Marine Structures最新文献_第2页

Elastic mode expansion in smoothed particle hydrodynamics framework for hydroelasticity and validation with 3D hydroelastic wedge impact experiments 平滑粒子流体力学框架中的水弹性弹性模式扩展以及三维水弹性楔形冲击实验的验证

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-14 DOI: 10.1016/j.marstruc.2024.103721

Chaitanya Kesanapalli, HeonYong Kang

To perform an efficient hydroelastic simulation with violent free surface interactions, we extend δ+ SPH to elastic modes of a floating structure through GPU parallelization, which includes the correction of velocity divergence with the deformation and computation of the structure's strain. Free surface interaction is supplemented with a segmented particle shifting and tensile instability correction. We validate the developed hydroelastic simulation for experiments of elastic wedge impacts with aluminum and composite panels. Through comparative analysis with different deadrise angles and impact velocities, we find that the improved free surface interactions reduce early separation from the deforming panels, leading to better prediction of the wedge acceleration and reasonably well-matched profiles of the free surface and panel deformation. The marginal difference is attributable to the water passing through the gaps of the physical test model built in three dimensions, which is absent in the simulation setup. Comparing strain time series, measured at two locations on the elastic panels, through three sets of simulations in different dimensions of the simulation set-up and mode shapes, we see that three-dimensional simulation with correct mode shapes in three dimensions accurately predicts the strain time series at both locations as well as the wedge acceleration. The hydroelastic simulation through the modal expansion in GPU parallelization can be utilized to efficiently predict various hydroelastic phenomena with violent free surface interactions.

为了执行具有剧烈自由表面相互作用的高效流体弹性模拟，我们通过 GPU 并行化将 δ+ SPH 扩展到浮动结构的弹性模式，其中包括随变形和结构应变计算的速度发散修正。自由表面相互作用辅以分段粒子移动和拉伸不稳定性校正。我们在铝板和复合板的弹性楔形冲击实验中验证了所开发的流体弹性模拟。通过对不同倾角和撞击速度的对比分析，我们发现改进后的自由表面相互作用减少了与变形面板的早期分离，从而更好地预测了楔形加速度，并合理地匹配了自由表面和面板变形的轮廓。边际差异可归因于水通过三维物理测试模型的缝隙，而模拟设置中不存在这种情况。通过三组不同维度模拟设置和模态形状的模拟，比较在弹性面板两个位置测量到的应变时间序列，我们发现三维模拟和正确的三维模态形状可以准确预测两个位置的应变时间序列以及楔形加速度。通过 GPU 并行化中的模态扩展进行的水弹性模拟可用于有效预测各种具有剧烈自由表面相互作用的水弹性现象。

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引用次数: 0

Extreme nonlinear ship response estimations by active learning reliability method and dimensionality reduction for ocean wave 用主动学习可靠性方法和降维法估算海洋波浪的极端非线性船舶响应

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-12 DOI: 10.1016/j.marstruc.2024.103723

Tomoki Takami , Masaru Kitahara , Jørgen Juncher Jensen , Sadaoki Matsui

An efficient extreme ship response prediction approach in a given short-term sea state is devised in the paper. The present approach employs an active learning reliability method, named as the active learning Kriging + Markov Chain Monte Carlo (AK-MCMC), to predict the exceedance probability of extreme ship response. Apart from that, the Karhunen-Loève (KL) expansion of stochastic ocean wave is adopted to reduce the number of stochastic variables and to expedite the AK-MCMC computations. Weakly and strongly nonlinear vertical bending moments (VBMs) in a container ship, where the former only accounts for the nonlinearities in the hydrostatic and Froude-Krylov forces, while the latter also accounts for the nonlinearities in the radiation and diffraction forces together with slamming and hydroelastic effects, are studied to demonstrate the efficiency and accuracy of the present approach. The nonlinear strip theory is used for time domain VBM computations. Validation and comparison against the crude Monte Carlo Simulation (MCS) and the First Order Reliability Method (FORM) are made. The present approach demonstrates superior efficiency and accuracy compared to FORM. Moreover, methods for estimating the Mean-out-crossing rate of VBM based on reliability indices derived from the present approach are proposed and are validated against long-time numerical simulations.

