Marine Structures最新文献

Accelerated fully coupled hydro-elastic analysis of ships using a combined full and modal-reduced FEM approach 船舶全耦合水弹性加速分析方法与模态简化有限元方法相结合

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-04 DOI: 10.1016/j.marstruc.2026.104011

Julio García-Espinosa , Antonio José Lorente-López , Borja Serván-Camas , José Enrique Gutierrez-Romero

The numerical simulation of a ship’s hydroelastic structural response is typically carried out using simplified modelling approaches. The main reason can be found in the computational cost of the structural solver when solving the fully coupled hydro-elastic problems. In this work, a two-way coupled fluid-structure interaction model capable of efficiently and accurately computing the hydro-elastic response of a ship using a detailed full-length structural representation is proposed. To reduce the computational cost of the structural solver, a reduced-order method based on modal matrix reduction is applied. The main idea is to largely reduce the number of degrees of freedom of the structural system by retaining only those modes with significant energy. Furthermore, to improve the accuracy of the model, this work proposes a combined methodology in which a residual finite element (FE) solution is computed alongside the reduced model, while still achieving a reduction in the overall computational effort.

The seakeeping hydrodynamics is solved using the computational framework SeaFEM. And the structural particulars are introduced into this framework to fully integrate the fluid-structure interaction.

An application case of the proposed model strategy is presented for a detailed structural design of a ship. The consistency of the modal approximation and methodology is verified against the full FE structural solution. It shows the capabilities of the proposed framework to perform a fully coupled and detailed structural analysis, instead of at component level, with a significant reduction in computational time.

船舶水弹性结构响应的数值模拟通常采用简化的建模方法。其主要原因在于求解全耦合水弹性问题时结构求解器的计算成本。在这项工作中，提出了一种双向耦合流固耦合模型，该模型能够使用详细的全长结构表示高效准确地计算船舶的水弹性响应。为了减少结构求解器的计算量，采用了基于模态矩阵约简的降阶方法。其主要思想是通过只保留那些具有显著能量的模态来大大减少结构系统的自由度。此外，为了提高模型的准确性，本工作提出了一种组合方法，其中剩余有限元（FE）解与简化模型一起计算，同时仍然实现了总体计算工作量的减少。采用计算框架SeaFEM对船体的耐波性进行求解。并将结构特性引入该框架，以充分整合流固耦合。最后给出了该模型策略在某船舶结构详细设计中的应用实例。通过完整的有限元结构解验证了模态近似和方法的一致性。它显示了所提议的框架执行完全耦合和详细的结构分析的能力，而不是在组件级别，大大减少了计算时间。

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引用次数: 0

Effects of variable amplitude loading and random loading sequence on fatigue of welded joints made of high-strength steel in ship structural details 变幅加载和随机加载顺序对船舶结构细部高强钢焊接接头疲劳的影响

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.marstruc.2026.104028

Kiia Grönlund , Antti Ahola , Shahriar Afkhami , Tuomas Skriko

The aim of this study was to validate a local stress-based fatigue assessment approach, the 4R method, for assessing the fatigue strength of common welded ship structural details subjected to variable amplitude (VA) loads. The objective was to provide increased accuracy in fatigue strength estimations through the consideration of local elastic-plastic material behaviour, possible residual stress relaxation, and sequential effects of loading conditions. The VA load effects on fatigue strength of welded joints made of high-strength steel (690QT) were investigated by means of analytical calculations and experimental testing. Random VA load spectra were created for the fatigue tests based on different mean stress levels according to a two-parameter Weibull distribution. Additionally, a 3D scan-based solid finite element model of the longitudinal double-sided gusset joint was employed within the notch-based local fatigue assessments. The use of the scanned geometry reduced the scatter of the fatigue test results among specimens in the local approaches highlighting the importance of accurate consideration of real weld geometry in the determination of fatigue notch factors. Furthermore, the 4R method provided additional accuracy by considering the loading sequence and mean stress via mean-stress correction.

