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2023 2nd International Conference on New Energy, Energy Storage and power Engineering, NESP 2023

作者： Sun, Yanzhao Zou, Tao Li, Dianhong Li, Juntao School of Electrical Engineering and Automation Wuhan University Hubei Wuhan430072 China Big Pawer Electrical Technology Xiangyang Co. Ltd. Hubei Xiangyang441057 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Hubei Xiangyang441053 China Hunan Vanadium Valley New Energy Technology Co. Ltd. Hunan Changsha410116 China

When the vanadium battery was running, pump frequency and current density were two frequently adjusted parameters. When the pump frequency was constant, the main flow-electrical parameter variation needs to be further studied. To this end, a 10 kW vanadium battery was built. When the current density was relatively high during the charge-discharge, the flow-electrical parameters of the cathode and anode including the temperature, flow resistance, turning voltage difference, capacity loss, energy loss and energy efficiency were studied. Besides, the compositions of capacity and energy were introduced, and the loss calculation scheme was proposed. Firstly, in flow analysis, the flow resistance was defined, which represents the flow state of the electrolyte. It was found that the flow resistance was nearly linear with the temperature. Secondly, in electric analysis, the turning voltage difference increased with the current density increasing. For the same current density, the total energy loss of charge was less than the discharge, and the energy loss of bypass was less than the internal resistance. With the current density increasing, the energy efficiency decreased. The research can be provided insight into the optimizing operation for the vanadium battery. © Published under licence by IOP Publishing Ltd.

关键词： Current density

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Propagation Characteristics of End-Winding Insulation Fatigue Damage in Variable Frequency Motor Under Multi-Field Coupling

Propagation Characteristics of End-Winding Insulation Fatigu...

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IEEE Conference on electromagnetic Field Computation

作者： Bangwei Zhang Haijun Zhang Jiashun Wang Yuxin Cao Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei university of Arts and Science Xiangyang China School of Electronic Information Engineering Taiyuan University of Science and Technology Taiyuan China

ISBN: (数字)9798350348958

ISBN: (纸本)9798350348965

In this paper, the fatigue propagation mechanism of motor stator insulation damage under variable frequency drive is studied by combining theoretical analysis and finite element numerical simulation. Based on the magneto-thermo-solid coupling and fatigue damage theory, the stress-strain state, crack damage degree and propagation rate of motor stator insulation are analyzed. The crack damage propagation at different positions of the end winding outlet, middle and nose end is simulated and calculated by three-dimensional finite element method. It is found that the stress, strain and stress intensity factor of the end winding insulation at the outlet position change violently, which reflects that the crack damage is easier to expand and the propagation rate is greater. The results of this paper can provide reference for the evolution law, fault diagnosis and optimization design of insulation damage of variable frequency drive motor under complex working conditions.

关键词： Couplings Insulation Windings Stator windings Variable speed drives Motors Fatigue

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Crack Propagation of Ground Insulation Failure for Large Motor End-Winding Based on electromechanical Coupling Phase Field Model

Crack Propagation of Ground Insulation Failure for Large Mot...

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IEEE Conference on electromagnetic Field Computation

作者： Xiaobo Wu Haijun Zhang Bolong Wang Guowen Cao Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Xiangyang China Xiangyang CRRC Motor Technology Co. Ltd. Xiangyang China

ISBN: (数字)9798350348958

ISBN: (纸本)9798350348965

The ground insulation is a key component for large electrical machine, which may present the crack defect after the process treatment and assembly of manufacturing. In this paper, the crack propagations of the ground insulation failure with initial crack in stator end-winding of the large motor were studied by using the coupled phase field model. In the proposed model, the coupled effects of mechanical and electrical fields on the crack propagation and the evolutions were considered by using phase field method and finite element analysis. The results in this paper may provide a new way for the research of multi-factor damage diagnosis and life prediction of motor insulation coupling.

关键词： Couplings Insulation Analytical models Computational modeling Stators Motors Finite element analysis

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Transfer Task-Averaged Natural Gradient for Efficient Many-Task Optimization

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IEEE Transactions on Evolutionary Computation 2024年

作者： Li, Yanchi Gong, Wenyin Gu, Qiong China University of Geosciences School of Computer Wuhan430074 China Hubei University of Arts and Science School of Computer Engineering Xiangyang441053 China Hubei University of Arts and Science Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang441053 China

