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Frequency-domain approach of hydroelastic response for flexible offshore floating photovoltaic under combined wind and wave loads

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OCEAN ENGINEERING 2025年 323卷

作者： Shi, Yongkang Wei, Yanji Chen, Kuixiao Xin, Chuanlong Tay, Zhi Yung Chen, Zuogang Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai 200240 Peoples R China Ningbo Inst Digital Twin Eastern Inst Technol Ningbo 315201 Zhejiang Peoples R China Shanghai Jiao Tong Univ Sch Ocean & Civil Engn Shanghai 200240 Peoples R China Singapore Inst Technol Engn Cluster Singapore 138683 Singapore

This study proposes a frequency-domain approach of hydroelastic analysis for evaluating the motion response of flexible offshore floating photovoltaic (FOFPV) systems under combined wind and wave loads. This approach extends the discrete-module-beam hydroelastic approach to a discrete-module-finite-element hydroelastic approach, addressing the limitation of the beam model, which lacks sufficient nodes to account for the detailed distribution of wind loads. By incorporating the inhomogeneous wind load distribution and coupling structural, hydrodynamic, and aerodynamic forces, the dynamic equations of the flexible structure are established, and the system's motion response is obtained through solving these equations. Results indicate that the bending moment is overestimated by at least three times in the rigid model compared to the elastic model under combined wind and wave loads. Furthermore, when the equivalent stiffness, which corresponds to the structural flexural stiffness, falls below 1e6 N/m, wind loads significantly influence the structural motion response. This approach provides theoretical support for the design and optimization of FOFPV systems.

关键词： Flexible offshore floating photovoltaic hydroelastic response Combined wind-wave loads Discrete module finite element Discrete module finite element Boundary element method

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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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hydroelastic response of a matlike floating circular plate advancing in waves

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JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME 2007年第3期129卷 201-210页

作者： Matsui, Tetsuya Meijo Univ Dept Architecture Tenpaku Ku Nagoya Aichi 4688502 Japan

The boundary value problem is formulated to predict the hydroelastic response of a matlike floating circular plate advancing slowly in waves. The plate is idealized as an elastic plate with zero draught, and the potential flow theory is employed with low forward-speed assumptions. These assumptions allow, the steady disturbance potential due to forward speed to be neglected, simplifying the problem considerably. BY applying the eigeqfunction-expansion domain-matching method, analytical solutions are derived for the scattering and radiation potentials up to the leading-order terms of the speed-dependent parts. The far-field approach is adopted to obtain the expression for the wave drift force. Numerical results arc also presented for the typical plate geometry, which demonstrates the significant effect of the forward speed on the hydroelastic response and wave drifit force.

关键词： very large floating structure hydroelastic response forward speed wave-current interaction wave drift damping towing

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hydroelastic response analysis of pneumatically supported floating structures using a BEM-FEM coupling method

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KSCE JOURNAL OF CIVIL ENGINEERING 2016年第7期20卷 2875-2884页

作者： Hong, Sanghyun Lee, Jong Seh Hanyang Univ Dept Civil & Environm Engn Ansan 15588 South Korea Hanyang Univ Dept Civil Environm & Plant Engn Ansan 15588 South Korea

Pneumatically supported floating structures, which utilize an aircushion below the structural bottom, have been suggested to remedy the excessive hydroelastic response of the conventional pontoon-type floating structures. This paper presents an analytical study to examine the hydroelastic responses of the pneumatically supported floating structures. For the hydroelastic analysis, the fluid is modeled as a 2D-strip of finite depth seawater whereas the floating structure is modeled as a beam with zero-draft. A direct coupled model is then constructed by using the boundary integral formulation for the fluid and FEM for the structure and by incorporating a pneumatic factor at the fluid-structure interface to consider the compressibility of the aircushion. For case studies, hydroelastic responses of the pneumatically supported type are compared to those of the pontoon-type for a wide range of pneumatic factors and regular waves. It is shown that the pneumatic supports can significantly reduce the hydroelastic responses in general and that the response reduction may be greatly enhanced when the pneumatic factor is chosen as small as possible for a relatively short incident wave. This study demonstrates that the analytical technique proposed herein can be used to examine the design conditions which are essential for practical applications of the pneumatically supported floating structures.

关键词： pneumatically supported floating structure pneumatic factor hydroelastic response very large floating structure beam on elastic foundation boundary integral formulation

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hydroelastic response of cylindrical shell structures during earthquakes in ice-covered seas

Hydroelastic response of cylindrical shell structures during...