本研究的目的是验证一种基于局部应力的疲劳评估方法，即4R方法，用于评估通用焊接船舶结构细节在变幅（VA）载荷下的疲劳强度。目的是通过考虑局部弹塑性材料行为、可能的残余应力松弛和加载条件的顺序影响，提高疲劳强度估计的准确性。采用分析计算和试验试验相结合的方法，研究了VA载荷对高强度钢（690QT）焊接接头疲劳强度的影响。根据双参数威布尔分布，建立了基于不同平均应力水平的随机VA载荷谱。此外，在基于缺口的局部疲劳评估中，采用了基于三维扫描的纵向双面扣板关节实体有限元模型。扫描几何图形的使用减少了局部方法中疲劳试验结果在试样之间的分散，突出了在确定疲劳缺口因素时准确考虑实际焊缝几何图形的重要性。此外，通过平均应力校正，4R方法考虑了加载顺序和平均应力，提供了额外的精度。

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引用次数: 0

Multi-mode response of a flexible catenary cable under oscillating shear flows 振荡剪切流作用下柔性悬链线索的多模态响应

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.marstruc.2026.104038

Shuai Wang , Hongjie Wen , Jingchang Zhang , Yi Zheng , Junjie Zhu

Flexible catenary cables serve as critical components in offshore power transmission systems; however, their long-span configuration renders them highly susceptible to complex vortex-induced vibrations (VIV) when subjected to platform-induced oscillatory flows. This study develops and validates a coupled finite element–finite volume method (FEM–FVM) computational framework to investigate the VIV of a flexible catenary cable exposed to parallel (PA) and perpendicular (PP) nonlinear oscillating shear flows. The cable’s structural dynamics are modeled using an Euler–Bernoulli tensioned beam formulation, while the surrounding unsteady flow is resolved via large-eddy simulation. Model predictions are systematically compared with experimental measurements, demonstrating the framework’s capability to accurately reproduce phase-dependent characteristics of VIV under oscillatory flow conditions. The results reveal that PA flows induce an asymmetric hyperbolic static deflection with a curvature inflection point, whereas PP flows lead to symmetric deformation patterns. Dynamic responses exhibit velocity-gradient-dependent modal transitions, with PP flows preferentially exciting hybrid standing–traveling wave modes through phase-sensitive energy transfer mechanisms. Vortex evolution analysis identifies distinct phase-dependent behaviors, including a classical “2S” shedding mode during forward flow phases, vortex core dissipation at flow stagnation, and vortex reorganization during flow reversal. Three-dimensional vorticity analysis further uncovers spatially heterogeneous flow structures arising from continuous variations in cable curvature and inflow velocity gradient—manifested as quasi-two-dimensional ordered vortex tubes in the upper span and fully turbulent three-dimensional vortical patterns in the lower span. These findings advance the fundamental understanding of VIV mechanisms in long-span flexible structures under nonlinear oscillatory shear flows and offer valuable guidance for the fatigue-resistant design and installation of subsea power transmission systems in complex marine environments.

柔性悬链线电缆是海上电力传输系统的关键部件；然而，当受到平台诱导的振荡流时，它们的大跨度结构使它们极易受到复杂涡激振动（VIV）的影响。本研究开发并验证了一个耦合有限元-有限体积法（FEM-FVM）计算框架，以研究暴露在平行（PA）和垂直（PP）非线性振荡剪切流中的柔性悬链线电缆的涡激振动。采用欧拉-伯努利张拉梁模型对索的结构动力学进行建模，并通过大涡模拟对索周围的非定常流场进行求解。模型预测与实验测量进行了系统的比较，证明了该框架能够准确地再现振荡流动条件下VIV的相位相关特性。结果表明，PA流动导致了具有曲率拐点的非对称双曲型静态变形，而PP流动导致了对称变形模式。动态响应表现出速度梯度相关的模态转变，PP流通过相敏能量传递机制优先激发混合驻行波模式。涡演化分析发现了不同的相位依赖行为，包括前向流动阶段经典的“2S”脱落模式、流动停滞时涡核耗散以及流动逆转时涡重组。三维涡度分析进一步揭示了由缆索曲率和入流速度梯度的连续变化引起的空间非均质流动结构，表现为上跨的准二维有序涡管和下跨的完全湍流三维涡型。这些发现促进了对非线性振荡剪切流作用下大跨度柔性结构的涡激振动机制的基本理解，并为复杂海洋环境下海底电力传输系统的抗疲劳设计和安装提供了有价值的指导。