本文设计了一种高效的短期海况下极端船舶响应预测方法。本方法采用了一种主动学习可靠性方法，即主动学习克里金+马尔可夫链蒙特卡洛（AK-MCMC），来预测极端船舶响应的超标概率。此外，还采用了随机海浪的卡尔胡宁-洛夫（KL）扩展，以减少随机变量的数量，加快 AK-MCMC 的计算速度。研究了集装箱船的弱非线性和强非线性垂直弯矩 (VBM)，前者只考虑了流体静力学和 Froude-Krylov 力的非线性，而后者还考虑了辐射力和衍射力的非线性以及撞击和水弹性效应，以证明本方法的效率和准确性。非线性条带理论用于时域 VBM 计算。与粗糙的蒙特卡罗模拟（MCS）和一阶可靠性方法（FORM）进行了验证和比较。与一阶可靠性方法相比，本方法显示出更高的效率和准确性。此外，根据本方法得出的可靠性指数，提出了估算 VBM 平均出叉率的方法，并通过长时间数值模拟进行了验证。

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引用次数: 0

Structural performance at the joint of precast pile-supported pier structure 预制桩支墩结构连接处的结构性能

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-12 DOI: 10.1016/j.marstruc.2024.103722

Sang Kyu Cho , Tae Hoon Koo , Won Chul Cho

Recently, precast construction methods have been increasingly applied to pile-supported pier structures in coastal areas, offering simplified construction processes, shorter construction periods, and minimized environmental pollution. The use of precast members in offshore construction allows for prefabricated assembly, reducing the need for temporary installations and minimizing field casting work. However, pile-supported pier structures in coastal regions are subject to various marine loads, such as wave, berthing, wind forces and live load, along with uplifting forces due to sea-level rise, making it essential to verify the joints—typically the most vulnerable part of precast structures. This study conducts numerical analyses and experimental tests to evaluate the behavior of joints in newly developed precast structures and assess their structural safety. Results indicate that the failure mode of the structure initiates and progresses at the joint where the precast members connect to field-cast sections. Additionally, it was confirmed that failure originates at the weakest point in areas where precast girders, precast pile caps, and piles are interconnected. Nonetheless, the proposed structure demonstrated structural performance that significantly exceeded the design load.

近来，预制施工方法越来越多地应用于沿海地区的桩基支撑码头结构，从而简化了施工流程，缩短了施工周期，并最大限度地减少了环境污染。在海上施工中使用预制构件可以实现预制组装，减少对临时安装的需求，并最大限度地减少现场浇注工作。然而，沿海地区的桩支墩结构会受到各种海洋荷载的影响，如波浪、停泊、风力和活荷载，以及海平面上升导致的上浮力，因此必须对接缝进行验证--接缝通常是预制结构中最脆弱的部分。本研究通过数值分析和实验测试来评估新开发的预制结构中接缝的行为，并评估其结构安全性。结果表明，结构的失效模式始于预制构件与现场浇注部分连接的接缝处，并在该处发展。此外，在预制梁、预制桩帽和桩相互连接的区域，失效源于最薄弱点。尽管如此，拟建结构的结构性能大大超过了设计荷载。

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引用次数: 0

Development and performance study of a multi-degree-of-freedom loading device for real-time hybrid model testing of floating offshore wind turbines 用于浮式海上风力涡轮机实时混合模型试验的多自由度加载装置的开发与性能研究

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-07 DOI: 10.1016/j.marstruc.2024.103717

