Marine Structures最新文献_第9页

An integrated hydrodynamic module of FOWTs using accelerated BEM solver and modified Morison coefficients 利用加速边界元求解器和修正的莫里森系数，建立了一种集成的流体力学模型

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-09-05 DOI: 10.1016/j.marstruc.2025.103928

Lilin Wang , Long Teng , Yuliang Liu , Lizhong Wang , Zhen Guo

Hydrodynamics is critical to the stability and safety of floating offshore wind turbines (FOWTs). To improve computational efficiency in the preliminary design stage, frequency-to-time domain potential flow method combined with the Morison equation are commonly used. However, this method lack systematic validation and require multiple tools, leading to complex workflows and inefficient data transfer. To address these challenges, an integrated hydrodynamic module named Zwave is presented in this study, aiming to streamline wave generation, meshing, potential flow analysis, and viscous force calculation. It incorporates advanced features such as parameterized meshing, an accelerated boundary element solver, and amplitude- and frequency-dependent Morison coefficients. Component-level verification shows that Zwave accurately reproduces target wave spectra, and its hydrodynamic results align well with WAMIT in the frequency domain and Orcaflex in the time domain. Furthermore, with corrected Morison coefficients, Zwave successfully captures the resonance responses observed in wave basin tests. Building upon this, system-level validation is performed using field measurements from the Fukushima 2 MW FOWT, demonstrating good agreement in tower base and top bending moments under various sea states.

流体力学对浮式海上风力发电机的稳定性和安全性至关重要。为了提高初始设计阶段的计算效率，通常采用结合Morison方程的频域-时域势流法。然而，这种方法缺乏系统的验证，需要多种工具，导致工作流程复杂，数据传输效率低下。为了解决这些挑战，本研究提出了一个名为Zwave的集成流体动力学模块，旨在简化波浪生成，网格划分，势流分析和粘性力计算。它结合了先进的功能，如参数化网格，加速边界元求解器，以及依赖于振幅和频率的莫里森系数。分量级验证表明，Zwave能准确再现目标波谱，其水动力结果与WAMIT在频域和Orcaflex在时域上吻合较好。此外，通过校正Morison系数，Zwave成功捕获了波盆试验中观测到的共振响应。在此基础上，利用福岛2mw FOWT的现场测量进行了系统级验证，证明了在各种海况下塔底和顶部弯矩的良好一致性。

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引用次数: 0

Performance of small-scale offshore mudmat foundation under uplift and compression loading 近海小型泥滩基础在上拉和压缩荷载作用下的性能

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-09-04 DOI: 10.1016/j.marstruc.2025.103927

Daniel De Andrade Faria, Vinicius Batista Godoy, Fernando Schnaid, Lucas Festugato, Gustavo Dias Miguel

Oil and gas exploration infrastructure installed at the seabed must be decommissioned once the production activities are over. The present study aims to assess the seabed shallow foundation structures (mudmats) behavior by conducting small-scale model tests. These experiments focused on investigating the development of porewater pressure at the foundation base, identifying failure mechanisms, and assessing the influence of loading rate on uplift capacity of the foundation. The soil profile was characterized using one-dimensional consolidation tests, as well as small-scale vane shear, T-bar penetration, and ball penetration tests. Three test configurations were carried out: pullout extraction tests, foundation compression bearing capacity, and a combination between the two previous types. Stress–displacement and pore pressure–displacement curves for pull-out extraction tests were similar in shape but inversely proportional, which shows that suction contributes to sustaining the bond created between the soil and the mudmat foundation. Suction development was directly proportional to the test rate. These findings demonstrate that decommissioning processes must have adequate controls and avoid high-speed extractions rates. The outcomes of foundation compression bearing capacity tests indicated increases in stress and pore pressure corresponding to increases in loading rate. Foundation pull-out extraction after compression tests attained normalized displacement at the peak stress failure higher that the other test types.

