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Predicting the critical behavior of complex dynamic systems via learning the governing mechanisms

Chaos, Solitons & Fractals 2025年 198卷

作者： Xiangrong Wang Dan Lu Zongze Wu Weina Xu Hongru Hou Yanqing Hu Yamir Moreno College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China Hangzhou International Innovation Institute Beihang University Hangzhou China School of Computer Science and Engineering Beihang University Beijing China Department of Statistics and Data Science Southern University of Science and Technology Shenzhen China Institute for Biocomputation and Physics of Complex Systems (BIFI) University of Zaragoza Zaragoza 50018 Spain Department of Theoretical Physics University of Zaragoza Zaragoza 50009 Spain

Critical points separate distinct dynamical regimes of complex systems, often delimiting functional or macroscopic phases in which the system operates. However, the long-term prediction of critical regimes and behaviors is challenging given the narrow set of parameters from which they emerge. Here, we propose a framework to learn the rules that govern the dynamic processes of a system. The learned governing rules further refine and guide the representative learning of neural networks from a series of dynamic graphs. This combination enables knowledge-based prediction for the critical behaviors of dynamical networked systems. We evaluate the performance of our framework in predicting two typical critical behaviors in spreading dynamics on various synthetic and real-world networks. Our results show that governing rules can be learned effectively and significantly improve prediction accuracy. Our framework demonstrates a scenario for facilitating the representability of deep neural networks through learning the underlying mechanism, which aims to steer applications for predicting complex behavior that learnable physical rules can drive.

关键词： Critical behavior of complex dynamic systems Graph neural networks Spreading dynamics

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One-leg stance of humanoid robot using active balance control

arXiv

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arXiv 2021年

作者： Tran, Tri Duc Luu, Anh Khoa Lanh Duong, Van Tu Nguyen, Huy Hung Nguyen, Tan Tien National Key Laboratory of Digital Control and System Engineering Ho Chi Minh City University of Technology VNU-HCM Hochiminh city Viet Nam The Department of Mechatronics Ho Chi Minh City University of Technology VNU-HCM Hochiminh city Viet Nam Faculty of Electronics and Telecommunication Saigon University Viet Nam

The task of self-balancing is one of the most important tasks when developing humanoid robots. This paper proposes a novel external balance mechanism for humanoid robot to maintain sideway balance. First, a dynamic model of the humanoid robot with balance mechanism and its simplified model are introduced. Secondly, a backstepping-based control method is utilized to split the system into two sub-systems. Then, a minimum observer-based controller is used to control the first sub-system. Since the second sub-system has unknown parameters, a model reference adaptive controller (MRAC) is used to control it. The proposed design divides the walking and balancing into two separated tasks, allowing the walking control can be executed independently of the balancing control. Furthermore, the use of the balance mechanism ensures the humanoid robot's hip movement does not exceed the threshold of a human when walking. Thus, making the overall pose of the humanoid robot looks more natural. An experiment is carried out on a commercial humanoid robot known as UXA-90 to evaluate the effectiveness of the proposed method. Copyright © 2021, The Authors. All rights reserved.

关键词： Anthropomorphic robots

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State-feedback control for continuous-time LPV systems with polynomial vector fields ⁎

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IFAC-PapersOnLine 2020年第2期53卷 6299-6304页

作者： Gabriel O. Ferreira Valter J.S. Leite Márcio J. Lacerda Control and Modelling Group (GCOM) Department of Electrical Engineering Federal University of São João del-Rei São João del-Rei MG 36307-352 Brazil Department of Mechatronics Engineering / CEFET-MG Campus Divinópolis Divinópolis MG 36307-352 MG Brazil

This paper is concerned with the design of state-feedback controllers for Linear Parameter Varying (LPV) polynomial continuous-time systems. The vector field presents polynomial dependence on the states. Two synthesis conditions are proposed, the first one considers arbitrary rates of variation in the time-varying parameters, while the second one provides LPV controllers that are constructed based on a smoothed approximation of the time-varying parameter. The sum of squares matrix decomposition is employed to solve the proposed conditions. The L 2 gain is also considered to give a robustness measure of the proposed controllers. The results are illustrated with examples from the literature.

