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Ocean Engineering
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#1Zhenfeng Zhai (SYSU: Sun Yat-sen University)
#2Hua Huang (SYSU: Sun Yat-sen University)
Last. Sen Liu (SYSU: Sun Yat-sen University)
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Abstract The interaction between cnoidal waves and a concentric cylindrical structure with an arc-shaped outer wall has been investigated theoretically using eigenfunction expansion approach. The arc-shaped outer cylinder is permeable and thin, protecting the porous dual-cylinder structure. Three cylinders are surface-piercing and rigidly installed on the flat bottom of an ocean. Analytical solutions were obtained based on the first approximation to cnoidal waves. A series of linear equations pe...
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#2Mirosław Gerigk (GUT: Gdańsk University of Technology)H-Index: 4
Abstract The paper presents the results of experimental study on the interaction between the bow thrusters understood as the flow field changes generated by bow tunnel thruster in deep water conditions operated as a single and twin units. The research was limited to zero-speed case for the ship dead in the water. The influence of the hull form and jet spread between the neighbouring thrusters for several combinations of the applied bow thruster propeller revolutions has been discussed. The resul...
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#1Lu Liu (Dalian Maritime University)
#2Weidong Zhang (SJTU: Shanghai Jiao Tong University)H-Index: 24
Last. Zhouhua Peng (Dalian Maritime University)H-Index: 25
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Abstract This paper presents a resource-aware state and uncertainty estimation method for dynamic positioning vessels subject to uncertain kinetics and unknown sea loads induced by wind, waves and currents. Specifically, an event-triggered extended state observer (ESO) is proposed such that unnecessary communications are avoided and sensor-to-observer communication cost are drastically reduced. A realizable event-triggering condition is established depending on the position-heading measurements ...
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#1Haibo Gao (WUT: Wuhan University of Technology)
#2Linhao Liao (WUT: Wuhan University of Technology)
Last. Xiaojian Xu (Hangzhou Dianzi University)
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Abstract Marine propeller ventilation, which can occur in extreme seas, reduces energy efficiency of the ship, and can result in significant safety hazards during navigation. A major maritime challenge is to predict water levels during extreme seas and manage an appropriate control strategy for the propulsion system with fast response times. Here we report application of an evidence reasoning (ER) rule-based Adaboost.M1 approach to rapidly estimate propeller ventilation levels thereby improving ...
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#1Wenbo Tu (ECJTU: East China Jiaotong University)
#2Maosong Huang (Tongji University)H-Index: 17
Last. Zonghui Liu (Xida: Guangxi University)
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Abstract As a deep-water foundation, composite caisson-pile foundation (CCPF) is usually subjected to horizontal dynamic loads and moments due to the complicated marine environment. In this study, model tests were performed on three different types of deep-water foundation, including caisson, caisson with four piles and eight piles to investigate their lateral nonlinear dynamic characteristics under various excitation forces. Meanwhile, the effect of scour depth on the dynamic response of the fo...
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Abstract This work examines the steady-state potential and feasibility of Yaw and Induction-based Turbine Repositioning (YITuR), which is a wind farm control concept that passively repositions floating offshore wind turbines using existing turbine control degrees of freedom. To this end, the Floating Offshore Wind Farm Simulator (FOWFSim) is developed to model steady-state wind farm power production while considering floating platform relocation. Optimization studies are carried out with differe...
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#1Behrooz Tafazzoli Moghaddam (Cranfield University)
#2Ali Mahboob Hamedany (Cranfield University)
Last. Kamran Nikbin (Imperial College London)H-Index: 25
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Abstract Floating offshore wind turbines are becoming more attractive to the wind industry due to their capability to operate larger turbines in deeper waters. The floating support structures are anchored to the seabed via mooring chains to impede the structure's unwanted movements. The combination of cyclic stresses and the corrosive marine environment makes the floating support structures vulnerable to corrosion pitting and subsequently fatigue crack initiation and propagation. In this study a...
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#1Junlei Wang (Zhengzhou University)H-Index: 8
#2Zhen Su (Zhengzhou University)
Last. Oleg Gaidai (Jiangsu University)H-Index: 7
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Abstract The performance of an Aquatic Clean Energy Harvester (ACEH) under the wake interferences of different arranged stationary cylinders is numerically studied. Nine wake interferences are generated by varying the transverse distance between the two stationary interfering cylinders (SIC) and the streamwise distance between SIC and the Energy harvesting Cylinder (EHC). The mass ratio, damping and spring stiffness of the ACEH are set as 1.6674, 2.7274 N s/m and 758.11 N/m, respectively. The wa...
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Maritime transport has strived to reduce accidents and their consequences since its origins, by addressing safety as the priority from the design stage to decommissioning of any vessel. Complex nature of accidents, where numerous factors combine in a complicated structure, in turn, makes accidental learning ineffective. Statistical analysis of past experiences in maritime is good for demonstrating the trends for certain contributing factors in accidents. However, there is a lack of a detailed te...
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#1Momchil TerzievH-Index: 1
#2Tahsin TezdoganH-Index: 8
Last. Atilla IncecikH-Index: 19
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The increasing relevance of simulation-based design has created a need to accurately estimate and bind numerical errors. This is particularly relevant to full-scale computational ship hydrodynamics, where measurements are difficult and expensive, simultaneously requiring a high degree of predictive accuracy even in early design stages. However, the field of ship hydrodynamics has yet to fully exploit the enhanced capabilities and potential benefits numerical verification methods have to offer. T...
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