Ocean Engineering最新文献

Dynamic event trigger adaptive horizon model free robust predictive control for hovercraft heading tracking using interval predictor 利用区间预测器对气垫船航向跟踪进行动态事件触发自适应地平线模型自由鲁棒预测控制

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-18 DOI: 10.1016/j.oceaneng.2024.119602

Weiqiu Zhang, Yujie Xu, Mingyu Fu, Guorong Zhang, Zhipeng Fan

{"title":"Dynamic event trigger adaptive horizon model free robust predictive control for hovercraft heading tracking using interval predictor","authors":"Weiqiu Zhang, Yujie Xu, Mingyu Fu, Guorong Zhang, Zhipeng Fan","doi":"10.1016/j.oceaneng.2024.119602","DOIUrl":"10.1016/j.oceaneng.2024.119602","url":null,"abstract":"<div><div>This paper proposes a new dynamic event trigger adaptive horizon-based interval predictor-model free robust predictive control (IP-MFARPC) method for hovercraft heading tracking control problem without precise modeling under disturbance. Firstly, based on the input-output (I/O) data from the past period, we use partial form dynamic linearization (PFDL) to establish an online data model for the hovercraft, which is more accurate than the compact form dynamic linearization (CFDL) method. Secondly, the proposed method uses interval observers and predictors (IO&IP) to solve the prediction model offline and uses online rolling optimization to solve the optimal control sequence. During the solution process, the offline prediction model is utilized, and LMI is employed to transform robust L2 gain constraints, enhancing the control method's anti-interference ability and the accuracy of the rolling optimization process. Additionally, dynamic event triggering and adaptive prediction step mechanisms are introduced to improve online solving speed without compromising control performance. Finally, simulation results demonstrate that the IP-MFRAPC method effectively tracks the variable heading of the hovercraft under disturbances, offering faster solving times compared to methods without these mechanisms.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119602"},"PeriodicalIF":4.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658686","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

Optimal design of low-speed current energy turbine based on turbine blades with different pitch angles 基于不同桨距角涡轮叶片的低速电流能源涡轮机优化设计

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-18 DOI: 10.1016/j.oceaneng.2024.119488

Guanghao Li , Guoying Wu , Lei Tan , Honggang Fan , Qingrong Kong

引用次数: 0

Experimental study on vortex-induced vibration of rough and smooth risers under variable incident angles arrangement 可变入射角布置下粗糙和光滑立管涡流诱发振动的实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-17 DOI: 10.1016/j.oceaneng.2024.119792

Chao Liu , Zebo Hu , Peng Li , Yu Wang , Zhen Liu , Lianhong Hao , Li Zhu , Yijie Huang

{"title":"Experimental study on vortex-induced vibration of rough and smooth risers under variable incident angles arrangement","authors":"Chao Liu , Zebo Hu , Peng Li , Yu Wang , Zhen Liu , Lianhong Hao , Li Zhu , Yijie Huang","doi":"10.1016/j.oceaneng.2024.119792","DOIUrl":"10.1016/j.oceaneng.2024.119792","url":null,"abstract":"<div><div>The interference effect between adjacent risers in a riser group has been an important research topic for a long time. To investigate the VIV responses of rough and smooth risers in a double riser system, and elucidate the impact of interference effect on rough and smooth risers. VIV experiments were conducted in a flume for rough and smooth risers under variable incident angles. The results indicate that the wake interference has the most significant impact on \"lock-in\" displacement when the roughness of the rough riser is lowest within the sub-critical Reynolds number range. The wake interference effect is more likely to exacerbate the vibration displacement of rough risers in the IL direction as the reduced velocity increases. Furthermore, the smooth riser at an incident angle of 0° is significantly excited by the wake from the rough riser, resulting in an expanded \"lock-in\" region, a shift in the dominant mode, and the excitation of higher-order frequency responses. The displacement response of the smooth riser at an incident angle of 90° is akin to that of an isolated smooth riser.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119792"},"PeriodicalIF":4.6,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658685","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 tsunami impact on offshore box-girder bridges 海啸对近海箱梁桥影响的实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119749

