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Experimental Study of Mooring Type Effect on the Hydrodynamic Characteristics of VLFS

China Ocean Engineering 2022年第1期36卷 155-166页

作者： FENG Ming-wei SUN Zhao-chen LIANG Shu-xiu LI Zhi LV Xuan JIA Song-lin HUXin-yue State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Mooring system is a significant part of very large offshore floating structures(VLFS).In this paper,a single module pontoon type VLFS model considering four mooring types is studied through physical model tests to determine the effects of mooring conditions on the hydroelastic response,mooring force,incident coefficient,reflection coefficient and energy dissipation *** mooring cables are symmetrically arranged on both sides of the *** floating body model satisfies the similarity of stiffness and gravity,while the cable satisfies the similarity of elasticity and *** results show that the effect of mooring type on mooring force is greater than that on hydroelastic *** the initial tension of the mooring cable will reduce the amplitude of the leeward of the VLFS *** mooring angle of the mooring cable will affect the maximum mooring force and the initial tension of the mooring line will affect the wave period in which the maximum mooring force *** transmission coefficient and wave energy dissipation coefficient will change regularly with different mooring *** results may provide a reference to facilitate the mooring design of VLFS.

关键词： VLFS hydroelastic response mooring system 3D experimental test mooring force wave reflection coefficient wave transmission coefficient wave dissipation coefficient

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hydroelastic interaction between water waves and a thin elastic plate of arbitrary geometry

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Science China(Physics,Mechanics & Astronomy) 2011年第1期54卷 59-66页

作者： XU Feng LU DongQiang Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072 China

An analytical method is developed for the hydroelastic interaction between surface incident waves and a thin elastic plate of arbitrary geometry floating on an inviscid fluid of finite depth in the framework of linear potential *** kinds of edge conditions are considered and the corresponding analytical representations are derived in the polar coordinate *** to the surface boundary conditions,the fluid domain is divided into two regions,namely,an open water region and a plate-covered *** the assumption that all the motion is time-harmonic,the series solutions for the spatial velocity potentials are derived by the method of eigenfunction *** matching conditions for the continuities of the velocity and pressure are transformed by taking the inner products successively with respect to the vertical eigenfunction for the free surface and the angular eigenfunction.A system of simultaneous equations,including two edge conditions and two matching conditions,is set up for deriving the expansion *** an example,numerical computation for the expansion coefficients of truncated series is performed for an elliptic *** results show that the method suggested here is useful to revealing the physical features of the gravity wave scattering in the open water and the hydroelastic response in the plate.

关键词： wave scattering method of matched eigenfunction expansions elastic plate arbitrary geometry hydroelastic response

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On the Interaction of Surface Waves with An Elastic Plate of Finite Length in Head Seas

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China Ocean Engineering 2002年第1期17卷 21-32页

作者：孙辉宋皓崔维成刘应中 School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong UniversitySchool of Naval Architecture and Ocean EngineeringShanghai Jiao Tong UniversitySchool of Naval Architecture and Ocean EngineeringShanghai Jiao Tong UniversitySchool of Naval Architecture and Ocean EngineeringShanghai Jiao Tong University Shanghai 200030ChinaShanghai 200030ChinaShanghai 200030ChinaShanghai 200030China

An eigen-function expansion method based on a new orthogonal inner product is proposed by Sahoo et al. (2000) for the study of the hydroelastic response of mat-type VLFS in head seas. However, their main emphasis is on the effect of edge conditions and they assume that the plate is of a semi-infinite length. In reality, the plate is of finite length. For consideration of the finite length effect, the reflection and transmission from the other end must be considered. The effect of this reflection and transmission on the hydroelastic response of VLFS is of interest for practical application. Furthermore, the physical meaning of the new inner product was not given in their paper. In this paper, it is shown that the new inner product can he derived from the governing equation and the bottom boundary conditions. Then the same eigen-function expansion method is adopted for the study of the hydroelastic response of an elastic plate of finite length in surface waves. Detailed comparisons are made between the present finite length model and the semi-infinite model and between the present model predictions and the experimental results. It is found that that the finite length effect is significant and the accuracy of present model is higher than the semi-infinite model. Furthermore, a new phenomenon, which is not mentioned in Sahoo et al. (2000), is found. Taht is, for larger L/h ratios, the reflection and transmission coefficients will oscillate with the non-dimensional parameter k(0) h. Further study is needed for full understanding of this phenomenon.

