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Research on energy harvesting characteristics of a flapping foil with trailing edge jet flap Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-13 Zhizun Lv, Gang Zhang, Xiaojing Sun
Flapping foils offer a potential means for extracting hydrokinetic energy from ocean and river flows by utilizing a combined pitching and heaving motion of the airfoil. In this paper, the effectiveness of trailing edge active flow control in enhancing the energy harvesting performance of the conventional flapping foil is examined through numerical simulations. In this approach, an injections slot is
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Multi-objective shape optimization of underwater vehicles based on an adaptive sampling algorithm Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-13 Shupei Chen, Feng Liu
Shape optimization can effectively enhance the endurance of autonomous streamlined underwater vehicles (SUVs). This paper compares the multi-objective optimization results (volume maximization and resistance minimization) for three distinct SUV styles with appendages. The shape optimization process adopts a stochastic population-based approach called the metamodel-based design optimization (MBDO) method
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Determination of the overconsolidation ratio and undrained shear strength of cohesive soils by CPTu measurement Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-12 Zhan-Liang Wang, Hao-Biao Chen, Fu-Quan Chen, Li-Yang Liu
Estimations of the undrained shear strength () and overconsolition ratio (OCR) of cohesive soil are essential for the evaluation of geology investigation. In comparison to time-consuming laboratory tests, the field piezocone penetration test (CPTu) can rapidly evaluate these parameters. However, existing studies have mainly relied on empirical correlations to estimate the undrained shear strength and
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Structural integrity of glass fiber reinforced nanocomposites under hydrothermal aging for offshore structure applications Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-11 Gokhan Demircan
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Advances in techniques for simulating decadal changes to barrier islands morphology Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-10 Wei-Shiun Lu, Shih-Chun Hsiao, Wen-Son Chiang
We advanced an integrated framework for the analysis of decadal morphological changes in barrier islands. When applied to Taiwan's Waisanding Barrier Island, this refined methodology proved both precise and effective. Utilizing the Coastal Modeling System by the U.S. Army Corps of Engineers for simulations, we sourced representative wave datasets from the European Centre's ERA5. By employing streamlined
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Experimental study on asynchronous parallel high-speed oblique water entry of cylinders Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-06 Yulin Wang, Yingjie Wei, Cong Wang, Yonghao Wen
This study presents the construction of a high-precision, high-speed parallel water entry experimental system and proposes a more accurate optical correction method. An experiment is conducted on parallel high-speed oblique water entry to analyze different time intervals that affect cavity development, interference, and coupling modes. This study found three squeezing modes between the cavities when
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Determination of the drag, lift and added mass coefficients of special unexploded ordnance (UXO) as a function of the Reynolds number and the burial depth Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-06 Daniel Klembt, Peter Menzel, Karsten Breddermann, Henning Wranik, Thomas Miethe
Unexploded ordnance (UXO) and Discarded Military Munitions (DMMs) are found in many coastal regions. These objects are constantly exposed to environmental influences such as saltwater, which causes corrosion, and waves and currents as well as mobile seabed sediments. The basic assumption to decide if an object is mobilised by waves and currents or not is to compute the critical loads that are needed
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Buckling and material failure analyses for ring-stiffened composite shells subjected to hydrostatic pressure Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-06 Xinhu Zhang, Yonghe Liu, Zhiwei Chen, Zhaoqi Yang, Ruixuan Hu, Guang Pan
In this paper, both the buckling and material failure for ring-stiffened composite shells under hydrostatic pressure are studied by theoretical and finite element (FE) methods. Theoretical formulas to predict the critical buckling pressure and material failure load for ring-stiffened composite shells are proposed. To validate the proposed analytical solutions, FE models are built and the buckling and
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Characterisation of flow regimes in the bow wave of a surface piercing cylinder Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-05 Shannon J Keough, Andrew Ooi, Jimmy Philip, Jason P Monty
A series of tow tank experiments are performed to observe the free surface deformation around a surface piercing cylinder with 39mm diameter, at a range of Froude numbers . Particular attention is paid to the bow wave at the front of the cylinder and 6 distinct flow regimes are observed to appear as the velocity of the cylinder is increased, from the appearance of a steady hydraulic jump at the leading
