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International Conference on Guidance, Navigation and control, ICGNC 2020

作者： Hu, Li-ping Liang, Xiao-long Zhang, Jia-qiang Bai, Peng Xie, Yi-xiang Aviation Swarm Technology and Operational Application Laboratory Air Traffic Control and Navigation College Air Force Engineering University Xi’an710051 China Shaanxi Key Laboratory of Meta-Synthesis for Electronic and Information System Xi’an710051 China Chinese People’s Liberation Army Chengde067501 China

ISBN: (纸本)9789811581540

In order to solve the practical problem that the traditional operational effectiveness evaluation method is difficult to effectively evaluate the new type of autonomous swarm operational effectiveness, this paper proposes an aviation swarm operational effectiveness evaluation method based on the practical needs of the future autonomous swarm operational effectiveness evaluation. Firstly, based on the hierarchical thinking, the operational effectiveness index system for aviation swarm was constructed. Secondly, using the exponential logarithm method, the evaluation model of aviation swarm operational effectiveness is established. Finally, the ground attack from aviation swarm is taken as an example to verify the proposed method. Simulation results show that the method proposed in this paper can measure the emergence of aviation swarm operation capabilities to a certain extent. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Aviation swarm Capability emergence Effectiveness evaluation

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Adaptive Cruise control of Virtual Coupled High-Speed Trains

Adaptive Cruise Control of Virtual Coupled High-Speed Trains

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2021 China Automation Congress, CAC 2021

作者： Wang, Di Cao, Yuan Su, Shuai State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University The Center of National Railway Intelligent Transportation System Engineering and Technology China Academy of Railway Sciences Beijing China School of Electric and Information Engineering Beijing Jiaotong University Beijing China Frontiers Science Center for Smart High-speed Railway System State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

ISBN: (纸本)9781665426473

The adaptive cruise formation control problem for multiple high-speed trains (MHSTs) with input, speed and minimum tracking distance constraints under virtual coupling (VC) is proposed in this paper. First, the dynamic equation of MHSTs is created based on the law of kinematics. The communication topology is modeled by graph theory. Next, the speed limit, minimum tracking distance with adjacent trains are dealt with by using the ideas of the potential function. The resistance and unknown disturbances are dealt with by using adaptive control. Then, a cruise control protocol for MHSTs to track the expected trajectory is designed. The Lyapunov theory is used to prove the system stability. Finally, numerical experiments are conducted, which illustrates that the control protocol is effective. © 2021 IEEE

关键词： Graph theory

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Mesh stiffness calculation and vibration analysis of the spur gear pair with tooth crack,considering the misalignment between the base and root circles

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International Journal of Mechanical system Dynamics 2021年第1期1卷 143-156页

作者： Jingyu Hou Shaopu Yang Qiang Li Yongqiang Liu Jiujian Wang School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijingChina State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuangChina School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuangChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangshaChina

An improved variable cross‐section cantilever beam model for evaluating the time‐varying mesh stiffness(TVMS)of the perfect gear tooth is developed in which the tooth number of driving gear is less than 42 and that of driven is more than *** TVMS obtained by the proposed method is compared with the result without considering the misalignment between the base circle and gear *** types of root crack models and changes inTVMS of 13‐crack levels are *** fault vibration characteristic of a single‐stage spur gear reducer with root crack is ana-lyzed and the correctness is qualitatively verified by the vibration signals of an experimental gearbox with crack or missing *** results presented in this paper are of great significance for a deep understanding of the possible causes of vibration and noise of gears and provide a theoretical foundation for the fault diagnosis of the gearbox.

关键词： backlash gear potential energy method time‐varying mesh stiffness(TVMS) tooth crack

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A Reachable Set-Based Train Safety Protection Method for Virtually Coupled Trains 27

A Reachable Set-Based Train Safety Protection Method for Vir...

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27th IEEE International Conference on Intelligent Transportation systems, ITSC 2024

作者： Liang, Jialei Chai, Ming Wang, Qi Xie, Dong Liu, Haoyuan Liu, Hongjie Zhang, Yong National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing100044 China Standards & Metrology Research Institute China Academy of Railway Sciences Limited Corporation Beijing100081 China Beijing Hollysys Co. Ltd. Beijing100081 China Crsc Research & Design Institute Group Co. Ltd Beijing China School of Traffic and Transportation Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9798331505929

Virtual coupling as an emerging technology has received many concerns due to its advantages of expanding railway transportation capacity and coupling flexibility according to transport demand. However, its application faces a major challenge of reducing the safe distance between trains without compromising safety. To address this issue, a relative operation-based train separation model (ROS+) has been proposed. The model reduces the safe distance between two trains by predicting the boundary of all potential time-position trajectories of the preceding train, which involves the reachability problem of a hybrid system. To reduce the range of the envelope that covers all time-position trajectories, the operation controller of the preceding train is formalized into a hybrid automaton whose reachable set can be computed. Several simulations have been designed to evaluate the performance of the model, and the results demonstrate that by applying the model, the safe distance between two virtually coupled trains can be reduced by an average of 6.48%. © 2024 IEEE.

