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An algorithm for train delay propagation on double-track railway lines under FCFS management

Frontiers of Engineering Management 2024年第4期11卷 721-733页

作者： Junfeng MA Chaoyu TANG Wentao XU Shan MA Huawei WU School of Automation Central South UniversityChangsha 410083China Hubei Key Lab of Power System Design and Test for Electrical Vehicle Hubei University of Arts and ScienceXiangyang 441053China

This paper proposes an algorithm for train delay propagation on double-track railway lines under First-Come-First-Serve(FCFS)*** objective is to handle the challenges faced by the dispatchers as they encounter train delays and their effects on the functioning of the railway *** assume that the location and duration of disruptions are known,which are important inputs to the *** data enables calculation of delays experienced by each affected *** method analyzes factors such as train schedules,track capacities,and operation constraints to assess the manner in which delays would get propagated along railway *** indicators of delay propagation,consisting of the number of delayed trains and stations,disruption settling time,and cumulative delays,are ***,a numerical example is given to explain the practical application of this ***,we show that a tool like this would facilitate the dispatchers in managing and rescheduling trains in case of delays and will be improving resilience and efficiency of railway operations.

关键词： train delay propagation FCFS management cumulative delays

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Aeroservoelastic induced drag modelling and minimization for the T-FLEX demonstrator

Aeroservoelastic induced drag modelling and minimization for...

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AIAA SciTech Forum and Exposition, 2023

作者： Meddaikar, Yasser M. Krüger, Wolf R. Kier, Thiemo Bartasevicius, Julius Yu, Fanglin Vanek, Bálint Olgyay, Ábel Takarics, Béla Loads Analysis and Aeroelastic Design DLR - Institute of Aeroelasticity Bunsenstrasse 10 Goettingen37073 Germany Department of System Dynamics and Control DLR - Institute of System Dynamics and Control Weßling82234 Germany Institute of Aircraft Design Technical University of Munich Boltzmannstraße 15 Garching/München85748 Germany Systems and Control Lab SZTAKI Kende u. 13-17 Budapest1111 Hungary Computer and Automation Research Institute SZTAKI Kendeu. 13-17 Budapest1111 Hungary

ISBN: (数字)9781624106996

ISBN: (纸本)9781624106996

This work is part of the on-going EU-project FliPASED, wherein flight tests using a UAV demonstrator (T-FLEX) and a multi-disciplinary optimization (MDO) exercise involving the aeroservoelastic optimization of UAV demonstrator and commercial-scale aircraft wings are performed. In this paper, several potential flow methods have been applied to estimate induced drag of the T-FLEX aircraft, followed by solving an optimization problem to minimize it using the control surfaces on the wings. The results from this study were used in the retrofit design of a pair of manufactured wings - the number and position of the control surfaces and the wing selection. In a next step, the developed tools will form the basis for a controller that will minimize induced drag, which will be tested on the T-FLEX testbed. The developed tools and the validated results will also be used within a broader MDO task involving optimization studies on a commercial short/medium range aircraft. © 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Wings

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Learning Pre-Grasp Manipulation of Flat Objects in Cluttered Environments using Sliding Primitives

Learning Pre-Grasp Manipulation of Flat Objects in Cluttered...

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IEEE International Conference on Robotics and automation (ICRA)

作者： Jiaxi Wu Haoran Wu Shanlin Zhong Quqin Sun Yinlin Li State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing China Department of Automation University of Science and Technology of China Heifei China State Key Laboratory of Management and Control for Complex System Institute of Automation Chinese Academy of Science Beijing China Science and Technology on Thermal Energy and Power Laboratory Wuhan China

Flat objects with negligible thicknesses like books and disks are challenging to be grasped by the robot because of the width limit of the robot's gripper, especially when they are in cluttered environments. Pre-grasp manipulation is conducive to rearranging objects on the table and moving the flat objects to the table edge, making them graspable. In this paper, we formulate this task as Parameterized Action Markov Decision Process, and a novel method based on deep reinforcement learning is proposed to address this problem by introducing sliding primitives as actions. A weight-sharing policy network is utilized to predict the sliding primitive's parameters for each object, and a Q-network is adopted to select the acted object among all the candidates on the table. Meanwhile, via integrating a curriculum learning scheme, our method can be scaled to cluttered environments with more objects. In both simulation and real-world experiments, our method surpasses the existing methods and achieves pre-grasp manipulation with higher task success rates and fewer action steps. Without fine-tuning, it can be generalized to novel shapes and household objects with more than 85% success rates in the real world. Videos and supplementary materials are available at https://***/view/pre-grasp-sliding.

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automation Software Architecture in CPPS - Definition, Challenges and Research Potentials

Automation Software Architecture in CPPS - Definition, Chall...

