Applied Ocean Research最新文献_第4页

Comprehensive feature-based machine learning for fast prediction of marine propeller's open-water performance 基于特征的综合机器学习可快速预测船用螺旋桨的开放水域性能

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104310

Liang Li , Yihong Chen , Shuo Xie , Yucheng Xiao , Tian Fang , Chao Wang

{"title":"Comprehensive feature-based machine learning for fast prediction of marine propeller's open-water performance","authors":"Liang Li , Yihong Chen , Shuo Xie , Yucheng Xiao , Tian Fang , Chao Wang","doi":"10.1016/j.apor.2024.104310","DOIUrl":"10.1016/j.apor.2024.104310","url":null,"abstract":"<div><div>To address the strong demand for the efficient iterative design of marine propellers, this study researched a rapid prediction surrogate model for propeller open-water performance using a dataset comprising 1980 propeller open-water performance test results. A dimension reduction method based on comprehensive features is proposed, and eight input parameters were determined through correlation and importance analysis. Five machine learning algorithms were utilized to construct the prediction surrogate model employing the Grid Search combined with K-fold Cross-Validation. The validation results indicate that the SVR model performed the best on the validation set, with errors in predicting <em>K<sub>T</sub></em>,10<em>K<sub>Q,</sub></em> and <em>η</em> within 2 %. Further validation was conducted on three unseen propellers in the test set and two new design propeller schemes. It is found that the SVR model, based on comprehensive features, demonstrated good accuracy for the open-water performance prediction of unseen propeller schemes, with errors within 4 %. Compared with the CFD method, the computational performance of the SVR model is approximately 1000 times faster<em>.</em> Additionally, it effectively identifies load variations resulting from overall or local adjustments in pitch distribution, providing new means for rapid performance prediction and optimization design of marine propellers.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104310"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656216","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 Study on Sediment Suspension over the Liquefied Sand-clay Seabed under Waves 波浪作用下液化砂粘土海底沉积物悬浮实验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104314

Jun Zhang , Lizhu Wang , Zhiyong Zhang , Yihao Sun

引用次数: 0

Triaxial test on load-bear capacity of the vibro-compaction coral sand foundation in the South China Sea 南海振冲夯实珊瑚砂地基承载力的三轴试验

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104321

Ru Qu , Chenghao Ma , Haifeng Liu , Changqi Zhu , Tao Hu

{"title":"Triaxial test on load-bear capacity of the vibro-compaction coral sand foundation in the South China Sea","authors":"Ru Qu , Chenghao Ma , Haifeng Liu , Changqi Zhu , Tao Hu","doi":"10.1016/j.apor.2024.104321","DOIUrl":"10.1016/j.apor.2024.104321","url":null,"abstract":"<div><div>Vibro-compaction is the main improvement method for hydraulic reclamation coral sand sites. Currently, the load-bearing characteristics of coral sand composite foundation reinforced by vibro-compaction have not been clarified. This paper investigates strength characteristics of coral sand composite samples (core and shell) by artificially preparing radial variable-density coral sand composite samples and performing consolidated drained triaxial tests under different area replacement rates, core-shell density ratios, and confining pressures. The results of the study show that the contribution of the core gradually increases with the increasing area replacement rate. The peak strength and peak friction angle of samples also increase gradually, but the growth tendency gradually slows down. The stress concentration coefficient of sample core is variable and follows a development pattern of first increasing and then decreasing. The secant Young's modulus of composite samples increases in a power function type with the increase of area replacement rate. The particle breakage of samples is mainly the rupture and abrasion of the 0.5–1 mm and 0.1–0.25 mm particle groups that serve as fillers. The research results can provide technical support for coral reef engineering construction.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104321"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659168","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

Response of bioinspired scale arrangement in a suction caisson to penetrating into clay reflected by using interface direct shear tests 通过界面直接剪切试验了解吸力沉箱中的生物启发鳞片排列对穿透粘土的反应

