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arXiv 2024年

作者： Jafarzadeh, S. Schiavo, L.A.C.A. Fedun, V. Solanki, S.K. Stangalini, M. Calchetti, D. Verth, G. Jess, D.B. Grant, S.D.T. Ballai, I. Gafeira, R. Keys, P.H. Fleck, B. Morton, R.J. Browning, P.K. Silva, S.S.A. Appourchaux, T. Gandorfer, A. Gizon, L. Hirzberger, J. Kahil, F. Suárez, D. Orozco Schou, J. Strecker, H. del Toro Iniesta, J.C. Valori, G. Volkmer, R. Woch, J. Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 Göttingen37077 Germany School of Physics & Astronomy The University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Department of Mathematics Physics and Electrical Engineering Northumbria University Newcastle upon TyneNE1 8ST United Kingdom Plasma Dynamics Group Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom ASI Italian Space Agency Via del Politecnico snc RomeI-00133 Italy Plasma Dynamics Group School of Mathematics and Statistics The University of Sheffield Hicks Building Hounsfield Road SheffieldS3 7RH United Kingdom Astrophysics Research Centre School of Mathematics and Physics Queen’s University Belfast BelfastBT7 1NN United Kingdom Department of Physics and Astronomy California State University Northridge NorthridgeCA91330 United States Instituto de Astrofísica e Ciências do Espaço Department of Physics University of Coimbra Coimbra3040-004 Portugal ESA Science and Operations Department c/o NASA Goddard Space Flight Center GreenbeltMD20771 United States Univ. Paris-Sud Institut d’Astrophysique Spatiale UMR 8617 CNRS Bâtiment 121 Orsay91405 Cedex France Apartado de Correos 3004 GranadaE-18080 Spain Leibniz-Institut für Sonnenphysik Schöneckstr. 6 FreiburgD-79104 Germany Institut für Astrophysik und Geophysik Georg-August-Universität Göttingen Friedrich-Hund-Platz 1 Göttingen37077 Germany

Solar pores are intense concentrations of magnetic flux that emerge through the Sun’s photosphere. When compared to sunspots, they are much smaller in diameter and hence can be impacted and buffeted by neighbouring granular activity to generate significant magnetohydrodynamic (MHD) wave energy flux within their confines. However, observations of solar pores from ground-based telescope facilities may struggle to capture subtle motions synonymous with higher-order MHD wave signatures due to seeing effects produced in the Earth’s atmosphere. Hence, we have exploited timely seeing-free and high-quality observations of four small magnetic pores from the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (PHI) on board the Solar Orbiter spacecraft, during its first close perihelion passage in March 2022 (at a distance of 0.5 au from the Sun). Through acquisition of data under stable observing conditions, we have been able to measure the area fluctuations and horizontal displacements of the solar pores. Cross correlations between perturbations in intensity, area, line-of-sight velocity, and magnetic fields, coupled with the first-time application of novel Proper Orthogonal Decomposition (POD) techniques on the boundary oscillations, provide a comprehensive diagnosis of the embedded MHD waves as sausage and kink modes. Additionally, the previously elusive m = 2 fluting mode is identified in the most magnetically isolated of the four pores. An important consideration lies in how the identified wave modes contribute towards the transfer of energy into the upper solar atmosphere. We find that the four pores examined have approximately 56%, 72%, 52%, and 34% of their total wave energy associated with the identified sausage modes, and around 23%, 17%, 39%, and 49% to their kink modes, respectively, while the first pore also has around an 11% contribution linked to the fluting mode. This study marks the first-time identification of concurrent sausage, kin

关键词： Magnetohydrodynamics

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Formation control with disturbance rejection for a class of Lipschitz nonlinear systems

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Science China(Information Sciences) 2017年第7期60卷 29-39页

作者： Chunyan WANG Zongyu ZUO Qinghai GONG Zhengtao DING School of Electrical and Electronic Engineering University of Manchester Sackville Street Building Sino-British Joint Advanced Control System Technology Laboratory James Lighthill Building The Seventh Research Division and Science and Technology on Aircraft Control Laboratory Beihang University Beijing Aerospace Automatic Control Institute

In this paper, we consider the leader-follower formation control problem for general multi-agent systems with Lipschitz nonlinearity and unknown disturbances. To deal with the disturbances, a disturbance observer-based control strategy is developed for each follower. Then, a time-varying formation protocol is proposed based on the relative state of the neighbouring agents and sufficient conditions for global stability of the formation control are identified using Lyapunov method in the time domain. The proposed strategy and analysis guarantee that all signals in the closed-loop dynamics are uniformly ultimately bounded and the formation tracking errors converge to an arbitrarily small residual set. Finally, the validity of the proposed controller is demonstrated through a numerical example.