一旦生产活动结束，安装在海底的石油和天然气勘探基础设施必须退役。本研究旨在通过进行小尺度模型试验来评估海底浅基础结构（泥地）的性能。研究了基础孔水压力的变化规律，确定了破坏机制，并评估了加载速率对基础上拔能力的影响。采用一维固结试验、小型叶片剪切试验、t形杆贯入试验和球贯入试验对土体剖面进行了表征。进行了三种试验配置：拉拔试验、地基抗压承载力试验以及两种试验组合试验。抽拔试验的应力-位移曲线和孔隙压力-位移曲线形状相似，但成反比，说明吸力有助于维持土与泥层基础之间形成的黏结。吸力的发展与试验速率成正比。这些发现表明，退役过程必须有足够的控制，并避免高速开采。地基压缩承载力试验结果表明，随着加载速率的增加，应力和孔隙压力也相应增加。压缩试验后拔基抽提在峰值应力破坏下得到的归一化位移高于其他试验类型。

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引用次数: 0

Fatigue damage summation with bias correction 带偏置校正的疲劳损伤求和

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-09-01 DOI: 10.1016/j.marstruc.2025.103926

Nils Sødahl , Sindre O. Skrede , Guttorm Grytøyr , Kathrine Gregersen

This paper presents a framework for establishing bias factors for combining fatigue damage from two independent stochastic processes considering linear SN-curves. The proposed design approach for calculating fatigue damage consists of identifying appropriate bias factor from bias factor contours pre-generated by simulations, and correcting the linear sum fatigue estimate to account for stress amplification. Depending on input parameters, the approach can account for Gaussian, non-Gaussian, wide-banded and narrow-banded processes in a practical way, which is not achieved by existing methods. For long-term fatigue assessments, simplified approaches are possible by selecting a conservative representative bias factor at global minimum, while more accurate estimates can be found by more careful selection of bias factor per short-term condition. Case-specific design contours tailored to the application can be generated using the methodology described. In this paper examples of design contours for combination of wave induced- and vortex induced vibrations (VIV) fatigue relevant for marine risers are presented.

本文提出了考虑线性sn曲线的两个独立随机过程组合疲劳损伤的偏差因子的建立框架。提出的疲劳损伤计算方法包括从模拟预生成的偏置因子轮廓中识别适当的偏置因子，并修正线性和疲劳估计以考虑应力放大。根据输入参数的不同，该方法可以实际地解释高斯、非高斯、宽带状和窄带状过程，这是现有方法无法实现的。对于长期疲劳评估，可以通过在全局最小值上选择保守的代表性偏差因子来简化方法，而通过更仔细地选择每个短期条件的偏差因子可以找到更准确的估计。可以使用所描述的方法生成针对应用程序定制的特定案例设计轮廓。本文给出了与船舶隔水管相关的波浪和涡激振动（VIV）疲劳组合的设计轮廓的实例。

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引用次数: 0

Digital twin-driven structure safety monitoring method for revolving floating cranes based on multi-fidelity surrogate models 基于多保真度代理模型的旋转式浮式起重机双驱动结构安全监测方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-30 DOI: 10.1016/j.marstruc.2025.103925

Xiaobang Wang , Hao Wang , Shuo Wang , Jialin Jiang , Bing Liang , Zhijie Liu

The Revolving Floating Crane (RFC) plays a crucial role in offshore lifting operations, making its operational safety a top priority. However, large lifting loads and harsh conditions during manual operations can cause unstable postures or structural failures, potentially leading to serious economic losses and personal injuries. To address these safety concerns, comprehensive monitoring of RFC operations is essential. Thus, this study proposes a digital twin (DT)-driven structure safety monitoring method based on multi-fidelity surrogate model (MFSM). In the implementation, the structural and functional characteristics of actual RFCs are referenced to build an RFC physical entity. By identifying key operational safety indicators, a sensor-based data acquisition module for RFC entity is developed. Relying on the entity, finite element simulations and actual experiments are then conducted to generate multi-fidelity training data of RFC operational safety, which are used to establish corresponding MFSMs. By Unity3D engine, a virtual interaction platform for data fusion is created for safety monitoring, enabling real-time synchronization from the RFC physical entity to DT model. Finally, physical safety monitoring experiments are conducted on RFC lifting operations. Experiment results demonstrate that the proposed method delivers high real-time performance and accuracy, effectively meeting the engineering requirements for RFC lifting safety monitoring.