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The control method for ship tracking when navigating through narrow and curved sections Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-04 Jinlai Liu, Liwen Huang, Deqing Yu, Luping Xu, Yixiong He
A track control method is proposed to solve the problem of manual steering difficulties in narrow and curved sections. The performance of a ship heading controller is affected by various factors, such as delay of the ship steering gear, external environmental disturbances, and variations in ship's speed. Firstly, a Smith optimal PID heading controller is designed. Then, a speed control method based
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Application of RGB UAV imagery to sea surface suspended sediment concentration monitoring in coastal construction site Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-04 Hyoseob Noh, Siyoon Kwon, Yong Sung Park, Seung-Buhm Woo
Monitoring the spatial distribution of suspended sediment concentration (SSC) is of paramount importance, particularly in coastal construction sites where elevated SSC levels are inevitable. Remote sensing techniques using unmanned aerial vehicles (UAVs) have proven to be effective in estimating SSC distribution, making use of the optical spectral variations induced by SSC. The SSC-sensitive spectral
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Numerical investigation on the interaction between large-scale continuously stratified internal solitary wave and moving submersible Appl. Ocean Res. (IF 4.3) Pub Date : 2024-03-01 Lu Cheng, Chao Wang, Binbin Guo, Qianyong Liang, Zhongliang Xie, Zhiming Yuan, Xiaopeng Chen, Haibao Hu, Peng Du
Internal solitary waves are a special type of non-linear ocean internal waves. Due to their high peak and deep valley, they can cause motion instability and loss of control of submersibles. This work investigates the interaction between large-scale continuously stratified internal solitary waves and an advancing submersible. Based on the fully nonlinear internal solitary wave theory, i.e. Dubriel-Jacobin-Long
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Gaussian process regression approach for predicting wave attenuation through rigid vegetation Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-27 Kristian Ions, Alma Rahat, Dominic E. Reeve, Harshinie Karunarathna
Numerical modelling in the coastal environment often requires highly skilled users and can be hindered by high computation costs and time requirements. Machine Learning (ML) techniques have the potential to overcome these limitations and complement existing methods. This is an exploratory investigation utilising a Gaussian Process (GP) data-driven modelling approach that can reproduce, for the given
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Impact force of non-Boussinesq gravity-current head against a circular cylinder above the seabed Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-26 Sana Ramezani, Peiwei Xie, Vincent H. Chu
We study the impact force of the gravity-current head on a circular cylinder above the seabed for the non-Boussinesq effect using a large-eddy simulation model well validated against laboratory data. Most existing studies of the gravity current were for the slight density difference between the current and the ambient fluid, assuming the density is constant using the Boussinesq approximation. The aim
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Numerical simulation of heterogeneous ice sheet-structure interaction based on cohesive element method Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-26 Sijia Han, Biye Yang, Borui Yang, Guiyong Zhang
The coupling process between sea ice and offshore structures is complex, which involves the influences of physical and mechanical properties of sea ice, structural dynamics, and fluid–structure interaction. In this work, a numerical model was established to simulate the ice-structure interactions, which is based on the cohesive element method combined with random field. The complicated spatial heterogeneity
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Far-field characteristics and evolutions of electromagnetic field induced by the wake of underwater vehicles Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-20 Bo Huang, Zhongyan Liu, Yujing Xu, Mengchun Pan, Jiafei Hu, Qi Zhang
Under the influence of the geomagnetic environment, charged seawater motion in the submarine wake generates a wake electromagnetic field, which is of great significance for underwater target detection and tracking. The generation of the wake electromagnetic field involves the coupling of multiple physical fields, such as fluid mechanics, ion transport, and electromagnetic fields, which have not yet
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A block failure model for deep-sea sediment between grousers of deep-sea mining vehicles based on elasto-plastic theory Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-20 Xuelin Liu, Xuguang Chen, Ling Wang, Ning Zhang, Fengpeng Zhang
Avoiding in-situ skidding of tracked deep-sea mining vehicles on soft sediment and reducing disturbance to soft sediments are the basic requirements for ensuring the regular operation of seabed mining. The in-situ skidding problem of the tracked deep-sea mining vehicle can be explained by the block shear failure phenomenon of deep-sea soft sediment. We analyzed the force state and elastic-plastic state