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104322

Dayong Li, Yongan Ma, Jipeng Zhao

{"title":"Response of bioinspired scale arrangement in a suction caisson to penetrating into clay reflected by using interface direct shear tests","authors":"Dayong Li, Yongan Ma, Jipeng Zhao","doi":"10.1016/j.apor.2024.104322","DOIUrl":"10.1016/j.apor.2024.104322","url":null,"abstract":"<div><div>The suction caisson has been used to support the offshore wind turbine in last decade. Normally, the resistance of the traditional suction caisson (TSC) to penetrating into the seabed is overcome by suction resulting in high soil plug causing early termination in installation. Therefore, this study proposes a novel scaled suction caisson (SSC) that adopts the bionic design concept of little forward resistance and large backward resistance in scaled belly of reptiles like snakes. The bioinspired scale is set on the outer sidewall of the TSC, which is called the SSC. Scale arrangement is the key factor to reduce penetration resistance of the SSC. To simulate the penetration, the interfacial direct shear tests are carried out along the cranial direction (i.e., forward direction of the snake). The interfacial behavior of the scaled steel plate and clay is studied under different consolidation pressures and normal stresses. The results show that normal stress is the key factor compared with the consolidation pressure. There are clay-scale shear zone and clay-clay shear zone during shearing with the increase of the scale height, respectively. In addition, the theoretical formula for calculating critical shear stress is proposed, and the calculated results are in great agreement with the model test. As the scale height increases from 0.5 mm to 1.5 mm, the peak shear stress first increases and then decreases. Meanwhile, it is determined that the design of the scale height in the clay cannot exceed 108 <em>d</em><sub>50</sub>. Finally, the optimal geometric characteristics and scale arrangements of the SSC are determined by analyzing the peak shear stress and peak internal friction angle of various scale-clay interfaces. The results can contribute to optimizing the scales arrangement for easy penetration of the SSC in clay.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104322"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656214","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 investigation on the sloshing dynamics of first- and super-harmonic resonances in a rectangular tank with and without a vertical baffle 带垂直障板和不带垂直障板的矩形水槽中首谐波和超谐波共振的荡涤动力学实验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104315

Yiran Li , Dongxi Liu , Jin Wang

{"title":"Experimental investigation on the sloshing dynamics of first- and super-harmonic resonances in a rectangular tank with and without a vertical baffle","authors":"Yiran Li , Dongxi Liu , Jin Wang","doi":"10.1016/j.apor.2024.104315","DOIUrl":"10.1016/j.apor.2024.104315","url":null,"abstract":"<div><div>The sloshing dynamics of the first- and super-harmonic resonances in clean and baffled tanks were experimentally investigated within a wide excitation frequency range. The first-harmonic resonance (i.e., primary resonance) was generated on the liquid surface when the excitation frequency approached the natural frequency in the sloshing system. The installation of the vertical baffle effectively suppressed the violent sloshing at the excitation frequency near the lowest natural frequency. However, the vertical baffle negligibly suppressed the sloshing at higher frequencies. Additionally, the vertical baffle installation locations influenced the natural frequency of the system. In addition to the first-harmonic resonance, the super-harmonic resonance (i.e., secondary resonance) was excited, even when the excitation frequency was far from the natural frequency of the system. Furthermore, the effect of liquid viscosity on the sloshing dynamics of first- and super-harmonic resonances is investigated. It demonstrates that the liquid viscosity has a significant suppression effect on the resonant sloshing at the lowest and the higher modes. Due to the reduction of the nonlinearity, the super-harmonic resonance become difficult to be excited.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104315"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659167","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

Characterization of the solidity of knotted single-twine diamond mesh netting 打结单线菱形网的坚固性表征