关键词： multi-agent systems formation control Lipschitz nonlinearity disturbance rejection

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Multi-ary α-ordered linear minimal resolution method in lattice-valued logic system

Multi-ary α-ordered linear minimal resolution method in lat...

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作者： Hairui, Jia Yi, Liu Yang, Xu Intelligent Control Development Center Southwest Jiaotong University Chengdu Sichuan610031 China National-Local Joint Engineering Laboratory of System Credibility Automatic Verification Southwest Jiaotong University Chengdu China College of Mathematics and Information Science Neijiang Normal University Neijiang Sichuan China

On the basis of α-minimal resolution principle, an α-n(t)-ary resolution dynamic automated reasoning method - multi-ary α-ordered linear minimal resolution method is studied in lattice-valued propositional logic system LP(X) and lattice-valued first-order logic system LF(X) based on lattice implication algebra (LIA). Firstly, multi-ary α-ordered linear minimal resolution method is established in LP(X), while its theorems of both soundness and completeness are proved. Then, multi-ary α-ordered linear minimal resolution method is further established in the corresponding lattice-valued first-order logic LF(X), along with its soundness theorem, lifting lemma, and completeness theorem. Then, the validity of multi-ary α-ordered linear minimal resolution based on lattice-valued logic is analyzed. At last, an multi-ary α-ordered linear minimal resolution algorithm in LP(X) is designed, and it is proved to be sound and complete, then it is further extended in the corresponding LF(X). This lays the foundation for the further study on α-n(t)-ary resolution dynamic automated reasoning program. © 2018 - IOS Press and the authors. All rights reserved.

关键词： Computer circuits

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Supporting Product Oriented Manufacturing: a Model Driven and Agent based Approach

Supporting Product Oriented Manufacturing: a Model Driven an...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Mikel López Jon Martín Unai Gangoiti Aintzane Armentia Elisabet Estévez Marga Marcos Dept. of Automatic Control and System Engineering ETSI Bilbao (UPV/EHU) Bilbao Spain Dept. Electronic and Automatic Engineering EPS de Jaén University of Jaén Jaén Spain

Product oriented manufacturing is aligned with one of the Industry 4.0 trends consisting of integrating all production systems. This implies shifting from a traditional view of manufacturing processes focused on production line in order to reduce costs, to a more flexible and customized product manufacturing. On the other hand, Multi Agent systems (MAS) have been proved to be a suitable way to fulfill these requirements. However, a key aspect of the use of novel technologies is to offer methodologies and tools for supporting the implementation of such systems. In this sense, this paper uses Model Driven engineering and MAS technology to propose an architecture that is able to launch and execute a manufacturing execution plan. It focuses on the information models managed by architecture agents that can be customized to particular manufacturing plants as well as on the definition of agent templates.

关键词： Manufacturing processes Tools Ontologies systems engineering and theory Industries

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Distributed formation control for a leader-follower structure on directed graphs with a model unknown leader

Distributed formation control for a leader-follower structur...

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第37届中国控制会议

作者： Yuanjin Yu Chunyan Wang Zhenqiang Qi Zhengtao Ding Xin Yin School of Electrical and Electronic Engineering University of Manchester Sino-British Joint Advanced Control System Technology Laboratory School of Aerospace Engineering Beijing Institute of Technology Beijing Aerospace Automatic Control Institute

To deal with leader-follower formation of multi-agent systems with a leader whose dynamics are unknown, a consensus based method is presented to achieve formation keeping for a directed graph. We divide the followers into two parts according to path distance. For the followers connected to the leader, a state-feedback regulation is applied. Then the directed graph is reconstructed and a consensus based method is designed. The controller is implemented in a fully distributed form because each follower only uses the relative and local information. Finally, numerical simulations applying this method to time-varying formation and trajectory tracking are performed. The results validate the effectiveness of the proposed method.

关键词： Formation control Consensus Multi-agent systems

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Gradient-Based Collision Avoidance Algorithm for Second-Order Multi-Agent Formation control 36

Gradient-Based Collision Avoidance Algorithm for Second-Orde...

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第36届中国控制会议

作者： Qinghai Gong Chunyan Wang Zhenqiang Qi Zhengtao Ding Beijing Aerospace Automatic Control Institute Sino-British Joint Advanced Control System Technology Laboratory School of Electrical and Electronic Engineering University of Manchester

ISBN: (纸本)9781538629185

This paper investigates the collision avoidance problem in formation ***,a collision avoidance algorithm is proposed by using the gradient-based ***,a collision-free consensus based formation protocol is developed for a group of second-order systems with the aid of graph *** particular,the formation protocol is designed only based on the relative information obtained via the network connection,without the global information of the ***,simulation results with different topologies verify the effectiveness of the proposed algorithms.

