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

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)

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Forces of fully nonlinear interfacial periodic waves on a cylindrical pile in a two-layer fluid with free-surface boundary conditions

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Journal of Ocean engineering and science 2023年第6期8卷 662-674页

作者： Jiyang Li Zeng Liu Jie Cui School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiangJiangsu 212000PR China School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074PR China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics(HUST) Wuhan 430074China Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships Wuhan 430074PR China

In the frame of fully nonlinear potential flow theory,series solutions of interfacial periodic gravity waves in a two-layer fluid with free surface are obtained by the homotopy analysis method(HAM),and the related wave forces on a vertical cylinder are *** solution procedure of the HAM for the interfacial wave model with rigid upper surface is further developed to consider the free surface *** forces of nonlinear interfacial periodic waves are estimated by both the classical and modified Mori-son *** is found that the estimated wave forces by the classical Morison equation are more conservative than those by the modified Morison’s formula,and the relative error between the total inertial forces calculated by these two kinds of Morison’s formulae remains over 25%for most cases unless the upper and lower layer depths are both large *** demonstrates that the convective acceleration neglected in the classical Morison equation is rather important for inertial force exerted by not only internal solitary waves but also interfacial periodic *** of these should further deepen our understanding of internal periodic wave forces on a vertical marine riser.

关键词： Interfacial periodic waves Wave force Cylindrical pile Homotopy analysis method Morison equation

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Anti-blast performance optimization design of corrugated sandwich structures based on BP-GA method 9th

Anti-blast performance optimization design of corrugated san...

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9th International Conference on Marine Structures, MARSTRUCT 2023

作者： Qiu, Weijian Liu, Kun Wang, Jiaxia Gao, Zhen Guo School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

ISBN: (纸本)9781032506364

The anti-blast performance of ship structures is key to the survivability of war ships. In order to improve the anti-blast performance of metal corrugated sandwich plates under blast loading, a structural optimization method based on the back propagation neural network (BPNN) and genetic algorithm (GA) is proposed in the paper. In this method, the mass, stress, deformation and energy absorption of the structure under the action of blast loading are taken as the evaluation criteria. The relationship between the geometric parameters of corrugated sandwich plate and the evaluation criteria is established based on the BPNN. By solving the multi-objective optimization problem using the GA, the structural dimensions with the best blast resistance are determined. The blast resistance of the optimized sandwich plate is significantly improved. The proposed optimization method can serve for the improvement of the ship safety. © 2023 The Author(s).

关键词： Genetic algorithms

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Prediction of wave run-up on single cylinder based on LSTM neural network

Prediction of wave run-up on single cylinder based on LSTM n...

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2023 International Joint Conference on Civil and Marine engineering, JCCME 2023

作者： Liu, Tianyu Deng, Jiaxain Xu, Gang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

ISBN: (纸本)9781839539954

As the column cylinder is commonly used for floating structures and the sea state is random, the wave run-up on cylinder with ocean waves interaction is always with strong nonlinearity and randomness. Compared to neural network tec hnology, the traditional CFD calculation method is not a suitable way for the prediction. In this paper, STAR-CCM+ is used to establish a numerical wave tank to generate of 300s irregular wave data, and the monitoring points are arranged around th e single cylinder to capture the wave height. Through dimensionless processing and comparison, the time-history wave heig ht data on the monitoring point with the largest wave run-up is selected as the data source. The long short-term memory n eural network model is used for training and prediction, and the accuracy of the results are analyzed. It provides a practical guidance scheme for accurate prediction of wave run-up. © The Institution of engineering & technology 2023.

关键词： Ocean currents

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The CFD Investigation of General FPSO Green Water 12

The CFD Investigation of General FPSO Green Water

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2022 International Conference on Acoustics, Fluid Mechanics and engineering, AFME 2022 and the 12th Green''s Function Seminar, GFS 2022

作者： Li, Min Dou, Peilin Qi, Yue School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

The main research is to investigate the seakeeping effect resulting from general FPSO hull bow flare. CFD-FV (Computational Fluid Dynamics-Finite Volume) method is applied with fluent software to simulate in the 3D time domain. Simulation objects are two different bow flare models exposed to the green water phenomenon, which is under the sea state of the Brazilian sea 20 years of return extreme sea state. Seakeeping analysis includes green water. The results indicated that a 3.5 m vertical bow flare would reduce about 35.09% level of green water on deck. A comprehensive comparison indicated that bow flare improved the global seakeeping performance, which can be used as a reference to the design of general FPSO hull bow flare. © Published under licence by IOP Publishing Ltd.

关键词： Seakeeping

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Detailed Analysis of Friction in Water-Lubricated Bearings under Boundary Lubrication: Model Development and Experimental Validation

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Journal of Tribology 2025年第10期147卷 104101页

作者： Yang, Chaozhen Liu, Xueshen Huang, Zhangkai Wang, Ting Chen, Meixia School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan HUBEI430063 China School of Mechanical Engineering Zhengzhou University of Aeronautics Zhengzhou HENAN430063 China

A novel friction model for water-lubricated bearings under boundary lubrication conditions is proposed. The effects of speed, load, surface roughness, and material properties on the friction coefficient are examined. The model is validated through experimental tests using nitrile-butadiene rubber (NBR) and ultrahigh molecular weight polyethylene (UHMWPE) materials, demonstrating reliability and applicability. The impact of varying speed and load on lubrication regimes is analyzed, with a focus on the behavior of micro-convex contact friction under boundary lubrication conditions. Based on the verified friction model, the influence of surface roughness and texture direction on bearing performance is also explored, offering actionable insights for optimizing bearing design. This model provides critical insights for enhancing friction management and noise reduction in water-lubricated bearings, offering valuable guidance for their design and manufacturing. Copyright © 2025 by ASME.

