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Prediction on hydroelastic responses of very large floating structure with the eigenfunction expansion-matching method

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INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY 2020年第4期62卷 338-347页

作者： Wan Zhinan Zhai Gangjun Cheng Yong CCCC FHDI Engn Co Ltd Guangzhou 510230 Peoples R China Dalian Univ Technol Deep Sea Engn Res Ctr Dept Construct Engn Dalian 116024 Peoples R China Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang 212003 Jiangsu Peoples R China

This paper investigates the hydroelastic responses of a mat-like, rectangular very large floating structure (VLFS) with analytical method. The VLFS is considered as a two-dimensional thick plate and the wave linearity theory is employed. The flow field is divided into three regions and the eigenfunction expansion-matching method is applied in determining the velocity potential of each region, and then the Rayleigh-Ritz method is used to solve the elastic equation of motion. The analytical method is verified by comparing with the published numerical and experimental results. The elastic deformation and wave exciting force of the VLFS are computed and the effects of water depth, wavelength, draft and stiffness on the elastic deformation of the VLFS are further discussed. The deformation increases with the increase of wavelength in general, decreases with the increase of stiffness, increases slightly with the increase of draught, and does not change significantly with the depth of water.

关键词： very large floating structure eigenfunction expansion-matching method Rayleigh-Ritz method hydroelastic response

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Hydroelastic Response of VLFS with An Attached Submerged Horizontal Solid/Porous Plate Under Wave Action

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China Ocean Engineering 2020年第4期34卷 451-462页

作者： FENG Ming-wei SUN Zhao-chen LIANG Shu-xiu LIU Bi-jin State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering and Architecture Xiamen University of TechnologyXiamen 361024China

The hydroelastic responses of a submerged horizontal solid/porous plate attached at the front of a very large rectangular floating structure(VLFS)under wave action has been investigated in the context of linear water wave ***’s law is adopted to represent energy dissipation in *** is assumed that the porous plates are made of material with very fine pores so that the normal velocity across the perforated porous is linearly associated with the pressure *** the analytic method,the eigenfunction expansion-matching method(EEMM)for multiple domains is applied to solve the hydrodynamic problem and the elastic equation of motion is solved by the modal expansion *** performance of the proposed submerged horizontal solid/porous plate can be significantly enhanced by selecting optimal design parameters,such as plate length,horizontal position,submerged depth and *** is concluded that good damping effect can be achieved through installation of solid and porous *** plate has better damping effect at low frequencies,while solid plate has better damping effect at high *** optimal ratio of plate length to water depth is 0.25-0.375,and the optimal ratio of submerged depth to water depth is 0.09-0.181.

关键词： VLFS hydroelastic response Darcy’s law eigenfunction expansion-matching method submerged horizontal solid/porous plate

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Overview: Research on wave loading and responses of VLFS

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MARINE STRUCTURES 2005年第2期18卷 149-168页

作者： Ohmatsu, S Ocean and Ice Engineering Department National Maritime Research Institute of Japan Japan

For the basis of the design and operation of very large floating structures (VLFS), the comprehension of the hydroelastic behavior of VLFS is indispensable. Various methods have been proposed in order to predict the hydroelastic responses of VLFS to waves and other external loads during the Mega-float project in Japan. By virtue of these many studies, we can now confidently estimate the hydroelastic responses with good accuracy. This paper categorizes and presents a brief outline of these estimation methods. The analytical considerations of hydroelastic waves are also provided and compared to the numerical results. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： VLFS Mega-float hydroelastic response mode-expansion method integral-equation method eigenfunction expansion-matching method modified dispersion relation modified free surface condition optics slowly varying wave drift force

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Dual inclined perforated anti-motion plates for mitigating hydroelastic response of a VLFS under wave action

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OCEAN ENGINEERING 2016年 121卷 572-591页

作者： Cheng, Yong Ji, Chunyan Zhai, Gangjun Oleg, Gaidai Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang 212003 Peoples R China Dalian Univ Technol Deepwater Engn Res Ctr Dalian 116024 Peoples R China Norwegian Univ Sci & Technol Ctr Ships & Ocean Struct NO-7491 Trondheim Norway

