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Research on co.denser Deterioration Evolution Trend Based on ANP-EWM Fusion Health Degree

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co.puter Modeling in Engineering & Sciences 2024年第4期139卷 679-698页

作者： Hong Qian Haixin Wang Guangji Wang Qingyun Yan co.lege of automation Engineering Shanghai University of Electric PowerShanghai200090China Shanghai Key Laboratory of Power Station automation Technology Shanghai200072China Empower Information Technology(Shanghai)co. Ltd.Shanghai201508China China Nuclear Power Engineering Design co. Ltd.Shenzhen518052China

This study presents a proposed method for assessing the co.dition and predicting the future status of co.densers operating in seawater over an extended period.The aim is to address the problems of scaling and co.rosion,which lead to increased loss of co.d resources.The method involves utilising a set of multivariate feature parameters associated with the co.denser as input for evaluation and trend prediction.This methodology offers a precise means of determining the optimal timing for co.denser cleaning,with the ultimate goal of improving its overall performance.The proposed approach involves the integration of the analytic network process with subjective expert experience and the entropy weightmethod with objective big data analysis to develop a fusion health degreemodel.The mathematical model is co.structed quantitatively using the improved Mahalanobis distance.Furthermore,a co.prehensive prediction model is developed by integrating the improved Informer model and Markov error co.rection.This model takes into acco.nt the health status of the equipment and several influencing factors,includingmultivariate feature characteristics.This model facilitates the objective examination and prediction of the progression of equipment deterioration trends.The present study involves the co.putation and verification of the field time series data,which serves to demonstrate the accuracy of the co.denser health-related models proposed in this research.These models effectively depict the real co.dition and temporal variations of the equipment,thus offering a valuable method for determining the precise cleaning time required for the co.denser.

关键词： co.denser health degree improved Mahalanobis distance GC-Informer model Markov error co.rection

Mitigation of Deane and Hamill phenomenon in gallium nitride high-voltage power supply for electric propulsion system application

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High Voltage 2024年第1期9卷 252-265页

作者： Minghai Dong Hui Li Shan Yin Kye Yak See Yingzhe Wu Xiong Xin School of Aeronautics&Astronautics University of Electronic Science and Technology of ChinaChengduChina School of Electrical&Electronic Engineering Nanyang Technological UniversitySingaporeSingapore School of automation Engineering University of Electronic Science and Technology of ChinaChengduChina Innoscience(shenzhen)Semico.ductor co.Ltd. ShenzhenChina

The step-up resonant co.verters are widely adopted to provide high voltage in kV-level for electric propulsion system due to their high efficiency,low mass,modularisation,and high-power density.The bipolar co.kcroft-Walton voltage multiplier(BiCWVM)is a major circuit that steps up the voltage in the resonant co.verter.However,the diode nonlinearity in BiCWVM can introduce self-sustained quasi-periodic oscillations in the voltage and current waveforms,which is co.monly known as the Deane and Hamill(DH)phenomenon.The oscillation can lead to higher magnetic loss and co.trol failure,and it is more likely to present in the gallium nitride-based co.verter due to the highfrequency operation.The authors aim to investigate and mitigate the DH phenomenon systematically so that proper mitigation can be implemented.To facilitate the investigation,the circuit before the BiCWVM in the co.verter is derived and modelled as a voltage source v_(m)and a series inductor L_(sy).Also,the reverse reco.ery process of the diode in the BiCWVM can be represented by a piecewise-linear(PWL)model,with the simplified circuit and PWL model,the relationship between voltage and current under different operating co.ditions can be determined with ease.The relationship allows to understand the mechanism of diode reverse reco.ery in BiCWVM that leads to DH phenomenon.Finally,a hybrid-/full-silico. carbide(SiC)design is proposed to mitigate the DH phenomenon,which is verified experimentally for a 300-kHz,5-W,20-V/1.5-kV GaN-based step-up resonant co.verter.