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On the maximum velocity profile of wave boundary layer flows in the very rough turbulent regime Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-19 Yunfei Teng, Feifei Tong, Yi Liu, Lusheng Jia, Zhanjie Chen, Zhe Gao, Liang Cheng, Guoqiang Tang, Lin Lu, Chen Li
The maximum velocity profile in turbulent wave boundary layer flows has been experimentally investigated under both regular and irregular wave conditions. Four types of seabed models are adopted, i.e., smooth, sand-covered, uniform-sphere-covered and nonuniform-stone covered. The results show that the maximum overshoot increases with the decreasing / ( is the semi-excursion of fluid particles in the
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Quantitative assessment of building risks and loss ratios caused by storm surge disasters: A case study of Xiamen, China Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-19 Shi Xianwu, Lv Yafei, Dong Dibo, Jia Ning, Ge Jianzhong, Yin Jie
China is severely affected by storm surge disasters, which result in substantial economic losses and casualties in coastal regions. Assessing the risk of storm surge disasters can provide valuable insights into the expected losses and severity of future impacts, offering critical foresight for disaster prevention and mitigation strategies. This study assesses the quantitative risk of storm surge disasters
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STGWN: Enhanced spatiotemporal wave forecasting using multiscale features Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-17 Aming Yue, Wenhua Wu
This paper addresses the challenge of low accuracy in wave height prediction due to inadequate consideration of irregular topological structures and spatio-temporal dependencies of wave measurement points. We propose a novel spatio-temporal wave prediction method, named the Spatio-Temporal Graph Wave Network (STGWN). This model employs graph convolution instead of conventional 2D convolution, enabling
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Heave attenuation in offshore managed pressure drilling with an integral sliding mode controller Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-17 Danial Pazoki, Amirhossein Nikoofard, Ali Khaki Sedigh
Managed pressure drilling (MPD) is a technique used to precisely control the pressure within the wellbore during the drilling process to overcome drilling challenges, such as heave disturbance caused by waves. The mismatched nature of the heave disturbance presents a control challenge, making it difficult to reduce the disturbance effectively. However, MPD utilizing an appropriate controller can provide
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Long-term settlement of suction bucket foundations supporting offshore wind turbines in clay Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-16 Youhu Zhang, Shufeng Zhao, Hongjie Zhou, Knut H. Andersen, Bo Liu
As an alternative to monopiles, suction bucket jacket foundations are gaining increasing popularity in China for supporting offshore wind turbines. One of the major design challenges and governing factors for foundation sizing is the long-term tilt caused by the differential settlement between the buckets due to a combination of prevailing wind directions and soft seabed conditions. The assessment
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Unravelling oceanic wave patterns: A comparative study of machine learning approaches for predicting significant wave height Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-15 Muhammad Abbas, Zhaoyi Min, Zhongying Liu, Duanjin Zhang
The architecture of the ML and DL based Significant Wave Height Prediction System
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Investigation to the nonlinearity evolution of offshore wind turbines using field data: Application to a 4 MW monopile offshore wind turbine Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-15 Shujian Gao, Guoning Feng, Fushun Liu
Offshore wind turbines (OWTs) experience persistent nonlinear vibrations due to constantly changing environmental and operational conditions. These nonlinear dynamic responses significantly affect structural safety and introduce uncertainties in predicting fatigue and service life. However, understanding the complex nonlinear characteristics of OWTs is challenging because multiple factors collectively
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Hydroelasto-plastic Experiment and Numerical Investigation on a Three-Cabin Ship Model in Waves Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-14 Ye Lu, Weiqin Liu, Qilu Zou, Yaqiang Zhang, Haotuo Qu, Xuemin Song
Large waves used to cause a lot of ship collapse accidents, resulting in the loss of many lives and property. The response of ships to collapse, including plasticity and buckling, has aroused focused concern among researchers. This paper carries out a hydroelasto-plastic experiment and numerical investigation of a three-cabin ship model to study its structural collapsed response. Firstly, a hydroelasto-plastic
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Influence of scour and scour protection on the stiffness of monopile foundations in sand Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-12 Jann-Eike Saathoff, Norman Goldau, Martin Achmus, Alexander Schendel, Mario Welzel, Torsten Schlurmann
