Ocean Engineering最新文献_第4页

Design and laboratory validation of multistructured acoustic resonators for the attenuation of airborne machinery noise in ships

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120515

Mathis Vulliez , Giuseppe Catapane , Marc-André Guy , Kamal Kesour , Jean-Christophe Gauthier Marquis , Raphaël Jeanvoine , Frédéric La Madeleine , Kévin Verdière , Giuseppe Petrone , Olivier Robin

{"title":"Design and laboratory validation of multistructured acoustic resonators for the attenuation of airborne machinery noise in ships","authors":"Mathis Vulliez , Giuseppe Catapane , Marc-André Guy , Kamal Kesour , Jean-Christophe Gauthier Marquis , Raphaël Jeanvoine , Frédéric La Madeleine , Kévin Verdière , Giuseppe Petrone , Olivier Robin","doi":"10.1016/j.oceaneng.2025.120515","DOIUrl":"10.1016/j.oceaneng.2025.120515","url":null,"abstract":"<div><div>Ship machinery generates significant noise levels, mainly including energetic and low-frequency tonal components, posing two issues. The first is linked to potential health and safety problems related to onboard noise, mainly for the crew working in the engine room. The second concern is that the underwater noise generated by machinery can harm marine life. Conventional sound-absorbing materials are hardly efficient in mitigating low-frequency tonal components. This study introduces multistructured acoustic resonators for machinery noise attenuation. These resonators are based on either Helmholtz resonators, labyrinthine quarter wavelength tubes, or spiral quarter wavelength tubes embedded into a broadband soundproofing material. Design elements are provided for each resonator type, and their effectiveness in reducing machinery noise is evaluated using numerical simulations and tests primarily conducted using a low-frequency impedance tube and a reverberant room. The subsequent validation steps and perspectives are finally summarized.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120515"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143343752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multilayered depth-averaged formulation for immiscible gravity currents

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120452

Naveed Ul Hassan Bhat , Gourabananda Pahar

{"title":"Multilayered depth-averaged formulation for immiscible gravity currents","authors":"Naveed Ul Hassan Bhat , Gourabananda Pahar","doi":"10.1016/j.oceaneng.2025.120452","DOIUrl":"10.1016/j.oceaneng.2025.120452","url":null,"abstract":"<div><div>Lock exchange represents the progression of a gravity current caused by the instantaneous release of a heavy fluid into a lighter ambient fluid. The pressure gradient, on account of density difference, imparts motion of the current, leading to flow in the ambient fluid. Full-scale multiphase models (Eulerian/Lagrangian) have been developed to simulate these processes; however, they have substantial computational costs due to the specific nature of the models. On the contrary, the single/two-layered depth-averaged models are restricted by the range of density ratio owing to their simplified nature. In the current work a variable density multilayered shallow water model is developed to simulate the gravity current dynamics. The progression of the density front is delineated by a scalar transport equation, with the multilayered formulation offering a piecewise vertical variation of flow properties (velocity). The model is applied to the theoretical lake-at-rest condition, a set of lock exchange experimental scenarios and spreading of an oil spill over water surface. The model yields substantial agreement in computed and observed profiles of density current. Additionally, the model’s applicability to high-density gradients is explored through a representative case depicting the model’s capability for non-Boussinesq density graded flows.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120452"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and numerical study of a pitching airfoil interacting with the vortical wake of an upstream cylinder