Anhua Yu, Yin Gu, Xiaohe Lai, Xinyi Huang

{"title":"Experimental study on tsunami impact on offshore box-girder bridges","authors":"Anhua Yu, Yin Gu, Xiaohe Lai, Xinyi Huang","doi":"10.1016/j.oceaneng.2024.119749","DOIUrl":"10.1016/j.oceaneng.2024.119749","url":null,"abstract":"<div><div>To investigate the patterns of wave pressure exerted on the superstructure and substructure of offshore box-girder bridges under the influence of tsunamis, a scale model of 1:25 for both the pier-girder and pier model was constructed for tsunami wave impact testing. The study examined pressure and flow field characteristics at various locations on the box girders and piers under different tsunami wave conditions, analyzing the interaction and mechanisms of tsunami impact pressures between the girders and piers, as well as the effect of impact submersion coefficients on these pressures. The findings indicate significant variations in the degree to which different parts of the box girder are affected, with notably higher pressure at the Girder-Pier Connection (GPC) of the girder's bottom compared to other areas, reaching a differential of 16%. Under conditions where the pier is not submerged, the peak pressure at the top of the pier in the pier-girder model was found to be 40% higher than in the pier-only model. Therefore, ignoring the interaction between girders and piers can lead to an underestimation of the pressures caused by tsunami waves. This research is crucial for identifying bridge failure modes and developing mitigation and protection measures.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119749"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658677","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

Time-domain simulation of nonlinear motions of moored floating body in irregular waves using rankine source method 利用秩源法对不规则波浪中系泊浮体的非线性运动进行时域模拟

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119698

Seunghoon Oh , Eun Soo Kim , Jinsoo Park , Byeongwon Park , Sungjun Jung , Min-Guk Seo , Jae Hwan Jung

{"title":"Time-domain simulation of nonlinear motions of moored floating body in irregular waves using rankine source method","authors":"Seunghoon Oh , Eun Soo Kim , Jinsoo Park , Byeongwon Park , Sungjun Jung , Min-Guk Seo , Jae Hwan Jung","doi":"10.1016/j.oceaneng.2024.119698","DOIUrl":"10.1016/j.oceaneng.2024.119698","url":null,"abstract":"<div><div>This study introduces a three-dimensional time-domain Indirect Boundary Integral Equation Method (IBIEM) for simulating the motion of the floating body in both regular and irregular waves. The method systematically addresses second-order wave loads, focusing on low-frequency motions induced by low-frequency wave loads, crucial for the stability of offshore structures. Unlike traditional methods, the time-domain IBIEM simplifies the analysis by simultaneously considering all wave components of irregular waves, making the calculation of nonlinear wave loads more straightforward and intuitive. An approximate second-order equation of motion is proposed, simplifying the computational process by eliminating the need for solving boundary value problems for second-order radiation forces. The IBIEM is coupled with a quasi-static mooring model based on the elastic catenary equation, accurately capturing the influence of mooring systems on the response of the floating body. Validation against model tests and established numerical methods demonstrates the accuracy of the developed code in predicting the dynamic behavior of offshore structures. Applied to various scenarios, including a truncated cylinder, the barge, H2FPSO, and K-Semi, the results show strong agreement with experimental data, confirming the reliability and effectiveness of the method in simulating complex wave-structure interactions, making it a valuable tool for offshore structure design and analysis.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119698"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658681","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

Numerical investigation of the propagation of internal solitary waves and their reflection by a vertical wall based on a fully nonlinear model 基于全非线性模型的内孤波传播及其被垂直墙壁反射的数值研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119776