This paper investigates the hydroelastic responses of a mat-like, rectangular very large floating structure (VLFS) edged with dual horizontal/inclined perforated plates using analytic method, numerical method and experimental test. In the analytic method, the eigenfunction expansion-matching method (EEMM) for multiple domains is applied to evaluate the diffraction and radiation potentials, and then the elastic equation of motion is solved by the Rayleigh-Ritz method. In the numerical model, the modal eigenvector equation of the VLFS with some discrete Mindlin plate elements are obtained by using the finite element method (FEM), whereas the boundary element method (BEM) is applied to solve the water wave equation. The hybrid finite element method-boundary element method (FEM-BEM) solutions are further employed for more general cases including inclined perforated anti-motion plates. Both analytic and numerical solutions are also validated against a series of experimental tests. The effectiveness of dual perforated plates in reducing the deflections of VLFS, is systematically assessed for various wave and plate parameters, and the performance of the anti-motion device can be significantly improved by selecting the proper design parameters. Based on the selected optimal parameters, the response reduction of VLFS with different locations of lower perforated plate is further highlighted. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Very large floating structure (VLFS) Hydroelastic response Dual perforated anti-motion plates eigenfunction expansion-matching method Experiment

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Numerical calculation method for the hydroelastic response of a pontoon-type very large floating structure close to a breakwater

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Journal of Marine Science and Technology 2001年第4期5卷 147-160页

作者： Ohmatsu, Shigeo Ocean Engineering Division Ship Research Institute Mitaka Tokyo 181-0004 6-38-1 Shinkawa Japan

This paper presents an effective scheme for calculating the wave-induced hydroelastic response of a pontoon-type very large floating structure (VLFS) when it is near a breakwater. The basic numerical calculation method is the one previously developed by the same author for a VLFS in the open sea (no breakwater), which is expanded to include the effect of the hydrodynamic mutual interaction between the breakwater and the floating structure. The efficiency and accuracy of the proposed method are validated through comparisons with other numerical results and with existing experimental results. After that confirmation, various numerical calculations were conducted, paying special attention to the resonance phenomena which will occur depending on the relation between the wavelength and the clearance between the breakwater and the floating structure. The irregular frequency phenomenon which appears in the calculation of the fluid dynamic problem is discussed in the appendices, including a method for its elimination. © SNAJ 2000.

关键词： Breakwater eigenfunction expansion-matching method Hydroelasticity Irregular frequencies Mode-expansion method Very large floating structure VLFS

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The inclusion of non-linearities in a mathematical model for U-Oscillating Water Column wave energy converters

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ENERGY 2021年 218卷 119320-119320页

作者： Scandura, Pietro Malara, Giovanni Arena, Felice Univ Catania Dept Civil Engn & Architecture Via Santa Sofia 64 I-95123 Catania Italy Mediterranea Univ Reggio Calabria Nat Ocean Engn Lab NOEL I-89122 Reggio Di Calabria Italy

A mathematical model for U-Oscillating Water Column (U-OWC) wave energy converters is developed and tested. The model is based on the linear irrotational wave theory but is able to treat different nonlinearities related to the physical processes involved in the U-OWC dynamics. These nonlinearities include those due to not small oscillations of the free surface in the air chamber and to the air transformation, as well as those related to the characteristics of the air turbine. An approach to include into the model the flow resistances encountered by the flow within the U-OWC is also presented. The model was tested using both laboratory and field experimental data. The latter were obtained using a physical model of a U-OWC installed on the coast. The results show that the model accurately computes the hydrodynamic quantities involved in the U-OWC dynamics. An application of the mathematical model to a real scale U-OWC subject to random waves compatible with a JONSWAP spectrum is presented. The nonlinear part of this model can be incorporated in other linear models of oscillating water column devices already appeared in the literature (H. Martins-Rivas and C.C. Mei, Journal Fluid Mech. 2009). (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Wave energy U-Oscillating Water Column eigenfunction expansion-matching method Non linear model

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