Journal of Ocean Engineering and Science最新文献_第5页

Experimental study on the influence of cutting parameters on cutting characteristics of deep-sea seafloor massive sulfide 切削参数对深海海底块状硫化物切削特性影响的实验研究

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-11-09 DOI: 10.1016/j.joes.2024.10.001

Bei Zhang , Haining Lu , Zhongqin Lin , Shihang Liu , Liwen Deng

{"title":"Experimental study on the influence of cutting parameters on cutting characteristics of deep-sea seafloor massive sulfide","authors":"Bei Zhang , Haining Lu , Zhongqin Lin , Shihang Liu , Liwen Deng","doi":"10.1016/j.joes.2024.10.001","DOIUrl":"10.1016/j.joes.2024.10.001","url":null,"abstract":"<div><div>The research of seafloor massive sulfide cutting characteristics is in the initial stage, and experimental methods are rarely used to conduct research. In addition, the mechanism of cutting parameters influencing cutting characteristics is not clear. In order to clarify the influence mechanism, the influences of cutting depth and cutting velocity on cutting characteristics are studied experimentally. It is found that with the increase of cutting depth, the load fluctuation is more severe, the breaking yield is increased, the size of the chip is increased, the powdered percentage is decreased, and the externally expanded breaking zone of rock is wider. However, the cutting depth has little effect on the cutting angle, and the breaking angle is between 48° and 61° With the increase in cutting velocity, the number of load fluctuations per unit of time increases significantly, and the size of the chip decreases. However, the breaking yield, powdered percentage, breaking angle and external expansion area remain basically unchanged. The research is of guiding significance to the optimization of the mining head structure and the selection of cutting parameters.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 705-723"},"PeriodicalIF":11.8,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

ADRC-Based cooperative control for unmanned towing operation by multiple DP tugboats: A comparative study of two cooperative controllers 基于adrc的多艘DP拖船无人拖航协同控制：两种协同控制器的比较研究

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-10-18 DOI: 10.1016/j.joes.2024.09.004

Xu Jiang , Lei Wang , Yiting Wang

{"title":"ADRC-Based cooperative control for unmanned towing operation by multiple DP tugboats: A comparative study of two cooperative controllers","authors":"Xu Jiang , Lei Wang , Yiting Wang","doi":"10.1016/j.joes.2024.09.004","DOIUrl":"10.1016/j.joes.2024.09.004","url":null,"abstract":"<div><div>This paper addresses the challenge of coordinated manipulation of an unactuated floating object by multiple tugboats to execute both positioning and towing operation within complex marine environments. We proposes a multi-layer cooperative control algorithm for the multi-tugboat system, including tugboat control level and cooperative control level. At the individual tugboat control level, the dynamic positioning system (DPS) has been enhanced to match the operational behavior of the tugboat, enabling it to handle cable tension and environmental disturbances during transit. The controller incorporates a simple yet effective linear active disturbance rejection control method (ADRC) to counter external disturbances and ensure accurate trajectory tracking without relying on preset models. Moving to the multi-tugboat collaboration level, two distinct control strategies are proposed for towing operations: formation-based (FB) and force-allocation-based (FAB). The FB strategy involves multiple tugboats forming a coordinated formation, with control focused on the formation center to indirectly manipulate the object. On the other hand, the FAB strategy utilizes model predictive control (MPC) for the object to allocate the necessary towing force for each cable, thereby determining the required actions for each tugboat based on the cable model and the needed towing force. Simulation results demonstrate that both control strategies can effectively maneuver the floating object with high accuracy to perform positioning and towing tasks. Nevertheless, due to the variations in their fundamental mechanisms, there are significant discrepancies in towline tension, tugboat utilization, and energy consumption.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 692-704"},"PeriodicalIF":11.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Developing a virtual physical system for vortex-induced vibration studies of a bluff body 研究钝体涡激振动的虚拟物理系统

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-10-17 DOI: 10.1016/j.joes.2024.09.003