关键词： power resonant high

The Pairing Analysis Improvement of Magnetized Structure in Electromagnetic Bulging Process in Case of Tube with Field Shaper

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Journal of Electromagnetic Analysis and Applications 2024年第4期16卷 43-67页

作者： Blaise Kevine Lenz Soronga Zhanqian Zhan Jing Liu Jonas Asamoah Mohamed Bangali Bangura Matala Makiese N’kodia Kambani Chrionie Md Jobayer Hossain Yongdong Chen Program Debugging and Design Department Guangdong Lyric Robot Automation Co. Ltd Huizhou China Electrical and automation Department China Three Gorges University Yichang China Electronic Department Power Electronic Research Center University of Kent Giles Ln Canterbury UK Program Debugging Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China Electrical and co.puter Engineering Department South China University of Technology Guangzhou China World Standardization Certification and Testing Group (Shenzhen) Co. Ltd. Shenzhen China Electrical Engineering-Power System Mapon University Kindu Democratic Republic of Congo Department of Eco.omy Managment School of Management Computer and Telecomunication Rabbat Marocco Materials Visual Calibration Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China Program Design Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China

In the current practical science, the accuracy in the formability of metal alloys being the goal when using electromagnetic forming (EMF) technology, which is a high-speed processing technology that uses Lorentz forces to achieve plastic deformation of sheet metal;acco.ding to the previous analysis, the results have shown that in most cases, the Lorentz force acting on the workpiece (metal) is not uniform, there are uneven axial deformations of the metal plates which prevent the rapid advancement of today’s technology. In this article, we presented some advanced analyzes which will lead us to improve the technical solution for the problems of non-uniform axial deformations of the metals in the traditional tube electromagnetic forming technology (EMF). A field shaper is used as a practical forming tool to influence the magnetic field and magnetic pressure distribution, thereby improving the forming ability and result during the electromagnetic forming (EMF) process and we see that induced eddy current co.trol is realized by changing the structural parameters of the magnetic field shaper;which improves the strength and co.trollability of the magnetic force that acts on the workpiece;thereby a greater radial magnetic pressure can be achieved with field shaper than the case without it;the field shaper regulates the electromagnetic force, the distribution of the magnetic pressure decreases, and the uniform force area of the tube increases which effectively enhances the uniform range of the pipe electromagnetic bulging and the electromagnetic induction co.pling between the co.l and the metallic workpiece is generally required to produce the Lorentz forces. Using co.SOL Multiphysics® simulation software helped us to accurately represent the real world, simulating multiple physical effects that happened in this model during the process.

关键词： Electromagnetic Forming Field Shaper Lorentz Force Magnetic Pressure Distribution

Optimization of the Internal Circulating Fluidized Bed Using co.putational Fluid Dynamics Technology

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Fluid Dynamics & Materials Processing 2022年第2期18卷 303-312页

作者： Xiangxi Du Muyun Liu Yanhua Sun School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China shenzhen cellauto automation co. Ltd.ShenzhenChina

The co.putational fluid dynamics(CFD)technology is analyzed and calculated utilizing the turbulence model and multiphase flow model to explore the performance of internal circulating fluidized beds(ICFB)based on CFD.The three-dimensional simulation method can study the hydrodynamic properties of the ICFB,and the performance of the fluidized bed is optimized.The fluidization performance of the ICFB is improved through the experimental study of the cross-shaped baffle.Then,through the cross-shaped baffle and funnel-shaped baffle placement,the fluidized bed reaches a co.pled optimization.The results show that CFD simulation technology can effectively improve the mass transfer efficiency and performance of sewage treatment.The base gap crossshaped baffle can improve the hydraulic co.ditions of the fluidized bed and reduce the system energy co.sumption.The cross-shaped baffle and funnel-shaped baffle can perfect the performance of the reactor and effectively strengthen the treatment in the intense aerobic process of industrial sewage.

关键词： Internal circulating fluidized bed co.putational fluid dynamics optimization design internal

Hierarchical crystalline-amorphous nanoco.posites with high strength and large deformability enabled by elemental diffusion

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Journal of Materials Science & Technology 2024年第4期171卷 150-161页

作者： Liqiang Wang Heyi Wang Xin Zhou Huangliu Fu James Utama Surjadi Shuo Qu Xu Song Rong Fan Yang Lu Department of Mechanical Engineering City University of Hong KongHong KongChina Nano-Manufacturing Laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen 518057China Chengdu Research Institute City University of Hong KongChengdu 610200China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical and automation Engineering The Chinese University of Hong KongHong KongChina Department of Mechanical Engineering The University of Hong KongHong KongChina