关键词： Tribology

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Hydrodynamic Performance Verification and Analysis of Flexible Floating Breakwater

Hydrodynamic Performance Verification and Analysis of Flexib...

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2023 International Joint Conference on Civil and Marine engineering, JCCME 2023

作者： Deng, Jiaxian Liu, Xiaohan Xu, Gang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China

ISBN: (纸本)9781839539954

Ships will be affected by the waves directly in the sea environment and the resistance of the ship increases when it is sailing in the waves. Meanwhile, if it has amphibious landing equipment out of the ship, it is difficult to operate. Therefore, it is necessary to arrange a flexible wave elimination system near the ship to improve flow, which is useful for releasing amphibious landing equipment. In this paper, the numerical simulation of a floating breakwater is carried out, and the simulation results are compared with the experimental data to verify the reliability of the present numerical model. We can conclude that the wave amplitude increases with the increase of the period while the wave height is constant. With the increase of the period, the wave elimination efficiency decreases obviously. © The Institution of engineering & technology 2023.

关键词： Floating breakwaters

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Analysis of the response of wind-induced vibrations on flexible photovoltaic mounts 8

Analysis of the response of wind-induced vibrations on flexi...

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

作者： Wu, Sichuan Wu, Haikian Lou, Yibing School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai200240 China Co Nantong Municipality Jiangsu 226116 China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212000 China

This article investigates a flexible photovoltaic bracket's response to wind vibration. A finite element model is established using SAP2000 software for time course analysis. Representative units and nodes were selected to analyze internal force response, displacement response, and acceleration response. The prestress and span change rule of the flexible photovoltaic bracket are also explored, and quantitative research is conducted on the size of prestress and span size. The magnitude of the prestress affects a structure's responsiveness to wind vibration. As prestress grows, so do deflection and acceleration, and the rate at which axial force is increasing also increases. Conversely, when prestress increases, the rate of deflection reduction falls. Consequently, considering the prestress size, it is advised that 50-kN prestressing be used for the support and wind cables. As the span rises, so do the mid-span span and the axial force of the wind cables, while acceleration also increases. The rate of mid-span deflection increases gradually with the flexible PV mount span, but the rate of axial force increase decreases. It is recommended to limit the span to below 50 m. © Published under licence by IOP Publishing Ltd.

关键词： Deflection (structures)

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General-purpose FPSO Acceleration Load Calculation Error Correction 8

General-purpose FPSO Acceleration Load Calculation Error Cor...

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8th International Conference on Electromechanical Control technology and Transportation, ICECTT 2023

作者： Wang, Zhen Dou, Peilin Chen, Huimin School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212000 China

ISBN: (纸本)9781510668331

In order to accurately analyze the acceleration load acting on the general FPSO pipeline system, based on the potential flow theory, the hydrodynamic calculation software is used to analyze the long-term forecast value of the acceleration of the general FPSO under different overrun probabilities, and the calculated value of the fatigue load coefficient for fatigue evaluation is obtained, and the regression analysis is carried out. At the same time, the design wave method is used to convert the acceleration envelope value at any position of the general-purpose FPSO into a fatigue evaluation load, and a simplified formula for acceleration calculation is fitted. The results show that the applicability of the simplified formula is ideal. Provides a simple algorithm for calculating acceleration loads for general-purpose FPSOs. © 2023 SPIE.

关键词： Regression analysis

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Structure-property relationship analysis of metal-organic frameworks(MOFs) doped proton exchange membrane(PEM)

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International Journal of Hydrogen Energy 2025年 141卷 811-822页

作者： Chen, Ruiyuan Li, Jiapeng Zhao, Pengyu Tolj, Ivan Li, Song Tu, Zhengkai School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture University of Split Split21000 Croatia

The introduction of metal-organic frameworks (MOFs) into proton exchange membranes (PEM) to improve their proton conductivity has received growing research interests in recent studies. However, given the enormous number of MOFs, the guidelines to select suitable MOFs for designing high-performing composite membranes are still elusive. In order to reveal the underlying structure-property relationships of composite membranes, a MOFs doped PEM (MOF@PEM) database was established based on the collected proton conductivity of composite membranes from literature in this work. By analyzing the impacts of measurement conditions, MOF loading, water uptake, and MOF modification strategies on the proton conductivity of MOF@PEM, it is found that Grotthuss mechanism plays a dominant role in proton transfer in composite membrane with activation energy below 0.4 eV. The proton conductivities of most MOF@PEM exhibit an initial increase followed by a decrease with MOF loading owing to the disrupted proton transfer channels resulting from MOF aggregation. Besides, although water uptake imposes positive impacts on their proton conductivity, the reduced proton conductivity of specific MOF@PEM at high water uptake demonstrates that other factors such as the spatial distribution of MOF particles and interactions between MOF particles may play critical roles in affecting their proton conductivity. Moreover, chemically or physically modified MOFs as dopants enables the improved proton conductivity of composite membrane owing to the increased proton carriers, reduced tortuosity of proton transfer channels or enhanced water uptake. The current limitations and future perspective for developing high-performance MOF@PEM was proposed in this work. © 2024 Hydrogen Energy Publications LLC

关键词： Activation energy

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