Yingjie Hu , Xinyu Ma , Li Zou , Zongbing Yu , Jianshi Zhao

{"title":"Numerical investigation of the propagation of internal solitary waves and their reflection by a vertical wall based on a fully nonlinear model","authors":"Yingjie Hu , Xinyu Ma , Li Zou , Zongbing Yu , Jianshi Zhao","doi":"10.1016/j.oceaneng.2024.119776","DOIUrl":"10.1016/j.oceaneng.2024.119776","url":null,"abstract":"<div><div>Propagation of internal solitary waves (ISWs) influenced by typical structures have garnered significant attention. We investigate the propagation of ISWs and their reflection by a vertical wall using multi-domain boundary element method (MDBEM). Fully nonlinear boundary conditions at the interface and free surface conditions at the top surface are considered in the simulations. Meanwhile, laboratory experiments are conducted to validate the constructed numerical model. Wave profiles, resident time, and flow fields for different initial amplitudes and density ratios are calculated and analyzed. Wave amplitudes significantly influence the nonlinear component of wave phase speed. The ratio between the nonlinear speed and the total velocity is only <span><math><mrow><mn>4.5</mn><mo>%</mo></mrow></math></span> for <span><math><mrow><mi>a</mi><mo>/</mo><msub><mi>h</mi><mn>1</mn></msub><mo>=</mo><mn>0.1</mn></mrow></math></span>, but this value can reach <span><math><mrow><mn>32</mn><mo>%</mo></mrow></math></span> for <span><math><mrow><mi>a</mi><mo>/</mo><msub><mi>h</mi><mn>1</mn></msub><mo>=</mo><mn>0.1</mn></mrow></math></span>. The resident time of an ISW attaching to the vertical wall decreases with the increasing initial wave amplitude and reaches a constant value for waves with amplitudes larger than <span><math><mrow><mi>a</mi><mo>/</mo><msub><mi>h</mi><mn>1</mn></msub><mo>=</mo><mn>0.6</mn></mrow></math></span>. Particle velocity in the upper layer is opposite to that in the lower layer, and the vertical velocity becomes dominant as the wave approaches the wall. Surface displacement, presented as a surface solitary wave with an opposite phase induced by an ISW, is obtained and discussed through the numerical model.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119776"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658680","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

Model predictive attitude control of unmanned surface vehicle based on short-time wave prediction 基于短时波预测的无人水面飞行器姿态模型预测控制

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119727

Liang Hong , Haitao Liu , Quanshun Yang , Jiaxuan Yao

{"title":"Model predictive attitude control of unmanned surface vehicle based on short-time wave prediction","authors":"Liang Hong , Haitao Liu , Quanshun Yang , Jiaxuan Yao","doi":"10.1016/j.oceaneng.2024.119727","DOIUrl":"10.1016/j.oceaneng.2024.119727","url":null,"abstract":"<div><div>Unmanned Surface Vehicles (USVs) are widely used in commercial and marine scientific research. In high sea conditions, USV is susceptible to significant random wave disturbances, necessitating the adoption of attitude control mechanisms to ensure safe operation. Existing control algorithms, mostly relying on Proportional Integral and Differential (PID) control and other common methods, tend to concentrate solely on the current model state, and seldom predict the future evolution of the model in combination with the state of the waves. This limitation hinders the optimization of attitude control in rough seas. To address this challenge, this paper proposes a model predictive attitude control approach grounded in Long Short-Term Memory neural network (LSTM) wave forecasting. By forecasting the wave disturbances on the USV in the coming period of time horizon and optimizing maneuvering commands, it identifies the optimal thruster actuation combination. This strategy dynamically adapts to sea conditions in real-time, enhancing the precision and accuracy of attitude control. The stability of this control strategy is validated using the discrete Lyapunov stability criterion. Simulation results demonstrate that our proposed control strategy exhibits remarkable roll and pitch reduction performance, surpassing PID control , linear quadratic regulator (LQR) control, model predictive control (MPC) without disturbance compensation, and MPC with disturbance compensation. Moreover, it maintains a superior control effect even in the presence of state feedback noise, indicating promising application prospects.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119727"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658679","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 of the hydrodynamic and acoustic performance of a Gate Rudder® system over a conventional rudder 门舵®系统相对于传统尾舵的水动力和声学性能实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119742

Ivan Santic, Salvatore Mauro, Mario Felli

{"title":"Experimental Investigation of the hydrodynamic and acoustic performance of a Gate Rudder® system over a conventional rudder","authors":"Ivan Santic, Salvatore Mauro, Mario Felli","doi":"10.1016/j.oceaneng.2024.119742","DOIUrl":"10.1016/j.oceaneng.2024.119742","url":null,"abstract":"<div><div>The Gate Rudder® is a new concept of energy saving device and manoeuvring system, consisting of two asymmetric and independent blades at each side of a propeller which combines the advantage to deliver additional thrust, similar to an accelerating ducted propulsor, and to enhance ship manoeuvrability and seakeeping ability due to the individual control of each rudder blades.</div><div>The present study reports the results of a comprehensive experimental survey in which the hydrodynamic and hydro-acoustic performances of a Gate Rudder® system (GRS) were investigated with respect to a conventional rudder (CRS), for a reference container vessel. The survey, that was conducted in the framework of the EU H2020 Research Project “GATERS”, included detailed flow measurements by 2D-PIV and Stereo-PIV, cavitation tests and acoustic measurements on a scaled model of a target container ship. The tests matrix covered different rudder/rudder-blade angles, speeds and displacements. The study highlights the beneficial effects provided by the installation of a Gate Rudder® over a conventional rudder in terms of sound mitigation and reveals the fundamental underlying hydrodynamic mechanisms of the propeller wake interaction with the Gate Rudder blades under different operative conditions.</div><div>The results provide useful insights on how to improve the hydrodynamic and acoustic performance of a GRS.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119742"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660514","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

