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4th International Conference on Power and Electrical engineering, ICPEE 2023

作者： Zhang, Guifan Wang, Donglai Bo, Wen Liu, Zhenghan Zhao, Yan Guo, Rui Shi, Jiaqi Key Laboratory of Regional Multi-Energy System Integration and Control of Liaoning Province Shenyang Institute of Engineering Shenyang China State Grid Benxi Power Supply Company State Grid Liaoning Electric Power Co. Ltd. Benxi China School of Renewable Energy Shenyang Institute of Engineering Shenyang China

ISBN: (纸本)9789819716739

A trading strategy for energy storage power stations to participate in the market of the joint electric energy and frequency modulation ancillary services based on a two-layer market trading decision model is proposed in this paper. Firstly, a double-layer market trading decision model is constructed with the overall goal of maximizing the net income of the energy storage power station participating in the joint electric energy and frequency modulation ancillary service market. Then, the particle swarm optimization algorithm is used to solve the model by nested mixed integer linear programming method, and the optimal market trading strategy is obtained. Finally, an example analysis of the energy storage power station with rated parameters is carried out, and the market bidding situation is simulated. The energy storage participation in the market quotation and net income under the trading strategy in this paper and the conventional trading strategy are compared. The result of the example showed that the return rate of the energy storage power station under the trading strategy in this paper was increased by 8.14% compared with that of the conventional strategy. The operation life is extended by 51.1%, which verifies the superiority of the trading strategy in this paper. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Frequency modulation

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A Hierarchical Graph Search Method for Path Planning of Unmanned Ground Vehicle for Freight Transportation

A Hierarchical Graph Search Method for Path Planning of Unma...

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2024 IEEE International Conference on Unmanned systems, ICUS 2024

作者： Hu, Jianing Li, Zhen Guo, Sen Yao, Weiran School of Astronautics Harbin Institute of Technology Harbin China Beijing Electro-Mechanical Engineering Institute Beijing China CRRC Nanjing Puzhen Co. Ltd. Nanjing China National Key Laboratory of Complex System Control and Intelligent Agent Cooperation Beijing China

ISBN: (纸本)9798350384185

For the problem of collision volume change when forklift unmanned vehicles work in complex storage environments, a multi-level graph search path planning method is proposed. The first level is the path planning of the Unmanned Ground Vehicle (UGV) body, which uses the grid map and the A* algorithm to plan the path of the UGV transferring in the scene;the second level is the joint path planning of the UGV and the object being carried, to avoid overcomplicating this issue, the unmanned vehicle will be limited to pushing the cargo only forwards. The third level is the path planning when the unmanned vehicle carries multiple objects, which decomposes the whole scene into multiple sub-scenes, plans the paths of the unmanned vehicle in the sub-scenes separately, and searches for the optimal combination of sub-scenes. Higher level searches will invoke lower level algorithms and provide a virtual scene and target as input. The experimental results show that this multilevel path planning method is optimal and complete in solving the forklift unmanned vehicle for handling a single object, and can give a feasible solution for handling multiple objects. © 2024 IEEE.

关键词： Ground vehicles

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Exploring the Reform of Mechanical Drawing Teaching and Undergraduate Training Based on the 'Integration of Competition-Oriented Education and Industry-University Collaboration' 13

Exploring the Reform of Mechanical Drawing Teaching and Unde...

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13th International Conference on Educational and Information Technology, ICEIT 2024

作者： Runfeng, Zhang Yankun, Ming Zhenzhong, Liu Jianguo, Wu Xiaofei, Wang Yanfang, Sun School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin300384 China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education China Tianjin Hanhailanfan Marine Technology Co. Ltd. Tianjin300457 China

ISBN: (纸本)9798350372663

This study aims to explore the reform of mechanical drawing teaching and the undergraduate training model with the goal of cultivating high-quality mechanical engineering undergraduate students. Grounded in the concepts of 'synergy between science and education' and 'integration of competition-oriented education and industry-university collaboration,' this research places talent cultivation as the central focus, linking it with discipline construction and emphasizing scientific research. The study promotes the reform of a collaborative education mechanism known as 'integration of competition-oriented education and industry-university collaboration,' effectively establishing a multi-level and multi-dimensional undergraduate training model for mechanical engineering students that incorporates the 'dual mentor system' and integrates theory, practice, and application. To apply this model in teaching practice, this research has undertaken the reform of traditional engineering drawing education, specifically addressing the issue of the gap between theory and practice in conventional teaching approaches. The proposed training program not only facilitates the development of innovative mechanical engineering professionals but also offers insights for the reform of undergraduate teaching models in the context of constructing 'new engineering disciplines'. © 2024 IEEE.