旋转浮式起重机（RFC）在海上起重作业中起着至关重要的作用，其运行安全性是重中之重。然而，在人工操作过程中，大的起重载荷和恶劣的条件下，可能导致姿势不稳定或结构失效，可能导致严重的经济损失和人身伤害。为了解决这些安全问题，对RFC操作进行全面监控至关重要。因此，本研究提出一种基于多保真度代理模型（MFSM）的数字孪生驱动结构安全监测方法。在实现过程中，参考实际RFC的结构和功能特点，构建RFC物理实体。在确定关键运行安全指标的基础上，开发了基于传感器的RFC实体数据采集模块。以实体为依托，进行有限元仿真和实际实验，生成RFC运行安全的多保真度训练数据，用于建立相应的mfsm。通过Unity3D引擎创建安全监测数据融合虚拟交互平台，实现RFC物理实体到DT模型的实时同步。最后，对RFC吊装作业进行了物理安全监测实验。实验结果表明，该方法具有较高的实时性和准确性，能有效满足RFC起重安全监控的工程要求。

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引用次数: 0

Optimizing mooring tethers to minimize wave-induced structural responses in submerged floating tunnels 优化锚链以减少水下浮式隧道中波浪引起的结构响应

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-22 DOI: 10.1016/j.marstruc.2025.103923

Kiwon Jeong , Chungkuk Jin , Yunhak Noh , Joonseob Kim , Jongyoon Moon , Seungjun Kim

This study investigates optimal mooring tether designs for submerged floating tunnels (SFTs) to mitigate dynamic structural responses under wave loading. Four configurations were assessed through hydrodynamics-based numerical simulations in ABAQUS-AQUA, enabling direct comparison of motion control performance. The doubly-inclined tether system exhibited the highest efficiency, and its motion control mechanism was experimentally validated. Based on these findings, an integrated mooring design process incorporating multiple criteria is proposed. Recognizing the difficulty of determining optimal design parameters solely through numerical simulations, a simplified analytical method is introduced as an efficient alternative and validated against simulation results. By applying this method, an optimal doubly-inclined tether configuration was obtained, with an outside tether inclination angle of 27.7°, determined considering maximum and minimum tether stresses, and a spacing of 58 m between tethers, governed by fatigue. As these parameters vary with environmental conditions, their final determination should follow the proposed design process for practical implementation.

本文研究了水下浮动隧道系泊索的优化设计，以减轻波浪荷载作用下结构的动力响应。通过ABAQUS-AQUA中基于流体动力学的数值模拟，对四种配置进行了评估，从而可以直接比较运动控制性能。双斜系绳系统效率最高，其运动控制机理得到了实验验证。基于这些发现，提出了一个包含多个标准的综合系泊设计过程。认识到仅通过数值模拟确定最优设计参数的困难，介绍了一种简化的解析方法，作为一种有效的替代方法，并通过仿真结果进行了验证。应用该方法，得到了双斜系绳的最优配置，在考虑最大和最小系绳应力、系绳间距为58 m、疲劳条件下，系绳外倾角为27.7°。由于这些参数随环境条件的变化而变化，因此它们的最终确定应遵循实际实施中建议的设计过程。

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引用次数: 0

Mechanical characterization of bend-twist coupling behavior in composite marine hydro-kinetic turbine blades 船用复合水动力涡轮叶片弯扭耦合性能的力学表征

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-20 DOI: 10.1016/j.marstruc.2025.103924

Miguel A. González-Montijo , Katherine Van Ness , Zack Tully , Richard Wiebe , Brian Polagye , Michael R. Motley

Bend-twist coupling is a phenomenon in some structures whereby bending moments produce not only transverse deflection, but also twist. Recent decades have seen a growing trend toward exploiting this mechanism to advance the performance of structures. This coupling effect can be caused by geometric factors such as eccentric loading, or it can be induced by leveraging the anisotropic nature of fiber-matrix composites. This study focuses on the purposeful use of unbalanced layups in laminated fiber-reinforced polymer spars to tailor bend-twist coupling behavior.