关键词： hydroelastic response very large floating structures (VLFS) elastic plate surface waves

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Investigation of the effect of propeller flexibility on cavitation formation and hydrodynamic coefficients

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JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 2022年第3期27卷 1116-1129页

作者： Sajedi, Hasan Mahdi, Miralam Shahid Rajaee Teacher Training Univ Fac Mech Engn Tehran Iran

In this paper, the dynamical response of a propeller in the cavitation and non-cavitation flows at different rake angles is investigated. Fluid and Structure Interaction (FSI) simulation was performed using ANSYS-CFX software. To simulation the cavitation flow around the propeller, flow is considered as a homogeneous mixture and Zwart-Gerber-Belamri's cavitation model was used. First, the validation of cavitation flow around the E779a propeller was carried out, and considering the comparison of experimental and numerical results, there is a good match between thrust, torque coefficients and volume of cavity. To ensure the simulation of two-way fluid-structure interaction, the results of NACA66 hydrofoil are compared with experimental results, which indicate a good agreement. In the following, the cavitation and non-cavitation flows around the rigid and flexible propellers (B-series) at different rake angles have been investigated. The results show that at uniform flow, changes in rake angle do not have a significant effect on the performance of rigid propellers, while for flexible propellers, the hydrodynamic loads would cause bending and twisting deformations of the blade. Therefore, in the analysis of flexible composite propellers, it is very important to consider the effect of fluid-structural interaction.

关键词： Cavitation flow Flexible propeller hydroelastic response Fluid-structure interaction (FSI) Rake angle

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Investigation on hydrodynamic response and characteristics of a submerged floating tunnel based on hydrodynamic tests

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OCEAN ENGINEERING 2024年 300卷

作者： Liu, Zhongxiang Shi, Xueji Guo, Tong Ren, Hongyu Zhang, Minte Southeast Univ Sch Transportat Nanjing 210096 Peoples R China Southeast Univ Key Lab Concrete & Prestressed Concrete Struct Minist Educ Nanjing 210096 Peoples R China Southeast Univ Sch Civil Engn Nanjing 210096 Peoples R China

This paper presents an investigation on hydrodynamic response and characteristics of the submerged floating tunnel (SFT) based on hydrodynamic tests. Wave pool experiments of a novel scaled model were conducted to explore the hydrodynamic response and characteristics of the SFT, as well as the response changes subjected to local cable breakage. Results indicate that the self-vibration can be more prominent and lead to increasingly nonlinear response characteristics under lower wave excitations. The hydroelastic response of the SFT is sensitive to changes in cable force and negatively correlated with immersion depth. The heave vibration is more sensitive to the changes and the maximum can be up to 37.1 m/s2 about 1.5 times than that in the sway direction. The cable force increases with the wave frequency within a certain threshold and amplitude. Larger cable force constrains the SFT strongly whilst resulting in higher tension range for mooring cables. Local cable breakage led to a suddenly hazardous changes in the response and characteristics of the SFT and subsequent redistribution of cable forces. Noticeable increase of 15.6% in force range was observed for the opposite-side cables of the broken cable in the new stability state, while the same-side cables experienced a slight decrease.

关键词： Ubmerged floating tunnel Hydrodynamic test hydroelastic response Scaled model Mooring cable breakage

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hydroelastic Analysis of Very Large Floating Structures Using Plate Green Functions

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海洋工程：英文版 2003年第2期17卷 151-162页

作者：闫红梅崔维成刘应中 School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University

Great attention has been paid to the development of very large floating structures. Owing to their extreme large size and great flexibility, the coupling between the structural deformation and fluid motion is significant. This is a typical problem of hydroelasticity. Efficient and accurate estimation of the hydroelastic response of very large floating structures in waves is very important for design. In this paper, the plate Green function and fluid Green function are combined to analyze the hydroelastic response of very large floating structures. The plate Green function here is a new one proposed by the authors and it satisfies all boundary conditions for free-free rectangular plates on elastic foundations. The results are compared with some experimental data. It is shown that the method proposed in this paper is efficient and accurate. Finally, various factors affecting the hydroelastic response of very large floating structures are also studied.

关键词： hydroelastic response very large floating structure fluid Green function plate Green function thin plate theory free-free rectangular plate

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Time Domain Simulation of Transient responses of Very Large Floating Structures Under Unsteady External Loads

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China Ocean Engineering 2005年第3期19卷 365-374页

作者：邱流潮刘桦 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200030 China

A time domain finite element method （FEM） for the analysis of transient elastic response of a very large floating structure （VLFS） subjected to arbitrary time-dependent external loads is presented. This method is developed directly in time domain and the hydrodynamic problem is formulated based on linear, inviscid and slightly compressible fluid theory and the structural response is analyzed on the thin plate assumption. The time domain finite element procedure herein is validated by comparing numerical results with available experimental data. Finally, the transient elastic response of a pontoon-type VLFS under the landing of an airplane is computed by the proposed time domain FEM. The time histories of the applied force and the position and velocity of an airplane during landing are modeled with data from a Boeing 747-400 jumbo jet.