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104295

Francisco Bottero, Manuel González

{"title":"Characterization of the solidity of knotted single-twine diamond mesh netting","authors":"Francisco Bottero, Manuel González","doi":"10.1016/j.apor.2024.104295","DOIUrl":"10.1016/j.apor.2024.104295","url":null,"abstract":"<div><div>Solidity is an essential parameter of netting in fishing and aquaculture applications, since it is used to derive and apply empirical formulae of drag and lift coefficients. This work derives an analytical formula for calculating the solidity of knotted polyethylene single-twine diamond mesh netting, a very common netting in the fishing industry. It also introduces the concept of line-of-sight solidity at a given angle of attack, as opposed to traditional normal solidity, which could help better explain the hydrodynamic behavior of this kind of netting under different conditions. Based on a detailed 3D geometric model of the netting, an analytical expression for the line-of-sight solidity is also derived, as a function of twine diameter, mesh length, mesh opening, orientation (T0 or T90) and angle of attack of the netting. The analytical expression for solidity was validated with experimental measurements from digital images of netting at different configurations, showing excellent agreement across the entire range of parameters. It was investigated how different netting parameters influence the solidity, which increases non-linearly as the angle of attack decreases. It was found that the normalized solidity, the ratio between line-of-sight solidity and normal solidity, does not depend the twine diameter or mesh length, except in some particular cases. In general, the line-of-sight solidity begins to be greater than the normal solidity for angles of attack less than approximately 65°, although this depends on the orientation and mesh opening of the netting.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104295"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656215","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 study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles 考虑不同倾角的富水倾斜复合地层盾构隧道工作面稳定性试验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104323

Xiaopu Cui , Pengfei Li , Zhaoguo Ge , Shaohua Li , Yang Chen

{"title":"Experimental study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles","authors":"Xiaopu Cui , Pengfei Li , Zhaoguo Ge , Shaohua Li , Yang Chen","doi":"10.1016/j.apor.2024.104323","DOIUrl":"10.1016/j.apor.2024.104323","url":null,"abstract":"<div><div>Shield method has developed rapidly in the construction of underground or subsea tunnels. The stability of the tunnel excavation face is essential for the safe construction of tunnels, particularly in water-rich and inclined strata. The present study conducted shield model tests in water-rich inclined strata to analyze the surface settlement, ground earth pressure, areas of instability, and failure mechanism during the process of instability. The results indicate a decrease in settlement of the longitudinal monitoring points as the backward distance from the tunnel boundary line increases. Additionally, the settlement analysis of transverse monitoring sections reveals that the most significant settlement occurs directly above the tunnel. When equidistant from the tunnel excavation face, the surface settlement exhibits a significantly greater magnitude in front of it compared to behind it. The extent of influence is maximized when the inclination angle is negative, regardless of whether it pertains to the collapse in width or height on the surface. The application of DIC image analysis reveals that distinct failure mechanisms are observed for varying stratum inclination angles. The shear strain concentration becomes more pronounced with an increase in the backward distance, resulting in predominant distribution of shear bands in front of and above the tunnel. Compared to water-rich horizontal stratification or homogeneous soil layers, there are distinct variations in surface collapse magnitude, stratum disturbance range, and the instability mechanism of stratum instability in water-rich inclined strata. Therefore, when confronted with engineering projects involving inclined strata, it is imperative to consider the influence of geological factors.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104323"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656211","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

Underwater experimental study on breaking characteristics of deep-sea seafloor massive sulfide 深海海底块状硫化物破碎特性的水下实验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-12 DOI: 10.1016/j.apor.2024.104311