An especially promising application of bend-twist coupled composite structures is their potential use in marine energy turbines. Recent efforts have shown that bend-twist coupling can be used to reduce loading on turbine blades in overload conditions, thereby improving their robustness, without significantly reducing power generation under normal operating conditions. This work robustly characterizes, using both experimental and numerical methods, the relationship between the effective fiber angle (a design parameter) and the: (i) degree of bend-twist coupling, (ii) bending stiffness, and (iii) natural frequencies (system properties) of laminated composite blades. The outcomes of this work will help designers choose the optimal fiber angles for specific applications and will serve as a strong benchmark for the validation of computational models.

弯扭耦合是某些结构中的一种现象，其中弯矩不仅产生横向挠度，而且产生扭转。近几十年来，人们越来越倾向于利用这种机制来提高结构的性能。这种耦合效应可能是由偏心载荷等几何因素引起的，也可能是利用纤维基复合材料的各向异性引起的。本研究的重点是在层压纤维增强聚合物梁中有目的地使用不平衡层来定制弯曲-扭转耦合行为。弯扭耦合复合结构的一个特别有前途的应用是它们在海洋能源涡轮机中的潜在应用。最近的研究表明，弯扭耦合可以用来减少涡轮叶片在过载条件下的负荷，从而提高其稳健性，而不会显著减少正常工作条件下的发电量。这项工作通过实验和数值方法强有力地描述了有效纤维角（一个设计参数）与层压复合材料叶片的弯扭耦合程度、弯曲刚度和固有频率（系统特性）之间的关系。这项工作的结果将有助于设计人员为特定应用选择最佳的纤维角度，并将作为验证计算模型的有力基准。

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引用次数: 0

Statistical analysis of ice load occurrence in floe ice fields 流冰原冰荷载发生的统计分析

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-18 DOI: 10.1016/j.marstruc.2025.103921

Chenxi Xie , Lijuan Xia , Longhui Xiao , Pentti Kujala , Fang Li

Ships navigating in the Arctic and Antarctic regions frequently encounter the threat of ice. Floe ice exhibits various shapes and sizes, with significant variations in thickness and concentration across different ice fields. Estimating the number of ice loads accurately is crucial for strategic navigation and fatigue damage assessment. This paper focuses on the ice load occurrence in floe ice fields which can be determined by the time intervals between contacts. Previous study has shown that the occurrence in level ice fields follows a Poisson distribution and the time intervals follow an exponential distribution. Based on the measurement data on Polar oly and Research Vessel (PSRV) S.A. Agulhas II during 2018/19 Antarctic voyage which encountered extensive floe ice, this paper examines the applicability of previously proposed patterns in level ice fields to floe ice fields. A mixture of exponential distributions is proposed to fit the time intervals in floe ice fields and the statistical test is adopted to evaluate the goodness of fit. The relationships between the parameters of ice conditions and distribution models are discussed. Monte Carlo method and theoretical method are adopted to obtain the ice load occurrence based on the distribution of time intervals. To assess the uncertainty associated with the estimated parameters and the ice load occurrence, Bayesian approach and Bootstrapping are adopted. To further investigate the influence of ice load occurrence on short-term extreme distributions of local ice loads, three methods are employed and the distributions are found to be highly consistent.