关键词： Stabilization time-varying systems polynomial systems sum of squares

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Retraction notice to “Effects of surface roughness with the spherical shape on the fluid flow of argon atoms flowing into the microchannel, under boiling condition using molecular dynamic simulation” [J. Mol. Liq. 297 (2020) 111650]

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Journal of Molecular Liquids 2025年 421卷

作者： Yeping Peng Majid Zarringhalam Azeez A. Barzinjy Davood Toghraie Masoud Afrand Shenzhen Key Laboratory of Electromagnetic Control College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China Department of Mechanical Engineering South Tehran Branch Islamic Azad University Tehran Iran Physics Education Department Tishk International University TIU Erbil Kurdistan Region Iraq Physics Department College of Education Salahaddin University-Erbil Kurdistan Region Iraq Department of Mechanical Engineering Khomeinishahr Branch Islamic Azad University Khomeinishahr Iran Laboratory of Magnetism and Magnetic Materials Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Vietnam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Vietnam

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control System for Spinning Machine Induction Motor using PLC 1

Control System for Spinning Machine Induction Motor using PL...

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1st International Conference on Electrical, Communication and Computer engineering, ICECCE 2019

作者： Awais, Muhammad Hassan, Syed Zulqadar Kamal, Tariq Zahoor, Amir Khan, Muhammad Abbas Riaz, Muhammad Tanveer National University of Computer and Emerging Sciences Department of Electrical Engineering Chiniot35400 Pakistan Sakarya University Faculty of Engineering Department of Electrical and Electronics Engineering Serdivan/Sakarya54050 Turkey Balochistan University of Information Technology Engineering Management Sciences Quetta Balochistan87650 Pakistan University of Engineering Technology Department of Mechatronics and Control Engineering Faisalabad38000 Pakistan

ISBN: (纸本)9781728138251

Programmable logic controllers (PLCs) are at the vanguard of industrial automation. In this article a PLC based control system is design and later on implemented on an induction motor used inside textile industry in spinning plant, further it can be implemented on any other industry. Also, it is implemented by designing hardware circuitry for induction motor's speed control by attaching motor to PLC and tested it. The results are collected for at two conditions;normal and trip operation conditions. With the addition of PLC in the existing system for control and automation of spinning machine's induction motor accuracy is higher than the normal traditional voltage-frequency (V/f) control mechanism and control system. This control system using PLC increases the efficiency of induction motor to 95%. In terms of speed regulation and efficiency, the PLC is very adaptable tool for industry and electric drives control. © 2019 IEEE.

关键词： controllers

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Evaluation of Road Safety Measures Efficiency in Conditions of Uncertainty

Evaluation of Road Safety Measures Efficiency in Conditions ...

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2019 International Science and Technology Conference on Earth Science, ISTCEarthScience 2019

作者： Korchagin, V. Chernishov, V. Klyavin, V. Rizayeva, J. Baryshev, N. Dvurechenskaya, A. Department of Road Traffic Control Lipetsk State Technical University 30 Moskovskaya St. Lipetsk398055 Russia Department of Mechatronics and International Engineering Orel State University 95 Komsomolskaya St. Orel302026 Russia Department of Foreign Languages Lipetsk State Technical University 30 Moskovskaya St. Lipetsk398055 Russia Main Dir. for Traffic Safety Administration for the Lipetsk Region 35 Internatsionalnaya Street City of Lipetsk398050 Russia

Scientific approaches and methods are considered of the social-economic evaluation of the efficiency of a set of measures on improving road safety in conditions of uncertainty. The risk levels for the adopted social-economic indicators were determined with the help of expert evaluation presented as a fuzzy number. In order to make a decision on a set of measures to be implemented, the scenario method, fuzzy linear programming, production rules were used. An integral indicator of the social-economic efficiency of measures is proposed as an objective means of assessment. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Economic efficiency

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Prototype Development of an Assistive Lower Limb Exoskeleton

Prototype Development of an Assistive Lower Limb Exoskeleton

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International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Nouman Siddique Asma Saif Furqan Imran Abdullah Kamran Umar Siddique Virk Imran Mahmood Ahmad Ali Nasir Ahmad Hafiz Farhan Maqbool Department of Mechatronics & Control Engineering UET Lahore Faisalabad Campus Faisalabad Pakistan

The number of patients suffering from physical or neurological disorder with lower limb impairment is increasing rapidly; hence, not allowing them to perform activities of daily livings (ADLs). This paper presents a preliminary work towards the development of a low-cost active lower limb exoskeleton that will assist the wearer while performing ADLs. The exoskeleton is modeled in Solid Works, with a single actuator at the knee joint that is controlled by getting the information from foot sensitive resistors (FSRs) and encoders. The desired knee angle in the sagittal plane during the swing phase of the gait was fed to the controller and then modeling, and simulation technique was applied to achieve the desired output. The preliminary results were reasonable as the system has the ability to assist during slow walking. Future work includes the necessary improvements in the proposed system so that investigations will be carried out for walking assistance of disabled persons.

