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arXiv 2023年

作者： Roelofs, Freek Johnson, Michael D. Chael, Andrew Janssen, Michael Wielgus, Maciek Broderick, Avery E. Akiyama, Kazunori Alberdi, Antxon Alef, Walter Algaba, Juan Carlos Anantua, Richard Asada, Keiichi Azulay, Rebecca Bach, Uwe Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Bauböck, Michi Benson, Bradford A. Bintley, Dan Blackburn, Lindy Blundell, Raymond Bouman, Katherine L. Bower, Geoffrey C. Boyce, Hope Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broguiere, Dominique Bronzwaer, Thomas Bustamante, Sandra Byun, Do-Young Carlstrom, John E. Ceccobello, Chiara Chan, Chi-Kwan Chang, Dominic O. Chatterjee, Koushik Chatterjee, Shami Chen, Ming-Tang Chen, Yongjun Cheng, Xiaopeng Cho, Ilje Christian, Pierre Conroy, Nicholas S. Conway, John E. Cordes, James M. Crawford, Thomas M. Crew, Geoffrey B. Cruz-Osorio, Alejandro Cui, Yuzhu Dahale, Rohan Davelaar, Jordy De Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Dexter, Jason Dhruv, Vedant Doeleman, Sheperd S. Dougal, Sean Dzib, Sergio A. Eatough, Ralph P. Emami, Razieh Falcke, Heino Farah, Joseph Fish, Vincent L. Fomalont, Ed Ford, H. Alyson Foschi, Marianna Fraga-Encinas, Raquel Freeman, William T. Friberg, Per Fromm, Christian M. Fuentes, Antonio Galison, Peter Gammie, Charles F. García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gómez-Ruiz, Arturo I. Gómez, José L. Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Haggard, Daryl Haworth, Kari Hecht, Michael H. Hesper, Ronald Heumann, Dirk Ho, Luis C. Ho, Paul Honma, Mareki Huang, Chih-Wei L. Huang, Lei Hughes, David H. Ikeda, Shiro Impellizzeri, C.M. Violette Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Jeter, Britton Jiang, Wu Jiménez-Rosales, Alejandra Jorstad, Svetlana Joshi, Abhishek V. Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kino, Motoki Koay, Jun Yi Kocherlakota, Prashant Kofuji, Yutaro Koch, Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Black Hole Initiative Harvard University 20 Garden Street CambridgeMA02138 United States Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Black Hole Initiative Harvard University 20 Garden Street CambridgeMA02138 United States Princeton Gravity Initiative Princeton University Jadwin Hall PrincetonNJ08544 United States Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Perimeter Institute for Theoretical Physics 31 Caroline Street North WaterlooONN2L 2Y5 Canada Department of Physics and Astronomy University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Waterloo Centre for Astrophysics University of Waterloo WaterlooONN2L 3G1 Canada Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Department of Physics Faculty of Science Universiti Malaya Kuala Lumpur50603 Malaysia Department of Physics & Astronomy The University of Texas at San Antonio One UTSA Circle San AntonioTX78249 United States Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Sec. 4 Roosevelt Rd. Taipei10617 Taiwan Departament d’Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 València BurjassotE-46100 Spain Observatori Astronòmic Universitat de València C. Catedrático José Beltrán 2 València PaternaE-46980 Spain Department of Space Earth and Environment Chalmers University of Technology Onsala Space Observatory OnsalaSE-43992 Sweden Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Yale Center for Astronomy & Astrophysics Yale Universit

