynamic drag forces that act on both the floating platform and cables are considered. In order to carry out the random vibrational analysis, the connection conditions between the floating structure and mooring cables are given to formulate the equations of motions of the whole system. Finally, the moored floating structure under horizontal seismic ground accelerations with Kanai–Tajimi model are analyzed using Monte Carlo simulation method. The probability density functions of the displacements of the moored floating structure and the maximum tensile force in cables are presented. The influences of different sag-to-span ratios or inclined angles of the mooring cables on the mean value and standard deviation of the displacements of the floating structure and the maximum tensile force in cables are analyzed.

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14

Ueda, Shigeru. "Present State of Concrete Floating Structures." Concrete Journal 33, no. 6 (1995): 5–13. http://dx.doi.org/10.3151/coj1975.33.6_5.

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15

East, Matthew. "Design for accessibility for floating structures." Proceedings of the Institution of Civil Engineers - Maritime Engineering 171, no. 3 (September 2018): 98–108. http://dx.doi.org/10.1680/jmaen.2018.12.

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16

WADA, Kouzou, Toshiyuki KANOU, Tomoo MAKABE, Kazuyoshi KIHARA, Masami MATSUURA, and Keisuke SASAJIMA. "RESEARCH ON ANTI-ROLLING FLOATING STRUCTURES." PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN 17 (2001): 199–204. http://dx.doi.org/10.2208/prooe.17.199.

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17

Stockstill, Richard L., Steven F. Daly, and Mark A. Hopkins. "Modeling Floating Objects at River Structures." Journal of Hydraulic Engineering 135, no. 5 (May 2009): 403–14. http://dx.doi.org/10.1061/(asce)0733-9429(2009)135:5(403).

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18

Azalinov, Dmitri. "Localized modes of long floating structures." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 1349. http://dx.doi.org/10.1121/1.426397.

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19

NAGAI, Minoru, Kazumasa AMEKU, Koutarou MATSUDA, Yoshioki NAGAI, and Tatsuya IZUMIKAWA. "1008 Mooring Method of Floating Structures." Proceedings of Conference of Kyushu Branch 2005.58 (2005): 373–74. http://dx.doi.org/10.1299/jsmekyushu.2005.58.373.

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20

Sharma, Susheel, SS Rajput, and SS Jamuar. "Floating-gate MOS Structures and Applications." IETE Technical Review 25, no. 6 (2008): 338. http://dx.doi.org/10.4103/0256-4602.45426.

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21

Ruol, Piero, Barbara Zanuttigh, Luca Martinelli, Peter Kofoed, and Peter Frigaard. "NEAR-SHORE FLOATING WAVE ENERGY CONVERTERS: APPLICATIONS FOR COASTAL PROTECTION." Coastal Engineering Proceedings 1, no. 32 (January 27, 2011): 61. http://dx.doi.org/10.9753/icce.v32.structures.61.

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Aim of this note is to analyse the possible application of a Wave Energy Converter (WEC) as a combined tool to protect the coast and harvest energy. Physical model tests are used to evaluate wave transmission past a near-shore floating WEC of the wave activated body type, named DEXA. Efficiency and transmission characteristics are approximated to functions of wave height, period and obliquity. Their order of magnitude are 20% and 80%, respectively. It is imagined that an array of DEXA is deployed in front of Marina di Ravenna beach (IT), a highly touristic site of the Adriatic Coast. Based on the CERC formula, long-shore sediment transport is evaluated in presence and in absence of this array of DEXAs. The sediment transport in this site is quite large and frequently changes directions during the year. The larger North directed contribution and the more persistent South directed one are similar in magnitude and almost compensate each other, with the latter only slightly prevailing. It is shown that the DEXA could be designed so that the effect on sediment transport becomes quite significant and the direction of the net transport can be reversed.

