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International Conference on Artificial Intelligence and Autonomous Transportation, AIAT 2024

作者： Lu, Angqi Zhang, Daiyu Zeng, Daxing Bao, Chaoming Liu, Zhenwei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang212100 China

ISBN: (纸本)9789819639687

To address the heading control problem of Autonomous Underwater Vehicles (AUVs), a PID control parameter optimization method is proposed, which integrates Tabu Search and an improved Particle Swarm Optimization (TPSO) algorithm. Initially, an M-function is employed to construct a simulation model for the AUV. To tackle the issues of overshoot and oscillation caused by step input signals, a reference model is utilized to decompose the input signal for tracking purposes. Subsequently, a PID controller is implemented to regulate the heading angle. Considering the limited local search capability of the Particle Swarm Optimization algorithm during parameter tuning, the Tabu Search algorithm is incorporated into the PSO framework. Simulation experiments demonstrate that the designed control system exhibits excellent performance, achieving rapid and effective control of the heading. This approach holds significant reference value for the underwater motion simulation and application of AUVs. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Particle swarm optimization (PSO)

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Hydrodynamic performance on cavity resonant type floating breakwater for long waves 8

Hydrodynamic performance on cavity resonant type floating br...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Gui, Bin Ji, Chunyan Li, Zhifu Bian, Xiangqian School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

The current work investigates a cavity resonant-type floating breakwater (FB). Therefore, the Helmholtz resonator principle was adopted to reduce the intensity of long-period waves effectively. The configuration of the internal cavity was optimized to resonate with the fluid inside the cavity, thereby dissipating wave energy. Five models with different gap distances (GDs) were analyzed. Various experiments compared the traditional box-type floating breakwater performance with modified floating breakwater models. The experiments were focused on evaluating the transmission coefficient of stationary models under various wave heights and periods. According to the results, the optimized wave attenuation mechanism can effectively overcome the technical defects of the conventional floating breakwater, which limits its application for long-period wave attenuation. Meanwhile, it is found that for a given principal size, the proposed floating breakwater exhibits a 20%-30% smaller transmission coefficient relative to the traditional box-type FB in medium and long-period waves. © Published under licence by IOP Publishing Ltd.

关键词： Wave energy conversion

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Numerical simulation of ice loading characteristics of ships in a wave-current environment in a broken ice area 2

Numerical simulation of ice loading characteristics of ships...

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2023 2nd International Conference on Acoustics, Fluid Mechanics and engineering, AFME 2023

作者： Sun, Rui Li, Zhifu Shi, Yuyun School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

A numerical simulation technique with CFD-DEM coupling is used to simulate a full-scale KCS model sailing in the pancake ice region. Based on the actual polar information, the Stokes fifth-order wave model is selected. The pancake ice particle of two scales is established based on the DEM, and the corresponding broken-ice region is generated. The contact and collision problems of ice-ice and ice-wall (ship) were analyzed by solving the Hertz-Mindlin model, and the monitored data were processed and summarized. The results show that the ice load on the ship is a repetitive "loading-unloading"process, and the peak ice load curve is characterized by segmented and concentrated fluctuations. In terms of ice parameters, the pancake diameter has a great degree of influence on the crushed ice loads, and the size of the crushed ice loads increases with the diameter of the crushed ice particles. © Published under licence by IOP Publishing Ltd.

关键词： Ice

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Analysis and research on the hydrodynamic performance of offshore floating photovoltaic systems under large tidal variations 8

Analysis and research on the hydrodynamic performance of off...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Gao, Xubing Guo, Jianting School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

This paper focuses on the multi-module connected offshore floating photovoltaic system, designing a mooring system with buoys, considering the effects of buoy size, position on the motion response of the photovoltaic system, mooring cable tension, and photovoltaic air gap. Based on the three-dimensional potential flow theory, optimal parameters for buoys were selected using regular waves at an average depth of 10 meters. Subsequently, factors such as tidal differences, randomness of waves, wind, and currents were taken into account, and the motion response, mooring tension, and photovoltaic air gap were calculated separately at water depths of 8 m, 10 m, and 12 m. The analysis results indicate that the offshore floating photovoltaic system with a buoy mooring system, under the influence of tidal differences, does not show significant differences in the minimum air-gap height of the photovoltaic system, ensuring safe and stable operation. © Published under licence by IOP Publishing Ltd.

关键词： Mooring

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Floating body motion coupling study and economic evaluation of different floating photovoltaic arrangement schemes under hybrid solar-wind power generation 8

Floating body motion coupling study and economic evaluation ...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Lin, Feiyan Li, Na School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

Reducing the number of anchor points and moorings for floating platforms is one of the ways to reduce the integration and maintenance costs of floating offshore wind and solar farms. This paper focuses on the technical feasibility and economic viability of reducing the number of anchor points and moorings for floating offshore PV platforms by using a monopile of a stationary wind turbine as a mooring anchor point and introducing a shared line system. In this paper, three different floating solar layouts and their corresponding mooring systems are numerically evaluated and optimized under different environmental loading conditions using the commercial software OrcaFlex. The results of the study show that the implementation of a shared mooring solution maximizes the cost-effectiveness economically while technically ensuring stable operation. © Published under licence by IOP Publishing Ltd.