With the increasing requirement for computational efficiency in evolutionary algorithms when tackling many optimization tasks concurrently, many-task optimization (MaTO) has gained much attention in recent years. It involves extracting and transferring the knowledge from successful search experiences across many tasks. As the number of tasks and variable scale grows in MaTO, the need for efficient knowledge transfer in evolutionary algorithms becomes indispensable. In this paper, we present a task-averaged natural gradient-assisted natural evolution strategy (TNG-NES) to deal with MaTO efficiently. The task-averaged natural gradient captures how a group of task distributions evolves, considering their overall trends of mean and covariance. This can accelerate the optimization process across all tasks by leveraging the evolutionary similarities among multiple task search distributions. Notably, TNG-NES exhibits linear computational complexity concerning the number of tasks for knowledge transfer. Additionally, to adaptively utilize task-averaged natural gradient for distribution evolution and mitigate negative transfer, we introduce a transfer adaptive control mechanism for TNG-NES. We conducted extensive experiments on CEC19-MaTO, WCCI22-MaTO, our proposed large-scale MaTO benchmark suite, and real-world applications. The results validate the effectiveness of TNG-NES, outperforming state-of-the-art MaTO algorithms. © 1997-2012 IEEE.

关键词： Knowledge transfer

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Automating smart Internet of Things devices in modern homes using context-based fuzzy logic

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Computational Intelligence 2024年第1期40卷 e12370-e12370页

作者： Ming, Chen Kadry, Seifedine Dasel, A. Antony Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Xiangyang China School of Automotive and Traffic Engineering Hubei University of Arts and Science Xiangyang China Department of Mathematics and Computer Science Beirut Arab University Beirut Lebanon Department of Mechanical Engineering VIT University Vellore India

Internet of Things (IoT) is mainly used to connect different embedded objects over the internet to make communication between them possible. With the help of IoT, devices find a way to interact, work together, and study from each other's experiences just like humans do. IoT finds its way in applications such as smart home, smart city, healthcare, agriculture, and so on. The name smart home arises due to the automation of the normal home appliances to make it smart. When the devices of the normal smart home are connected via the internet, they become a part of the IoT. The smart home should ensure the following characteristics such as security, comfort, convenience, and energy saving. The article presents a technique for IoT controlled devices in a smart home using context-based fuzzy logic. Fuzzy logic is mainly used to monitor and analyze the real-time data collected from the sensors in the smart homes from various environments. Context-based fuzzy logic uses a multivalued logic principle which differs from the normal Boolean logic, where the truth value lies between only zero and one (ie, true or false). The proposed smart home is implemented in a real case scenario where it yields an accuracy of 90.5%, response time of 6.41 milliseconds, and an F-measure of 97%. © 2020 Wiley Periodicals LLC.

关键词： Internet of things

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Stackelberg-Game Computation Offloading Scheme for Parked Vehicle-Assisted VEC and Experiment Analysis

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-12页

作者： Liu, Chunhong Zhao, Mengdi Wang, Huaichen Cheng, Bo Liu, Jialei Yuan, Peiyan Engineering Lab of Intelligence Business & Internet of Things and School of Computer and Information Engineering Henan Normal University Xinxiang China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle and School of Computer Engineering Hubei University of Arts and Science Xiangyang China

Vehicle edge computing (VEC) offers users low-latency and high-reliability services by using computational resources at the network's edge. Nevertheless, because of inadequate infrastructure and limited resources, computation-intensive and delay-sensitive vehicle applications cannot be performed efficiently at the edge. Therefore, several studies have used the idle resources of parked vehicles to assist in computation offloading. In this paper, we propose a parked vehicle-assisted vehicle edge computing architecture considering multi-agent collaboration, including intelligent vehicles and edge servers. Additionally, we propose a framework for a parallel Internet of Vehicles (IoV) utilizing computational experiment. The service provider is assigned the role of owning VEC resources and recruiting parking vehicle resources. The model was constructed by using the resource consumption-service relationship of both offloading parties to ensure service quality. First, a Stackelberg game model was constructed based on the interaction between requesting vehicles and a service provider. The latter was the leader, and the requesting vehicles were the followers. The Nash equilibrium for optimal pricing and offloading allocations was attained and verified, and a distributed gradient-based equilibrium algorithm was designed to solve the Stackelberg game model and obtain the final decision through mutual communication. The method also protects the privacy of participants and respects the willingness of requesting vehicles to offload. Finally, the simulation experiments confirmed that the proposed algorithm can achieve game equilibrium. Furthermore, it outperformed state-of-the-art algorithms in improving the service provider's utility. IEEE

关键词： Vehicles

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Evolutionary Competitive Multiobjective Multitasking: One-Pass Optimization of Heterogeneous Pareto Solutions

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IEEE Transactions on Evolutionary Computation 2024年

作者： Li, Yanchi Wu, Xinyi Gong, Wenyin Xu, Meng Wang, Yubo Gu, Qiong China University of Geosciences School of Computer Wuhan430074 China Nanyang Technological University College of Computing and Data Science 639798 Singapore Hubei University of Arts and Science School of Computer Engineering Xiangyang441053 China Hubei University of Arts and Science Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang441053 China

