检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

Experimental study on bubble pulsation characteristics close to the fixed surface with multiple air bubbles attached 34th

Experimental study on bubble pulsation characteristics close...

引用

34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Wu, Shizeng Wang, Jiaxia Liu, Kun Jiang, Mingzuo School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu China College of Automation Jiangsu University of Science and Technology Zhenjiang Jiangsu China

ISBN: (纸本)9781880653784

The interaction between multi-cavitation dynamics is a common phenomenon of interest in natural and industrial applications, such as hydraulic engineering, medical fields and military fields. The nonspherical oscillating bubble and air bubble shapes, various kinds of bubble jetting directions, and the pressure counters on the solid surface induced by the oscillating bubble are the basis of the multi-bubbles interaction research. The coupling characteristics of an underwater oscillating bubble, induced by a low-voltage spark-discharge setup, near two air bubbles of the similar size attached to the surface of a fixed structure were experimentally investigated by high-speed photography. The coupling pulsation effect between two air bubbles and underwater pulsating bubbles under various dimensionless distance parameters was focused on. A variety of interesting and complex bubble and air bubble patterns were observed in the experiment, such as multi-direction bubble jet, downward bubble jet, bubble tearing, opposite jet of two air bubbles and inclined L-shaped air bubble. In order to get better understanding of the coupling interaction between three bubbles, the quantitative analysis of parameters such as distance parameters can provide some reference for the coupling characteristics of multiple bubbles. The results show that when the pulsating bubble is directly below one attached air bubble, the oscillating bubble produces an inclined jet under the loading of the other air bubble. The finding highlights prospects in the area on cavitation erosion reduction and utilization of cavitation through multiple air bubble. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： High speed photography

来源：评论

学校读者我要写书评

暂无评论

Hydrodynamic Response Analysis of the Combined IEA-15-240-RWT and UMaine VolturnUS-S System to Extreme Loading 33rd

Hydrodynamic Response Analysis of the Combined IEA-15-240-RW...

引用

33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Cui, Fuyin Chen, Shuling Wang, Wei Zhuo, Yueyue Li, Yang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu China

ISBN: (纸本)9781880653807

In the development of offshore wind energy resources, the basic hydrodynamic performance analysis of FOWT plays a crucial role for evaluating its adaptability to the marine environment and operational reliability. This paper provides numerical contribution to the comparative study conducted in the ISOPE 2023 regarding the limit load of FOWT in complex environment, by using the commercial software STAR-CCM+, the first-order linear superposition method will be used to establish the focused wave model to simulate the transient wave load. After being validated using the experimental data, a further investigation on the response of FOWT under transient excitation will be carried out. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Hydrodynamics

来源：评论

学校读者我要写书评

暂无评论

Path Tracking of Unmanned Surface Vehicle Based on Improved Adaptive Sliding Mode Control Algorithm 3

Path Tracking of Unmanned Surface Vehicle Based on Improved ...

引用

3rd International Conference on Control and Intelligent Robotics, ICCIR 2023

作者： Liu, Mengge Kong, Linghai Cheng, Chen Li, Yongzheng School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu China

ISBN: (纸本)9781510671867

Aiming at the path tracking problem of unmanned surface vehicle, a sliding mode control algorithm enhanced with adaptive control technology is proposed. Adaptive control technology is used to predict the boundary value of unknown external environment interference. In order to improve the robustness of the system and the convergence rate of path tracking, the optimization algorithm is designed based on the hyperbolic tangent function control reaching law. A new double power combination function is proposed as the control law to design the sliding mode control algorithm to control the forward and steering of unmanned surface vehicle. The chattering phenomenon caused by sliding mode control is solved effectively and the convergence speed of path tracking is improved. The curve fitting method is utilized to realize the effective tracking of any planned flight path. The simulation results demonstrate that the proposed adaptive sliding mode control algorithm is able to ensure unmanned surface vehicle track the upper reference path accurately under the time-varying disturbance of wind, waves and currents. In additional, the adaptive sliding mode control algorithm embedded an approach control law, called new double power function, is confirmed that has strong robustness and fast convergence rate of path tracking. © 2023 SPIE.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

Research on Grid Division Strategy of Ship Resistance Calculation in Calm Water 24

Research on Grid Division Strategy of Ship Resistance Calcul...