关键词： Mooring

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A comprehensive comparison study between Deep Operator networks neural network and long short-term memory for very short-term prediction of ship motion

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Journal of Hydrodynamics 2024年第6期36卷 1167-1180页

作者： Yong Zhao Jin-xiu Zhao Zi-zhong Wang Si-nan Lu Li Zou College of Naval Architecture and Ocean Engineering Dalian Maritime UniversityDalian116026China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China School of Naval Architecture and Ocean Engineering Dalian University of TechnologyDalian116024China

Very short-term prediction of ship motion is critically important in many scenarios such as carrier aircraft landings and marine engineering *** paper introduces the newly developed functional deep learning model,named as Deep Operator networks neural network(DeepOnet)to predict very short-term ship motion in *** takes wave height as input and predicts ship motion as output,employing a cause-to-effect prediction *** modeling data for this study is derived from publicly available experimental data at the Iowa Institute of Hydraulic ***,the tuning of the hyperparameters within the neural network system was conducted to identify the optimal parameter ***,the DeepOnet model for wave height and multi-degree-of-freedom motion was established,and the impact of increasing time steps on prediction accuracy was ***,a comparative analysis was performed between the DeepOnet model and the classical time series model,long short-term memory(LSTM).It was observed that the DeepOnet model exhibited a tenfold improvement in accuracy for roll and heave ***,as the forecast duration increased,the advantage of the DeepOnet model showed a trend of *** a functional prediction model,DeepOnet offers a novel and promising tool for very short-term ship motion prediction.

关键词： DeepOnet very short-term prediction hyperparameters tuning functional prediction model long short-term memory(LSTM)

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Research on the response of underwater explosion side structure based on RKPM method 8

Research on the response of underwater explosion side struct...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Zhao, Chuanqi Chen, Xin Cui, Jie School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China School of Materials Science and Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

Based on smoothed particle hydrodynamics and reproducing kernel particle method, this paper establishes a fluid-structure interaction three-dimensional calculation model for the dynamic response of complex structures to underwater explosion shockwave, verifies the effectiveness, accuracy and progressiveness of SPH-RKPM coupling calculation, and establishes a control condition with detonation distance as a variable to determine the dynamic response characteristics of ship side under shockwave loads generated by underwater explosion at different detonation distances. © Published under licence by IOP Publishing Ltd.

关键词： Detonation

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Rapider-YOLOv7: Lightweight Infrared Object Detection Network 7

Rapider-YOLOv7: Lightweight Infrared Object Detection Networ...

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7th International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2024

作者： Xu, Pucheng Yu, Yuecheng Zou, Rundong Shi, Jinlong Li, Yongzheng School of Computer Science Jiangsu University of Science and Technology Zhenjiang China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

ISBN: (纸本)9798350350890

YOLOv7-tiny, as a lightweight variant of YOLOv7, boasts advantages of fast runtime and fewer parameters. However, when directly applied to infrared object detection, YOLOv7-tiny still faces challenges such as weak extraction of fine details, loss of semantic information, and high resource consumption. To address these issues, we propose a comprehensive balance between detection speed and accuracy in the Rapider-YOLOv7 object detection network. Firstly, it introduces the Exponential Spatial Pyramid Pooling with Channel Spatial Pyramid (Soft-SPPCSP) module to enhance the capability of the original model in extracting low contrast information from infrared images. Secondly, it designs the FO-CA attention module to strengthen the model's feature extraction capability for infrared images with weak textures. Furthermore, it devises the lightweight SFaster-net network, which incorporates SPDconv convolution for feature extraction to accelerate the model's feature extraction speed and enhance its capability to extract features from low-resolution images. Experimental results on the FLIR-v2 infrared dataset demonstrate that the mAP of the Rapider-YOLOv7 model reaches 62.6%, which is 2.9% higher than that of the original YOLOv7-tiny. Moreover, the FPS value on the RTX4060ti reaches 93. © 2024 IEEE.

关键词： Infrared imaging

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Under the Blast Impact Load Study of Analytical Prediction Method for Plastic Response of Stiffened Plate 29th

Under the Blast Impact Load Study of Analytical Prediction M...

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29th International Conference on Computational and Experimental engineering and sciences, ICCES 2023

作者： Huang, TianBo Zong, Shuai Liu, Kun Wang, JiaXia Gao, ZhenGuo School of Naval Architecture and Ocean Engineering Jiang Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

ISBN: (纸本)9783031429866

In this paper, a steel stiffened plate is used as the research object and its blast response under the action of air blast load is simulated and studied. Assuming that the deformation mode of the dynamic response of the reinforced plate is the same as the static limit deformation mode, the energy principle and the plastic deformation principle of the reinforced plate structure are used to analyze and obtain the motion control equations of its plastic dynamic response under the action of the blast impact load. Meanwhile, the simulation analysis of the stiffened plate under the air blast load is carried out using the finite element software ABAQUS, and the deformation theory of the reinforced plate structure is verified according to the simulation analysis results. It provides a reference for the design and impact resistance evaluation of steel stiffened plates. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Plastic deformation

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Study on the dynamic characteristics of rising bubbles under the influence of viscosity based on VOF method 8

Study on the dynamic characteristics of rising bubbles under...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Qin, Zikai Li, Mingyuan Chen, Xin Cui, Jie School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang212003 China

In order to study the buoyancy-driven rising bubbles in liquids in various types of problems such as oil pipeline transportation, combustible ice mining, ship drag reduction, and the use of bubbles to deliver drugs in blood, this paper establishes a model for the rising bubbles in liquids based on the Volume of Fluid Function (VOF) method, and investigates the change rule of the larger-size bubbles under the influence of viscosity in different viscous silicone oils. It provides theoretical and technical support for various natural and industrial processes such as deep-sea oil extraction and metal smelting. © Published under licence by IOP Publishing Ltd.

关键词： Ice problems

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