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Industrial Cyber-Physical systems (ICPS)

作者： Birgit Vogel– Heuser Eva– Maria Neumann Juliane Fischer Marga Marcos Elisabet Esté vez Esté vez Giacomo Barbieri Lisa Sonnleithner Rick Rabiser Institute of Automation and Information Systems TUM School of Engineering and Design Core Member of MDSI Member of MIRMI Technical University of Munich Garching Germany Institute of Automation and Information Systems TUM School of Engineering and Design Technical University of Munich Garching Germany Department of Automatic Control and System Engineering ETSI Bilbao Basque Country University Bilbao Spain Electronics and Automation Engineering Department University of Ja&#x00E9 n Ja&#x00E9 n Spain Department of Mechanical Engineering Universidad de los Andes Bogot&#x00E1 Colombia CDL VaSiCS LIT CPS Lab Johannes Kepler University Linz Linz Austria

The importance of a mature, maintainable design of automation software in Cyber-Physical Production systems (CPPS) is continuously increasing since a growing proportion of the system functionality is implemented via software. As a result, system complexity is shifting more and more towards the software side. Quality characteristics such as flexibility, maintainability, and extensibility, whose importance is increasing in the context of Industry 4.0, are thus becoming harder to achieve. These challenges can only be solved through sound architectural design. While there is a common understanding of good software architecture and appropriate methods to achieve it in computer science, a suitable architecture definition for automation software that takes all relevant factors into account is still missing in the field of CPPS. Therefore, based on a workshop with international scientists with different perspectives on CPPS, this paper presents influencing factors on automation software architecture. On this basis, a joint definition for software architecture in CPPS, as well as challenges and future research potentials, are derived.

关键词： Computer science Production systems Software architecture Conferences Computer architecture Cyber-physical systems Software

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A unified leader-follower scheme for mobile robots with uncalibrated on-board camera

A unified leader-follower scheme for mobile robots with unca...

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IEEE International Conference on Robotics and automation (ICRA)

作者： Dejun Guo Hesheng Wang Weidong Chen Ming Liu Zeyang Xia Kam K. Leang DARC (Design Automation Robotics & Control) Lab University of Utah Robotics Center Salt Lake City Utah USA State Key Laboratory of Robotics and System (HIT) Key Laboratory of System Control and Information Processing Ministry of Education of China Department of Automation Shanghai Jiao Tong University Shanghai China Department of Electronics and Computer Engineering Hong Kong University of Science and Technology Hong Kong China Institute of Biomedical and Health Engineering Chinese Academy of Sciences Shenzhen China

This paper studies the problem of image-based leader-follower formation control for mobile robots, where the controller is designed independently of the leader's motion. An adaptive control scheme, which is suitable for both omnidirectional and perspective cameras, is proposed. The proposed approach avoids the need for accurate calibration of the extrinsic parameters of the omnidirectional camera as well as the intrinsic and extrinsic parameters of perspective camera. Additionally, the coefficients of the plane where the feature point moves relative to the camera frame can be uncertain. These uncertain constant parameters are estimated using an adaptive estimator. Uniform Semi-global Practical Asymptotic Stability (USPAS) of the system is shown using the Lyapunov approach. Experimental results are presented to demonstrate the effectiveness of the proposed control scheme.

关键词： Cameras Robot vision systems Kinematics Mobile robots Calibration automation

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Multi-sensor fusion based pose estimation for unmanned aerial vehicles on ships

Multi-sensor fusion based pose estimation for unmanned aeria...

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International Conference on Information and automation (ICIA)

作者： Wei Zheng Bing Yan Zengfu Wang National Key LAB of Sci. and Tech. on Steam Power System for NS Wuhan Second Ship Design and Research Institute Wuhan China Department of Automation University of Science and Technology of China Hefei Province China

ISBN: (纸本)9781509041039

Multi-sensor fusion based pose estimation for UAVs (unmanned aerial vehicles) on ships was proposed in this paper. For take-off and landing of UAVs on ships, the novel artificial landmark was presented which could obtain accurate unique result and eliminate the pose ambiguity effectively. IMU data was effectively employed for pose estimation. EPnP algorithm was performed to get the initial estimation. Then the modified RPP method was proposed which employed both IMU data and vision information. Based on the planar target, the accurate and robust pose estimation of the quadrotor was obtained. The results of pose estimation were analysed and verified by the simulation and real experiments.

关键词： Pose estimation Marine vehicles Cameras Unmanned aerial vehicles Three-dimensional displays Iterative methods

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Investigation on the commutation process of 20MVA IGCT-based NPC/H-bridge inverter 17

Investigation on the commutation process of 20MVA IGCT-based...