关键词： Railroads

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A Feedforward PID control Approach for Reference Tracking of Virtually Coupled Train Set

A Feedforward PID Control Approach for Reference Tracking of...

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International Conference on Intelligent Transportation

作者： Xiaolin Luo Jingtong Gao Yang Zhang Xiao Han Hongjie Liu National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China Forest School of the Sacred Heart Bellevue WA United States of America Traffic Control Technology Co. Ltd. Beijing China

Virtual coupling has been widely studied recently due to its efficiency and flexibility. However, it is still a challenge for a virtually coupled train set to track arbitrary reference trajectories while keeping a stable formation. To solve this problem, this paper proposes a feedforward proportional-integral-derivative (PID) control approach for VCTS. We integrate feedforward, formation and PID controllers to achieve accurate reference tracking while guaranteeing a stable formation for VCTS. Local and string stability are rigorously proved through Lyapunov and frequency-domain analyses. Finally, the performance of our approach is verified in simulations and field experiments.

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RailEINet:A novel scene segmentation network for automatic train operation based on feature alignment

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engineering Applications of Artificial Intelligence 2024年 138卷

作者： Sun, Tao Guo, Baoqing Ruan, Tao Zhou, Xingfang Bai, Dingyuan School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China Collaborative Innovation Center of Railway Traffic Safety Beijing Jiaotong University Beijing100044 China Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong University Beijing100044 China

The primary prerequisite for realizing automatic train operation is endowing trains with the capability of independent environmental perception. The railway scene is notably intricate, encompassing elements such as tracks, poles and more. Scene segmentation aims to make a pixel-wise classification for a full perspective analysis of railway scene, which is geared to build a powerful automatic train perception system. The existing methods primarily emphasize the creation of multi-scale feature interaction mechanisms, where features at different levels are aggregated after the sampling operation. This operation neglects the differences in data among various features, which leads to the production of semantically ambiguous and unaligned features. This can significantly impact the segmentation results. To tackle this problem, we design two neural modules. Concretely, the Explicit Boundary Alignment (EBA) module is designed to utilize edge supervision to constrain direct alignment within the boundary regions among objects. This enables the refinement of edge details. Then, the Implicit Pyramid Alignment (IPA) module is designed to dynamically learn an offset map. This map, when combined with bilinear sampling operations, effectively mitigates the misalignment issues between multi-scale features. The two modules described above constitute a novel scene segmentation network tailored for railway scene perception, known as the Rail Scene-oriented Explicit-Implicit Feature Alignment Network (RailEINet). Extensive experiments are conducted to demonstrate the effectiveness of RailEINet. In particular, we achieve 66.22% mIoU on the wildly-used RailSem19 dataset and experimental results show that RailEINet can achieve excellent segmentation of various targets in railway scenarios. © 2024 Elsevier Ltd

关键词： Semantic Segmentation

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Integrating mobile and fixed monitoring data for high-resolution PM2.5 mapping using machine learning

arXiv

引用

arXiv 2025年

作者： Xu, Rui Yao, Dawen Pian, Yuzhuang Cao, Ruhui Fu, Yixin Yang, Xinru Gan, Ting Liu, Yonghong School of Intelligent Systems Engineering Sun Yat-sen University Guangdong Shenzhen518107 China Guangdong Provincial Key Laboratory of Intelligent Transportation System Sun Yat-Sen University Guangzhou510275 China Guangdong Provincial Engineering Research Center for Traffic Environmental Monitoring and Control Guangdong Guangzhou510275 China

Constructing high resolution air pollution maps at lower cost is crucial for sustainable city management and public health risk assessment. However, traditional fixed-site monitoring lacks spatial coverage, while mobile low-cost sensors exhibit significant data instability. This study integrates PM2.5 data from 320 taxi-mounted mobile low-cost sensors and 52 fixed monitoring stations to address these limitations. By employing the machine learning methods, an appropriate mapping relationship was established between fixed and mobile monitoring concentration. The resulting pollution maps achieved 500-meter spatial and 5-minute temporal resolutions, showing close alignment with fixed monitoring data (+4.35% bias) but significant deviation from raw mobile data (-31.77%). The fused map exhibits the fine-scale spatial variability also observed in the mobile pollution map, while showing the stable temporal variability closer to that of the fixed pollution map (fixed: 1.12±0.73%, mobile: 3.15±2.44%, mapped: 1.01±0.65%). These findings demonstrate the potential of large-scale mobile low-cost sensor networks for high-resolution air quality mapping, supporting targeted urban environmental governance and health risk mitigation. © 2025, CC BY.

