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Two-Stage OD Flow Prediction for Emergency in Urban Rail Transit

IEEE Transactions on Intelligent Transportation systems 2024年第1期25卷 920-928页

作者： Zhu, Guangyu Ding, Jiacun Wei, Yun Yi, Yang Xu, Sendren Sheng-Dong Wu, Edmond Q. Beijing Jiaotong University Key Lab. of Transport Industry of Big Data Application Technologies for Comprehensive Transport The Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Beijing100044 China Beijing Mass Transit Railway Operation Corporation Ltd. Beijing100014 China Yangzhou University College of Information Engineering Yangzhou225127 China National Taiwan University of Science and Technology Automation and Control Center The Graduate Institute of Automation and Control Taipei106335 Taiwan Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China The Shanghai Engineering Research Center of Intelligent Control and Management Department of Automation Shanghai200240 China

Urban rail transit (URT) is vulnerable to natural disasters and social emergencies including fire, storm and epidemic (such as COVID-19), and real-time origin-destination (OD) flow prediction provides URT operators with important information to ensure the safety of URT system. However, hindered by the high dimensionality of OD flow and the lack of supportive information reflecting the real-time passenger flow changes, study in this area is at the beginning stage. A novel model consisting of two stages is proposed for OD flow prediction. The first stage predicts the inflows of all stations by Long Short-Term Memory (LSTM) in real time, where the dimension is reduced compared with predicting OD flows directly. In the second stage, the notion of separation rate, namely, the proportion of inbound passengers bounding for another station, is estimated. Finally, The OD flow is predicted by multiplying the inflow and separation rate. Experiments based on Hangzhou Metro dataset show the proposed model outperforms the contrast model in weighted mean average error (WMAE) and weighted mean square error (WMSE). Results also suggest that the proposed prediction model performs better on weekdays than on weekends, and with greater accuracy on larger OD flows. © 2000-2011 IEEE.

关键词： Forecasting

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A VIO-Based Localization Approach in GPS-denied Environments for an Unmanned Surface Vehicle 8

A VIO-Based Localization Approach in GPS-denied Environments...

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8th IEEE International Conference on Advanced Robotics and Mechatronics, ICARM 2023

作者： Liu, Xinze Hu, Zhihuan Sun, Zhijian Lu, Jinhui Xie, Wei Zhang, Weidong Shanghai Jiao Tong University Department of Automation Shanghai200240 China Crossocean of Suzhou Technology No. 218 East Qingdao Road Suzhou China National Engineering Research Center of Ship & Shipping Control System

ISBN: (纸本)9798350300178

In this paper, we propose a visual inertial odometer (VIO)-based localization approach for USV in GPS-denied environments. Considering the difficulty in capturing reliable features on the water surface, we set the camera's pitch angle properly to capture high-quality features, including points and lines, distributed on the bridge wall. Our work is based on the state-of-the-art simultaneous localization and mapping (SLAM) framework, VINS-Fusion. The point and line features observed by the left and right cameras are both added into the nonlinear optimization system along with the inertial measurement unit (IMU) measurement between frames. Through the joint optimization of landmark information and system state variables, the precise positioning of USV is realized. To validate the effectiveness of the proposed localization method, experimental results are presented and analyzed. © 2023 IEEE.

关键词： Cameras

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Accurate MTPA control Based on Ferrari Method for IPMSM with Partial Derivative Term Calculation 27

Accurate MTPA Control Based on Ferrari Method for IPMSM with...

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27th International Conference on Electrical Machines and systems, ICEMS 2024

作者： Li, Yiyang Gu, Xin Wang, Zhiqiang Guo, Liyan Chen, Wei Li, Xinmin Li, Chen School of Electronics and Information Engineering Tiangong University Tianjin China School of Electrical Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin China National Local Joint Engineering Research Center of Electrical Machine System Design and Manufacturing China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China

ISBN: (纸本)9784886864406

Even if the exact motor parameters are known, the MTPA strategy cannot obtain precise maximum torque per ampere (MTPA) points under large current amplitude because the partial derivative of inductance to current is ignored in the modeling process. In view of this, the MTPA mathematical model considering the partial derivative of inductance to current is established in this paper, and the MTPA point tracking error caused by ignoring the partial derivative in the modeling process based on Ferrari method is analyzed. Then, an offline-online combined method for calculating the partial derivative term is proposed to compensate the MTPA tracking error. On this basis, an MTPA control strategy based on Ferrari method considering the partial derivative of inductance to current is proposed. Experiment to verify the feasibility and effectiveness of the proposed method. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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Data-driven technology of fault diagnosis in railway point machines:review and challenges

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Transportation Safety and Environment 2022年第4期4卷 19-32页

作者： Xiaoxi Hu Yuan Cao Tao Tang Yongkui Sun State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China National Engineering Research Center of Rail Transportation Operation Control System Beijing Jiaotong UniversityBeijing 100044China.