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22

Ruol, Piero, Luca Martinelli, and Paolo Pezzutto. "LIMITS OF THE NEW TRANSMISSION FORMULA FOR PI-TYPE FLOATING BREAKWATERS." Coastal Engineering Proceedings 1, no. 33 (October 25, 2012): 47. http://dx.doi.org/10.9753/icce.v33.structures.47.

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The aim of this work is to assess, by means of available experimental results and numerical simulations, the possible extension of the range of application of the formula proposed by Ruol et al. (J. Wat. Port, Coast. Ocean Eng., 1, 2013), giving wave transmission for chain-moored -type floating breakwaters. The formula is here applied out of the range used for its calibration and even to other types of FBs. The error between predicted and measured values is described and discussed with reference to the main geometrical variables. It appears that the formula performs fairly well for the box-type FB, but not in cases characterized by very different mooring stiffness compared to the one used for calibration. For instance in case of fixed or tethered FBs, the formula significantly overestimates the wave transmission.

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23

Lopez, Mario, Francisco Taveira-Pinto, and Paulo Rosa-Santos. "NUMERICAL MODELLING AND POWER TAKE OFF CHARACTERIZATION OF A WAVE ENERGY CONVERTER WITH BOUNDARY ELEMENT METHOD." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 27. http://dx.doi.org/10.9753/icce.v35.structures.27.

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This paper deals with the numerical modelling of an innovative technology for harnessing wave energy and its power take-off system. The investigated wave energy converter is CECO, a device based on the principles of oscillating bodies that is being developed at the Faculty of Engineering of the University of Porto, Portugal. The particularity of this concept lies on the relative motion between a floating part and a supporting one, which is restricted to translations along an inclined direction. First, the wave energy converter is modelled in the frequency domain by means of a panel model that is based on the boundary element method. Once obtained the frequency-dependent hydrodynamic coefficients of the floating part, the dynamic equation of motion is solved in the time domain by including, not only the hydrodynamic forces, but also the force of the power take-off system. The results prove the ability of the numerical modelling approach to simulate the behavior of the device and provide insight into its performance.

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24

Isaacson, Michael, and John Baldwin. "Moored structures in waves and currents." Canadian Journal of Civil Engineering 23, no. 2 (April 1, 1996): 418–30. http://dx.doi.org/10.1139/l96-046.

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The present paper provides a brief review of the analysis of moored floating structures in waves and currents. A hydrodynamic analysis is required in order to predict wave and current effects on floating structures, and corresponding numerical models for determining transmitted and reflected wave heights, added masses, damping coefficients, and wave exciting forces are summarized. A mooring analysis is required in conjunction with the hydrodynamic analysis in order to calculate the restraint provided by the mooring system, as well as the structure motions, mooring line and anchor loads, and mooring line configurations. Various aspects of static, dynamic, and nonlinear responses are discussed and illustrated with example applications. Key words: coastal engineering, currents, floating structures, hydrodynamics, mooring forces, ocean engineering, wave forces, waves.

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25

Liang, Bing Nan, Hong Liang Yu, and Yu Chao Song. "Analysis of Damping Performance for Cabin Deck Covered with Floating Floor Coverings." Advanced Materials Research 610-613 (December 2012): 2566–70. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2566.

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Floating floor coverings are widely applied in ship structures. With regard to the laminated composite shells made up of floating floor coverings and cabin deck and based on ANSYS system, a dynamics analysis on structures of three different kinds of floating floors is performed using FEM built upon laminated shell elements. The influence of rockwool board in terms of thickness, density and elastic modulus on structure dynamic characteristics is discussed. The performances of vibration control of three different floating floor structures are compared. The FEM performs well in analyzing and calculating the vibration control characteristics of structures, the results of which offer certain reference to the design and research on cabin deck covered with floating floor coverings.