Amorphous/nanocrystalline dual-phase structures have recently emerged as an effective way for over-co.ing the strength-ductility trade-offand breaking the limitation of the reverse Hall-Petch effect.Here,we proposed a new strategy to develop a hierarchical and interco.nected amorphous-crystalline nanoco.posite arising from the nanoscale elemental interdiffusion and oxygen adsorption behavior dur-ing thermal treatment processes.The nanoco.posite co.sisted of a three-dimensional(3D)hierarchical network structure where the crystalline phase(Cr-co.Ni-Al)was embedded into the Al-O-based amor-phous phase network with critical feature sizes enco.passing three orders of magnitude(from microm-eter to nanometer scale).It can achieve ultrahigh co.pression yield strength of-3.6 GPa with large homogeneous deformation of over 50%strain.The massive interstitial atoms induced lattice distortion and hierarchical amorphous phase boundary co.tributed to the strength improvement.in situ Uniaxial co.pression inside a transmission electron microsco.e(TEM)revealed that the exceptional deformability of the nanoco.posites resulted from the homogenous plastic flow of nano-sized amorphous phase and the plastic co.deformation behavior restricted by the nano-architected dual-phase interface.The proposed dual-phase synthesis approach can outperform co.ventional nanolaminates design strategies in terms of the mechanical properties achievable while providing a pathway to easily tune the microstructure of these nanolaminates.

关键词： Nanolaminates Dual-phase nanoco.posites In situ transmission electron microsco.y Multi-co.ponent alloy

路堑过渡段对高速列车气动荷载的影响:基于IDDES方法

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Journal of Central South University 2024年第3期31卷 989-1002页

作者：赵伦邓锷杨伟超倪一清赵文罗禄森 School of Civil Engineering Central South UniversityChangsha 410075China National Rail Transit Electrification and automation Engineering Technology Research Center(Hong Kong Branch) The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomHong KongChina The Hong kong Polytechnic University shenzhen Research Institute ShenzhenChina National Engineering Research Center of High-speed Railway co.struction Technology Central South UniversityChangsha 410075China China Railway Eryuan Engineering Group co. Ltd.Chengdu 610031China

当高速列车在横风条件下通过路堑过渡段时,列车的气动荷载将发生显著变化。本文基于改进的延迟分离涡湍流模型建立了列车-路基-风的三维空气动力学耦合模型,重点探讨了路堑深度对列车气动载荷变化和气动性能恶化的影响,揭示了相应的列... 详细信息

当高速列车在横风条件下通过路堑过渡段时,列车的气动荷载将发生显著变化。本文基于改进的延迟分离涡湍流模型建立了列车-路基-风的三维空气动力学耦合模型,重点探讨了路堑深度对列车气动载荷变化和气动性能恶化的影响,揭示了相应的列车周围流场的演化机制。结果表明:当路堑深度为6 m时,头车所受的气动冲击能量最高。在列车完全驶入下一运行场景后,随着路堑深度的增大,来流对列车气动荷载的影响减弱,相应的波动幅度降低。头车气动载荷的突变幅值与风速近似满足线性正相关关系。

关键词：高速列车路堑过渡段气动荷载流场横风

Review of chiplet-based design: system architecture and interco.nection

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Science China(Information Sciences) 2024年

作者： Yafei LIU Xiangyu LI Shouyi YIN School of Integrated Circuits Tsinghua University Laboratory of Integrated Circuits and Intelligence Systems Research Institute of Tsinghua University in Shenzhen

Abstract Chiplet-based design, which breaks a system into multiple smaller dice (or “chiplets”) and reassembles them into a new system chip through advanced packaging, has received extensive attention in the post Moore’s law era due to its advantages in terms of co.t, performance, and agility. However, significant challenges arise in this implementation approach, including the mapping of functional co.ponents onto chiplets, co.optimization of package and architecture, handling the increased latency of co.munication across functions in different dies, the uncertainty problems of fragment co.munication subsystems, such as maintaining deadlock-free when independently designed chiplets are co.bined. Despite various design approaches that attempt to address these challenges, surveying these approaches one-after-another is not the most helpful way to offer a co.parative viewpoint. Acco.dingly, in this paper, we present a more co.prehensive and systematic strategy to survey the various approaches. First, we divide them into chiplet-based system architecture design and interco.nection design, and further classify them based on different architectures and building blocks of interco.nection. Then, we analyze and cross-co.pare each classification separately, and in addition, we present a topical discussion on the evolution of memory architectures, design automation, and other relevant topics in chiplet-based designs. Finally, some discussions on important topics are presented,emphasizing future needs and challenges in this rapidly evolving field.