Haojie Ren , Shixiao Fu , Mengmeng Zhang , Yuwang Xu , Hao Ren

{"title":"Developing a virtual physical system for vortex-induced vibration studies of a bluff body","authors":"Haojie Ren , Shixiao Fu , Mengmeng Zhang , Yuwang Xu , Hao Ren","doi":"10.1016/j.joes.2024.09.003","DOIUrl":"10.1016/j.joes.2024.09.003","url":null,"abstract":"<div><div>A virtual physical system (VPS) for VIV studies of a bluff body is developed to replace the actual physical systems. It can arbitrarily and accurately control and edit the physical parameters, including mass, damping ratio and spring stiffness, specifically for the mass-spring-damper system. The recursive Duhamel integral method (DIM) with unconditional stability was used for the VPS control system, addressing real-time noise filtering problem and simplifying the system as a single input and single output (SISO) one. Delay compensation and inertial force elimination methods were investigated and proposed to overcome the crucial unwanted damping effects. An experimental facility for VIV model tests by VPS was manufactured, and the bluff body model with a measurement system was specially designed to accurately sense the hydrodynamic force during VPS operation. Systematic verification experiments for parameter editing and control of an actual physical target system were conducted, showing that the VPS can reproduce the equivalent spring-damper-mass system in high fidelity with an accuracy error of less than 5 %. VIV model tests for a bluff body at Reynolds numbers (<em>Re</em>= <em>UD</em>/<em>υ</em>, where <em>U</em> is the flow velocity, <em>D</em> represents the diameter of cylinder model, and <em>υ</em> is the kinematic viscosity coefficient) of 5.7E4 and 2.3E5 were performed using the VPS experimental facility, presenting well-Repeated VIV responses at low <em>Re</em> and unexpected VIV response with a large amplitude of 2.4 <em>D</em> at high <em>Re</em>, which can cause severe fatigue damage for relevant structures. The present VPS will provide promising and powerful experimental tools for VIV studies of a bluff body to reveal the related sensitive parameter effects.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 678-691"},"PeriodicalIF":11.8,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 guidance of solid element application in predicting the ultimate strength of flat plates in compression 实体元在平板极限抗压强度预测中的应用指南

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-10-15 DOI: 10.1016/j.joes.2024.09.002

Zhuo Wang , Xiangshao Kong , Weiguo Wu , Shen Li , Do Kyun Kim

{"title":"A guidance of solid element application in predicting the ultimate strength of flat plates in compression","authors":"Zhuo Wang , Xiangshao Kong , Weiguo Wu , Shen Li , Do Kyun Kim","doi":"10.1016/j.joes.2024.09.002","DOIUrl":"10.1016/j.joes.2024.09.002","url":null,"abstract":"<div><div>With the increasing demand in ocean engineering field for the ultimate limit state (ULS) analysis of thick plates, the solid (3D) element has been more frequently used in the ULS analysis. Compared to 2D element, 3D element can better consider the transverse shearing effect during the analysis which usually occurs on thick plates, due to its reliable reflection of geometrical characteristics and kinematic equations of the structures. Besides, 3D element can also facilitate the introduction of influencing factors into the ULS analysis, such as the erosions, cracks and residual stress. This may improve the simulation precision of ULS analysis of thick plate models. Until now, there is a lack of 3D element modelling technique in the ULS analysis of flat/stiffened plates. The present study aims to provide helpful information on 3D elements in the ULS analysis of flat plates under axial compression load. A total of 350 plate scenarios were adopted in the parametric study to consider the effects of 3D element shape (<em>α<sub>yz</sub></em>). It is found that the element shape significantly influences the ULS analysis of flat plates, where planar-like 3D element is not recommended. An empirical formula for determining the optimal 3D element shape of the finite element (FE) model is proposed based on the parametric results. A guidance for implementing the 3D elements is then documented, which may help engineers further understand the ultimate strength characteristic of very thick flat plates.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 661-677"},"PeriodicalIF":11.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Numerical simulations of a ship sailing across pack ice area in forward motion under different drafts 船舶在不同气流下向前穿越浮冰区域的数值模拟

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-09-21 DOI: 10.1016/j.joes.2024.09.001

Ming Zou , Xiang-Jie Tang , Lu Zou , Zao-Jian Zou , Chang-Zhe Chen , Xin-Shu Zhang

{"title":"Numerical simulations of a ship sailing across pack ice area in forward motion under different drafts","authors":"Ming Zou , Xiang-Jie Tang , Lu Zou , Zao-Jian Zou , Chang-Zhe Chen , Xin-Shu Zhang","doi":"10.1016/j.joes.2024.09.001","DOIUrl":"10.1016/j.joes.2024.09.001","url":null,"abstract":"<div><div>Different from the existing CFD-DEM models in which the ship remains stationary, a CFD-DEM model with the ship in forward motion is proposed in this paper to simulate the process of a ship sailing across pack ice area at a forward speed under different drafts. A high-precision method for generating pack ice area on the undisturbed free surface that can be used in conjunction with the proposed model is introduced. Taking an ice-strengthened Panamax bulker as study object, the available model test results are used to verify the reliability of the proposed model, which shows that the model can effectively evaluate the resistance performance and simulate the ship-ice-water interaction. Based on the verified model, the ice resistances on different parts of the hull are first investigated, which reveals that the ice resistance of the bow is most significant, while those of the midship and stern are negligible. Then, the speed dependence of ice resistance under different drafts is studied. It shows a strong nonlinearity under shallow draft, while the nonlinearity gradually weakens as the draft increases. Finally, the proportions of ice resistance and open-water resistance in the total resistance under different drafts and ship speeds are discussed.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 646-660"},"PeriodicalIF":11.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Influence of sample intervals in real-sea trails on the nonparametric model of 3-DoF ship motion predictions 真实海迹样本间隔对三自由度船舶运动预测非参数模型的影响