在北极和南极地区航行的船只经常会遇到冰的威胁。浮冰的形状和大小各不相同，在不同的冰原上，浮冰的厚度和浓度也有很大的变化。准确估计冰荷载的数量对战略导航和疲劳损伤评估至关重要。本文主要研究了浮冰场中冰荷载的发生，这种冰荷载可以通过接触的时间间隔来确定。以往的研究表明，水平冰原的发生服从泊松分布，时间间隔服从指数分布。基于2018/19年南极航行中遇到大面积浮冰的“阿古拉斯二号”极地考察船（PSRV）的测量数据，研究了先前提出的水平冰原模式对浮冰的适用性。提出了一种混合指数分布来拟合浮冰场的时间区间，并采用统计检验来评价拟合优度。讨论了冰况参数与分布模式之间的关系。采用蒙特卡罗方法和理论方法，根据时间间隔的分布得到冰荷载的发生情况。采用贝叶斯方法和Bootstrapping方法对预估参数和冰荷载的不确定性进行评估。为了进一步研究冰荷载的发生对局部冰荷载短期极值分布的影响，我们采用了三种方法，发现它们的分布高度一致。

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引用次数: 0

Influences of interface bonding behavior on the arresting performance of CFRP buckle arrestors - Part II: Analysis 界面结合行为对CFRP扣式避雷器拦阻性能的影响。第二部分：分析

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-11 DOI: 10.1016/j.marstruc.2025.103922

Xipeng Wang , Zhi Ding , Lin Yuan , Yingying Wang , Shunfeng Gong

The CFRP buckle arrestor, designed as an innovative arresting device, effectively enhances the local circumferential stiffness of subsea pipes, serving as a barrier to prevent the spread of buckling. This arrestor consists of multiple layers of adhesive and CFRP, carefully wound around the subsea pipes in several loops. In the present work, a fully-coupled nonlinear finite element (FE) model is proposed to simulate the collapse and its evolution of tubes wrapped with CFRP arrestors, which is verified by the previous experimental results. The interface bonding performance between tubes and CFRP arrestors is characterized by the surface-based cohesive behavior in ABAQUS, and the circumferential, axial, and normal bonding behavior is defined according to the measured bonding strength and slip. The failure mechanism at the interface between the tubes and CFRP arrestors is revealed. Subsequently, broad parametric analyses are numerically performed, covering key geometric and material parameters as well as interface bonding properties. Finally, based on the extensive FE results, optimized empirical formulas are established to assess the crossover pressure and arresting efficiency of CFRP buckle arrestors under flattening-mode.

CFRP扣式拦阻器是一种创新的拦阻装置，可有效提高海底管道的局部周向刚度，起到防止屈曲扩散的屏障作用。这种避雷器由多层粘合剂和CFRP组成，小心地缠绕在海底管道上。本文提出了一种全耦合非线性有限元模型来模拟CFRP阻雷器包裹管的坍塌及其演变过程，并与前人的实验结果进行了验证。在ABAQUS中，CFRP减震器与钢管之间的界面粘接表现为基于表面的粘接行为，并根据测量的粘接强度和滑移定义了周向、轴向和法向粘接行为。揭示了钢管与CFRP避雷器界面处的破坏机理。随后，进行了广泛的数值参数分析，包括关键的几何和材料参数以及界面粘合性能。最后，在大量有限元结果的基础上，建立了优化的经验公式，以评估CFRP扣式避雷器在扁平模式下的交叉压力和拦阻效率。

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引用次数: 0

Theoretical study of rectangular foam core sandwich plate under low velocity ice wedge impact 低速冰楔冲击下矩形泡沫芯夹芯板的理论研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-06 DOI: 10.1016/j.marstruc.2025.103920

Wen Xiao , Yong Hu , Yinggang Li

In this study, a theoretical model is developed to investigate the impact response of rectangular foam-core sandwich plates subjected to low velocity ice wedge impacts. By employing the pressure-area (P-A) relationship of ice wedge and the yield criterion for foam-core sandwich cross-sections, the ice fragmentation energy dissipation and structural plastic deformation energy dissipation are respectively solved. Based on the shared-energy dissipation mechanism and iterative solution of ice impact response, the plastic deformation and energy dissipation characteristics of rectangular foam core sandwich plates under low velocity ice wedge impact are derived. The analytical predictions are compared with the numerical and experimental results to verify the accuracy of theoretical model. Besides, the effects of impact positions and ice wedge thickness as well as aspect ratio on dynamic response of rectangular foam core sandwich plate under low velocity ice wedge impact are studied. Results demonstrate that the analytical predictions for plastic deformation and ice fragmentation energy agree well with numerical and experimental results. This work provides an important guidance for the structural design and safety analysis of rectangular foam core sandwich plate under ice impact.