Offshore structures are subject to cyclic effects from wind and waves, as well as altered seabed. Local and global scour can form around the foundation elements, which in turn can affect the structures’ response in terms of serviceability, eigenfrequency and fatigue limit state. If a scour protection is installed, a stiffening effect is to be expected. The paper investigates the influence of local
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Risk assessment of FPSO swivel stack systems using a multi-source data fusion approach Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-10 Chongchong Guo, Wenhua Wu, Baicheng Lyu
This paper addresses the risk analysis of Floating Production Storage and Offloading (FPSO) swivel stack systems, crucial components of Single Point Mooring (SPM) systems. Traditional risk assessment methods face challenges in data fusion, uncertainty handling, and dynamic prediction. To overcome these limitations, a multi-source data fusion approach is proposed. A field monitoring system for the swivel
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Full-scale experimental study and modelling of pile-beam joint for prefabrication restoration technology of ocean engineering Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-10 Tong Qiu, Xiangsheng Chen, Dong Su, Kunyang Chen, Xiang Shen, Xingtao Lin, Kaihang Han, Jun Shen, Yuansheng Peng
Ocean engineering structures are susceptible to severe damage caused by adverse weather conditions. The question of accelerating post-disaster restoration is the focus for ocean engineering resilience. In this regard, this study proposed the prefabrication restoration technology and investigated the mechanical properties of the key pile-beam joint. Full-scale experiments are conducted to analyze the
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Response analysis and experimental research on control characteristics of pipeline intelligent plugging robot autonomous plugging hydraulic system Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-09 Yang Tang, Yunsen Pi, Yuan Wang, Guorong Wang
To efficiently and accurately complete the plugging task and enable rapid maintenance and repair operations of submarine pipelines by pipeline intelligent plugging robot (PIPR), this study innovatively designs an autonomous plugging hydraulic control system for PIPR. Based on this, the simulation is used to confirm the viability of the control system, and the changes in displacement, flow, speed, and
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Bearing, elevation, and depth difference passive inverted acoustic navigation for an AUV fleet Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-08 Yuki Sekimori, Yukiyasu Noguchi, Takumi Matsuda, Yang Weng, Toshihiro Maki
This article proposes the bearing, elevation, and depth difference (BEDD) passive inverted super short baseline (piSSBL) acoustic navigation method for autonomous underwater vehicles (AUVs). The piSSBL acoustic positioning is scalable regarding the number of receiving vehicles, and the BEDD measurements do not require accurate intervehicle time synchronization. The proposed observer combines acoustic
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Evaluation of aging process of PA11 from offshore flexible pipe pressure barrier Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-08 Guilherme Pereira Mota, Antonio Henrique Monteiro da Fonseca Thome da Silva, Elisson Brum Dutra da Rocha, Ana Lucia Nazareth da Silva
The research presented proposes a new methodology for measuring degradation of polyamide 11 (PA11), as an alternative to the classic criterion established by the American Petroleum Institute in API17TR2. PA11 flexible pipes may be subjected to different degradation conditions, being hydrolysis one of the main aging mechanisms. Aged PA11 pressure barriers coming from flexible pipelines were sliced into
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Operational risk assessment of marine boiler plant for on-board systems safety Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-08 Bulut Ozan Ceylan, Mehmet Serdar Celik
A marine boiler plant is an essential auxiliary onboard machinery that provides pressurized steam to several ship systems such as pipeline steam tracing, fuel tank heating, main engine jacket water heating, separation, cleaning, cargo pump operation, electric generation, etc. Despite the crucial role of this equipment in ship operations, its components, including fuel, air, water, exhaust, and steam
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Wave diffraction and radiation problems on a heteroaxial floating structure composed of two cylinders Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-06 Yikuan He, Bing Han, Longbiao Yan, Xu Han
To expand the application of the analytical method in dealing with the diffraction and radiation problems of the heteroaxial cylinder structure under waves, this paper takes the heteroaxial cylinder structure composed of two cylinders as an example to establish an analytical model. The wave diffraction and radiation problems of the structure were solved, and the wave force, added mass and radiation
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An experimental study on determining the best operating condition of an automated underwater biofouling cleaning tool Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-06 Rafael S. Queiroz, Daniel M. de Souza, Erick C. das Neves, Ivan J.Q. Filho, Lucas C. da Silva, Rodrigo S. Coelho, Herman A. Lepikson