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26

Fernandez, Hernan, Gregorio Iglesias, Rodrigo Carballo, Alberte Castro, and Pedro Bartolomé. "PHYSICAL AND NUMERICAL MODELING OF THE WAVECAT© WAVE ENERGY CONVERTER." Coastal Engineering Proceedings 1, no. 32 (February 1, 2011): 64. http://dx.doi.org/10.9753/icce.v32.structures.64.

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Wave energy presents a great potential in many coastal regions. This paper deals with WaveCat©, a new Wave Energy Converter (WEC) recently patented by the University of Santiago de Compostela. First, the WaveCat© concept and its main design elements. It is a floating WEC intended for intermediate water depths (50–75 m), whose principle of energy capture is wave overtopping. WaveCat© consists of two hulls, like a catamaran (hence its name); however, unlike a catamaran, the hulls are convergent so as to leave a wedge between them. Waves propagate into this wedge and, eventually, overtop the inner hull sides. Overtopping water is collected in onboard tanks and, subsequently, drained back to sea, propelling ultra-low head turbines in the process. The wave flume tests carried out on a 3D, fixed model at a 1:67 scale are presented. Development work is ongoing, including a numerical model—which is currently being validated based on the results from the physical model—and a 3D, floating physical model at a larger scale (1:30).

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27

Cengiz Ertekin, R., Jang Whan Kim, Koichiro Yoshida, and Alaa E. Mansour. "Very large floating structures (VLFS) Part I." Marine Structures 13, no. 4-5 (July 2000): 215–16. http://dx.doi.org/10.1016/s0951-8339(00)00037-x.

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28

Cengiz Ertekin, R., Jang Whan Kim, Koichiro Yoshida, and Alaa E. Mansour. "Very large floating structures (VLFS) Part II." Marine Structures 14, no. 1-2 (January 2001): 3–4. http://dx.doi.org/10.1016/s0951-8339(01)00004-1.

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29

Fu, Shixiao, Torgeir Moan, Xujun Chen, and Weicheng Cui. "Hydroelastic analysis of flexible floating interconnected structures." Ocean Engineering 34, no. 11-12 (August 2007): 1516–31. http://dx.doi.org/10.1016/j.oceaneng.2007.01.003.

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30

Domínguez, José M., Alejandro J. C. Crespo, Matthew Hall, Corrado Altomare, Minghao Wu, Vasiliki Stratigaki, Peter Troch, Lorenzo Cappietti, and Moncho Gómez-Gesteira. "SPH simulation of floating structures with moorings." Coastal Engineering 153 (November 2019): 103560. http://dx.doi.org/10.1016/j.coastaleng.2019.103560.

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31

Wang, Kun, Guo-Kang Er, and Vai Pan Iu. "Nonlinear dynamical analysis of moored floating structures." International Journal of Non-Linear Mechanics 98 (January 2018): 189–97. http://dx.doi.org/10.1016/j.ijnonlinmec.2017.10.025.

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32

Amirikian, Arsham. "4708081 Stabilizer for floating and submersible structures." Marine Pollution Bulletin 19, no. 4 (April 1988): 188–89. http://dx.doi.org/10.1016/0025-326x(88)90686-8.

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33

Lee, Kang-Heon, and Phill-Seung Lee. "Nonlinear hydrostatic analysis of flexible floating structures." Applied Ocean Research 59 (September 2016): 165–82. http://dx.doi.org/10.1016/j.apor.2016.05.016.

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34

Pick, Marc-André, Edwin Kreuzer, and Jörg Wagner. "Analysis of critical motions of floating structures." PAMM 6, no. 1 (December 2006): 323–24. http://dx.doi.org/10.1002/pamm.200610143.

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35

Zhang, Ruo Yu, Chao He Chen, You Gang Tang, and Xiao Yan Huang. "Research Development and Key Technical on Floating Foundation for Offshore Wind Turbines." Advanced Materials Research 446-449 (January 2012): 1014–19. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1014.