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引用次数: 0

Wave slamming load inversion investigation of air cushion vehicle skirt airbags based on impulse-space superposition method 基于脉冲空间叠加法的气垫车辆裙边气囊波浪冲击载荷反演研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-13 DOI: 10.1016/j.marstruc.2026.104040

Yuchao Yuan , Shengjie Xu , Junhong Wei , Li Guo , Wenyong Tang

The flexible skirt airbag is the core component of air cushion vehicle, and the external load it bears under wave slamming directly affects the safety and stability of the structure. Due to the non-uniformity of wave slamming load in time and space, accurately inverting the dynamic load has become an important challenge in current research. This paper proposes a multi-region load inversion model based on impulse-space superposition method to address the inversion of spatial non-uniformly wave slamming load. The construction of the load-response relationship and the solution process of dynamic load inversion are explained. The response characteristics under unit load in a single sub-region are analyzed, and a preferred arrangement of monitoring points along the Y-direction is determined for subsequent inversion. The effects of wave slamming load duration, wave slamming load distribution and wave slamming load area on the inversion precision are discussed. As the load distribution becomes more complex and the areas are larger, the inversion error increases. Properly increasing the number of monitoring points can significantly improve inversion accuracy, especially in more complex asymmetric load scenarios. This inversion method is easy to implement and can provide valuable insights for subsequent research on load identification of air cushion vehicle flexible airbags in actual marine environments.

柔性裙边安全气囊是气垫车的核心部件，其在波浪撞击下承受的外载荷直接影响结构的安全性和稳定性。由于冲击波载荷在时间和空间上的非均匀性，准确地反演动载荷已成为当前研究的一个重要挑战。针对空间非均匀冲击载荷的反演问题，提出了一种基于脉冲空间叠加法的多区域载荷反演模型。阐述了荷载-响应关系的建立和动态荷载反演的求解过程。分析了单个子区域单位荷载作用下的响应特征，确定了y方向监测点的优选布置，便于后续反演。讨论了冲击载荷持续时间、冲击载荷分布和冲击载荷面积对反演精度的影响。负载分布越复杂，面积越大，反演误差也越大。适当增加监测点的数量可以显著提高反演精度，特别是在更复杂的非对称负载情况下。该反演方法易于实现，可为后续气垫车辆柔性安全气囊在实际海洋环境下的载荷识别研究提供有价值的见解。

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引用次数: 0

Probabilistic-based collapse failure mechanism analysis and ultimate bearing capacity evaluation for deep-sea pipelines with random combined defects of geometrical imperfections and corrosion 基于概率的深海管道几何缺陷与腐蚀随机组合缺陷坍塌破坏机理分析及极限承载力评价