The Event Horizon Telescope (EHT) is a millimeter very-long-baseline interferometry (VLBI) array which has imaged the apparent shadows of the supermassive black holes M87∗ and Sagittarius A∗. Polarimetric data from these observations contain a wealth of information on the black hole and accretion flow properties. In this work, we develop polarimetric geometric modeling methods for mm-VLBI data, focusing on approaches that fit data products with differing degrees of invariance to broad classes of calibration errors. We establish a fitting procedure using a polarimetric "m-ring" model to approximate the image structure near a black hole. By fitting this model to synthetic EHT data from general relativistic magnetohydrodynamic (GRMHD) models, we show that the linear and circular polarization structure can be successfully approximated with relatively few model parameters. We then fit this model to EHT observations of M87∗ taken in 2017. In total intensity and linear polarization, the m-ring fits are consistent with previous results from imaging methods. In circular polarization, the m-ring fits indicate the presence of event-horizon-scale circular polarization structure, with a persistent dipolar asymmetry and orientation across several days. The same structure was recovered independently of observing band, used data products, and model assumptions. Despite this broad agreement, imaging methods do not produce similarly consistent results. Our circular polarization results, which imposed additional assumptions on the source structure, should thus be interpreted with some caution. Polarimetric geometric modeling provides a useful and powerful method to constrain the properties of horizon-scale polarized emission, particularly for sparse arrays like the EHT. © 2023, CC BY.

关键词： Polarimeters

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Fault Detection of a 6-DOF Hydraulic Platform Based on Equivalent-Input-Disturbance Approach 29

Fault Detection of a 6-DOF Hydraulic Platform Based on Equiv...

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第29届中国控制与决策会议

作者： Qianqiu Li Jinhua She Min Wu Pingping Lin School of Information Science and Engineering Central South University School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems School of Engineering Tokyo University of Technology

ISBN: (纸本)9781509046584

This paper presents a method of fault detection for a 6-degree-of-freedom hydraulic platform based on the equivalent-input-disturbance(EID) ***,a model of the platform is derived based on the Lagrange ***,the types of actuator faults are ***,an optimal feedback controller is designed and the EID approach is incorporated to detect and suppress actuator *** results demonstrate the effectiveness of the method.

关键词： Equivalent input disturbance 6 degrees of freedom Fault detection Optimal feedback controller

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Decoupling control for Parallel Robot Based on Equivalent-Input-Disturbance Approach 29

Decoupling Control for Parallel Robot Based on Equivalent-In...

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第29届中国控制与决策会议

作者： Pingping Lin Jinhua She Min Wu Qianqiu Li School of Information Science and Engineering Central South University School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems School of Engineering Tokyo University of Technology

ISBN: (纸本)9781509046584

This paper discusses the problem of posture control for a parallel *** parallel robot features multiple variables and large *** control accuracy is strongly affected by the parameters which are coupled with each other,and by exogenous disturbances.A decoupling control strategy is presented based on the equivalent-inputdisturbance(EID) approach to improve control ***,decoupling control is used to eliminate the main coupling effect between multiple ***,the EID method is used to further improve decoupling effect and suppress the external *** results show that the control strategy is effective for the decoupling control of parallel robot.

关键词： Parallel Robot Decoupling control Equivalent Input Disturbance(EID) PID

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Remaining Useful Battery Life Prediction for UAVs based on Machine Learning

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IFAC-PapersOnLine 2017年第1期50卷 4727-4732页

作者： Mansouri S.S. Karvelis P. Georgoulas G. Nikolakopoulos G. Robotics Group Control Engineering Division of the Department of Computer Electrical and Space Engineering Luleå University of Technology Luleå SE-97187 Sweden Laboratory of Knowledge and Intelligent Computing Department of Computer Engineering Technological Educational Institute of Epirus Arta Greece

Unmanned Aerial Vehicles are becoming part of many industrial applications. The advancements in battery technologies played a crucial part for this trend. However, no matter what the advancements are, all batteries have a fixed capacity and after some time drain out. In order to extend the flying time window, the prediction of the time that the battery will no longer be able to support a flying condition is crucial. This in fact can be cast as a standard Remaining Useful Life prognostic problem, similarly encountered in many fields. In this article, the problem of Remaining Useful Life estimation of a battery, under different flight conditions, is tackled using four machine learning techniques: a linear sparse model, a variant of support vector regression, a multilayer perceptron and an advanced tree based algorithm. The efficiency of the overall proposed machine learning techniques, in the field of batteries prognostics, is evaluated based on multiple experimental data from different flight conditions. © 2017

关键词： Battery Machine Learning Prediction Remaining Useful Life UAVs

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A unified angle control scheme for hypersonic vehicle based on disturbance rejection 21

A unified angle control scheme for hypersonic vehicle based ...