Jie Fu , Wei Shi , Xu Han , Madjid Karimirad , Tao Wang , Xin Li

To address the challenges encountered in reproducing turbulent wind loads and scaling conflicts between the turbine and platform in traditional model tests for floating offshore wind turbines. This paper proposes a new real-time hybrid model test strategy with a multi-degree-of-freedom loading device. The design theories of the multi-degree-of-freedom loading device are thoroughly presented. Following this, a software-in-the-loop simulation system was constructed in MATLAB to develop simulation validation on the feasibility and load reproduction capability of the multi-degree-of-freedom loading device. This study addresses the challenges of scale conflicts and turbulent wind load reproduction in traditional model tests, providing a reference for the further development of real-time hybrid model testing techniques for floating offshore wind turbine. The results indicate that the thrust force error in the Fx direction is within 2 %, while the torque and bending moment errors in the Mx, My, and Mz directions are within 8 %. Finally, a hardware-in-the-loop testing system was established to conduct performance tests on the static and dynamic load reproduction capabilities of the multi-degree-of-freedom loading device. The dynamic load variation rate of the multi-degree-of-freedom loading device is 45 N/s, ensuring its capability for dynamic force changes at the scaled-down level. The reproducibility of aerodynamic loads on floating offshore wind turbine under steady wind and turbulent wind conditions by the multi-degree-of-freedom loading device is investigated. The maximum error in reproducing steady wind loads using the multi-degree-of-freedom loading device was found to be 3.7 %. In comparison, the maximum error in reproducing the average values of thrust force and torques in different directions under turbulent wind loads was 9.05 %. Within the 0–5 Hz frequency range, the aerodynamic loads in various directions achieved an energy recurrence rate of at least 99.2 %. It has been demonstrated that the thrust force, torque and bending moment of the floating offshore wind turbine can be effectively reproduced by the device, thereby mitigating the impact of scale effects on floating offshore wind turbine model testing.

为了解决浮式海上风力涡轮机在传统模型试验中再现湍流风载荷以及涡轮机与平台之间的比例冲突所遇到的挑战。本文提出了一种采用多自由度加载装置的新型实时混合模型试验策略。本文详细介绍了多自由度加载装置的设计理论。随后，在 MATLAB 中构建了软件在环仿真系统，对多自由度加载装置的可行性和负载再现能力进行了仿真验证。该研究解决了传统模型试验中尺度冲突和湍流风载荷再现的难题，为进一步开发浮式海上风电机组实时混合模型试验技术提供了参考。结果表明，Fx 方向的推力误差在 2% 以内，Mx、My 和 Mz 方向的扭矩和弯矩误差在 8% 以内。最后，建立了硬件在环测试系统，对多自由度加载装置的静态和动态载荷再现能力进行性能测试。多自由度加载装置的动态载荷变化率为 45 N/s，确保了其在按比例缩小水平上的动态力变化能力。研究了多自由度加载装置在平稳风和湍流风条件下对海上浮式风力涡轮机空气动力载荷的再现性。使用多自由度加载装置再现稳定风载荷的最大误差为 3.7%。相比之下，再现湍流风载荷下不同方向推力和扭矩平均值的最大误差为 9.05%。在 0-5 Hz 频率范围内，不同方向的空气动力载荷的能量重现率至少达到 99.2%。实验证明，该装置可以有效地再现浮式海上风力涡轮机的推力、扭矩和弯矩，从而减轻了规模效应对浮式海上风力涡轮机模型试验的影响。

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引用次数: 0

A frequency domain method for fully coupled modelling and dynamic analysis of floating wind turbines 用于浮动风力涡轮机全耦合建模和动态分析的频域方法

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-02 DOI: 10.1016/j.marstruc.2024.103715