IF 11.8 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-09-17 DOI: 10.1016/j.joes.2024.08.002

Jiankun Lou , Hongdong Wang , Wenliang Yuan , Hong Yi

{"title":"Influence of sample intervals in real-sea trails on the nonparametric model of 3-DoF ship motion predictions","authors":"Jiankun Lou , Hongdong Wang , Wenliang Yuan , Hong Yi","doi":"10.1016/j.joes.2024.08.002","DOIUrl":"10.1016/j.joes.2024.08.002","url":null,"abstract":"<div><div>The accuracy of ship manoeuvrability models based on real sea trail data heavily relies on data quality, as noise and measurement errors pose significant challenges in data processing and model training. This study employs a deep learning approach for the nonparametric modelling of 3-DoF ship manoeuvrability predictions, utilizing data from zigzag tests conducted at sea. It examines how the limitations of measurement equipment affect data analysis, emphasizing the impact of different sample intervals on model accuracy. Our study further explores the efficacy of deep neural networks in capturing low-frequency components more effectively than high-frequency ones, discussing the data sampling process and frequency analysis in the response domain for training set construction. Simulation results indicate that both excessively small and large sample intervals can significantly compromise predictions of motion, location, and heading angles. Moreover, to enhance the evaluation of the deep learning-based nonparametric model, incorporating a test case with a minimal rudder angle is crucial for assessing the prediction precision. Generally, a sample interval ranging from 0.4 s to 0.6 s is identified as optimal for data down sampling in real sea trails, balancing accuracy and computational efficiency.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 5","pages":"Pages 621-645"},"PeriodicalIF":11.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Numerical and experimental studies on propulsion performance of a novel tandem paddles propulsor 新型串联式桨叶推进器推进性能的数值与实验研究

IF 13 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-09-07 DOI: 10.1016/j.joes.2024.08.001

Longqing Xin, Peng Liu, Huajun Li, Siqi Wang, Yuhua Lyu, Yaqian Li, Guodong Feng

{"title":"Numerical and experimental studies on propulsion performance of a novel tandem paddles propulsor","authors":"Longqing Xin, Peng Liu, Huajun Li, Siqi Wang, Yuhua Lyu, Yaqian Li, Guodong Feng","doi":"10.1016/j.joes.2024.08.001","DOIUrl":"10.1016/j.joes.2024.08.001","url":null,"abstract":"<div><div>Normally, small unmanned vessels used to clean floating litter on water adopt a paddle wheel as a propulsor to satisfy its shallow-draft requirements; however, this type of propulsor has bulky structures and inefficient propulsion. In this study, a novel tandem paddles propulsor (TPP) was developed, and its propulsion performance was analyzed and compared with that of a paddle wheel propulsor (PWP). Using the RNG <em>k-ε</em> turbulence model and sliding grid technique, the hydrodynamic performance of the PWP was simulated in computational fluid dynamics (CFD) software to verify the reliability of the numerical method. Subsequently, the propulsion performances of the two types of propulsors were simulated with different immersion depths and advanced coefficients, and the differences in their mechanical characteristics and flow field evolution were discussed and compared. The results indicate that the proposed TPP generates 2.75 times more thrust and 1.99 times greater efficiency than the PWP, exhibiting superior propulsion capability in shallow-draft vessels.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 4","pages":"Pages 475-491"},"PeriodicalIF":13.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Run length encoding based weld seam detection from point clouds of ship stiffened panel 基于行程长度编码的船舶加筋板点云焊缝检测

IF 13 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-08-02 DOI: 10.1016/j.joes.2024.07.002

Jun Li , Zhen Chen , Chongben Ni , Puhao Lei

引用次数: 0

On thermoelastic problem based on four theories with the efficiency of the magnetic field and gravity 基于磁场和重力效率四种理论的热弹性问题

IF 13 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2024-08-01 DOI: 10.1016/j.joes.2022.02.007