关键词： Competition

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Helicopter Rotor Fault Diagnosis based on IPSO and RVM 14

Helicopter Rotor Fault Diagnosis based on IPSO and RVM

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Si, Xiaoyi Zheng, Liang Zheng, Guo Wang, Jinglin Zhao, Zhenping Guo, Ziang School of Electronic Information Hangzhou Dianzi University Hangzhou China AVIC United Technology Center for Basic Research on Aircraft System Fault Diagnosis and Health Management Shanghai Institute of Aerospace Control Engineering Shangai China Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai Institute of Aerospace Control Engineering Shangai China

ISBN: (纸本)9798350301359

To address the issue of low accuracy in traditional rotor fault diagnosis during the helicopter rotor fault diagnosis process, this paper presents a fault diagnosis method based on the Improved Particle Swarm Optimization (IPSO) algorithm for Relevance Vector Machine (RVM). The fitness function of the IPSO algorithm is defined as the mean squared error between the predicted classification results obtained through cross-validation and the actual classification. The IPSO algorithm is used to search for the optimal width factor of the RVM kernel function and establish the fault diagnosis model. Through simulation experiments and comparisons with Particle Swarm Optimization (PSO) algorithm-based RVM and Improved Particle Swarm Optimization-based Support Vector Machine (SVM), it is demonstrated that this approach, compared to traditional rotor fault diagnosis methods, effectively improves the accuracy of fault recognition. © 2023 IEEE.

关键词： Fault Diagnosis Helicopter Rotor Improved Particle Swarm Optimization Relevance Vector Machine

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Structural Optimization of a Magnetically Operated Actuator Mechanism for 10kV Circuit Breaker 25

Structural Optimization of a Magnetically Operated Actuator ...

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25th IEEE China Conference on system Simulation Technology and its Application, CCSSTA 2024

作者： Liang, Chao Tian, He Zhao, Guanqiao Li, Jiangping Zhu, Ziliang Shen, Ruixuan Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China Tianjin Sanyuan Power Equipment Manufacturing Co. Ltd Tianjin China

ISBN: (纸本)9798350366600

As the demand for reliable power supply in power systems grows, ensuring the performance of circuit breaker operating mechanisms is crucial. This performance is pivotal to the stability of the power grid, the speed of fault recovery, and the equipment's lifespan. In this paper, we introduce a structural optimization plan for a new magnetic control operating mechanism designed for 10kV circuit breakers. Employing three-dimensional and mathematical modeling, complemented by finite element analysis with Maxwell software, we delved into an in-depth study of the mechanism's structure, performance, and materials. We further conducted a parametric design and comparative analysis of key components. The simulation results, which exclude the spring load, demonstrate that the optimized circuit breaker can achieve a closing velocity of 3.07 m/s, an electromagnetic force peaking at 2.7 kN, and a closure time minimized to 8.5 ms. These enhancements notably improve the mechanism's closing efficiency. Consequently, our research introduces a novel perspective to the field of reliability studies for magnetic control operating mechanisms. © 2024 IEEE.

关键词： Magnetic actuators

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Research on Leakage Inductance and Eddy Current Loss of Nanocrystalline High-Frequency Transformers 26

Research on Leakage Inductance and Eddy Current Loss of Nano...

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26th International Conference on Electrical Machines and systems, ICEMS 2023

作者： Liu, Yang Liu, Xue Yin, Zhenhuan Dong, Kan Cui, Dongdong Ma, Chi State Key Laboratory for Traction and Control System of EMU and Locomotive China Academy of Railway Science Corporation Limited Beijing China Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences China University of Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering Beijing China

ISBN: (纸本)9798350317589

High-frequency transformers are a vital component of isolated DC/DC converters, and its leakage inductance can be adjusted by changing the winding method of the two-phase windings. Nanocrystalline magnetic cores have been widely applied due to their advantages in high-saturation flux and high magnetic permeability. However, their quite high electrical conductivity can easily lead to appreciable eddy current loss. This paper investigates the mechanism behind the eddy current loss caused by leakage flux by varying the number of windings cross turns, and verifies through simulation that the eddy current loss of nanocrystalline high-frequency transformers increases with increasing leakage inductance. © 2023 IEEE.