Peng Chen , Zhengshun Cheng , Shi Deng , Zhiqiang Hu , Torgeir Moan

In design of Floating Wind Turbines (FWTs), balancing computational efficiency with analytical accuracy is crucial, a challenge often unmet by time-domain methods. This study innovatively develops and verifies an efficient frequency domain method for fully coupled modelling and dynamic analysis of FWTs, termed DARwind-FD. The tower of the FWT is conceptualised as a beam, with the rotor-nacelle assembly (RNA) and the floating platform envisaged as rigid bodies situated at each extremity. The aerodynamic loads are evaluated utilising the Blade Element Momentum (BEM) theory, supplemented with an analytical model accounting for added mass and damping. The hydrodynamic loads are assessed through the Linear Potential Flow theory, taking into account both first and second-order wave forces along with viscous effects. The mooring forces are analysed using a linearised stiffness matrix, derived from a quasi-static catenary methodology. The code-to-code verification of DARwind-FD is based on the OC4 DeepCwind semi-submersible platform with a 5MW wind turbine, aligns well with OpenFAST time-domain results in terms of dynamic responses such as platform motions, mooring tension, tower base bending moment, and nacelle acceleration under various conditions. The outcomes of this research offer robust technical support for the preliminary design and optimisation of FWTs, thereby contributing to the sustainable advancement of offshore wind energy systems.

在浮动风力涡轮机（FWT）的设计中，平衡计算效率与分析精度至关重要，而时域方法往往无法应对这一挑战。本研究创新性地开发并验证了一种高效的频域方法，用于浮动风力涡轮机的完全耦合建模和动态分析，称为 DARwind-FD。FWT 的塔架被设想为梁，转子-机舱组件 (RNA) 和浮动平台被设想为位于两端的刚体。空气动力载荷利用叶片动量（BEM）理论进行评估，并辅以考虑了附加质量和阻尼的分析模型。流体动力载荷通过线性势能流理论进行评估，考虑了一阶和二阶波力以及粘性效应。系泊力采用线性化刚度矩阵进行分析，该矩阵由准静态导管法得出。DARwind-FD 的代码对代码验证基于装有 5MW 风力涡轮机的 OC4 DeepCwind 半潜式平台，在平台运动、系泊张力、塔架基座弯矩和机舱加速度等动态响应方面与 OpenFAST 时域结果非常吻合。这项研究成果为全功率变流器的初步设计和优化提供了强有力的技术支持，从而为海上风能系统的可持续发展做出了贡献。

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引用次数: 0

Numerical simulation of moored ships in level ice considering dynamic behavior of mooring cable 考虑系泊缆绳动态行为的平冰中系泊船舶的数值模拟

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-11-01 DOI: 10.1016/j.marstruc.2024.103716

Jiaming Chen , Li Zhou , Shifeng Ding , Fang Li

This study develops a new numerical method to simulate the interaction between a moored ship and level ice, taking into account the time-domain effective tension of each mooring cable. Previous studies primarily focused on the ice load exerted on the hull, with an emphasis on accurately predicting of the dynamic ice load. However, for moored structures in polar regions, the mooring system often comes into direct contact with the ice rubble formed during icebreaking process, an interaction that has been largely overlooked in existing studies. The interaction between submerged ice rubble and mooring cables significantly affects both the mooring loads and global motion of the ship. The results show that: 1) When accounting for the ice collision force on the mooring cables, both the total ice force and effective tension on key cables match the experimental data; 2) For different mooring cables, the ice collision force either decreases and increases effective tension depending on the collision angle between the cable and ice rubble; 3) The ice load on the mooring cables play a critical role, significantly impacting both the cables and the entire system. The proposed model is reliable and offers an effective, convenient method for predicting the dynamic response of mooring cables under ice collision forces.