关键词： very large floating structure ( VLFS ) hydroelastic response transient analysis time domain landing finite element method (FEM)

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Performance of integrated FB and WEC for offshore floating solar photovoltaic farm considering the effect of hydroelasticity

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OCEAN ENGINEERING 2024年 312卷

作者： Tay, Zhi Yung Singapore Inst Technol Engn Cluster Singapore 138683 Singapore

The offshore floating solar photovoltaic (PV) farm deployed in the open sea could be subjected to large environmental loading due to waves or wakes from travelling ships. To reduce the motion of the solar farm, mitigation methods such as protection of the solar farm via floating breakwater (FB) could be deployed. The FB serves as a buffer between the floating farm and the incoming wave force, and as it attenuates the wave forces, this creates a sheltered zone on the leeward side of the FB. The energy generation from the solar farm could be further enhanced via the integration of attenuator-type wave energy converters (WEC) with the FB. This paper investigates the performance of the hybrid FB - WECs as a coastal protection structure cum wave energy extraction devices. The effect of FB on mitigating the hydroelastic response of the floating solar farm is investigated. Four types of FB, i.e., I-, L-, U- and BOX-shape FBs are considered and their effectiveness in wave attenuation under regular waves arriving from different directions are studied. In addition, due to the long structure length-to-wavelength ratio of the floating solar farm and FB, the hydroelastic response of the structures is taken into consideration.

关键词： hydroelastic response Floating solar photovoltaic farm Hybrid FB - WEC Very large floating structure Modular floating structure

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Energy extraction from an articulated plate anti-motion device of a very large floating structure under irregular waves

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RENEWABLE ENERGY 2019年 130卷 206-222页

作者： Tay, Zhi Yung Singapore Inst Technol Engn Cluster 10 Dover Dr Singapore 138683 Singapore

The deformation of a very large floating structure (VLFS) under wave action is termed hydroelastic response and can be mitigated by using various types of anti-motion devices to enhance the structures' workability. This paper focuses on the energy extraction from an articulated-plate anti-motion device that is connected to a VLFS by hinges. The aim of the paper is to study the feasibility of the articulated plate to function both as an anti-motion device and a wave energy converter such that the hydroelastic response of the VLFS can be reduced and at the same time a substantial amount of wave energy can be generated to power the VLFS. The results show interesting findings on the energy generation by the articulated plate where it was found that the energy generation of the articulated plate and its efficiency as an anti-motion device depend significantly on the length of the articulated plate. The results obtained from the irregular wave show that under a certain combination of significant wave height and wave peak period, (H-s - T-p), it is possible to enhance the workability of the VLFS and ensuring that the VLFS is self-sustained out of renewable sources of energy. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Anti-motion device Very large floating structure hydroelastic response Energy recovery Wave energy converter Irregular wave

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Dynamic response of a flat plate subjected to compression force during vertical and oblique impacts with calm water

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ENGINEERING STRUCTURES 2018年 176卷 697-706页

作者： Moradi, Hashem Ranji, Ahmad Rahbar Haddadpour, Hassan Amirkabir Univ Technol Dept Ocean Engn Tehran 15914 Iran Sharif Univ Technol Dept Aerosp Engn Tehran 111158639 Iran

An existing hydroelastic model is extended for a flat plate subjected to a compression force with spiral spring boundary conditions during water entry. Both vertical and oblique impacts of the plate into calm water are investigated. A longitudinal strip of the plate is analyzed by fully coupling hydrodynamic pressure with elastic responses. Hydrodynamic pressure is determined by potential flow theory and plate deflections are expressed in terms of dry normal modes. The plate deflections are validated through comparison with available asymptotic models, semi-analytical and experimental results. The effect of compression force on the plate deflection is investigated at the midpoint considering different horizontal velocities and inclination angles. Dry and wet frequencies and the minimum threshold values of the compression forces are obtained for plates with different boundary conditions during vertical and oblique impacts. The results show that the plate responses may reach the plastic region at low compression force and high horizontal velocity. It is also found that for all the cases studied yielding occurs before buckling during water impact of the plate.

关键词： hydroelastic response Vertical and oblique impacts Compression force Wet frequency Yielding

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