Competitive multiobjective multitask optimization (CMO-MTO) problems involve multiple tasks with comparable objectives but heterogeneous decision variables. The final Pareto front in CMO-MTO consists of multiple subsets corresponding to different tasks. Since the Pareto front subset of one task may be dominated by that of another, competition arises among tasks. Additionally, there may be exploitable similarities among tasks that evolutionary multitasking methods can leverage. For a comprehensive study of CMO-MTO, we construct 12 benchmark CMO-MTO problems with varied competitive relationships and inter-task similarities. To effectively solve CMO-MTO problems, we propose a reference vector contribution-based multitask evolutionary algorithm (RVC-MTEA). RVC-MTEA facilitates both global and local knowledge transfer based on vector contributions and integrates global archives to gather non-dominated solutions across multiple competitive tasks. Comparative results with four popular single-task and six state-of-the-art multitask evolutionary algorithms demonstrate the efficacy of RVC-MTEA. Finally, we apply RVC-MTEA to several real-world applications, showcasing the potential of CMO-MTO in practical decision-making scenarios. © 1997-2012 IEEE.

关键词： Competition

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Variable Speed Leakage Characteristics of Scroll Compressors for Miniature Compressed Energy Storage

SSRN

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SSRN 2024年

作者： Qi, Shijia Liu, Zhen Li, Zheng Zhang, Zhichao Huang, Tengjun Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Hubei Xiangyang441053 China School of Automotive and Traffic Engineering Hubei University of Arts and Science Hubei Xiangyang441053 China Department of Mechanical and Construction Engineering Northumbria University Newcastle upon TyneNE1 8ST United Kingdom

Scroll compressor is especially suitable for miniature compressed air energy storage systems. This paper analyzes the influence of rotational speed on the radial leakage characteristics of a scroll compressor by developing a three-dimensional transient numerical model with radial clearance. In this model, the fluid flow in the chamber of the scroll compressor at different rotating speeds is simulated using the dynamic grid technology. The method of monitoring points is used to obtain a lot of flow field information in the chamber during the working process, thus revealing the change in the transient flow field in the chamber and the influence of rotational speed on compression performance. The results show that within a certain speed range, when the power consumption increases, the deviation between the theoretical volume flow rate and the actual volume flow rate increases with the increase in speed, but the leakage loss gradually decreases. The leakage flow disturbs the uniformity of flow field distribution in the corresponding chamber but does not change the evolution trend of the flow field. The air flow rate in each chamber is gradually increasing. Still, the upstream diffusion of the leakage air flow temperature in the same compression chamber is blocked, which leads to a gradual decrease in the air temperature in the corresponding chamber. As a result, the temperature in the chamber gradually becomes evenly distributed, and the high-temperature region is increasingly concentrated in the downstream region of the compression chamber. The results of this study provide a theoretical basis for the prototype's improvement and optimization by analyzing the scroll compressor's performance parameters in practical work. © 2024, The Authors. All rights reserved.

关键词： Numerical models

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Measurement of 3d Pavement Morphology Using Improved Binocular Reconstruction Under Structured Light Constraint Mechanism

SSRN

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SSRN 2024年

作者： Wang, Yuanyuan Zhang, Hengtong Shu, Haicheng Wang, Zhongren Xue, Jinshun Yang, Jianhua Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China School of Mechanical Engineering Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China Enterprise Technical Center Bridge Construction Group Co.Ltd Xiangyang Road Xiangyang441023 China School of Civil Engineering and Architecture Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China

For the special object of asphalt pavement, due to dark surface color, weak regional texture, and inconspicuous features points, traditional binocular vision is not ideal for measuring the three-dimensional (3D) morphology. To achieve accurate measurement of 3D pavement morphology, this paper introduced sine-encoded stripe structured light and explores a matching strategy that combines image spatial domain information with frequency domain phase information. The phase shift iterative matching algorithm under structured light constraint mechanism was proposed. A binocular reconstruction measurement system was subsequently constructed to evaluate the measurement accuracy of the proposed algorithm and the measurement effect in real scenarios. The results show that the constraint effect of structured light enhances the effective matching between pixels and improves the measurement accuracy. The maximum absolute deviation measured by the proposed algorithm is only 0.4 mm, which can meet the precision requirements of 3D pavement morphology measurement. © 2024, The Authors. All rights reserved.

关键词： Morphology

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Measurement of 3d Pavement Morphology Using Improved Binocular Reconstruction Under Structured Light Constraint Mechanism

SSRN

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SSRN 2024年

关键词： Morphology

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