本研究开发了一种新的数值方法，用于模拟停泊船只与水平冰面之间的相互作用，同时考虑到每根系泊缆绳的时域有效张力。以往的研究主要关注冰对船体施加的载荷，重点是准确预测动态冰载荷。然而，对于极地地区的系泊结构而言，系泊系统往往会与破冰过程中形成的碎冰直接接触，而现有研究在很大程度上忽略了这种相互作用。水下碎冰与系泊电缆之间的相互作用会对系泊载荷和船舶的整体运动产生重大影响。研究结果表明1) 当考虑到冰对系泊缆绳的碰撞力时，关键缆绳上的总冰力和有效张力都与实验数据相吻合；2) 对于不同的系泊缆绳，冰碰撞力要么减小，要么增大，这取决于缆绳与冰碎石之间的碰撞角度；3) 系泊缆绳上的冰载荷起着关键作用，对缆绳和整个系统都有重大影响。所提出的模型是可靠的，为预测系泊缆索在冰碰撞力作用下的动态响应提供了一种有效、便捷的方法。

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引用次数: 0

Investigation of higher-order springing of a ship in regular waves by experimental analysis and two-way CFD-FEA coupled method 通过实验分析和双向 CFD-FEA 耦合方法研究船舶在规则波浪中的高阶弹簧作用

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-10-31 DOI: 10.1016/j.marstruc.2024.103712

Binyang Xie , Sumit Kumar Pal , Kazuhiro Iijima , Akira Tatsumi , Timoteo Badalotti

In this paper, the higher-order springing phenomenon is addressed for a segmented barge ship model through experimental and numerical measures. An efficient in-house two-way coupled numerical solver between Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) is developed and validated against experimental results. The coupling method is based on a domain-separated approach and necessitates the resolution of individual boundary value problems in distinct domains. To ensure convergence within these individual domains, an implicit numerical scheme is employed and further facilitated exchange of variables for coupling. The current approach emphasizes the overall convergence between two solvers, maintaining a strongly coupled setup to comprehensively address fluid-structure interaction phenomena, including added mass and damping effects. A series of tank tests were conducted first to measure the wave-induced sectional loads and motions, during which the springing responses to very high-order harmonics of wave load were observed. By comparing the numerical prediction with the tank test results for rigid body motion and flexible vertical bending moment (VBM), the proposed numerical method demonstrated agreement with experimental results, affirming its validity and robustness. Finally, the springing response up to 14th order harmonics is discussed and investigated.

本文通过实验和数值测量研究了分段驳船模型的高阶弹跳现象。在计算流体动力学（CFD）和有限元分析（FEA）之间开发了一种高效的内部双向耦合数值求解器，并根据实验结果进行了验证。耦合方法基于域分离法，需要在不同的域中解决单独的边界值问题。为确保这些单独域内的收敛性，采用了隐式数值方案，并进一步促进了耦合变量的交换。目前的方法强调两个求解器之间的整体收敛性，保持强耦合设置，以全面解决流固耦合现象，包括附加质量和阻尼效应。首先进行了一系列水箱试验，以测量波浪引起的断面载荷和运动，期间观察了波浪载荷的高阶谐波的弹跳响应。通过将刚体运动和柔性垂直弯矩（VBM）的数值预测与水箱试验结果进行比较，发现所提出的数值方法与试验结果一致，从而肯定了其有效性和稳健性。最后，讨论并研究了高达 14 次谐波的弹簧响应。

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引用次数: 0

Structural response and damage assessment method for subsea pipe-in-pipe subjected to anchor impact 海底管中管受到锚撞击时的结构响应和损伤评估方法

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-10-24 DOI: 10.1016/j.marstruc.2024.103714