Efficiently removing marine biofouling from ship hulls is essential for maintaining asset integrity. This study explores the application of a rotating brush mounted on an automated system designed for cleaning plates under controlled conditions. Two experiments were conducted: one to evaluate geometric combinations – attack angle and tool standoff – for effective coating removal and another to determine
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Three-spring soil reaction model for wind turbine monopile foundation in clay Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-06 Yuqi Jiao, Dongsheng Qiao, Bin Wang, Guoqiang Tang, Lin Lu, Jinping Ou
Precisely estimating the lateral capacity of the large-diameter monopile is essential for securing the stability of the fixed wind turbine of high power generation. Conventional standards relying on curves often underestimate the monopile-soil interaction due to their failure to account for pile shaft rotations and base effects, leading to overly cautious lateral capacity designs. This paper introduces
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A new tribo-dynamics modeling and online measurement method for crosshead bearings in marine engines Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-06 Rui Li, Xianghui Meng, Guodong Li, Jing He, Yiming Xing, Yun Ke
Due to harsh working conditions, the crosshead bearing is reported to be the bearing with the highest failure rate in marine engines. The dynamics behavior, fluid lubrication, and solid contact are coupled with each other, resulting in great difficulty in predicting the bearing performance. In the current study, a new tribo-dynamics model was proposed by coupling the multi-body dynamics model of the
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Development of an oscillating water column-type wave absorber for anti-reflection and effective energy extraction Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-05 Fang He, Jiapeng Pan, Yuan Lin, Mengxia Song, Siming Zheng
Assorted novel low-reflection structures have been developed for the need of berthing safety in the harbor. The oscillating water column (OWC)-type wave absorbers offer significant benefits as they not only reduce reflected waves but also harness wave energy effectively. Based on the previous studies, a multi-factor comprehensive research on the reflection characteristics, energy extraction performance
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Nonlinear mechanic analysis of a composite pipe conveying solid-liquid two-phase flow Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-03 Yu-Xiang Wang, Ye Tang, Tian-Zhi Yang
Nowadays, resources such as oil and natural gas are the main energy substances that support economic development and social progress. Generally, pipelines are used to transport oil and natural gas resources because of the advantages of good continuity and high efficiency, but this kind of transmission condition may cause more complex mechanical behaviors. In this work, we present the use of fiber reinforced
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Dynamic analysis of a floating dock under accidental conditions Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-02 Xueliang Wen, Alejandro García Conde, Jianan Zhang, Muk Chen Ong
The utilization of floating docks has an inherently higher risk than their ground counterpart and can result in severe accidents due to the possibility of stability loss and structure failure. To minimize the occurrence of accidents, it is essential to conduct comprehensive testing on the dock's behaviours and identify potential points of failure that could lead to severe accidents using an efficient
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Numerical and experimental investigation of vortex formation modes on a freely vibrating circular cylinder at high Reynolds numbers Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-02 Aytekin Duranay
In this article, a series of investigations into the vortex-induced vibrations (VIV) of circular cylinders in the transverse direction is performed. The examinations focus on the Transition of Shear Layer 3 (TrSL3) flow regime, encompassing Reynolds numbers within the range of 3.4 × 10 ≤ ≤ 2.2 × 10, and explores the VIV responses at low mass ratios including one case for the infinite synchronization
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Disturbance rejection control of adaptive integral LOS unmanned ship path following based on fast wave inversion Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-02 Dongdong Mu, Jiasong Li, Guofeng Wang, Yunsheng Fan
This paper studies a refined path following control of unmanned ships based on real-time wave compensation. This technology mainly inverts the wave information of the ship in the current sea state and compensates in the unmanned control system in real time to achieve better control effects. Firstly, the system identification method is used to obtain the wave information in the current sea state in
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Real-time ship detection system for wave glider based on YOLOv5s-lite-CBAM model Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-30 Zhilin Lyu, Chongyang Wang, Xiujun Sun, Ying Zhou, Xingyu Ni, Peiyuan Yu
The on-line ship detection system based on wave glider has good application prospect. However, there are still challenges in model weight, recognition accuracy and real-time performance when the system is applied in the remote ocean environment. Hence, a real-time ship detection system based on YOLOv5s-lite-CBAM model is proposed in this paper. Additionally, a JPEG-PNG image compression algorithm is