关键词： Environmental monitoring

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Construction of Polar Code using Code Spectrum

Construction of Polar Code using Code Spectrum

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2022 International Conference on Frontiers of Communications, Information system and Data Science, CISDS 2022

作者： Wang, Yongsong Liu, Yinsheng Li, Rong Beijing Jiaotong University School of Electronic and Information Engineering Beijing10004 China Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Frontiers Science Center for Smart High-Speed Railway System Beijing10004 China Beijing Radio Monitoring Station Beijing10037 China

ISBN: (纸本)9781665464468

The construction of Polar code algorithm using reliability can be proved to be optimal under successive cancellation (SC) decoding algorithm, but for successive cancellation list (SCL) decoding algorithm, the construction method using reliability alone is not optimal. Based on the existing reliability construction method, this paper proposes a Polar code construction scheme which takes reliability and code spectrum into consideration, designs a new coding rule, and reduces the bit error rate (BER) without significantly increasing the coding complexity. Simulation results show that the proposed algorithm outperforms the original Polar code construction algorithm in SCL decoding. © 2022 IEEE.

关键词： Reliability

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Design and Implementation of Ground Station Software for UAV Swarm Considering Geo Fence

Design and Implementation of Ground Station Software for UAV...

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International Conference on Guidance, Navigation and control, ICGNC 2020

作者： Qi, Duo Liang, Xiao-long Li, Zhe Zhang, Jia-qiang Lei, Peng-fei Zhou, You-zhen Aviation Swarm Technology and Operational Application Laboratory Air Traffic Control and Navigation College Air Force Engineering University Xi’an710051 China Shaanxi Province Laboratory of Meta-Synthesis for Electronic and Information System Xi’an710051 China Fire Rescue Bureau Kunming Training Corps Kunming650200 China

ISBN: (纸本)9789811581540

With the increasing development of unmanned air vehicle (UAV) technology, the scale of UAV swarm becomes larger, which leads to a series of severe security problems such as unregistered flight and flying without order. In the light of the reality in swarm flight test, ground station software of UAV swarm is designed based on stay-in and stay-out geo fence. The main functions include data receiving and sending, mission planning and simulation, online monitoring and display, manipulation and emergency handling, and data collection and playback, etc. According to application scenarios, the model of geo fence uses common circle, rectangle and polygon model. If UAV approaches the geo fence boundary, it will react according to the three pre-made schemes proposed in this paper in order to avoid collision. The effectiveness of the ground station software is proved by a flight test in which 5 UAVs completed fire detection mission and threw water bombs autonomously. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Fences

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Consensus of Multi-Agent systems with Input Constraints Based on Distributed Predictive control Scheme

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Computers, Materials & Continua 2020年第3期62卷 1335-1349页

作者： Yueqi Hou Xiaolong Liang Lyulong He Jiaqiang Zhang Jie Zhu Baoxiang Ren National Key Laboratory of Air Traffic Collision Prevention Air Force Engineering UniversityXi’an710051China Shanxi Province Laboratory of Meta-Synthesis for Electronic and Information System Xi’an710051China Air Traffic Control and Navigation College Air Force Engineering UniversityXi’an710051China

Consensus control of multi-agent systems has attracted compelling attentions from various scientific communities for its promising *** paper presents a discrete-time consensus protocol for a class of multi-agent systems with switching topologies and input constraints based on distributed predictive control *** consensus protocol is not only distributed but also depends on the errors of states between agent and its *** focus mainly on dealing with the input constraints and a distributed model predictive control scheme is developed to achieve stable consensus under the condition that both velocity and acceleration constraints are included *** acceleration constraint is regarded as the changing rate of velocity based on some reasonable assumptions so as to simplify the *** analysis shows that the constrained system steered by the proposed protocol achieves consensus asymptotically if the switching interaction graphs always have a spanning *** examples are also provided to illustrate the validity of the algorithm.

关键词： Multi-agent systems consensus input constraints model predictive control distributed control switching interaction graphs

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