引用

4th International Conference on Artificial Intelligence, Big Data and Algorithms, CAIBDA 2024

作者： Wei, Qi Gu, Jiayang Tao, Yanwu Hu, Fangxin School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu China Marine Equipment and Technology Institute Jiangsu University of Science and Technology Zhenjiang Jiangsu China

ISBN: (纸本)9798400710247

Calm water resistance of ship is an important index of ship design and performance evaluation, which has an extremely important impact on ship operation capacity, fuel consumption, speed and navigation stability. In order to accurately predict the calm water resistance of the hull, this research investigates the detailed analysis process of hull resistance in calm water using the commercial computational fluid dynamics software STAR-CCM+. The extremely large oil tanker KVLCC2, the container ship KCS, and the navy destroyer DTMB5415's resistance values at various speeds are computed, accordingly, by the use of a sensible meshing approach. In this study, the model test results and the numerical resistance prediction findings based on the grid division are compared. The maximum difference between the results of the numerical simulation and the results of the model test is kept to a maximum of 5%, and the average error is kept to a minimum of 2%. The agreement between the resistance predictions from the numerical simulation and the model test demonstrates the accuracy and dependability of the meshing procedure used in this study and serves as a guide for calculating resistance for the majority of ships operating in calm water. © 2024 Copyright held by the owner/author(s).

关键词： Warships

来源：评论

学校读者我要写书评

暂无评论

An efficient and accurate numerical method for simulating close-range blast loads of cylindrical charges based on neural network

引用

Defence technology(防务技术) 2025年第2期44卷 257-271页

作者： Ting Liu Changhai Chen Han Li Yaowen Yu Yuansheng Cheng School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan 430074China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

To address the problems of low accuracy by the CONWEP model and poor efficiency by the Coupled Eulerian-Lagrangian(CEL)method in predicting close-range air blast loads of cylindrical charges,a neural network-based simulation(NNS)method with higher accuracy and better efficiency was *** NNS method consisted of three main ***,the parameters of blast loads,including the peak pressures and impulses of cylindrical charges with different aspect ratios(L/D)at different stand-off distances and incident angles were obtained by two-dimensional numerical ***,incident shape factors of cylindrical charges with arbitrary aspect ratios were predicted by a neural ***,reflected shape factors were derived and implemented into the subroutine of the ABAQUS code to modify the CONWEP model,including modifications of impulse and *** reliability of the proposed NNS method was verified by related experimental *** accuracy improvement was acquired by the proposed NNS method compared with the unmodified CONWEP ***,huge efficiency superiority was obtained by the proposed NNS method compared with the CEL *** proposed NNS method showed good accuracy when the scaled distance was greater than 0.2 m/kg^(1/3).It should be noted that there is no need to generate a new dataset again since the blast loads satisfy the similarity law,and the proposed NNS method can be directly used to simulate the blast loads generated by different cylindrical *** proposed NNS method with high efficiency and accuracy can be used as an effective method to analyze the dynamic response of structures under blast loads,and it has significant application prospects in designing protective structures.

关键词： Close-range air blast load Cylindrical charge Numerical method Neural network CEL method CONWEP model

来源：评论

学校读者我要写书评

暂无评论

Structural Strength Study of A Floating Wind Turbine Under Freak Waves Through the CFD-FEA Method

引用

China Ocean engineering 2024年第6期38卷 943-957页

作者： HUO Fa-li LUO Pinga NIE Yan ZHAO Yu-peng LI Ming-yang XU Sheng School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Shanghai Investigation Design&Research Institute Co.Ltd.Shanghai 200435China Shandong Xinneng Shipbuilding Co Jining 273500China College of Oceanography Jiangsu University of Science and TechnologyZhenjiang 212100China

In recent years,the exploitation of offshore wind resources has been attached with greater *** a result,semi-submersible floating wind turbines(FWTs)have gradually become a popular research topic,with the structural strength being a research hotspot as it can ensure the safe operation of *** severe sea conditions of freak waves result in enormous wave heights,extremely fast wave speeds,and concentrated ***,it is difficult to accurately simulate these effects on the loads of floating wind turbines using the potential flow theory and other *** this paper,the structural strength of a floating wind turbine under the action of freak waves is analyzed based on the CFD-FEA coupled *** effects of the mooring system and the wind load are considered in the time domain,and the CFD method is applied to analyze the wave load of the floating wind turbine under the extreme sea state of freak *** strength and motion of the floating wind turbine float structure are analyzed by combining the CFD method and the FEA method,and the analytical results of the mutual transfer of these two methods are taken as the initial quantities for further *** accuracy of the analytical model of the CFD-FEA method is verified by the results of the tank test analysis,and the structural strength analysis under freak wave conditions is carried out for a new type of floating wind *** results of this research provide useful guidance and references for the design and engineering applications of offshore floating wind turbines.