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17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015

作者： Pei, Yang Chongjian, Li Shuai, Dong Automation Research Design Institute of Metallurgical Industry Beijing100071 China Hybrid Process Industry Automation System and Equipment Technology State Key Lab Beijing100071 China

ISBN: (纸本)9789075815221

This paper investigates the topology of 20MVA IGCT-based high power NPC/H-bridge inverter. The detailed structure design is presented. The commutation processes of IGCT equivalent circuit and NPC leg are analyzed, which are influenced by the snubber circuit and the characteristic of diode and IGCT. The system simulation model is built in PSIM. The simulation and experimental results validate the correctness of theoretical analysis. © 2015 EPE Association and IEEE.

关键词： Equivalent circuits

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Memory fast-forward: A low cost special function unit to enhance energy efficiency in GPU for big data processing 15

Memory fast-forward: A low cost special function unit to enh...

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design, automation and Test in Europe Conference and Exhibition

作者： Eunhyeok Park Junwhan Ahn Sungpack Hong Sungjoo Yoo Sunggu Lee Embedded System Architecture Lab POSTECH Design Automation Lab Seoul National University Oracle Labs

ISBN: (纸本)9783981537048

Big data processing, e.g., graph computation and MapReduce, is characterized by massive parallelism in computation and a large amount of fine-grained random memory accesses often with structural localities due to graph-like data dependency. Recently, GPU is gaining more and more attention for servers due to its capability of parallel computation. However, the current GPU architecture is not well suited to big data workloads due to the limited capability of handling a large number of memory requests. In this paper, we present a special function unit, called memory fast-forward (MFF) unit, to address this problem. Our proposed MFF unit provides two key functions. First, it supports pointer chasing which enables computation threads to issue as many memory requests as possible to increase the potential of coalescing memory requests. Second, it coalesces memory requests bound for the same cache block, often due to structural locality, thereby reducing memory traffics. Both pointer chasing and memory request coalescing contribute to reducing memory stall time as well as improving the real utilization of memory bandwidth, by removing duplicate memory traffics, thereby improving performance and energy efficiency. Our experiments with graph computation algorithms and real graphs show that the proposed MFF unit can improve the energy efficiency of GPU in graph computation by average 54.6% at a negligible area cost.

关键词： Graphics processing units Instruction sets Registers Memory management Arrays Big data

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A multi-agent based reputation mechanism in clustered network control system with malicious node

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Gongcheng Kexue Xuebao/Chinese Journal of Engineering 2015年 37卷 1-7页

作者： Zhang, Yun-Gui Zhang, Quan Wang, Fei-Fei Sun, Xi-Yan Hybrid Process Industry Automation System and Equipment Technology State Key Lab Automation Research and Design Institute of Metallurgical Industry Beijing100071 China

In the network control system (NCS), the nodes are invaded to become the malicious nodes, due to the internet, malicious or accidental intrusion operations by the control system operator, or other reasons, thus affecting the normal operation of the system. Firstly, the multi-agent method is used to model and analyze the NCS, which confirms the structure model of the controller, sensor and actuators as autonomous agents with appropriate conduct rules. Then each cluster and its control units are assessed on credit based on the structure model of multi-agent to measure the probability of obtaining tasks of each cluster. Finally, the paper the credit mechanism based on the assessment of the credit and multi-agent clustering control system, and makes a comparison between the situations with and without credit mechanism. The result shows that a credit mechanism can effectively improve the safety and the reliability of the system. © All right reserved.

关键词： Control systems

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Research on the control technique of high power three-level PWM rectifier with IGCTs 17

Research on the control technique of high power three-level ...

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2014 17th International Conference on Electrical Machines and systems, ICEMS 2014

作者： Jun, Jiang Chongjian, Li Chengsheng, Wang Wei, Duan Pei, Yang Automation Research and Design Institute of Metallurgical Industry Beijing China Hybrid Process Industry Automation System and Equipment Technology State Key Lab China Beijing Aritime Intelligent Control Co. LTD China

ISBN: (纸本)9781479951611

This paper is based on the high power three-level back-to-back converter system with IGCTs as its application platform. Three-phase voltage source rectifier (VSR) space vector PWM (SVPWM) control system using feedforward decoupling control strategy is built in the software of PSIM. When this SVPWM rectifier is in practical control, problems of harmonics and neutral point voltage deviation, as well as starting impulse current occur. After detailed analysis, solutions are provided respectively to each problem. Then a new PWM control method is designed to improve the situation overall. That is to say, this method can effectively eliminate even-order harmonics, balance neutral point voltage and lower the starting impulse current. So the system has a better performance which is proved by PSIM simulations and experimental waveforms. © 2014 IEEE.

关键词： Vector spaces

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