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33rd International ocean and Polar engineering Conference, ISOPE 2023

作者： Shang, Baoyou Li, Tianyun Zhu, Xiang Wang, Jianing School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan China Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Shanghai China Hubei Key Lab of Naval Architecture Ocean Engineering Hydrodynamics Wuhan China

ISBN: (纸本)9781880653807

Propulsion shafting is an important part of the ship, its vibration characteristics directly affect the operating state of the ship. This paper combines the grey system theory with the neural network model to prediction propulsion shafting vibration characteristics. The initial data set for neural network was generated by changing the bearing installation height in the shafting finite element model. Research shows that the grey system can effectively reduce the training time of shafting neural network model, and more accurately predict the transverse vibration of propulsion shafting. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Vibration analysis

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Analysis of hydrodynamic performance of a gate rudder propeller system 34th

Analysis of hydrodynamic performance of a gate rudder propel...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Zhang, Jiang-Ping He, Wei Li, Ziru Key Laboratory of High Performance Ship Technology Wuhan University of Technology Ministry of Education China Departments of Naval Architecture Ocean and Structural Engineering School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Province Wuhan China

ISBN: (纸本)9781880653784

The open-water performance of the gate rudder propulsion system is compared with that of the conventional rudder system by numerical simulations based on RANS method. The total drag of the installed gate rudder system is lower than that of the conventional rudder system. The influence of the radial distance between the gate rudder and the propeller is also analyzed, indicating that the open-water efficiency can be improved about 4% when the distance is 1.15R. The gate rudder system in maneuvering is finally simulated. It shows that the gate rudder can produce more transverse force in the turning mode (-30°/+35°). © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Rudders

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Numerical study on the effect of sill height of ball-and-sill combination deflector cap on the open-water characteristics of pump-jet propulsor 34th

Numerical study on the effect of sill height of ball-and-sil...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Zhang, Feng He, Wei Li, Zi-Ru Liu, Qian Key Laboratory of High Performance Ship Technology Wuhan University of Technology Ministry of Education China Departments of Naval Architecture Ocean and Structural Engineering School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Province Wuhan China

ISBN: (纸本)9781880653784

A ball-and-sill combined deflector cap is designed to reduce the influence of the front end of the hub on the incoming flow, which can make the incoming flow closer to the fluid flow behind the underwater vehicle. The open-water characteristics of the pump-jet propulsor with deflector caps of different ball-and-sill geometry are examined at different incoming flow velocity by using the RANS method with the SST k-ω turbulence model. The results indicate that the open-water characteristics of the pump-jet propulsor with a sill height of 0.5D is closest to those of the pump-jet propulsor behind the vehicle. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Navier Stokes equations

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Effects of Reynolds Number on Open-water and Self-propulsion Performance of Propeller with Short Chord Length 34th

Effects of Reynolds Number on Open-water and Self-propulsion...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Li, Jingyu He, Wei Li, Ziru Key Laboratory of High Performance Ship Technology Wuhan University of Technology Ministry of Education China Departments of Naval Architecture Ocean and Structural Engineering School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Province Wuhan China

ISBN: (纸本)9781880653784

The effects of Reynolds number on open-water and self-propulsion performance of a propeller with short chord length are investigated by numerical and experimental methods in the present work. Numerical studies are carried out using the RANS solver together with the γ-Reθ model. Results show that KT increases and KQ decreases with increasing Re in open-water conditions, while complex flow involving laminar, turbulent, transition and flow separation is captured around propeller. Predicted ηr shows an unexpected decrease when Reopt > Rec, but when the open-water performance diagram with low Reopt is applied, it will increase due to the similarity of the flow state in open-water and self-propulsion conditions. Finally, recommendations for the propulsion factors calculation procedure are proposed. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Reynolds number

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Load forecasting of port multi-energy fusion power system based on improved FFT and ConvMLP-GRU

Load forecasting of port multi-energy fusion power system ba...

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2024 International Conference on Advanced Control Systems and Automation Technologies, ACSAT 2024

作者： Zhou, Dianqiang Tang, Xujing Guo, Wei Wang, Tian Wuhan University of Technology School of Naval Architecture Ocean and Energy Power Engineering Hubei China Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Hubei China

ISBN: (纸本)9798331541668

Accurate electrical load prediction is essential for the stable operation of multi-energy fusion power systems at ports, which integrate wind and solar energy. To address the challenges of low prediction accuracy for long sequences, stemming from disordered port load data and insufficient semantic information, this paper proposes a load power forecasting method based on an improved FFT and ConvMLP-GRU. The Hanning window function is employed to optimize the FFT process, thereby reducing spectral leakage and endpoint effects. The top k amplitudes and their corresponding frequencies are extracted to compute the data period, allowing for the decomposition of the original load data into a two-dimensional tensor. ConvMLP is then utilized to extract features both within and between data periods, while GRU are employed for load prediction. Experimental results using load data from the port of Ningbo demonstrate that the proposed method enhances short-term prediction accuracy and reduces prediction errors for long sequences when compared to classical deep learning models. © 2024 IEEE.

关键词： Fast Fourier transforms

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Tsunamis and tsunami warning:Recent progress and future prospects

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Science China Earth Sciences 2021年第2期64卷 191-204页

作者： Chao AN Key Laboratory of Hydrodynamics(Ministry of Education) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Tsunamis are one of the most destructive disasters in the *** tsunamis are mostly generated by earthquakes,and they can propagate across the ocean without significantly losing *** the shoaling process in coastal areas,the wave amplitude increases dramatically,causing severe life loss and property *** have been frequent tsunamis since the 21 st century,drawing the attention of many countries on the study of tsunami mechanism and *** records also play an essential role in deriving earthquake rupture models in subduction *** paper reviews the recent progress and limitations of tsunami research,from the aspects of tsunami generation,propagation,inversion and *** tsunami warning strategies are discussed and future prospects on tsunami research are provided.