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120559

Mehdi Pouyan Rad, Abdolamir Bak Khoshnevis

{"title":"Experimental and numerical study of a pitching airfoil interacting with the vortical wake of an upstream cylinder","authors":"Mehdi Pouyan Rad, Abdolamir Bak Khoshnevis","doi":"10.1016/j.oceaneng.2025.120559","DOIUrl":"10.1016/j.oceaneng.2025.120559","url":null,"abstract":"<div><div>The turbulence properties of the upstream flow have a significant impact on the aerodynamic behavior of an airfoil in various applications. Two key parameters in the upstream flow are the presence of vortices and changes in flow direction. Studying these parameters is crucial when analyzing airfoil-based shapes in real-world scenarios. In this study, a vortical environment is created using a circular cylinder, and changes in flow direction are simulated using a pitching airfoil. The vortical flow passed a pitching airfoil is analyzed experimentally and numerically at different reduced frequencies(<span><math><mrow><msub><mi>k</mi><mi>f</mi></msub><mo>)</mo></mrow></math></span>, the ratio of the gap to the cylinder diameter(<span><math><mrow><mi>G</mi><mo>/</mo><mi>D</mi></mrow></math></span>), and pitching oscillation amplitude(<span><math><mrow><msub><mi>α</mi><mn>0</mn></msub></mrow></math></span>). The flow behavior is presented in experimental terms of the mean streamwise velocity(<span><math><mrow><mover><mi>U</mi><mo>‾</mo></mover></mrow></math></span>), turbulence intensity(Ti), and power spectral density(PSD) downstream of the pitching airfoil, and numerical contours of velocity field, turbulence intensity, and vorticity. The current study confirms the change in time and frequency domain parameters and provides new insight into the unsteady airfoils. The results show a change in the shedding mechanism in the case of <span><math><mrow><mi>G</mi><mo>/</mo><mi>D</mi><mo>=</mo><mn>2</mn></mrow></math></span>, emerging two periodic vortical streets in the wake of pitching airfoil in the case of <span><math><mrow><mi>G</mi><mo>/</mo><mi>D</mi><mo>=</mo><mn>6</mn><mspace></mspace><mtext>and</mtext><mspace></mspace><mn>10</mn></mrow></math></span>, and replacing cylinder vortex shedding frequency with pitching frequency of airfoils.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120559"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A real-time crack detection approach for underwater concrete structures using sonar and deep learning

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120582

Leiming Zheng , Huiming Tan , Chicheng Ma , Xuanming Ding , Yifei Sun

{"title":"A real-time crack detection approach for underwater concrete structures using sonar and deep learning","authors":"Leiming Zheng , Huiming Tan , Chicheng Ma , Xuanming Ding , Yifei Sun","doi":"10.1016/j.oceaneng.2025.120582","DOIUrl":"10.1016/j.oceaneng.2025.120582","url":null,"abstract":"<div><div>This paper introduces a real-time crack detection approach for underwater concrete structures using sonar and deep learning to overcome limitations in low-light or turbid environments where optical imaging struggles. Specifically, a crack detection model based on the YOLOv5s architecture was developed for sonar images, incorporating attention mechanisms and the SIoU loss function to improve detection accuracy. Given the scarcity of acoustic crack image data, a two-stage transfer learning approach was implemented, leveraging both source domain data (publicly available optical crack images) and target domain data acquired from on-site acoustic detection experiments. Ablation studies and comparisons with other advanced models indicate that the proposed model achieves robust detection accuracy ([email protected] = 0.768) with an inference speed of 134 FPS, making it suitable for real-time applications. Additionally, a pixel-based analysis method was used to estimate overall crack dimensions, providing valuable insights into crack characteristics and their potential structural impact.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120582"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143344366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A numerical investigation of flow-induced vibrations on crescent-shaped iced circular cylinders