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The water area in which water depth is deeper than 50m has special advantage in wind turbine generation, because there are the stable wind speed and small Wind-shear. In such sea area, the offshore wind energy generating equipments should be set up on floating foundation structure. Therefore, it is of great significance to study the floating foundation structures that are available for offshore wind energy generation for the industrialization of the offshore wind power generation. In this paper, the basic type and working principles are reviewed for some novel floating structures developed in recent year. In addition, some key dynamical problems and risk factors of the floating structure are systemically analyzed for working load caused by turbine running and sea environment loads of floating structure. The results are valuable for designing the floating structures of wind turbine generation.

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36

Schmidt, Wolfgang, Peter Strangfeld, Eduard Volker, and Yaraslau Sliavin. "Numerical simulation of the movement behavior of floating structures." Real estate: economics, management, no. 2 (June 24, 2021): 55–62. http://dx.doi.org/10.22337/2073-8412-2021-2-55-62.

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The sea level is rising, and floods threaten the infrastructure all over the world; therefore, we should identify the risks for envelops of buildings and settlements. The risks arise due to the new boundary conditions and a direct contact between the water flows in motion. A floating construction site requires a manifold adaptation of structures. The paper demonstrates the effect of water waves on floating houses built on abandoned open pit mines. Pictures of destroyed accessways to such properties have proven the need to study the effect of water waves on floating houses. In order to minimize the time and spending on experimental activities, some of the field studies should be replaced by numerical simulations using modern computing equipment and ANSYS FLUENT, ANSYS MECHANICAL FSI, and ANSYS AQWA software. The results can be validated using a hydraulic testing channel (15 x 5 m), a floating platform near the harbor of Lake Gro r schener See and floating houses in the Lusatian Lakeland. The results demonstrate the wave forces acting on the structures of the pontoons. New connection elements, adapted versions of materials and structures have been developed, water waves are damped, and options for the wave energy use have been analyzed.

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37

Kizilova, Svetlana. "Form and functional features of modular floating structures." E3S Web of Conferences 91 (2019): 05013. http://dx.doi.org/10.1051/e3sconf/20199105013.

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The article describes the main aspects of form and functional organization of modular architecture on the water. The leading approach to the study is based on the system analysis of the types of modular floating foundations, above-water structures of various configurations and their functions. As a result of the analysis of realized and conceptual projects, two types of modular bases were identified: simple, consisting of repeating geometric forms (square, rectangle, circle, hexagon), and complex. The main typologies of above-water structures are also highlighted: a pavilion, a low-rise and a high-rise building. The study examined the main programs that floating structures provide: residential, public and industrial. Characteristic features of the modular floating structures are drawn on the basis of the identified classifications. The article can be used for practical and conceptual research in the field of modular architecture and structures in the water environment.

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38

Chakrabarti, S. K., and D. C. Cotter. "Motions of Articulated Towers and Moored Floating Structures." Journal of Offshore Mechanics and Arctic Engineering 111, no. 3 (August 1, 1989): 233–41. http://dx.doi.org/10.1115/1.3257152.

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A versatile and efficient method of analysis has been developed to analyze a mooring system composed of a floating structure, e.g., a ship, mooring lines, fenders, and an articulated tower. The floating structure is assumed to be large, but may have an arbitrary shape, and the tower is assumed to be axisymmetrical. Although the program treats the floating structure and tower as a system, each body may be examined alone in the absence of the other. The analysis is carried out in the time domain assuming rigid body motion, and the solution is generated by a forward integration scheme. This approach permits nonlinear line and fender forces to be incorporated readily into the analysis. The exciting forces in the analysis are wind, current, and waves, which are not necessarily collinear. The waves can be single frequency or composed of multiple frequency components. The vessel is free to respond to the exciting forces in six degrees of freedom—surge, heave, sway, roll, pitch, and yaw. The tower is free to respond in two degrees of freedom—oscillation and precession. The analysis has been extensively verified with several different model tests for different structure configurations in regular and random seas. These include an articulated tower, a single-point mooring tanker system, a floating caisson and an inclined mooring tower.