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.marstruc.2026.104018

Fengyuan Jiang , Zhenkun Liao , Hongchao Lu , Enjin Zhao , Yijie Gong

Combined defects of initial geometrical imperfections and corrosion are critically responsible for collapse failures of deep-sea pipelines under external pressures. Besides, inherent randomness of combined defects (ovality, spatial locations and dimensions of corrosion defects) remarkably affects the failure development, introducing variabilities and non-linerites into structural responses, under which challenges in evaluating the collapse strength p_clc are posed. A stochastic finite element analysis (SFEA) model is developed to investigate the failure mechanisms of pipelines with random combined defects. Various failure behaviours and collapse modes dominated by corrosion defect, ovality and their combinations are identified, causing pronounced diversities in the p_clps. Probabilistic characteristics of p_clps are quantified, and their correlations with the random influential factors and the collapse failure evolutions are discussed, where the competition and transformation mechanisms among failure modes dominated by different factors are revealed. Further, core failure mechanisms are extracted and formalized into physical constraints to develop a physics-informed neural network (PINN) for forecasting the p_clps. The PINN models show reliable performance in the prediction accuracy, uncertainty quantification and transfer learning. Mutual dependencies among model performance, prediction mechanism and structural failure behaviours in different cases are analyzed, exploring the propagation rules of physical information between physical and digital spaces.

初始几何缺陷与腐蚀的组合缺陷是深海管道外压坍塌失效的重要原因。此外，组合缺陷的内在随机性（腐蚀缺陷的椭圆度、空间位置和尺寸）显著影响着破坏的发展，给结构响应带来了可变性和非线性，这给结构的破坏强度评估带来了挑战。为研究含随机组合缺陷管道的失效机理，建立了随机有限元分析模型。发现了以腐蚀缺陷、椭圆度及其组合为主导的多种破坏行为和破坏模式，导致pclps具有明显的多样性。量化了pclps的概率特征，讨论了其与随机影响因素和坍塌破坏演化的关系，揭示了不同因素主导的破坏模式之间的竞争和转化机制。此外，提取岩芯失效机制并将其形式化为物理约束，以开发物理信息神经网络（PINN）来预测pclps。PINN模型在预测精度、不确定性量化和迁移学习方面表现出可靠的性能。分析不同情况下模型性能、预测机制和结构破坏行为之间的相互依赖关系，探索物理信息在物理空间和数字空间之间的传播规律。

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引用次数: 0

A method for validating loads and responses of large floating wind turbines using nacelle-mounted lidar 一种利用安装在机舱内的激光雷达验证大型浮式风力涡轮机载荷和响应的方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-01-30 DOI: 10.1016/j.marstruc.2026.104019

Feng Guo , David Schlipf , Zhen Gao

For large-scale floating wind turbines, load and response validation enables a closed-loop design process, which helps to validate the simulation models and algorithms and provides a basis for improving subsequent designs. For this purpose, the characteristics of the freestream inflow wind are vital. The nacelle lidar system is easy to install, cost-effective, and capable of measuring the freestream wind in front of the rotor of a floating turbine. However, compared to bottom-fixed turbines, measurement errors in nacelle lidar caused by the motion of the floating platform require accurate motion measurements and complex reconstruction algorithms for motion compensation. In this paper, we investigate the potential of using nacelle lidar for load and response validation of floating turbines through numerical simulations. We propose a method for generating turbulent wind fields considering rotor-averaged wind speed estimated by simulated-lidar system as a constraint. This method does not require motion velocity measurements and allows for simplified wind field reconstruction. Based on aero-hydro-servo-elastic integrated simulations, this study demonstrates the potential of a nine-beam nacelle lidar system for load validation, including both sample-averaged statistical properties and one-to-one comparisons.

对于大型浮式风力机，载荷和响应验证实现了闭环设计过程，有助于验证仿真模型和算法，为后续设计的改进提供依据。为此，自由流入流风的特性是至关重要的。机舱激光雷达系统易于安装，成本效益高，并且能够测量浮动涡轮机转子前的自由流风。然而，与底部固定涡轮机相比，浮动平台运动导致的吊舱激光雷达测量误差需要精确的运动测量和复杂的运动补偿重建算法。在本文中，我们通过数值模拟研究了使用机舱激光雷达进行浮式涡轮机负载和响应验证的潜力。提出了一种以模拟激光雷达系统估计的转子平均风速为约束条件的湍流风场生成方法。该方法不需要运动速度测量，并允许简化风场重建。基于气动-液压-伺服-弹性集成仿真，本研究展示了九束机舱激光雷达系统用于负载验证的潜力，包括样本平均统计特性和一对一比较。