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120445

Xiaogang Yang , Zhitao Yan , Mengzhu Li , Yongli Zhong , Jun Luo

{"title":"A numerical investigation of flow-induced vibrations on crescent-shaped iced circular cylinders","authors":"Xiaogang Yang , Zhitao Yan , Mengzhu Li , Yongli Zhong , Jun Luo","doi":"10.1016/j.oceaneng.2025.120445","DOIUrl":"10.1016/j.oceaneng.2025.120445","url":null,"abstract":"<div><div>This study employs numerical simulation to investigate the flow-induced vibration (FIV) characteristics of crescent-shaped iced circular cylinders subjected to crossflow. The analysis spans a reduced velocity range of <em>U</em><sub><em>r</em></sub> = 3.0 to 24.0, corresponding to a Reynolds number range of Re = 1836 to 14692. Two distinct ice thicknesses are examined, both with a mass-damping ratio of <em>m</em>∗<em>ζ</em> = 0.185. The research comprehensively examines the amplitude, frequency, aerodynamic forces, phase, and wake characteristics of the iced cylinders, particularly focusing on scenarios where ice accretion faces downstream. The results indicate that the lightly-iced cylinder (LIC) exhibits combined vortex-induced vibration (VIV) and galloping. In contrast, the heavily-iced cylinder (HIC) undergoes galloping only at high <em>U</em><sub><em>r</em></sub>. Moreover, the instantaneous amplitude, phase difference, and vibration frequency are interrelated. For the LIC, as the galloping region approaches the VIV region, a negative aerodynamic damping emerges, thereby triggering galloping. Additionally, the effect of the icing angle on the cylinder response is also explored. This research not only enhances our understanding of FIV in iced circular cylinders but also provides valuable insights into potential applications in energy harvesting through FIV.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120445"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance analysis of the passive heave compensation system for dual barge float-over operation

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120576

Junfeng Du, Shujie Zhao, Deqing Zhang, Anteng Chang

{"title":"Performance analysis of the passive heave compensation system for dual barge float-over operation","authors":"Junfeng Du, Shujie Zhao, Deqing Zhang, Anteng Chang","doi":"10.1016/j.oceaneng.2025.120576","DOIUrl":"10.1016/j.oceaneng.2025.120576","url":null,"abstract":"<div><div>The dual barge float-over technique, incorporating a passive heave compensation (PHC) system, presents an efficient solution to the challenges posed by the installation of increasingly larger offshore structures. Despite its potential, the efficiency of the PHC system in reducing motions and its influence on the multi-body dynamic characteristics of the dual barge float-over system remain insufficiently explored. In this study, a comprehensive analysis of the PHC system's performance in dual barge float-over installation of a substation was conducted. A numerical model of the system was established in both the frequency and time domains. The motion properties of the multibody system were analyzed under varying gas volumes and damping coefficients in the frequency domain. The results indicate that while the PHC system reduces substation's motion amplitudes around the primary frequencies, it simultaneously induces secondary resonant motions with larger amplitudes in the low-frequency range. However, the time domain simulation based on the North Sea wave scatter diagram data reveals that the influence of these secondary resonant motions on the overall performance of the PHC system is negligible. The analysis proves that the PHC system significantly enhances the dual barge float-over technique's operability, particularly in beam waves and at high wave heights.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120576"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ship hull resistance minimization using surrogate modelling and an improved dung beetle optimizer

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120588

Huixia Zhang , Yuchen Wei , Shenghao Xiao , Zhao Zhao

引用次数: 0

Slender-body approach for computing second-order wave loads in the frequency domain

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120558

Lucas Carmo, Matthew Hall

{"title":"Slender-body approach for computing second-order wave loads in the frequency domain","authors":"Lucas Carmo, Matthew Hall","doi":"10.1016/j.oceaneng.2025.120558","DOIUrl":"10.1016/j.oceaneng.2025.120558","url":null,"abstract":"<div><div>This work presents a slender-body approach to evaluate the second-order wave loads acting on a floating structure in the frequency domain. The approach is in the same spirit as the common use of Morison’s equation to approximate the wave loads without solving the radiation/diffraction problem. To do so, we employ Rainey’s equation, which can be seen as an extension of the inertial part of Morison’s equation to include nonlinear effects. We introduce modifications to Rainey’s formulation in order to evaluate wave kinematics at the mean body position instead of the original approach of considering instantaneous displacements. We also propose a simple approximation to partially account for wave scattering effects on the second-order loads based on the analytical solution of a surface-piercing bottom-mounted vertical circular cylinder. Though limited to structures composed of cylinders, this slender-body approach is orders of magnitude faster than computing second-order wave coefficients with a radiation/diffraction code. We implemented this approach for difference-frequency (slow drift) loads in an open-source frequency-domain floating wind turbine model. We present comparisons against results obtained with radiation/diffraction theory for three reference floating wind turbine designs: the OC3-Hywind spar, the OC4-DeepCwind semisubmersible, and the VolturnUS-S semisubmersible. In general, the results show that the proposed slender-body approach with the correction to approximate wave scattering effects provides useful estimations of the difference-frequency wave loads and the resulting motions of the floater.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120558"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on multi-objective optimisation design of pump-jet propulsion