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Effects of soft marine growth on vortex-induced vibration: A comparative analysis with hard marine growth Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-01 M.M. Aalami Harandi, V. Tamimi, M. Zeinoddini, M.R. Rashki, H. Ashrafipour
The experimental modeling of vortex-induced vibration (VIV) poses a significant challenge when dealing with marine growth due to its diversity in species, size, and texture. Soft marine growth, in particular, presents a more complex behavior compared to hard marine growth, and its influence on the VIV phenomenon has received less attention. Therefore, the present study experimentally investigates the
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Analysis of aquaculture safety in marine cage culture area of Maniao bay under the effect of typhoon Appl. Ocean Res. (IF 4.3) Pub Date : 2024-02-01 Meiling Zhang, Xuanzhi Wang, Changgen Liu, Jiaming Cui, Yu Tian, Xiaofu Xu
Typhoon is a significant natural disaster in coastal regions, which poses a serious threat to the safety of deep-water cages. By taking Maniao Bay as a representative research area, the method of evaluating the safety of aquaculture cages under the impact of typhoon is introduced in detail in this paper. Based on the coupling Holland wind field model and the Delft3D wave-flow model, the processes of
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An equivalent single plate approach of ship stiffened panels considering coupling effect of compression and bending Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-29 Xiaolei Liu, Muzhi Li, Yuchao Yuan, Wenyong Tang
Due to the increasing complexity and size of ships, fine mesh finite element analysis (FEA) is no longer practical for large ships' early design phases due to its high computational and time costs. This paper presents an equivalent single plate (ESP) approach for ship stiffened panels with full consideration of compression and bending coupling effect. Based on the force equilibrium and compatibility
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Implementation of digital twin-enabled virtually monitored data in inspection planning Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-25 Shen Li, Feargal Brennan
Marine structures are subjected to cyclic wave loads in ocean environments, leading to progressive forms of structural degradation such as fatigue cracks. To ensure fitness-for-service of these critical assets, there has been increasing interest in the application of digital twin-enabled virtual monitoring techniques. Whilst numerous studies have focused on computational algorithms dedicated to virtual
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For better comprehension of mussel's thermal characteristics and their thermal effect on dynamic submarine electrical cables Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-25 Ziad Maksassi, Ahmed Ould EL Moctar, Bertrand Garnier, Franck Schoefs, Emmanuel Schaeffer
Floating offshore wind turbines (FOWTs) face a major challenge when focusing on the effect of biofouling: biofouling by mussels on bottom-surface mobile connections, such as dynamic submarine electrical cables and mooring lines. Mussels are one of the dominant species in offshore wind farms in North Atlantic area. Amongst other effects, mussels can cause significant thermal impacts on dynamic power
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3D SPH analysis of focused waves interacting with a floating structure Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-23 Nicolò Salis, Xiangyu Hu, Min Luo, Alessandro Reali, Sauro Manenti
In recent years, the number of offshore floating structures has been growing and is expected to continue growing. Due to climate change, the frequency and severity of extreme waves are increasing. Numerical models can be a strategic tool in the reliable design and optimization of marine structures. However, the number of numerical parameters to be tuned plays a crucial role, as they could limit the
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Mapping the biofouling activities of aged fouling release coating surfaces undergoing underwater cleaning Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-18 Shujie Lin, Huichao Bi, Claus Erik Weinell, Kim Dam-Johansen
The effectiveness of fouling release coatings (FRCs) may diminish over time in the seawater. Underwater cleaning of FRCs in service is crucial for biofouling control. This study investigated the effects of cleaning parameters (brush moving speed, cleaning force and frequency) on a silicone-based FRC (SiFR) aged for 2 months (A2-SiFR) and 13 months (A13-SiFR), simulating the short-term and long-term
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An artificial neural network model for fatigue damage analysis of wide-band non-Gaussian random processes Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-18 Kuilin Yuan, Shifeng Peng, Zhuocheng Sun
Fatigue damage analysis is essential for ships and offshore structures subjected to various fluctuating loadings. In many realistic scenarios, structural responses that exhibit wide-band non-Gaussian characteristics are common, rendering the frequency-domain methods for fatigue damage analysis inaccurate. The rainflow counting method is widely used in the context of time-domain fatigue damage analysis;