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引用次数: 0

An aero-hydro-servo-elastic coupled frequency-domain method for dynamic analysis of floating wind turbines 浮式风力机气动-液压-伺服-弹性耦合频域分析方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.marstruc.2026.104016

Wenxi Shao , Zhengshun Cheng , Wenbin Zhou , Minghao Cui , Peng Chen , Zhen Gao

Compared with time-domain fully coupled methods for dynamic analysis of floating wind turbines, frequency-domain methods offer higher efficiency but rely on proper representation of nonlinear behaviors. Existing frequency-domain methods usually neglect substantial nonlinearities in aerodynamics, control strategies, as well as blade elasticity, which leads to significant discrepancies against time-domain results, particularly in the prediction of low-frequency and 3P responses. Therefore, this study develops an aero-hydro-servo-elastic coupled frequency-domain model, Pywind-FD, which enhances existing frequency-domain methods by accounting for blade and tower elasticity, advanced control dynamics, mooring line dynamics, and linearized floater and tower drag forces. Moreover, to address the nonlinearities of aerodynamics and control dynamics near rated condition, a hybrid time–frequency module is further integrated, in which the thrust spectrum is obtained based on time-domain simulations. Verifications against the time-domain simulations of 5 MW and 15 MW three-column FWTs confirm that the developed frequency-domain method performs well under high-wind conditions, while the hybrid method, by capturing nonlinear excitation forces, delivers reliable low-frequency predictions across all operating conditions. The inclusion of elastic blade dynamics allows accurate calculation of 3P responses. Overall, the proposed method agrees well with time-domain simulations and could serve as a reliable basis for FWT design and optimization.

与时域全耦合的浮式风力机动力分析方法相比，频域方法具有更高的效率，但依赖于对非线性行为的适当表示。现有的频域方法通常忽略了空气动力学、控制策略以及叶片弹性方面的大量非线性，这导致了与时域结果的显著差异，特别是在低频和3P响应的预测中。因此，本研究开发了一种气动-液压-伺服-弹性耦合频域模型Pywind-FD，该模型通过考虑叶片和塔架弹性、高级控制动力学、系泊线动力学以及线性化的浮子和塔架阻力，对现有的频域方法进行了改进。此外，为了解决空气动力学和控制动力学在额定工况下的非线性问题，进一步集成了时频混合模块，在该模块中基于时域仿真得到推力谱。对5mw和15mw三列fwt的时域模拟验证证实，所开发的频域方法在大风条件下表现良好，而混合方法通过捕获非线性激励力，在所有运行条件下提供可靠的低频预测。包含弹性叶片动力学可以精确计算3P响应。总体而言，该方法与时域仿真结果吻合较好，可为FWT的设计和优化提供可靠依据。

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引用次数: 0

Mitigating load responses of high-speed catamarans via ride control systems: An experimental study in irregular waves, part2: Slamming kinematics and energy transfer 通过平顺控制系统减轻高速双体船的负载响应：不规则波浪中的实验研究，第2部分：猛烈撞击运动学和能量传递

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.marstruc.2026.104035

Ehsan Javanmard , Javad A. Mehr , Damien S. Holloway , Michael R. Davis , Jason Ali-Lavroff