关键词： floating wind turbines(FWTs) freak waves CFD-FEA coupled method structural strength

来源：评论

学校读者我要写书评

暂无评论

Design and Overall Strength Analysis of Multi-Functional Elastic Connections Floating Breakwater System

引用

Journal of Shanghai Jiaotong university(science) 2022年第3期27卷 326-338页

作者： HUO Fali YANG Hongkun GUO Jianting JI Chunyan NIU Jianjie WANG Ke School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212028JiangsuChina

As a new type of marine structure,floating breakwater can provide suitable water area for coastal *** this paper,a multi-module floating breakwater with three cylinders was *** to the characteristics of each module,the elastic connector was *** cabins with functions such as living,generating electricity and entertainment were arranged.A linear spring constrained design wave(LSCDW)method for strength analysis of floating marine structures with multi-module elastic connections was *** numerical model was verified by 1:50 similarity ratio in the test *** to the analysis of design wave and extreme wave conditions,considering the mooring loads and environmental loads and connector loads,the overall strength of breakwater was analyzed by LSCDW *** studies can provide new insights and theoretical guidance for the design of multi-module floating structures.

关键词： floating breakwater elastic connection linear spring constrained design wave(LSCDW)method overall strength analysis

来源：评论

学校读者我要写书评

暂无评论

Electro-mechanical coupling properties of band gaps in an with periodically attached “spring-mass” resonators

引用

Applied Mathematics(A Journal of Chinese Universities) 2023年第3期38卷 429-443页

作者： ZHANG Jian QIAN Deng-hui REN Long WANG Qi School of Naval Architecture&Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China China Nanhu Academy of Electronics and Information Technology Jiaxing 314000China

The model of a locally resonant (LR) epoxy/PZT-4 phononic crystal (PC)nanobeam with “spring-mass” resonators periodically attached to epoxy is proposed. The corresponding band structures are calculated by coupling Euler beam theory, nonlocal piezoelectricity theory and plane wave expansion (PWE) method. Three complete band gaps with the widest total width less than 10GHz can be formed in the proposed nanobeam by comprehensively comparing the band structures of three kinds of LR PC nanobeams with resonators attached or not. Furthermore, influencing rules of the coupling fields between electricity and mechanics,“spring-mass” resonator, nonlocal effect and different geometric parameters on the first three band gaps are discussed and summarized. All the investigations are expected to be applied to realize the active control of vibration in the region of ultrahigh frequency.

关键词： phononic crystal nanobeam electro-mechanical coupling effect nonlocal effect locally resonant mechanism

来源：评论

学校读者我要写书评

暂无评论

A Gradient Alignment Federated Domain Generalization Framework for Rotating Machinery Fault Diagnosis

引用

IEEE Internet of Things Journal 2025年第13期12卷 24764-24774页

作者： Ye, Zongzhen Wu, Jun He, Xuesong Jiang, Weixiong Huazhong University of Science and Technology School of Naval Architecture and Ocean Engineering Wuhan430074 China Hanjiang Laboratory Wuhan430064 China

Empowered by the huge amounts of sensor data in Industrial Internet of Things (IIOT), deep learning models have made remarkable achievements in the field of rotating machinery fault diagnosis. To improve the diagnosis performance under unknown working conditions, domain generalization technologies have been extensively studied. However, the existing methods predominantly gather the sensor data from multiple source domains together for model training, which poses a threat to data privacy in the IIOT. To address this problem, this paper proposes a novel gradient alignment federated domain generalization (GAFedDG) framework for rotating machinery fault diagnosis. In the proposed GAFedDG, an intra-domain gradient aligning mechanism is designed to minimize the gradient discrepancy between the current classifier on raw signals and augmented signals, effectively preventing the local model from overfitting the domain-specific fault knowledge. In addition, to bridge the domain shifts across multiple scattered source domains, an inter-domain gradient aligning mechanism is implemented to minimize the gradient discrepancy between the current classifier and other domain classifiers. By combining the two mechanisms above, a domain-agnostic model that can generalize well on unseen working conditions is established. Extensive experimental results on two self-built test rigs show that the GAFedDG possesses superior generalization capability in privacy-preserving scenarios. © 2014 IEEE.

关键词： Industrial internet of things (IIoT)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：