Fuheng Hou, Yanfei Chen, Yufeng Yan, Ruihao Liu, Rui li, Yu Liu, Rongfeng Zhong

The pipe-in-pipe system is widely used in the development and transportation of offshore oil and gas resources. The damage caused by anchor impacts on the pipe-in-pipe system has long been a focal point and challenge in both engineering and academic fields. Numerical simulation method is employed to investigate the impact process of anchors on pipe-in-pipe systems, revealing the variation patterns of pipeline deformation response over time. The structural response of the pipe-in-pipe system to dropped anchor impacts is studied from multiple perspectives, including deformation, energy, and load transfer. The influence of pipe-in-pipe characteristic parameters, anchor characteristic parameters, centralizers, and bulkheads on the extent of impact damage is analyzed, establishing a relationship between the absorbed energy and the damage to the pipe-in-pipe. The results indicate that the impact energy primarily depends on the mass and velocity of the anchor. Energy is conserved during the impact process. It is found that even with different anchor masses and velocities, the extent of damage to the pipe-in-pipe system remains the same if the impact energy is identical. High-strength steel, large diameter, and thick-walled pipelines exhibit better resistance to impact loads. Additionally, centralizers and bulkheads mitigate the impact damage to the pipe-in-pipe system. Finally, an evaluation method for pipe-in-pipe impact damage due to dropped anchors is proposed. It is discovered that the assessment method for pipelines impacted by dropped anchors in the DNV-RP-F107 standard tends to be conservative when the impact energy is high. The findings of this study provide technical support for the integrity management of pipe-in-pipe systems.

管中管系统广泛应用于海洋油气资源的开发和运输。长期以来，锚杆撞击对管中管系统造成的破坏一直是工程和学术领域的焦点和难点。本文采用数值模拟方法研究了锚具对管中管系统的冲击过程，揭示了管道变形响应随时间的变化规律。从变形、能量和载荷传递等多个角度研究了管中管系统在抛锚冲击下的结构响应。分析了管中管特性参数、锚杆特性参数、集中器和隔板对冲击破坏程度的影响，建立了吸收的能量与管中管破坏之间的关系。结果表明，冲击能量主要取决于锚的质量和速度。在冲击过程中，能量是守恒的。研究发现，即使锚栓的质量和速度不同，如果冲击能量相同，管中管系统的损坏程度也是相同的。高强度钢、大直径和厚壁管道能更好地抵抗冲击荷载。此外，集中器和隔板可减轻管中管系统受到的冲击破坏。最后，还提出了一种因锚栓掉落而造成管中管撞击损坏的评估方法。研究发现，当冲击能量较高时，DNV-RP-F107 标准中针对管道受抛锚影响的评估方法趋于保守。该研究结果为管中管系统的完整性管理提供了技术支持。

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引用次数: 0

Numerical analysis of vortex-induced vibration of deepwater drilling riser based on Van der Pol wake oscillator model 基于范德波尔唤醒振荡器模型的深水钻井隔水管涡流诱导振动数值分析

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-10-23 DOI: 10.1016/j.marstruc.2024.103711

Guangrui Zhang, Yanbin Wang, Deli Gao

Coupled equations of the dynamic model and the Van der Pol wake oscillator model are solved by the central finite difference method for the deepwater drilling riser. The vortex-induced vibration (VIV) response and fatigue life of the riser are calculated and the model validation is performed by comparing with the published experimental and simulation results. The effects of the top tension, current flow velocity, flow velocity profile, internal flow velocity as well as the installation of buoyancy modules on the VIV are discussed. Dynamic response and fatigue life of the riser under In-Line (IL) and Cross-Flow (CF) VIV are preliminarily analyzed. The results show that the VIV of the riser has multiple modes and exhibits a mixed behavior of standing waves and traveling waves. With the increase of top tension and flow velocity profile coefficient, the order of the VIV dominant mode and the peak values of the root mean square (RMS) of VIV displacement decrease, and the fatigue life of the riser is extended. With the increase of current flow velocity, the order of the VIV dominant mode increases and the riser fatigue life decreases. The effect of internal flow velocity on the riser VIV is neglectable. The installation of buoyancy modules can improve the riser stress state and extend the fatigue life. Compared with the CF VIV model, the calculated minimum fatigue life of the riser is extended under the IL and CF coupled VIV model due to the decrease of bending moment and the changing position of fatigue weak point.