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Resilient Estimation and control on k-Nearest Neighbor Platoons: A Network-Theoretic Approach

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IFAC-PapersOnLine 2018年第23期51卷 22-27页

作者： Pirani, Mohammad Hashemi, Ehsan Fidan, Baris Simpson-Porco, John W. Sandberg, Henrik Johansson, Karl Henrik Department of Automatic Control KTH Royal Institute of Technology China Department of Mechanical and Mechatronics Engineering University of Waterloo Canada Department of Electrical and Computer Engineering University of Waterloo Canada

This paper is concerned with the network-theoretic properties of so-called k-nearest neighbor intelligent vehicular platoons, where each vehicle communicates with k vehicles, both in front and behind. The network-theoretic properties analyzed in this paper play major roles in quantifying the resilience and robustness of three generic distributed estimation and control algorithms against communication failures and disturbances, namely resilient distributed estimation, resilient distributed consensus, and robust network formation. Based on the results for the connectivity measures of the k-nearest neighbor platoon, we show that extending the traditional platooning topologies (which were only based on interacting with nearest neighbors) to k-nearest neighbor platoons increases the resilience of distributed estimation and control algorithms to both communication failures and disturbances. © 2018

关键词： Robustness (control systems)

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Active Disturbance Rejection control of High-Order Flat Underactuated Systems: Mass-Spring Benchmark Problem 20th

Active Disturbance Rejection Control of High-Order Flat Unde...

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20th Polish control Conference, PCC 2020

作者： Madonski, Rafal Ramirez-Neria, Mario Giernacki, Wojciech Energy Electricity Research Center International Energy College Jinan University ZhuhaiGuangdong Province519070 China Mechatronics Department Universidad Politecnica del Valle de Mexico UPVM Tultitlan de Mariano Escobedo Fuentes del Valle54910 Mexico Institute of Robotics and Machine Intelligence Faculty of Control Robotics and Electrical Engineering Poznan University of Technology Poznan60-965 Poland

ISBN: (纸本)9783030509354

A custom active disturbance rejection control (ADRC) is proposed for trajectory tracking in uncertain underactuated systems. By utilizing a particular property of the differentially flat plant model, a robust output-feedback controller with a novel cascade of extended state observers (ESO) is introduced. It effectively deals with the problem of governing high-order plants without over-amplification of the measurement noise, typically seen in conventional single high-gain observer-centered control approaches. The proposed solution is based on full utilization of the information already available about the governed system, without necessity for additional measurement devices. In order to be easily implementable, it assumes only limited knowledge of the system model and is expressed in an industry familiar error-based form with a straightforward tuning method. A representable two-mass three-spring benchmark problem is used throughout the paper to convey the proposed idea and evaluate it experimentally on a laboratory testbed. © 2020, Springer Nature Switzerland AG.

关键词： Disturbance rejection

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Design of a high water-based fluid, high-pressure, and large-flow safety valve

Design of a high water-based fluid, high-pressure, and large...

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19th International Conference of Fluid Power and Mechatronic control engineering 2018

作者： Li, Geqiang Li, Liaoyuan Guo, Bingjing Li, Yuesong School of Mechatronics Engineering Henan University of Science and Technology Luoyang China Department of Measurement and Control Collaborative Innovation Center of Machinery Equipment Advanced Manufacturing of Henan Province China

Aiming at solving the problem of low unloading sensitivity, bad dynamic performance and poor stability of high-pressure and large-flow relief valve in hydraulic support system, a new differential type of high-pressure and large-flow relief valve, functioned by high water-based hydraulic medium, is designed. Through analysing the influence of spool form, elastic element, and working principle on valve performance, a structural scheme of large-flow and high-pressure safety valve is put forward. The three-dimensional fluid-solid coupling model of differential safety valve is established;through ADINA software, three-dimensional fluid-solid coupling simulation of relief valve's orifice from shutdown to full opening is carried out to analyse the distribution of internal pressure in the flow field of the safety valve and the pressure change of the structure field. The physical simulation model of safety valve is established by using AMESim software, and the dynamic performance of safety valve is simulated under the given signal of nominal flow and small flow. According to the design structure, the safety valve with the rated flow of 3000 L/min is manufactured and tested. The simulation and experimental results show that the safety valve has good dynamic performance and high sensitivity.. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Computer software

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