关键词： Inductance

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Prediction of second-order rate constants between carbonate radical and organics by deep neural network combined with molecular fingerprints

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Chinese Chemical Letters 2022年第1期33卷 438-441页

作者： Peizhe Sun Huixin Ma Shangyu Li Hong Yao Ruochun Zhang School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard Department of Municipal and Environmental EngineeringSchool of Civil EngineeringBeijing Jiaotong UniversityBeijing 100044China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim Tianjin UniversityTianjin 300072China

Carbonate radical is among the most important environmental relevant reactive species which govern the transformation and fate of pharmaceutical contaminants(PCs).However,reaction rate constants between carbonate radical and most of the PCs have not been experimentally determined,and quantitative structural-activity relationships(QSARs)have not been established for rate *** study applied Max Min data processing method and used molecular fingerprints(MF)as the input of a deep neural network(DNN)to predict the rate constants between carbonate radical and organic *** parameters and the hyper-structure of the DNN were adjusted to yield satisfactory accuracy of rate *** vector length of 512 bits with radius of 1 for MF and 5 hidden layers gave the best *** optimized MaxMin-MF-DNN model was compared with some of the most commonly used QSARs and machine learning methods,including random data splitting,molecular descriptors,supporting vector machine,decision tree,*** showed that the MF-DNN model out-performed the other methods by more than 10%increase in prediction *** this MF-DNN model,we estimated reaction rates between carbonate radical and pharmaceuticals used in human medicine(1576)and veterinary practice(390).Among them,46 drugs were identified as fast-reacting compounds,suggesting the important relations of their environmental fate with carbonate radical.

关键词： Deep neural network Carbonate radical Molecular fingerprints QSAR Pharmaceuticals

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In-plane shear failure behavior and mechanical properties of SiC/SiC Composites 3

In-plane shear failure behavior and mechanical properties of...

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2024 3rd International Conference on Applied Mechanics and Advanced Materials, ICAMAM 2024

作者： Li, Tianshan Yu, Guoqiang Zhou, Shihao Zheng, Zhikang Gao, Xiguang Song, Yingdong Key Laboratory of Aero-Engine Thermal Environment and Structure Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China

Fiber-reinforced ceramic matrix composites, especially SiC/SiC composites, have the characteristics of lightweight, high strength, high-temperature resistance, etc., which are ideal structural candidates for aerospace vehicle components, in-plane shear performance is one of the important indicators to characterize the mechanical properties of materials and component assessment, this paper designs and processes the in-plane shear test pieces and test devices and methods to study the shear mechanical behavior under the mechanical properties and failure behavior of SiC/SiC ceramic-based fiber bundle composites are studied under shear mechanical behavior. The results show that matrix cracking and fiber fracture are the main failure modes, and there are two obvious phases in the specimen shear force-displacement curves, and fiber fracture is the main cause of strain in the specimen. © Published under licence by IOP Publishing Ltd.

关键词： Ceramic matrix composites

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Observer-Based control for Networked control systems Under Quantization and DoS Attacks 41

Observer-Based Control for Networked Control Systems Under Q...

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第41届中国控制会议

作者： Xiaodan Zhang Cong Zhang Feng Xiao Bo Wei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University School of Control and Computer Engineering North China Electric Power University

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

This paper addresses an observer-based control problem in networked control systems under denial-of-service(DoS)***,an observer is constructed to estimate the unmeasurable states in the sensor side.A quantization strategy with time-varying step sizes is designed for data transmission from the encoder to the *** to the existence of DoS attacks,not all transmission attempts are *** auxiliary system with prediction ability is designed to make a reasonable estimation for observer *** estimator is introduced to estimate the observer ***,some sufficient conditions in terms of quantization levels and DoS attack parameters are given to ensure the stability of the system by multiple Lyapunov ***,simulation results are provided to verity the effectiveness of the proposed methods.

关键词： Denial-of-service attacks networked control systems observer quantization

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Explosive Synchronization in Multilayer Networks With Inter-Layer Competition and Cooperation 41

Explosive Synchronization in Multilayer Networks With Inter-...

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第41届中国控制会议

作者： Lingyun Xie Feng Xiao Bo Wei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University School of Control and Computer Engineering North China Electric Power University

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

In recent years,the study of explosive synchronization(ES) has been extended to multilayer networks by using different *** this paper,the synchronous transition of multilayer networks with inter-layer competition and inter-layer cooperation is studied,and it is found that ES occurs in both two layers when the proportion of interlayer cooperation is large *** addition,we study ES separately in terms of oscillator dynamics and network *** experiments show that ES occurs independently of the natural frequency ***,as the average degrees of networks increase,the critical coupling strength ***,the robustness of the results is confirmed by changing the network topology of each layer.

关键词： Multilayer network explosive synchronization inter-layer competition inter-layer cooperation

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