Safety and reliability are absolutely vital for sophisticated Railway Point Machines(RPMs).Hence,various kinds of sensors and transducers are deployed on RPMs as much as possible to monitor their behaviour for detection of incipient faults and anticipation using data-driven *** paper firstly analyses and summarizes six RPMs’characteristics and then reviews the data-driven algorithms applied to fault diagnosis in RPMs during the past *** provides not only the process and evaluation metrics but also the pros and cons of these different ***,regarding the characteristics of RPMs and the existing studies,eight challenging problems and promising research directions are pointed out.

关键词： Railway point machine(RPM) fault diagnosis data-driven technology condition monitoring

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Rail fastener detection of heavy railway based on deep learning

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High-Speed Railway 2023年第1期1卷 63-69页

作者： Yuan Cao Zihao Chen Tao Wen Clive Roberts Yongkui Sun Shuai Su National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering Bejing Jiaotong UniversityBeijing 100044China Birmingham Centre for Railway Research and Education University of BirminghamBirmingham B152TTUK Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong UniversityBeijing 100044China

Image detection based on machine learning and deep learning currently has a good application prospect for railway fault diagnosis,with good performance in feature extraction and the accuracy of image localization and good classification *** improve the speed of locating small target objects of fasteners,the YOLOv5 framework model with faster algorithm speed is *** improve the classification accuracy of fasteners,YOLOv5-based heavy-duty railway rail fastener detection is *** anchor size is modified on the original basis to improve the attention to small targets of *** CBAM(Convolutional Block Attention Module)module and TPH(Transformer Prediction Head)module are introduced to improve the speed and accuracy *** rail fasteners are divided into 6 *** comparisons show that before the improvement,the MAP@0.5 value of all categories are close to the peak of 0.989 after the epoch of 150,and the F1 score approaches 1 with confidence in the interval(0.2,0.95).The improved mAP@0.5 value approached the highest value of 0.991 after the epoch of 75,and the F1 score approached 1 with confidence in the interval(0.01,0.95).The experiment results indicate that the improved YOLOv5 model proposed in this paper is more suitable for the task of detecting rail fasteners.

关键词： Rail fasteners Fault diagnosis Heavy haul railways Deep learning YOLO5

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Forming Circle Formations of Multi-agent systems Under Actuator Faults 5th

Forming Circle Formations of Multi-agent Systems Under Actu...

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5th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2021

作者： Liu, Jiajun Ru, Xinfeng Xia, Weiguo Wang, Chen China National Aeronautical Radio Electronic Research Institute and National Key Laboratory of Science and Technology on Avionics System Integration Shanghai China Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education and School of Control Science and Engineering Dalian University of Technology Dalian China National Engineering Research Center of Software Engineering and the State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing China

ISBN: (纸本)9789811939976

A distributed fault-tolerant formation control law is designed in this paper for multi-agent systems under external disturbances and actuator faults including time-varying loss of effectiveness faults. The initial position of each agent is already on a circle and the control purpose is to form a desired formation on this circle. Based on this local information, a distributed adaptive formation control law is designed by employing the congelation of variables method to deal with time-varying actuator faults. Finally, a simulation example is given to verify the effectiveness of the adaptive fault-tolerant control design method. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Multi agent systems

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On the crashworthiness of aperiodic chiral mechanical metamaterials: Design and modeling method

On the crashworthiness of aperiodic chiral mechanical metama...