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Multi‐objective particle swarm optimisation of co.plex product change plan co.sidering service performance

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 1058-1076页

作者： Ruizhao Zheng Yong Zhang Xiaoyan Sun Faguang Wang Lei Yang Chen Peng Yulong Wang School of Information and co.trol Engineering China University of Mining and TechnologyXuzhouChina shenzhen Skyworth RGB Electronics co. LtdShenzhenChina School of Mechatronic Engineering and automation Shanghai UniversityShanghaiChina

Design change is an inevitable part of the product development process.This study proposes an improved binary multi‐objective PSO algorithm guided by problem char-acteristics(P‐BMOPSO)to solve the optimisation problem of co.plex product change plan co.sidering service performance.Firstly,a co.plex product multi‐layer network with service performance is established for the first time to reveal the impact of change effect propagation on the product service performance.Seco.dly,the co.cept of service performance impact(SPI)is defined by deco.pling the impact of strongly associated nodes on the service performance in the process of change affect propagation.Then,a triple‐objective selection model of change nodes is established,which includes the three indicators:SPI degree,change co.t,and change time.Furthermore,an integer multi‐objective particle swarm optimisation algorithm guided by problem characteristics is developed to solve the model above.Experimental results on the design change problem of a certain type of Skyworth TV verify the effectiveness of the established optimisation model and the proposed P‐BMOPSO algorithm.

关键词： multi‐objective particle swarm optimization product change service performance

Reliability Analysis of a Switched Reluctance Starter/Generator

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Protection and co.trol of Modern Power Systems 2024年第1期9卷 112-121页

作者： Hao Chen Fan Yang Lijun Xu Qiwei Lu Xiqiang Chang Xing Wang Lijiang Dong Yi Wen Jiang Chen Gang Miao Jianmin Hu Guanjun Wang Wei Li Xiaohua Bao School of Electrical Engineering China University of Mining and TechnologyXuzhou 221116China Xinjiang Institute of Engineering Urumqi 830000China International Joint Research Center of Central and Eastern European co.ntries on New Energy Electric Vehicle Technology and Equipment Xuzhou 221008China International co.peration Joint Laboratory of New Energy Power Generation and Electric Vehicles of Jiangsu Province co.leges and Universities Xuzhou 221008China School of Information and Electrical Engineering China University of Mining and TechnologyXuzhouChina China University of Mining and Technology(Beijing) BeijingChina State Grid Xingjiang Electric Power co. Ltd.UrumqiXinjiangChina China University of Mining and Technology XuzhouChina State Grid Xinjiang co.pany Limited Electric Power Research Institute UrumqiXinjiangChina Xinjiang Fukang Pumped Storage Power co.pany Limited UrumqiXinjiangChina State Grid Urumqi Electric Power Supply co.pany UrumqiXinjiangChina Wuxi Inspection and Testing Certification Research Institute WuxiJiangsuChina Anhui Wannan Electric Machine co. Ltd.WannanAnhuiChina Hefei University of Technology in Electrical and automation Engineering

In this paper,the co.bined k-out-of-n:G model and reliability block diagram model is used to analyze the reliability of a switched reluctance starter/generator system.First,the different operational modes of a switched reluctance motor starter/generator are analyzed,and the fault states of the system are briefly described.Then the fault criteria of the system in different operational states are put forward.Seco.dly,a relia-bility block diagram model is established to calculate the system-level reliability,and the k-out-of-n:G model is adopted to analyze the reliability of each part of the switched reluctance starter/generator system.To verify effectiveness,the first-order Markov model is also used to analyze the reliability of each part of the switched reluc-tance starter/generator system.co.sidering the co.pu-tational co.plexity and accuracy of the system,the k-out-of-n:G model is more suitable for system co.ponent level reliability analysis.Finally,a 6/4 switched reluctance motor is used as the simulated and experimental platform motor.The final results verify the effectiveness of the reliability analysis model.

关键词： system switched generator