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12th International Offshore and Polar Engineering Conference (ISOPE-2002)

作者： Hamamoto, T Nojima, T Musashi Inst Technol Dept Architecture Tokyo 158 Japan

ISBN: (纸本)1880653583

An analytical approach is presented for the seismic hydroelasticity of fixed cylindrical shell structures in ice-covered seas. The sea surface is regarded as the combination of free surface and solid boundary. Both the confined effect due to the surrounding ice sheet and the dissipated effect due to the structure-ice gap are considered for the evaluation of earthquake forces in ice-covered seas. Hydrodynamic pressures are derived in closed forms by the domain division method. Wet mode properties are obtained by the Rayleigh-Ritz method. Seismic responses are evaluated by wet mode superposition and random vibration approaches. Based on the numerical results, the changes in wet mode properties, hydrodynamic pressures and response quantities due to confined and dissipated effects are investigated.

关键词： earthquake force ice-covered seas hydroelastic response cylindrical shell confined effect dissipated effect

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hydroelastic response analysis of a large underwater shell of revolution

Hydroelastic response analysis of a large underwater shell o...

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12th International Offshore and Polar Engineering Conference (ISOPE-2002)

作者： Toyota, K Yasuzawa, Y Kagawa, K Kyushu Univ Fukuoka 812 Japan

ISBN: (纸本)1880653583

Static and dynamic responses of underwater structures which might be used as LNG storages or underwater stations have been studied by the authors recently for one of the structural feasibility studies. Research on submerged axisymmetric shells such as cylindrical, hemisphere, or drop shaped shells is needed for realization in the future, because they are very useful and rational structural system as marine structures. Half Drop-shaped shells are optimum-shaped shell structures, in which the membrane stresses in the shells caused by hydrostatic pressure is uniform. Furthermore the authors have been studying dynamic characteristics of axisymmetric underwater shells with the effect of added mass of water experimentally and numerically in order to study the dynamic problems such as seismic response. As the result, the dynamic characteristics of the shells neglecting the influence of water waves on free surface has been clarified. But effect of water waves induced by dynamic motion and deformation of the shell have to tie considered as the next step of the study for precise prediction of dynamic response of the underwater shell. Then, it is necessary to solve the hydroelastic problems of underwater shells of revolution by analyzing diffraction problem and radiation problem with waves. In the present report, firstly we have developed a numerical code, in which finite elements method for the structure and boundary element method for surrounding water, that is, the sea are used for analyzing diffraction and radiation problem of underwater shell of revolution in the sea. To compare with the results of our numerical code to the results of other paper, we have confirmed the validity of our code. Finally,the fluid velocity potential distribution of shell surface is obtained by the use of our code, and dynamic characteristics of axisymmetric underwater shell in random waves have been examined and discussed.

关键词： axisymmetric shell hydroelastic response water wave

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hydroelastic response of Interconnected Floating Beams over Varying Seabed Profile

Hydroelastic Response of Interconnected Floating Beams over ...

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8th ISOPE Pacific/Asia Offshore Mechanics Symposium

作者： Riyansyah, Muhammad Wang, C. M. Choo, Y. S. Natl Univ Singapore Dept Civil Engn Ctr Offshore Res & Engn Singapore 117548 Singapore

ISBN: (纸本)9781880653524

This paper is concerned with the hydroelastic response of multiple floating beams connected together by mechanical joints with rotational spring stiffness under wave action. A frequency domain approach is developed for the hydroelastic analysis. The fluid is assumed to be incompressible, inviscid and its motion irrotational so that a velocity potential exists and thus the fluid motion is governed by the Laplace's equation. The floating beams are modelled by the Timoshenko beam theory which allows for the effects of transverse shear deformation and rotary inertia. The boundary element method (BEM) is used to solve the governing equation and boundary conditions of the fluid domain. The finite element method (FEM) is employed for solving beam equation of motion. The study investigates the effects of shear deformation and rotary inertia, relative beam stiffnesses, rotational stiffness of mechanical joints, and the varying seabed profile on the hydroelastic responses of the interconnected floating beams.