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Investigation of vessel slamming and fatigue using a full-scale test sequence Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-18 Karl-Heinz Pferdekämper, Anriëtte Bekker
Full-scale measurements were recorded during open-water test sequences on a polar class research vessel. Rainflow cycle counting and Miner’s law are used to quantify fatigue response from recorded strain-time series. Both low-frequency wave bending and high-frequency flexural bending are considered. Acceleration measurements further investigate the latter component using a state-of-the-art slamming-detection
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Hydrodynamic modelling and motion characteristics of flexible swimming limbs for asymmetric swinging underwater soft robots Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-15 Qingzhong Li, Wenxin Mu, Yingbo Wang, Yuan Chen
In this paper, an asymmetrical swinging bionic mantis shrimp underwater soft robot based on dielectric elastomers is presented. This robot can be driven through water by swinging swimming limbs. Flexible swimming limbs with different geometries are designed, and computational fluid dynamics (CFD) simulations are utilized to explore the optimal motion efficiency and adaptive geometry. Furthermore, hydrodynamic
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Reverse-seepage and saturation action anti-corrosion tech (RS-AAT) for corrosion resistance and self-healing of cracked concrete in seawater immersion Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-08 Jianzhao Ding, Liang Xiao, Guoxiong Mei, Arafat Easin
Reverse-seepage and Saturation based Action Anti-corrosion Tech (RS-AAT) is a cutting-edge technology that saturates concrete materials and provides anti-hydraulic pressure to offer robust protection against chloride salt-induced corrosion. This study examined the crack repair capability and anti-chloride invasion effect of RS-AAT-treated concrete by experimental and numerical analyses. The results
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Physically accurate real-time synthesis of ocean waves for maritime simulators Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-08 Luca Donatini, Jeroen Verwilligen, Guillaume Delefortrie, Marc Vantorre, Evert Lataire
The most efficient approach to the synthesis of multi-directional ocean waves is the so-called Fourier approach, based on a spectral description of waves in wavenumber space. According to this approach, 2D wavenumber spectra are transformed into spatial wave quantities by means of 2D Inverse Discrete Fourier Transforms. The Fourier approach is well described in literature, but the majority of works
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Analysis and prediction of vibro-acoustic characteristics of parallel propulsion systems for large-scale marine ships Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-08 Jianghai Xu, Xueliang Liu, Zhongliang Xie, Chunxiao Jiao, Na Ta, Zhushi Rao
The parallel power propulsion system is the preferred option for large-scale ships. The improper configuration of multidimensional power parameters is a significant factor contributing to the vibration and noise generated by the system. This study examines the sensitivity and dependence of the vibro-acoustic characteristics of the system on various power parameters through theoretical and experimental
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Experimental and CFD analysis of roll damping of a wind turbine installation vessel Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-09 Rasmus Byrdal Kjær, Yanlin Shao, Jens Honoré Walther
The global transition to renewable energy has put pressure on wind turbine installation vessels (WTIV), thus creating an urgent demand for optimizing their operation. This includes more accurate predictions of the ship motions at sea, at which roll motion is of particular interest. For accurate prediction of the roll motion, roll damping is important to consider and is commonly found from empirical
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Assessing some statistical and physical modelling uncertainties of extreme responses for monopile-based offshore wind turbines, using metocean contours Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-09 George Katsikogiannis, Sverre K. Haver, Erin E. Bachynski-Polić
This study examines the influence of probabilistic models for wave parameters in the joint environmental model and hydrodynamic/soil models on extreme mudline bending moments for monopile-based wind turbines at representative wind speeds, using the environmental contour method. For significant wave height, the 3-parameter Weibull model using the method of moments (MoM) provides the best fit to hindcast
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Design and analysis of a passive adaptive wall-climbing robot on variable curvature ship facades Appl. Ocean Res. (IF 4.3) Pub Date : 2024-01-09 Pei Yang, Lingyu Sun, Minglu Zhang
To improve the adaptive motion performance of traditional wall-climbing robots on variable-curvature facades, a crawler-type wall-climbing robot suitable for ship wall features is proposed by utilizing the advantages of passive mechanisms in realizing autonomous robots. The robot consists of two passive adaptive crawler mechanisms and a connecting module. Each track structure contains multiple permanent