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2024.120086

Yu Lu , Chenran Li , Zhuhao Gu, Chunxiao Wu, Siyu Shao

{"title":"Research on multi-objective optimisation design of pump-jet propulsion","authors":"Yu Lu , Chenran Li , Zhuhao Gu, Chunxiao Wu, Siyu Shao","doi":"10.1016/j.oceaneng.2024.120086","DOIUrl":"10.1016/j.oceaneng.2024.120086","url":null,"abstract":"<div><div>The pump-jet propulsion is a highly efficient and low-noise propulsion system for underwater vehicles, attracting widespread attention due to its superior performance. However, the complex structure presents significant challenges for performance prediction and design optimisation. Against this backdrop, this study aims to address these challenges by selecting key feature parameters from the fully parameterized configuration of the pump-jet propulsion system as optimisation design variables and developing a fully parameterized modeling method. With hydrodynamic performance and noise reduction as the optimisation objectives, a multi-objective optimisation system was established using a global intelligent optimisation algorithm. Unlike traditional design approaches, this paper introduces an innovative strategy where geometric variations are driven in a manner counter to the optimisation objectives. Through an automated process, a novel configuration was derived, demonstrating significant improvements in both hydrodynamic and noise performance compared to the original design. The findings provide valuable insights into the multi-objective performance optimisation and parameter design of propulsion systems, achieving a highly automated workflow that integrates design, simulation, and optimisation, thereby improving optimisation efficiency. The proposed method's innovation and versatility make it applicable to the design optimisation of other complex propulsion systems, offering essential technical references for future advancements in propulsion technology design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120086"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the scaling law of the hydrodynamic energy of storm surges over an idealized topography

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-02-05 DOI: 10.1016/j.oceaneng.2025.120547

Hanhan Lin, Binchuan Nie, Feng Xu

{"title":"On the scaling law of the hydrodynamic energy of storm surges over an idealized topography","authors":"Hanhan Lin, Binchuan Nie, Feng Xu","doi":"10.1016/j.oceaneng.2025.120547","DOIUrl":"10.1016/j.oceaneng.2025.120547","url":null,"abstract":"<div><div>Storm surges contain a variety of energies accompanied with complex generation, dissipation and internal conversion. In this study, the temporal and spatial features of energies of current are investigated using numerical simulation of storm surges over an idealized topography relying on the surge-wave coupled model. The evolution of energies is distinct when the tropical cyclone is over the deep-water, continental slope, continental shelf, near coast and post-landing regions. Energy accumulates in the deep-water region, dissipates on the continental slope and reaccumulates again on the continental shelf where the kinetic energy of current is the main form of energy. The kinetic energy is further transported to the inundation region by the intrusion water body, which is responsible for the increase of energy in the inundation region. A scaling law is proposed to estimate the maximum kinetic energy of current. On the other hand, the spatial modes indicate that the main energy input/dissipation region shifts to the near coast region from the continental slope with the increase of translation speed of tropical cyclones. That is because of the competition between the decrease of energy input duration and the increase of wind speed with the increase of translation speed. Further, the scaling laws of nondimensionalized maximum energy of current in the inundation region, inundation area and volume of the intrusion water are obtained and validated numerically.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"322 ","pages":"Article 120547"},"PeriodicalIF":4.6,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0