Using STPA for hazard identification and comparison of hybrid power and propulsion systems at an early design stage 在早期设计阶段利用 STPA 对混合动力和推进系统进行危险识别和比较

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119752

Anna Sophia Hüllein , Børge Rokseth , Ingrid Bouwer Utne

{"title":"Using STPA for hazard identification and comparison of hybrid power and propulsion systems at an early design stage","authors":"Anna Sophia Hüllein , Børge Rokseth , Ingrid Bouwer Utne","doi":"10.1016/j.oceaneng.2024.119752","DOIUrl":"10.1016/j.oceaneng.2024.119752","url":null,"abstract":"<div><div>The decarbonization of the shipping industry is a hot topic and new emission reduction goals, regulations, and initiatives all over the world underline its importance. These goals apply to the ocean going fleet, as well as coastal shipping and fisheries. Both academia and industry, work on the development and testing of new technologies to reach emission reduction targets. Besides technical feasibility and economic viability, the safety of new power and propulsion systems must be considered in this process. In this paper, the Systems Theoretic Process Analysis (STPA) method is used for hazard identification and comparison of two alternative hybrid power and propulsion systems for a small-scall fishing vessel. The assessment method allows for identifying focus areas for hazard reduction in a systematic manner. System safety requirements derived from the assessment can be considered when designing power and propulsion systems. Based on the results, a discussion of the method and the usefulness of the results is given. The main findings are that the assessment provides valuable insights into the hazards introduced by new power and propulsion systems in a qualitative manner. For a quantification of the risk, further work and an extension of the assessment are needed. The STPA results show that especially the control of the power sources and their interactions internally and externally with the consumer side are crucial. Therefore, special attention should be given to the design of the automated control system, feedback system, and user interaction with the system.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119752"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658682","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

Experimental and numerical investigation of dynamic characteristics and safe mooring criteria of moored outfitting ships under swell conditions 膨胀条件下系泊舾装船的动态特性和安全系泊标准的实验和数值研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.oceaneng.2024.119771

Yunpeng Zhu , Xiaojun Li , Yan Zhu , Ming Wen , Hulin Chen , Xiaotong Yu , Da Chen

{"title":"Experimental and numerical investigation of dynamic characteristics and safe mooring criteria of moored outfitting ships under swell conditions","authors":"Yunpeng Zhu , Xiaojun Li , Yan Zhu , Ming Wen , Hulin Chen , Xiaotong Yu , Da Chen","doi":"10.1016/j.oceaneng.2024.119771","DOIUrl":"10.1016/j.oceaneng.2024.119771","url":null,"abstract":"<div><div>Outfitting ships are characterized by a small draft and a large wind area. As a kind of unpowered ship, when subjected to strong lateral loads, excessive sway motion could cause cable breakage, resulting in potential ship damage or casualties. In this paper, physical and numerical model experiments have been carried out to investigate the effects of swells on moored outfitting ships. The data is analyzed in time and frequency domains to discover the relationship between swells, mooring patterns, ship motions and mooring forces. Subsequently, a numerical model is developed in AQWA, and in conjunction with the physical model experiments, safe mooring criteria for outfitting ships under swell are proposed. Results show that both reducing the sea severity and increasing the number of cables is effective in reducing the risk of cable breakage. The horizontal and heave motions of outfitting ships are controlled by swell period, while the roll and pitch motions are mainly controlled by own parameters. For the cables at different locations, the bow/stern line, breast line and spring line are mainly controlled by sway/yaw motions, sway motion and surge motion, respectively. Additionally, the safe mooring criteria could be widely applied to outfitting quays to ensure the safe operation.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119771"},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658683","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