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Chinese Materials Conference 2022-2023

作者： Xu, Weiyun Zhang, Hanyu Liu, Zhao Zhu, Ping The State Key Laboratory of Mechanical System and Vibration National Engineering Research Center of Automotive Power and Intelligent Control School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China School of Design Shanghai Jiao Tong University Shanghai China

Chiral mechanical metamaterial has become topical in energy absorption for the unusual compression-to-twist deformation determined by the asymmetric chirality geometry of their microstructures. However, the insufficient research on the dynamic crash behavior with high nonlinearity and the lack of efficient design and modeling method have blocked the development of chiral mechanical metamaterials considering crashworthiness. In this work, the structure-property relationship of chiral mechanical metamaterials under medium-strain-rate impact was systematically investigated. We proposed an aperiodic framework considering additive manufacturing which enabled both the ordered and disordered chiral mechanical metamaterials utilizing a screw-theory-based assembly rule. The strut components had variable cross-sections and the joints were fillet-enhanced in order to improve the compressive performance. Meanwhile, the corresponding efficient modeling method for finite element analysis (FEA) was introduced. The constitutive relation, damage criteria, and damage revolution of the 316L stainless steel were established considering strain rate effect. Finally, the deformation mechanisms and energy absorbing capabilities of the proposed chiral mechanical metamaterials were demonstrated and discussed based on the mechanical behaviors and the proposed chirality indexes. The numerical results indicated that the proposed design and modeling method provided an effective paradigm for the crashworthiness design of light-weight materials and structures, facilitating the further applications in fields of automobile, civil engineering, aerospace, etc. © Published under licence by IOP Publishing Ltd.

关键词： Metamaterials

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research on a system controller Fault Detection Method Based on Correlation Matrix 12

Research on a System Controller Fault Detection Method Based...

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12th International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2022

作者： Wang, Dong Dong, Wenping Liu, Litao Wang, Weirong Luo, Jiang Wang, Kui Environment control and life support system Astronaut Research and Training Center of China Beijing China National Key Laboratory of Human Factors Engineering Beijing China

ISBN: (纸本)9781839538360

In this paper, based on the correlation matrix, the fault detection method of controller is studied based on the fault diagnosis characteristics of environment control and life support system(ECLSS). Combined with the characteristics of actual system fault diagnosis, the reasons for the existence of the feedback loop are analyzed, the different diagnostic effects caused by voltage and current detection methods are compared, and the detection method of breaking the feedback loop by manual testing is proposed. Through modeling and analysis, complete design ideas and methods are provided for improving testability design of controller products, which can help guide Built-In-Test(BIT) design of controllers. © 2022 IEEE.

关键词： Fault detection

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Study on Testability Design of Gas Purification Subsystem Based on Correlation Matrix 12

Study on Testability Design of Gas Purification Subsystem Ba...

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12th International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2022

作者： Wang, Dong Bian, Qiang Luo, Yabin Zhang, Yuan Tang, Bin Zhang, Yongping Environment Control and Life Support System Astronaut Research and Training Center of China Beijing China National Key Laboratory of Human Factors Engineering Beijing China

ISBN: (纸本)9781839538360

Testability modeling and analysis play an increasingly important role in improving the level of testability design of products. Based on the correlation matrix, the testability analysis is carried out with a gas purification subsystem as an example. Aiming at the complex feedback loop caused by the external condition test and the cycle, a method of disconnecting the complex feedback loop is proposed, which improves the testability and fault diagnosis ability of the subsystem, and provides a method guidance for the testability design of other systems. © 2022 IEEE.

关键词： Failure analysis

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Optimization of operating strategy for smooth operation of heavy haul train 7

Optimization of operating strategy for smooth operation of h...

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2022 7th International Conference on Electronic Technology and Information Science, ICETIS 2022

作者： Lan, Hongyong Liang, Ziyue Yu, Huazhen Tai, Guoxuan Huang, Youneng School of Electronics and Information Engineering Beijing Jiaotong University Beijing China National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China

ISBN: (纸本)9783800757794

To address the difficulty of train operating on the long steep down-slopes, this paper proposes an optimization method of operating strategy for smooth operation of heavy haul train. Taking the practical operational regulations of heavy haul train into consideration, an optimization model of smooth operation is established with the optimization objective of minimizing the in-train force. Then, the multi-population strengthen elitist genetic algorithm with opposition-based learning initialization strategy (MSEGA-OBL) is proposed to solve the optimization problem of operating strategy. Based on the actual field data of Shuohuang railway, the simulation experiments are carried out to obtain the optimal driving curve. The simulation results demonstrate the effectiveness of the proposed method. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Genetic algorithms

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