This study investigates the influence of a Ride Control System (RCS) with stern-mounted trim tabs and a bow-fitted T-Foil on slam kinematics and energy transfer during slamming, using a 2.5 m scale model of a 112 m Incat Tasmania high-speed catamaran in irregular waves. Towing tank tests were conducted at a forward speed of 2.89 m/s (37 knots at full-scale) in irregular head seas with significant wave heights of 60 mm and 90 mm, corresponding to 2.7 m and 4 m at full-scale, respectively. It was demonstrated that relative bow immersion is the kinematic parameter most strongly correlated with slam severity and is associated with a higher likelihood of severe slamming. In contrast, slam magnitude (quantified as peak integrated centre bow force derived from strain measurements) showed no strong correlation with either the relative bow velocity at the instant of slamming or the maximum pre-slam relative bow velocity. While these velocity factors showed weaker correlation with slam magnitude reduction compared to relative bow immersion, their importance increases when evaluating the effectiveness of control algorithms that similarly reduce relative bow immersion. The nonlinear pitch control algorithm was found to be the most effective in reducing relative bow immersion, reducing it by 17% and 21% in 60 mm and 90 mm wave heights, respectively, compared to the No RCS condition. Strain energy analysis revealed that this control algorithm reduced overall slam-induced strain energy of the model by 96% in 60 mm waves and 68% in 90 mm waves over a 54-second model test period compared to the No RCS mode. Furthermore, this algorithm mitigated the maximum peak strain energy in the centre bow by 70% in 60 mm waves and 47% in 90 mm waves, highlighting its potential to reduce slam-induced loads and improve the structural design of high-speed catamarans operating in challenging sea conditions.

本研究利用一艘112米的Incat Tasmania高速双体船在不规则波浪中的2.5米比例模型，研究了船尾安装饰边片和船头安装t型箔片的平顺控制系统（RCS）对撞击运动学和撞击过程中的能量传递的影响。拖曳舱试验以2.89米/秒（全尺寸时37节）的前进速度在不规则的头海进行，波浪高度分别为60毫米和90毫米，对应全尺寸时分别为2.7米和4米。研究表明，相对弓浸入度是与撞击严重程度相关性最强的运动学参数，并且与发生严重撞击的可能性较高相关。相比之下，撞击强度（通过应变测量得出的峰值综合船首中心力来量化）与撞击瞬间的相对船首速度或撞击前的最大相对船首速度没有很强的相关性。虽然这些速度因素与降低船首相对浸没强度的相关性较弱，但在评估同样降低船首相对浸没强度的控制算法的有效性时，它们的重要性增加了。研究发现，非线性俯仰控制算法在降低船首相对浸没度方面最为有效，与无RCS条件相比，在60 mm和90 mm波高下，相对浸没度分别降低了17%和21%。应变能分析表明，在54秒的模型试验周期内，与No RCS模式相比，该控制算法使模型在60 mm波下的总应变能降低96%，在90 mm波下的总应变能降低68%。此外，该算法在60毫米波浪中降低了70%的最大峰值应变能，在90毫米波浪中降低了47%，突出了其减少撞击引起的载荷和改进高速双体船在挑战性海况下运行的结构设计的潜力。

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引用次数: 0

Optimization of lifespan extension design for complex systems: degradation modeling, maintenance strategies and cost control 复杂系统寿命延长设计的优化：退化建模、维护策略和成本控制

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.marstruc.2026.104017

Xiaoyan Shao , Baoping Cai , Lei Gao , Zhongfei Sui

In complex systems, degradation processes are often intricate, and failures can result in high repair costs. Therefore, extending the system’s lifespan to enhance economic benefits is crucial. To address this challenge, this paper develops a system lifespan extension optimization method based on lifecycle revenue. First, the expectation-maximization algorithm is used to model component performance degradation and estimate the Wiener process degradation parameters based on component degradation data. Next, an overall system performance degradation model is established based on the functional relationships between components and the system, and an initial remaining useful life (RUL) prediction is performed. Subsequently, maintenance models, including no maintenance, partial maintenance, and complete maintenance, along with the corresponding cost and effectiveness models, are developed. The revenue model before and after maintenance is calculated, focusing on system performance. The ant colony optimization is used to optimize the system’s lifespan extension design, determining the optimal maintenance time and strategy. Finally, based on the optimal maintenance strategy, the post-extension system performance degradation model is reconstructed and the system’s RUL is re-predicted. In the case study, the method is validated using a subsea Christmas tree system. The results show that this method effectively extends the lifespan of complex systems, enhances reliability and economic benefits, and provides a theoretical basis and methodological reference for the lifespan extension of other complex systems.