关键词： Tsunamis Tsunami warning Tsunami inversion Subduction earthquakes Tsunami simulation

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Transverse vibration characteristics of rectangular thin plates with moving point supports 33rd

Transverse vibration characteristics of rectangular thin pla...

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33rd International ocean and Polar engineering Conference, ISOPE 2023

作者： Zeng, Yang Shi, Zifeng Song, Junjie Yin, Caiyu Liu, Jingxi School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory of Naval Architecture and Ocean Hydrodynamics Wuhan China Yichang Testing Technique R&D Institute YiChang China Wuhan Marine Machinery Plant Co. Ltd. Wuhan China

ISBN: (纸本)9781880653807

In this paper, based on Rayleigh-Ritz theory, the transverse vibration characteristics of rectangular plates with point supports at different positions are studied. Based on Hamilton energy principle and combined with the constraints of boundary and point support, the lateral vibration equation of rectangular plate considering point support is established, and the free vibration frequency and mode of rectangular plate are solved. The effectiveness and reliability of the proposed method are verified by comparing the calculated results with literature and finite results. Finally, the vibration characteristics of rectangular plates with different length-width ratios at different support positions are analyzed. The analysis shows that the change of support positions has a significant effect on the vibration frequency of rectangular plates. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Rectangular plate

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Research on Optimal Scheduling of Multi-Energy Integrated Port Power System Based on NSGA II 5

Research on Optimal Scheduling of Multi-Energy Integrated Po...

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5th International Conference on Clean Energy and Electric Power engineering, ICCEPE 2024

作者： Guo, Wei Wu, Hang Xu, Li Tang, Xujing Zhou, Dianqiang Huang, Weijie Li, Wenlong School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei China State Key Laboratory of Maritime Technology and Safety Wuhan University of Technology Hubei China Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Hubei China

ISBN: (纸本)9798350390315

As a pivotal logistics hub for land and water transportation, ports exhibit substantial energy consumption. In light of the global emphasis on green emission reduction and China's 'Double Carbon' strategy, the conventional energy structure falls short in meeting the demands of port production and development due to its high pollution emissions. Consequently, an imperative shift is required in their energy supply structure. Given the inherent geographical conditions and operational environment of port areas, there exists significant potential for harnessing clean energies such as wind power and solar radiation locally, thereby offering distinct advantages through multi-energy conversion and application. The underlying coordination control strategy was specifically designed in this study, taking into account the characteristics of the new energy power generation system, energy storage system, and flexible DC interconnection system of the target port area. Furthermore, an optimal scheduling model was constructed by integrating the objective function and constraint conditions with a focus on achieving optimal economy while minimizing dependence on external power grid. To solve this model effectively, a combination of NSGA II and TOPSIS algorithms was employed. Additionally, two-stage multi-time scale optimization scheduling based on typical days was conducted to validate the feasibility of the proposed strategy and provide data support for implementing the demonstration project. © 2024 IEEE.

关键词： Wind power integration

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CFD simulations targeting the performance of the NTNU BT1 wind turbine using overset grids

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Journal of hydrodynamics 2023年第5期35卷 954-962页

作者： Mao-kun Ye Ni-na Wang Hamn-Ching Chen De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Huadong Engineering Corporation LimitedHangzhou310014China Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTexasUSA

In the present study, the performance of the NTNU Blind Test 1 wind turbine is analyzed in the computational fluid dynamics (CFD) simulations by using the CFD code FANS with structured overset grids. First, the numerical methods including the governing equations, the turbulence closure model, and the flow solver are introduced. In addition, the NTNU BT1 wind tunnel experiment is described. Then, structured overset grid blocks are generated in the computational domain with fully resolved wind turbine geometry, including the blades, hub, nacelle, and tower. Afterward, unsteady Reynolds averaged Navier-Stokes (RANS) simulations with the two-layer k - ε turbulence model are performed with an inlet velocity of 10 m/s and a tip-speed ratio (TSR) of 6. The overset-grid capability of FANS is leveraged to handle the rotation of the rotor. Finally, simulations are performed for a range of TSRs and a comparison is made among the present CFD results, other numerical results obtained from representative methods, and the experimental data. It is observed that the CFD-predicted thrust coefficients match the experimental measurement at low TSRs while under-predicting the values at high TSRs, and potential reasons for this deviation are discussed.

关键词： Wind turbine performance computational fluid dynamics(CFD) overset grids

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Research on the Open-Water Performance and Tip-Vortex of Toroidal Propeller 34th

Research on the Open-Water Performance and Tip-Vortex of Tor...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Tang, Zixuan He, Wei Li, Ziru Key Laboratory of High Performance Ship Technology Wuhan University of Technology Ministry of Education China School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Hubei Province Wuhan China

ISBN: (纸本)9781880653784

A toroidal propeller is an advanced propulsive system, which is composed of toroidal closed blades and a hub. The open-water performance of the toroidal propeller is numerically simulated in order to examine the influence of the front and aft blades on the tip vortex and wake field of the toroidal propeller by using the RANS method together with the adaptive mesh refinement algorithm. It observes that the tip vortex fusion and separation are delayed with the increase of the advance coefficient. The front and aft blades influence the tip vortex structure at the upstream and downstream of toroidal propeller, respectively. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Propellers

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