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21st AIAA International space Planes and Hypersonics Technologies Conference, Hypersonics 2017

作者： Piao, Minnan Zhu, Kai Sun, Mingwei Chen, Zengqiang Dept. of Automation and Intelligent Science College of Computer and Control Engineering Nankai University Tianjin300350 China Tianjin Key Laboratory of Intelligent Robotics Tianjin300350 China Beijing Aerospace Technology Institute Beijing100074 China

ISBN: (数字)9781624104633

ISBN: (纸本)9781624104633

Hypersonic vehicles are characterized with strong nonlinearities, coupling effects and uncertainties as well as fast time-varying parameters, which impose great difficulty to the attitude control. This study proposes a unified scheme for all the Euler angles, angle of attack, and sideslip angle. First, three controllers based on active disturbance rejection control (ADRC) are designed for the Euler angles respectively, in which the external disturbances and the internal uncertainties can be estimated by the extended state observer (ESO) and compensated in real time actively. Then the geometric relations among the angles with different time scales are utilized to transform the commands of α and β into the commands of the pitch angle and the yaw angle. Next the stability-margin tester method is employed to tune the controller parameters, which guarantees the stability and robustness of the control system. 1000 nonlinear six-degree-of-freedom Monte Carlo simulation results demonstrate the good tracking performance and the robustness of the proposed control method. © 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Hypersonic vehicles

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Design and Implement the Continuous Flickering SSVEP-BCI in Augmented Reality

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Journal of Physics: Conference Series 2020年第1期1631卷

作者： Ruiyan Wang Yufeng Ke Shuang Liu Jiale Du Cheng Xu Bohao Xing Dong Ming Tianjin International Engineering Institute Tianjin University Tianjin University 300072 China Academy of Medical Engineering and Translational Medicine Tianjin University Tianjin 300072 China School of Precision Instruments & Opto-Electronics Engineering Tianjin University Tianjin 300072 China Science and Technology on Complex System Control and Intelligent Agent Cooperative Laboratory No. 40 Yun'gangbeili Fengtai District Beijing 100074 China

Brain-computer interface (BCI) provides a new way to express our minds without peripheral nerves and muscles. In this work, a process control recognition method based on continuous flickering is proposed to output continuous commands. Phase matching method was applied in this work, matching the test data with the template with the same phase to improve the accuracy. We also put forward a high tolerance criterion and give a new definition to the recognition result of attention shift period. We first conducted a screen-based continuous flickering feasibility verification experiment using correlation component analysis algorithm (TRCA) method, and the recognition accuracy reached 85% and 90% under high tolerance criterion. The average offline simulation information translates rate (ITR) was 455.8 bit/min, and the highest ITR reached 524.7bit/min, which certificated the feasibility. Furthermore, we carried out a drone control experiment based on augmented reality (AR)-BCI using extended filter bank canonical correlation analysis (extended-FBCCA), and achieved an average accuracy of 90% and ITR of 49.1 bit/min, having better performance than repetitive visual stimulus (RVS) with intervals.

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intelligent control and information management system for plant growth cabinet based on Internet of Things 17

Intelligent control and information management system for pl...