关键词： VLFS hydroelastic response boundary element method finite element method frequency domain timoshenko beam

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hydroelastic response OF SUBMERGED FLOATING TUNNEL

HYDROELASTIC RESPONSE OF SUBMERGED FLOATING TUNNEL

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作者： JIAXING CHEN Texas A&M University

学位级别：硕士

This research investigation addresses the analysis and numerical simulation of dynamic response of submerged floating tunnels (SFTs) under the influence of surface waves. As an innovative technical solution for waterway crossings, an SFT is usually considered as a slender structure restrained by cable system due to its large aspect ratio, i. e. ratio of length to diameter. Although an SFT is usually placed at a certain depth under the water surface, it is still susceptible to wave field due to its slenderness. In this research study, a three-dimensional finite element solving technique, using both Morison's equation and modal analysis, is formulated to construct a hydroelastic model of an SFT and to determine its deformation considering the fluid-structure interactions. Two preliminary tunnel models for China and Japan, respectively, were studied by implementing the proposed methodology. In the first case study, a three-dimensional finite element model of the SFT prototype in Qiandao Lake (China) was built in Matlab and subsequently analyzed using mode decomposition to determine its natural frequencies and mode shapes. For each mode shape, Morison's equation was employed to calculate fluid forces at each cross section along the tunnel for given surface wave conditions. Then in the frequency domain, a complex equation of motion was solved iteratively to address the convergence of the stiffness of the cable system. The total dynamic response of SFT was the sum of contributions from each mode component. Results obtained from Matlab were compared with findings from previous publications and numerical simulations in ABAQUS. Next, a generic pedestrian-aimed SFT proposed for Otaru Crossing in Japan was studied. Parametric studies were performed to evaluate the influence of configuration scheme of cable system and tunnel submerged depth on the dynamic response of SFT. Results show the importance of fundamental structural parameters in the SFT global performance and several

关键词： hydroelastic response Submerged Floating Tunnel Modal Analysis Morison’s Equation FEM Thesis

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Research on the hydroelastic response of Ice Floes and Wave Scattering Field

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JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME 2024年第5期146卷 051201页

作者： Zhang, Xi Li, Tingqiu Liu, Zuyuan Wuhan Univ Technol Sch Naval Architecture Ocean & Energy Power Engn Key Lab High Performance Ship Technol Wuhan 430063 Peoples R China

The marginal ice zone (MIZ) is the area between sea ice and open water, the structure of which is mainly determined by wave and ice interactions. Thus mastering the characteristics of MIZ is of great significance to the Arctic routes opening and the natural resources development. In this paper, the hydroelastic response of ice floes in waves is studied, a three-dimensional numerical wave tank is established based on the computational fluid dynamics technology. The finite volume method and finite element method are respectively utilized for the discrete fluid domain and ice domain. A mapping interface at the junction of the fluid and ice floes domains is created to perform data mapping by the shape function interpolation method and the least square method. This work presents a series of numerical simulations to study the fluid-solid interaction of waves and ice floes. Under the given incident wave parameters, the vertical bending deformation of ice floes with different shapes under the excitation of waves, the effect of ice floes' deformation on the wave field are studied, and the effect of wave overwash on the transmitted wave field is emphasized. Results show that the shape of the ice floes significantly affects its elastic deformation and scattered wave field, and the wave overwash phenomenon attenuates the scattering wave.

关键词： ice floe marginal ice zone overwash fluid-solid interaction hydroelastic response

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Numerical simulation of transient hydroelastic response of a floating beam induced by landing loads

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APPLIED OCEAN RESEARCH 2007年第3期29卷 91-98页

作者： Qiu, Liu-Chao China Agr Univ Dept Appl Mech Beijing 100083 Peoples R China

The dynamic response of a floating platform under the effects of impulsive and moving loads is of concern in various areas of engineering technology, such as floating airports, floating bridges and buoyant tunnels, among others. In the present work, the floating platform is simplified as a flexible beam floating in an infinite water domain. The water is assumed to be compressible and inviscid, whose governing equation is formulated in terms of the hydrodynamic pressure variable. The surface disturbance satisfies a linear free-surface wave condition and a radiation wave condition at an artificially truncated boundary. A time-domain finite element model is developed to analyze this fluid-structure interactive dynamical system, which exhibits strong coupling between the system's components. The numerical results are compared with the experimental and numerical ones. The results of comparison confirmed the validity of the proposed approach. The influences on the dynamic responses of floating beam of some factors were studied. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： hydroelastic response floating beams transient response landing loads time-domain analysis finite element method (FEM)

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