采用中心有限差分法求解了深水钻井隔水管动态模型和范德波尔唤醒振荡器模型的耦合方程。计算了立管的涡流诱导振动（VIV）响应和疲劳寿命，并通过与已公布的实验和模拟结果进行对比，对模型进行了验证。讨论了顶部张力、水流速度、流速剖面、内部流速以及浮力模块的安装对 VIV 的影响。初步分析了立管在直列（IL）和横流（CF）VIV 条件下的动态响应和疲劳寿命。结果表明，立管的 VIV 具有多种模式，并表现出驻波和行波的混合行为。随着顶部张力和流速剖面系数的增加，VIV 主导模态的阶数和 VIV 位移均方根（RMS）的峰值降低，立管的疲劳寿命延长。随着流速的增加，VIV 主模的阶数增加，立管的疲劳寿命缩短。内部流速对立管 VIV 的影响可以忽略。安装浮力模块可以改善立管应力状态，延长疲劳寿命。与 CF VIV 模型相比，在 IL 和 CF 耦合 VIV 模型下，由于弯矩的减小和疲劳弱点位置的改变，计算出的立管最小疲劳寿命延长了。

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引用次数: 0

LJF of thin-walled gapped uni-planar K-type tubular steel joints with collar under brace balanced axial loads 带套环的薄壁间隙单平面 K 型管状钢接头在支撑平衡轴向载荷作用下的 LJF

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2024-10-23 DOI: 10.1016/j.marstruc.2024.103713

Hossein Nassiraei , Hamid Reza Chavoshi , Siamak Talatahari

This paper investigates the efficacy of the collar plate in improving the Local Joint Flexibility (LJF) of thin-walled circular hollow section (CHS) K-joints under axial loads. Initially, a finite element model (FEM) was created and verified against data from 14 available experimental tests. Subsequently, an extensive series of 136 unreinforced and reinforced K-joints was simulated to analyze the influence of parameters such as collar plate dimensions (η and λ), brace angle (θ), and joint geometry (β, ξ, and γ) on the LJF factor (f_LJF) and the f_LJF ratio (χ). The FEMs incorporated plate-to-member contact and weld modeling. Findings indicate that the utilization of the plate reduces the f_LJF by 73 %. Additionally, it was observed that plate length significantly affects the f_LJF compared to plate thickness. While the impact of γ, θ, and ξ on χ is marginal, β, η and λ emerge as a noteworthy determinant of χ. Despite the pivotal role of f_LJF in joint behavior, there exists a gap in studies and equations specifically addressing f_LJF in collar-plate reinforced K-joints under axial loads. To address this gap, leveraging the FE results, a design equation is proposed. This equation is subsequently validated with high coefficients of determination and standards set by the UK Department of Energy.

本文研究了领圈板在改善薄壁圆形空心截面（CHS）K 型关节在轴向载荷作用下的局部关节柔韧性（LJF）方面的功效。首先，创建了一个有限元模型（FEM），并根据 14 项可用实验测试的数据进行了验证。随后，对 136 个未加固和加固的 K 型接头进行了大量模拟，以分析领圈板尺寸（η 和 λ）、支撑角（θ）和接头几何形状（β、ξ 和 γ）等参数对 LJF 因子（fLJF）和 fLJF 比率（χ）的影响。有限元模型包括板件接触和焊接建模。研究结果表明，使用钢板可将 fLJF 降低 73%。此外，与钢板厚度相比，钢板长度对 fLJF 的影响更大。γ、θ 和 ξ 对 χ 的影响微乎其微，而 β、η 和 λ 则是 χ 的重要决定因素。尽管 fLJF 在关节行为中起着举足轻重的作用，但专门针对轴向载荷作用下领板式加固 K 型关节中 fLJF 的研究和方程式仍存在空白。为了弥补这一不足，我们利用有限元分析结果提出了一个设计方程。该方程随后通过英国能源部设定的高确定系数和标准进行了验证。

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引用次数: 0