关键词： Multi-Agent systems formation control gradient-based collision avoidance consensus algorithm

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Distributed Coverage Optimization and control with Applications to Precision Agriculture

Distributed Coverage Optimization and Control with Applicati...

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第37届中国控制会议

作者： Jun Zhang Hilton Tnunay Chunyan Wang Xinguang Lyu Zhengtao Ding Sino-British Joint Advanced Control System Technology Laboratory University of Manchester Beijing Aerospace Automatic Control Institute School of Electrical and Electronic Engineering University of Manchester School of Aerospace Engineering Beijing Institute of Technology

In this paper, distributed coverage optimization and control problem with collision avoidance and parameter estimation are studied. First, we consider the case that the density function φ(q) is known by all the robots in the network. By using the interaction term of Voronoi neighbour, coverage optimization and control protocols are designed in a distributed way such that the best position of each robot can be determined and all the robots can move to the best positions without collision. Then, we consider the case that the density function φ(q) is not known by the robots. By using the adaptive technique, the density functionφ(q) can be estimated in a fast and distributed way. Finally, the proposed coverage control scheme are applied to remote sensing for precision farming and the effectiveness of the strategy is validated through some simulation results.

关键词： Precision Agriculture Coverage control Distributed Strategy Density Function Estimation

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Output feedback control based on state and disturbance estimation

arXiv

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arXiv 2018年

作者： Hu, Wuhua Camacho, Eduardo F. Xie, Lihua Singapore Singapore Department of System Engineering and Automatic Control Escuela Superior de Ingenieros University of Sevilla Spain School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore

Recently developed control methods with strong disturbance rejection capabilities provide a useful option for control design. The key lies in a general concept of disturbance and effective ways to estimate and compensate the disturbance. This work extends the concept of disturbance as the mismatch between a system model and the true dynamics, and estimates and compensates the disturbance for multi-input multi-output linear/nonlinear systems described in a general form. The results presented do not need to assume the disturbance to be independent of the control inputs or satisfy a certain matching condition, and do not require the system to be expressible in an integral canonical form as required by algorithms previously described in literature. The estimator and controller are designed under a state tracking framework, and sufficient conditions for the closed-loop stability are presented. The performance of the resulting controller relies on a co-design of the system model, the state and disturbance observer, and the controller. Numerical experiments on a first-order system and an inverted pendulum under uncertainties are used to illustrate the control design method and demonstrate its efficacy. Copyright © 2018, The Authors. All rights reserved.

关键词： Linear systems

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Protective control for robot manipulator by sliding mode based disturbance reconstruction approach

Protective control for robot manipulator by sliding mode bas...

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2017 IEEE International Conference on Advanced Intelligent Mechatronics, AIM 2017

作者： Yiyong, Sun Zengjie, Zhang Leibold, Marion Hayat, Rameez Wollherr, Dirk Buss, Martin Research Institute of Intelligent Control and System Harbin Institute of Technology Harbin150001 China Automatic Control Engineering Technical University of Munich Munich80333 Germany

ISBN: (纸本)9781509059980

This paper presents a protective control framework for robot manipulators using sliding mode based state estimation and disturbance reconstruction. Specifically, the nonlinear dynamic state-space model of the robot is transformed into a descriptor form, allowing the design of a sliding mode observer and a sliding mode based trajectory tracking control. Different reaction strategies to protect the robot manipulator are presented according to the strength of the disturbance and whether the environment is completely perceptible. Finally, to show the effectiveness of this novel combination of sliding mode observer and protective controller, an experiment on a two degree-of-freedom manipulator is conducted. © 2017 IEEE.

关键词： Degrees of freedom (mechanics)

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A Tool Suite for automatic Generation of Modular Machine Automation Projects

A Tool Suite for Automatic Generation of Modular Machine Aut...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Aintzane Armentia Elisabet Estévez Darío Orive Marga Marcos Dept. of Automatic Control and System Engineering ETSI Bilbao (UPV/EHU) Bilbao Spain EPS de Jaén University of Jaén Jaén Spain

Global competition has resulted in changes on product demand which have to be managed by current manufacturing systems. In this context, modularity seems to be a suitable solution to provide manufacturing systems with the flexibility required to adapt to demand fluctuations when they occur, maintaining thus competitiveness and productivity. In concrete, machine modularity allows modifying a machine structure but it should be accomplished easily and rapidly. The current work proposes a model-driven methodology that allows modular machine definition and the automatic generation of the corresponding automation project, including the machine hardware configuration and its control software. It is based on the use of eXtensible Markup Language (XML) format and technologies for both model definition and code generation. The methodology has been implemented as a tool suite whose proof of concept has been developed for the particular case of the Siemens Totally Integrated Automation Portal (TIA Portal) PLC programming tool.

关键词： Automation Tools XML Portals Hardware Software Programming

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