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2017 International Conference on Management Engineering, Software Engineering and Service sciences, ICMSS 2017

作者： Chen, Qi Wang, Xinlei Liang, Fan Economics and Business Management School Tianjin Sino-German University of Applied Science China Tianjin Key Laboratory of Information Sensing and Intelligent Control Tianjin University of Technology and Education China

ISBN: (纸本)9781450348348

Plant growth cabinet (PGC) is a closed plant growth environment that can provide temperature, humidity and other factors required in the process of plant growth and development. In this study, we propose an intelligent control and information management system based on Internet of Things (IoT). Every IOT system has three layers that are the sensing layer, the transmission layer, and the application layer. We implement the sensing layer through the Android subsystem software design with environmental parameters. The Android application software was built to realize the many functions such as the plants' morphological data collection, display of the environmental information in the PGC, and monitor ship of the plant growth process in real time, make the reasonable regulation of the control node meanwhile. The IoT transmission layer communicates in WiFi wireless way. In the application layer, the vegetable maturity could be forecast by fusing the images information through two artificial neural networks on the IoT server. Moreover, the several other feature functions, including remotely monitoring the PGC and the posting the environmental data, pictures and videos of the plant in the SQL database, are available for the user to manage the PGC. The experimental results indicate that the control strategy in IoT sensing layer and maturity prediction model in IoT application layer are of high-efficiency. The IoT system design is effective to provide an appropriate growth environment guidance and management for the plant growth. © 2017 ACM.

关键词： Internet of things

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Construction of Barrier in a Fishing Game with Point Capture

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IEEE Transactions on Cybernetics 2017年第6期47卷 1409-1422页

作者： Zha, Wenzhong Chen, Jie Peng, Zhihong Gu, Dongbing School of Automation Beijing Institute of Technology Beijing100081 China Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing100081 China School of Computer Science and Electronic Engineering University of Essex ColchesterCO4 3SQ United Kingdom

This paper addresses a particular pursuit-evasion game, called as 'fishing game' where a faster evader attempts to pass the gap between two pursuers. We are concerned with the conditions under which the evader or pursuers can win the game. This is a game of kind in which an essential aspect, barrier, separates the state space into disjoint parts associated with each player's winning region. We present a method of explicit policy to construct the barrier. This method divides the fishing game into two subgames related to the included angle and the relative distances between the evader and the pursuers, respectively, and then analyzes the possibility of capture or escape for each subgame to ascertain the analytical forms of the barrier. Furthermore, we fuse the games of kind and degree by solving the optimal control strategies in the minimum time for each player when the initial state lies in their winning regions. Along with the optimal strategies, the trajectories of the players are delineated and the upper bounds of their winning times are also derived. © 2013 IEEE.

关键词： Optimal systems

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Graphene: Room‐Temperature Colossal Magnetoresistance in Terraced Single‐Layer Graphene (Adv. Mater. 37/2020)

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Advanced Materials 2020年第37期32卷

作者： Junxiong Hu Jian Gou Ming Yang Ganesh Ji Omar Junyou Tan Shengwei Zeng Yanpeng Liu Kun Han Zhishiuh Lim Zhen Huang Andrew Thye Shen Wee Ariando Ariando NUSNNI National University of Singapore Singapore 117411 Singapore Department of Physics National University of Singapore Singapore 117542 Singapore Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore Singapore 117551 Singapore Institute of Materials Research & Engineering A*STAR (Agency for Science Technology and Research) Singapore 138634 Singapore State Key Laboratory of Mechanics and Control of Mechanical Structures MOE Key Laboratory for Intelligent Nano Materials and Devices and Institute of Nano Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

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Autonomous Navigation for Constellation Based on inter-satellite ranging and directions

Autonomous Navigation for Constellation Based on inter-satel...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Ruipeng Li Hongzhuan Qiu Kai Xiong School of Automation Science and Eletrical Engineering Beihang University Beijing China Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control Engineering Beijing China

This paper mainly studies the autonomous navigation method for the constellation. Based on the measurements of inter-satellite ranging and direction, a federated filter algorithm is presented. Then, to redue the error caused by the constellation rotation, a camera is applied in observations. Ultimately, the feasibility of reducing the number of cameras observations is discussed. The simulation results demonstrate the effectiveness of the federated filter for autonomous navigation. Meanwhile, it has been verified that the error induced by the constellation rotation can be effectively reduced by only one camera.

关键词： Satellites Extraterrestrial measurements Orbits Mathematical model Distance measurement Cameras Satellite navigation systems

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