本文建立了矩形泡沫芯夹层板在低速冰楔冲击下的冲击响应理论模型。利用冰楔的压力-面积（P-A）关系和泡沫芯夹层截面的屈服准则，分别求解了冰破碎耗能和结构塑性变形耗能。基于冰冲击响应的共享能量耗散机制和迭代解，推导了矩形泡沫芯夹层板在冰楔低速冲击下的塑性变形和能量耗散特性。将解析预测结果与数值和实验结果进行了比较，验证了理论模型的准确性。此外，还研究了冲击位置、冰楔厚度以及长径比对低速冰楔冲击下矩形泡沫芯夹层板动力响应的影响。结果表明，塑性变形和破冰能的解析预测与数值和实验结果吻合较好。为矩形泡沫芯夹芯板在冰冲击下的结构设计和安全性分析提供了重要的指导。

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引用次数: 0

Numerical study of wave forces on truncated cylinder arrays generated by focused waves 聚焦波对截短圆柱阵列波浪力的数值研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-05 DOI: 10.1016/j.marstruc.2025.103907

Qinghe Fang , Hui Wang , Hanchen Zhang , Chunhui Liu , Yongfu Wu , Zaixian Chen , Anxin Guo

Vertical cylinders are commonly used as foundation supports in offshore engineering. Wave forces on a single cylinder have been widely studied and developed into methods for calculating wave loads. However, wave forces on truncated cylinder arrays, representing floating foundations, have been rarely investigated. In this study, the wave forces on truncated cylinder arrays in 2 × 2 and 4 × 4 configurations generated by focused waves were numerically studied. The numerical model was established with the volume of fluid (VOF) method and the k-ω SST turbulence model based on OpenFOAM. The model accuracy was validated against experimental data from literature. The array effect was discussed by comparing the characteristics of wave forces on truncated cylinders at different positions. It was found that there is a nonlinear relationship between wave forces on cylinder arrays and wave amplitude. The wave force distributions of cylinder arrays show strong symmetry relative to wave incidence, with minimal amplitude variations across columns, while enlarged arrays amplify phase modulation. Surrounding cylinders provide significant sheltering effects to inner cylinders. Besides, the spectra of wave force on truncated cylinders were modulated by the spectral characteristics of incident focused waves. An empirical prediction method based on peak wave frequency was proposed to estimate dimensionless wave forces and their spatial distribution within cylinder arrays. This study enhances the understanding of wave force distributions on cylinder arrays under extreme wave and provides valuable insights into structural design of offshore structures.

垂直圆柱体是海洋工程中常用的基础支撑形式。波浪力在单个圆柱体上的作用得到了广泛的研究，并发展成为计算波浪荷载的方法。然而，对代表浮动基础的截短圆柱阵列的波浪力很少进行研究。本文研究了聚焦波对2 × 2和4 × 4两种构型截短圆柱阵列产生的波浪力。采用流体体积法（VOF）和基于OpenFOAM的k-ω SST湍流模型建立了数值模型。通过文献中的实验数据验证了模型的准确性。通过比较不同位置截圆柱上波浪力的特性，讨论了阵列效应。结果表明，圆柱阵列波浪力与波浪幅值之间存在非线性关系。圆柱阵列的波力分布相对于入射波表现出很强的对称性，柱间振幅变化最小，而放大后的阵列放大了相位调制。外筒对内筒具有显著的遮蔽作用。此外，截断柱体上的波浪力谱受到入射聚焦波谱特征的调制。提出了一种基于波浪峰值频率的经验预测方法，用于估计柱体阵列内无量纲波浪力及其空间分布。该研究增强了对极端波浪作用下圆柱阵列波浪力分布的认识，为海上结构设计提供了有价值的见解。

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引用次数: 0