在复杂的系统中，退化过程通常是复杂的，故障会导致高昂的修复成本。因此，延长系统寿命以提高经济效益至关重要。为了解决这一问题，本文提出了一种基于生命周期收益的系统寿命延长优化方法。首先，利用期望最大化算法对部件性能退化进行建模，并根据部件退化数据估计维纳过程退化参数；其次，基于组件与系统之间的功能关系，建立了系统整体性能退化模型，并进行了初始剩余使用寿命（RUL）预测。随后，建立了不维护、部分维护和完全维护的维护模型，以及相应的成本和效果模型。以系统性能为核心，计算维护前后的收益模型。采用蚁群算法对系统的延寿设计进行优化，确定最优维修时间和策略。最后，基于最优维护策略，重构了扩展后系统性能退化模型，并重新预测了系统的RUL。在案例研究中，使用海底采油树系统对该方法进行了验证。结果表明，该方法有效地延长了复杂系统的寿命，提高了可靠性和经济效益，为其他复杂系统的寿命延长提供了理论基础和方法参考。

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引用次数: 0

Field study on installation characteristics of bucket foundation for offshore wind turbine in marine clay 海上风力机桶形基础在海洋粘土中安装特性的现场研究

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2026-03-15 Epub Date: 2025-12-25 DOI: 10.1016/j.marstruc.2025.104002

Sen Li , Kun Fu , Wenbo Tu , Lixiang Wei , Xiaoqiang Gu , Kanmin Shen , Wei Guo , Yaoyu Jia

The installation of the bucket foundation is critical to the long-term service performance of offshore wind turbines. To understand the stress changes of the bucket foundation and the surrounding soil during the installation process, a field test of the installation of the bucket foundation was carried out at the Pinghai Bay offshore wind farm in Fujian, China. The internal pressure of the bucket foundation, the pore water pressure, the soil pressure along the bucket foundation skirt, the structural stress of the bucket foundation and the inclination angle of the bucket foundation were monitored in real-time during the field test. The results show that the attitude of the bucket foundation can be well controlled by using a pumping system during the installation process. The pore water pressure on the external side of the bucket foundation can be used to determine the penetration depth of the foundation, and the cone tip resistance obtained by CPT can be used to approximately determine the penetration resistance of the foundation. In addition, the magnitude of the structural stress of the bucket foundation is directly proportional to the magnitude of the differential pressure. The top plate and skirts of the bucket foundation mainly experience deformation toward the internal part of the foundation under differential penetration pressure, however, the soil stresses along the skirts of the foundation and the stresses of the bucket foundation skirt show an evident flexural deformation of the foundation skirts due to the excessive differential penetration pressure. The results of the study can offer guidance for the installation of bucket foundations in marine clay.

桶形基础的安装对海上风机的长期使用性能至关重要。为了解桶形基础在安装过程中与周围土体的应力变化情况，在福建平海湾海上风电场进行了桶形基础安装现场试验。在现场试验过程中，实时监测桶型基础内部压力、孔隙水压力、桶型基础裙边土压力、桶型基础结构应力和桶型基础倾角。结果表明，在安装过程中采用泵送系统可以很好地控制桶形基础的姿态。桶形基础外侧的孔隙水压力可用于确定基础的侵彻深度，CPT得到的锥尖阻力可用于近似确定基础的侵彻阻力。此外，桶形基础结构应力的大小与压差的大小成正比。差贯压作用下，桶形基础的顶板和裙边主要向基础内部变形，但过大的差贯压作用下，沿基础裙边的土应力和桶形基础裙边的应力表现出明显的基础裙边弯曲变形。研究结果对海相粘土中桶形基础的安装具有一定的指导意义。

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引用次数: 0