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39

Ghasemi, Hadi, Morteza Kolahdoozan, Enrique Pena, Javier Ferreras, and Andrés Figuero. "A NEW HYBRID ANN MODEL FOR EVALUATING THE EFFICIENCY OF Î -TYPE FLOATING BREAKWATER." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 25. http://dx.doi.org/10.9753/icce.v35.structures.25.

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Floating breakwaters (FBs) have been specially regarded in recent years as a means to protect small harbors and marine structures against affection of short period waves. FBs have different types in terms of geometric shapes; one of the most common of which is the Ï€-type FB. Generally, FBs are designed to reduce wave energy. The parameter used to evaluate the efficiency of FBs in the wave energy reduction is the wave transmission coefficient (Kt). Thus, accurate estimate of Kt is an important aspect in FBs design. In the present study, new hybrid artificial neural network (ANN) models are developed for predicting Kt of Ï€-type FBs. Actually, a new algorithm that combines particle swarm optimization (PSO) and Levenberg-Marquardt (LM) is used for learning ANN models. These models are developed by the use of experimental data sets obtained from the Kt of Ï€-type FBs using a wave basin of the University of a CoruÃ±a, Spain. A proposed model performance was evaluated and results show that this model can be successfully applied for the prediction of the Kt. Also, results of proposed model show that the efficiency of this model is improved in compare with the introduced formulas cited in the literature. After assuring the acceptability of the prediction results, this model as one of an efficient tool was used for extending the experimental data and selection of the optimal design of Ï€-type FBs in terms of the geometric characteristics.

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40

Nasma Noor, N. V., and A. P. Shashikala. "Resonant Motion of Liquid Confined between Floating Structures." Applied Mechanics and Materials 567 (June 2014): 289–94. http://dx.doi.org/10.4028/www.scientific.net/amm.567.289.

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Many applications occur in the field of marine hydrodynamics where two or more vessels are in sufficiently close proximity to experience significant wave action. The motion of such floating bodies in waves is frequency dependent. In the case of multiple floating bodies, when resonance occurs, the effect of confined liquid between the bodies has some serious implications on the safety and operation of the offloading system. The main objective of the work is to determine the hydrodynamic behaviour of two bodies freely floating in water. A frequency domain method is adopted for the prediction of the resonant frequency. 3D linear diffraction radiation analysis is used to solve the problem. Structures are modelled in ANSYS AQWA and analysed in selected range of frequency with different spacing. As the spacing increases the resonant frequency in roll is found to be decreasing for both ship and tugboat and the frequency shift between the two is increasing. The wave elevation pattern within the spacing has been observed and the result has been shown for different spacings.

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41

Zhang, Zhiyang, Weixing Liu, Xiongbo Zheng, Hengxu Liu, and Ningyu Li. "Numerical simulation of hydrodynamic oscillation of side-by-side double-floating-system with a narrow gap in waves." Open Physics 19, no. 1 (January 1, 2021): 188–207. http://dx.doi.org/10.1515/phys-2021-0021.

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Abstract In offshore oil and gas exploration and transportation, it is often encountered that the multi-floating structures work side by side. In some sea conditions, there is a strong coupling between the multi-floating structures that seriously affects the safety of offshore operations. Therefore, the prediction of the relative motion and force between the multi-floating structures and the wave elevation around the multi-floating-system has become a hot issue. At present, the problem of double-floating-system is mostly based on linear potential flow theory. However, when the gap width between two floating bodies is small, the viscous and nonlinear effects are not negligible, so the potential flow theory has great limitations. Based on the viscous flow theory, using the finite difference solution program of FLOW3D and using volume of fluid technology to capture the free surface, a three-dimensional numerical wave basin is established, and the numerical results of the wave are compared with the theoretical solution. On this basis, the hydrodynamic model of side-by-side double-floating-system with a narrow gap is established, and the flow field in the narrow gap of the fixed double-floating-system under the regular wave is analyzed in detail. The law of the gap-resonance is studied, which provides valuable reference for the future research on the multi-floating-system.