Bei Zhang , Haining Lu , Jianmin Yang , Zhongqin Lin , Shihang Liu

{"title":"Underwater experimental study on breaking characteristics of deep-sea seafloor massive sulfide","authors":"Bei Zhang , Haining Lu , Jianmin Yang , Zhongqin Lin , Shihang Liu","doi":"10.1016/j.apor.2024.104311","DOIUrl":"10.1016/j.apor.2024.104311","url":null,"abstract":"<div><div>Research on cutting seafloor massive sulfide is in its initial stages; however, the breaking characteristics are unclear. In addition, the influence of water was not considered in the experimental research, and the reliability of the experimental results was low. Therefore, this study conducted experimental research on underwater cutting characteristics based on a high-fidelity simulation material. The mean and maximum cutting forces increased linearly with the cutting depth. The load of cutting high compressive strength (HUCS) rocks is 2.78 times that of cutting low compressive strength (LUCS) rocks. With an increase in the cutting depth, the percentage of powdered rock decreased, the percentage of blocks increased, and the overall chip size increased. The overall chip size obtained by cutting the HUCS rock was larger than that obtained by cutting the LUCS rock. As the cutting depth increases, the cutting-specific energy consumption decreases. Cutting HUCS rock consumes more energy than cutting LUCS rock. In summary, the cutting depth of HUCS and LUCS rocks should be recommended to be 16mm. This research is of guiding significance for the optimisation of the mining head structure and mining engineering practice.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104311"},"PeriodicalIF":4.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659268","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

Acoustic emission signals characterization and damage source localization in composite heterogeneous panels 复合异质板中的声发射信号特征和损伤源定位

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-11 DOI: 10.1016/j.apor.2024.104308

Zhimin Zhao , Nian-Zhong Chen

{"title":"Acoustic emission signals characterization and damage source localization in composite heterogeneous panels","authors":"Zhimin Zhao , Nian-Zhong Chen","doi":"10.1016/j.apor.2024.104308","DOIUrl":"10.1016/j.apor.2024.104308","url":null,"abstract":"<div><div>Geometry and materials of wind turbine blades are becoming more and more complex, leading to great challenges in the structural health monitoring of wind turbine blades. In particular, a large number of composite heterogeneous structures are used in wind turbine blades. In this paper, a novel acoustic emission (AE) based method is proposed for structural damage localization in such composite heterogeneous panels. Firstly, the attenuation and frequency propagation characteristics of AE signals are systematically investigated. Subsequently, AE signals undergo a transformation into graph-structured data utilizing graph theory and wavelet coefficients to extract intricate signal features. Then, a graph convolutional network (GCN)-based method is proposed to learn the features of the constructed graphs and to predict the coordinates of AE sources. The effectiveness of the proposed method is validated by pencil lead break (PLB) experiments conducted on a composite heterogeneous panel. The results demonstrate that the proposed method can accurately locate the position of AE sources and it outperforms traditional convolutional neural network (CNN) approaches.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104308"},"PeriodicalIF":4.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659267","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 review of pressure loss characteristics during water waves passaging through perforated plates 水波通过穿孔板时的压力损失特性综述

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-10 DOI: 10.1016/j.apor.2024.104300

Ai-jun Li, Yong Liu, Hua-jun Li

{"title":"A review of pressure loss characteristics during water waves passaging through perforated plates","authors":"Ai-jun Li, Yong Liu, Hua-jun Li","doi":"10.1016/j.apor.2024.104300","DOIUrl":"10.1016/j.apor.2024.104300","url":null,"abstract":"<div><div>When water waves pass through a perforated thin plate (wall), the wave energy will be partially dissipated and the phase of wave motion is also shifted. In the potential flow analysis, an appropriate boundary condition needs to be imposed on the perforated plate to consider the energy dissipation and phase shift. This paper reviews the pressure loss conditions on perforated plates used in the potential flow analysis, i.e., the relationships between the pressure difference on both sides of the plate and the normal fluid velocity across the plate. These conditions include two kinds of linear boundary conditions based on Darcy law and porous medium theory, respectively, and two kinds of quadratic boundary conditions based on the viewpoints of Mei et al. (1974) and Molin (1992), respectively. Several methods for estimating the control parameters (such as porous effect parameter, linearized resistance coefficient, discharge coefficient, and blockage coefficient) in the pressure loss conditions are also reviewed. The internal relations between two linear conditions, between two nonlinear conditions, and between linear and nonlinear conditions are expounded. Then, water wave interaction with a perforated caisson breakwater is considered to show the application of different pressure loss conditions on perforated plates. Finally, the possible research orientation of the pressure loss conditions and their control parameters are prospected.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104300"},"PeriodicalIF":4.3,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659169","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