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42

Lu, Ye, Qijia Shi, Yuchao Chen, Wenhui Zheng, and Ye Zhou. "Response Suppression of Multiple Hinged Floating Structures by Using Rubber Cushion." Shock and Vibration 2021 (August 26, 2021): 1–17. http://dx.doi.org/10.1155/2021/1208336.

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A brand-new rubber cushion is proposed in this paper, which is installed between hinged floating modules in order to reduce the relative motion of the pitch; meanwhile, the cushion can be used as a fender for anti-impact in the docking process. Using the linear wave potential method, the structural dynamic model is formulated where the equivalent stiffness matrix for the rubber cushion is obtained by an integrating method employing linear assumption in addition to considering the heterogeneity of rubber. A numerical analysis is presented for a two-module semisubmersible floating structure. The hydrodynamic responses and connector loads of the floating structures with a rubber cushion are analyzed by using the frequency domain approach in both regular and irregular waves. The topological design and stiffness parameter selection of the rubber cushion is studied. This work may provide a new idea for suppressing the pitch motion of multiple hinged floating structures.

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43

LEE, Kwangho, Norimi MIZUTANI, and Hiroki YAMADA. "EXPERIMENTAL STUDY ON WAVE INTERACTIONS WITH FLOATING STRUCTURES AND FLOW CHARACTERISTICS AROUND FLOATING BODIES." Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67, no. 2 (2011): I_232—I_237. http://dx.doi.org/10.2208/jscejoe.67.i_232.

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NAKAHIRA, Tatsuya, Taro KAKINUMA, Ko YAMAMOTO, Kei YAMASHITA, and Takahiro MURAKAMI. "Can Very Large Floating Structures Reduce Tsunami Height?" Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 70, no. 2 (2014): I_911—I_915. http://dx.doi.org/10.2208/kaigan.70.i_911.

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45

HAMAMOTO, Takuji, and Ken-ichi FUJITA. "WATER TANK EXPERIMENT OF SHAPE-VARIABLE FLOATING STRUCTURES." Journal of Structural and Construction Engineering (Transactions of AIJ) 81, no. 724 (2016): 1039–49. http://dx.doi.org/10.3130/aijs.81.1039.

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46

Gaudin, Christophe, Mark J. Cassidy, Conleth D. O'Loughlin, Yinghui Tian, Dong Wang, and Shiaohuey Chow. "Recent Advances in Anchor Design for Floating Structures." International Journal of Offshore and Polar Engineering 27, no. 1 (March 1, 2017): 44–53. http://dx.doi.org/10.17736/ijope.2017.jc673.

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FUJITA, Ken-ichi, and Takuji HAMAMOTO. "HYDROELASTIC RESPONSE OF MODULE-LINKED LARGE FLOATING STRUCTURES." Journal of Structural and Construction Engineering (Transactions of AIJ) 68, no. 571 (2003): 193–200. http://dx.doi.org/10.3130/aijs.68.193_2.

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48

Yoshida, Koichiro, Hideyuki Suzuki, and Taro Ide. "Systematic Analysis on Mooring Systems of Floating Structures." Journal of the Society of Naval Architects of Japan 1996, no. 180 (1996): 165–74. http://dx.doi.org/10.2534/jjasnaoe1968.1996.180_165.

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Newman, J. N. "Efficient hydrodynamic analysis of very large floating structures." Marine Structures 18, no. 2 (March 2005): 169–80. http://dx.doi.org/10.1016/j.marstruc.2005.07.003.

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Lotsberg, Inge, and Einar Landet. "Fatigue capacity of side longitudinals in floating structures." Marine Structures 18, no. 1 (January 2005): 25–42. http://dx.doi.org/10.1016/j.marstruc.2005.08.002.

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