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International Journal of Adaptive control and Signal Processing 2003年第5期17卷

作者： Rolf Johansson Michel Verhaegen Prof. Dept. of Automatic Control Lund Institute of Technology Lund University P.O. Box 118 SE-221 00 Lund Sweden Prof. dr. ir. Chairman Control Systems Engineering Laboratory Faculty of Information Technology Systems Mekelweg 4 NL-2600 GA Delft The Netherlands

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14.4 — Is a General Purpose Adaptive control Software/Regulator Feasible?

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IFAC Proceedings Volumes 1987年第5期20卷 115-115页

作者： Ioan Landau Karl J. Åstrom David Clarke Graham C. Goodwin Mohammed M’Saad Laboratoire d’Automatique de Grenoble I.N.P.G. / C.N.R.S. GRECO “Systèmes Adaptatifs” FRANCE Dept. of Automatic Control Lund Institute of Technology SWEDEN Dept. of Engineering Science Oxford University UNITED KINGDOM Dept. of Electrical Engineering University of Newcastle AUSTRALIA Laboratoire d’Automatique de Grenoble (I.N.P.G./C.N.R.S.) GRECO “Systèmes Adaptatifs” FRANCE

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Magnetic shocks and substructures excited by torsional Alfvén wave interactions in merging expanding flux tubes

arXiv

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arXiv 2018年

作者： Snow, B. Fedun, V. Gent, F.A. Verth, G. Erdélyi, R. School of Mathematics and Statistics University of Sheéld S3 7RH United Kingdom Department of Automated Control and Systems Engineering University of Sheéld S1 3JD United Kingdom Department of Computer Science ReSoLVE Centre of Excellence Aalto University PO Box 15400 HelsinkiFI-00076 Finland Dept. of Astronomy Eötvös L. University Pazmany Peter sétány 1/A BudapestH-1117 Hungary

Vortex motions are frequently observed on the solar photosphere. These motions may play a key role in the transport of energy and momentum from the lower atmosphere into the upper solar atmosphere, contributing to coronal heating. The lower solar atmosphere also consists of complex networks of ux tubes that expand and merge throughout the chromosphere and upper atmosphere. We perform numerical simulations to investigate the behaviour of vortex driven waves propagating in a pair of such ux tubes in a non-force-free equilibrium with a realistically modelled solar atmosphere. The two ux tubes are independently perturbed at their footpoints by counter-rotating vortex motions. When the ux tubes merge, the vortex motions interact both linearly and nonlinearly. The linear interactions generate many small-scale transient magnetic substructures due to the magnetic stress imposed by the vortex motions. Thus, an initially monolithic tube is separated into a complex multi-threaded tube due to the photospheric vortex motions. The wave interactions also drive a superposition that increases in amplitude until it exceeds the local Mach number and produces shocks that propagate upwards with speeds of approximately 50 km s1. The shocks act as conduits transporting momentum and energy upwards, and heating the local plasma by more than an order of magnitude, with peak temperature approximately 60;000 K. Therefore, we present a new mechanism for the generation of magnetic waveguides from the lower solar atmosphere to the solar corona. This wave guide appears as the result of interacting perturbations in neighbouring ux tubes. Thus, the interactions of photospheric vortex motions is a potentially significant mechanism for energy transfer from the lower to upper solar atmosphere. Copyright © 2018, The Authors. All rights reserved.

关键词： Magnetohydrodynamics

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Detection of the External Magnetic Field Polarity Through the Inductance Voltage Harmonic Phase Order

Detection of the External Magnetic Field Polarity Through th...

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Telecommunications Forum

作者： Nebojsa U. Pjevalica Nenad S. Petrovic Milos M. Nikolic the University of Novi Sad Faculty of Technical sciences Computing and control engineering dept. Trg Dositeja Obradovica 6 21000 Novi Sad Serbia the School of Electrical Engineering Stari grad Visokog Stevana 37 11000 Belgrade Serbia RT-RK Computer based systems Narodnog fronta 23a 21000 Novi Sad Serbia

ISBN: (纸本)9781509000562

Inductance is a basic electrical element that couples magnetic flux and current. In many applications the linear approximation of inductance provides sufficiently good results of analysis. In the presence of an additional DC bias magnetic field H_(DC), the observed B-H curve is forced to be moved from its unbiased state and an asymmetric nonlinearity of the targeted inductance is produced. Diagnostic method is proposed, which couples voltage harmonic phases and the direction of H_(DC) bias field by means of the LT Spice simulation. An experimental verification of the proposed technique is successfully accomplished, along with the settlement of the further research.

关键词： harmonic component DC bias hysteresis curve inductance nonlinear inductance

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A radio and plasma wave experiment for the Solar Orbiter mission

A radio and plasma wave experiment for the Solar Orbiter mis...

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2nd Solar Orbiter Workshop

作者： Maksimovic, M. Bale, S.D. Vaivads, A. Krasnoselskikh, V. Chust, T. Balikhin, M. Goetz, K. Gough, P. Travnicek, P. Soucek, J. Rucker, H. LESIA Observatoire de Paris Place Jules Janssen 92195 Meudon cedex France Department of Physics Space Sciences Laboratory University of California Berkeley Berkeley CA 94720-7450 United States Swedish Institute of Space Physics Uppsala Sweden LPCE/CNRS 3A ave. de la recherche scientifique 47071 Orleans cedex France CETP 10-12 avenue de l'Europe 78140Vélizy France Dept. of Automatic Control and Systems Eng. University of Sheffield Mappin Street Sheffield S13JD United Kingdom School of Physics and Astronomy University of Minnesota 116 Church street S.E. Minneapolis MN 55455-0112 United States Space Science Centre School of Engineering University of Sussex Brighton BN1 9QT United Kingdom Institute of Atmospheric Physics Czech Academy of Sciences Bocni II 1401 14131 Prague 4 Czech Republic Space Research Institute Austrian Academy of Sciences Graz Austria

ISBN: (纸本)9290922052

We present in this paper the general characteristics of a Radio and Plasma Wave experiment that we wish to submit in response to a possible Announcement of Opportunity for the Solar Orbiter payload. This experiment will provide measurements of both electrostatic and electromagnetic fields and waves in a broad frequency band, typically from a fraction of a Hertz up to a few tens of MHz, covering therefore all the scientific objectives described in the Solar Orbiter Science requirements document.

关键词： Space research

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control Incentives for Leader-Follower Model in Communication Networks and Softcomputing Potential

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IFAC Proceedings Volumes 2001年第3期34卷 15-26页

作者： G.M. Dimirovski Yuanwei Jing Siying Zhang K. Sohraby Inst. of Automation & Systems Engg. SS Cyril & Methodius University Skopje. R. of Macedonia. and DOGUS University. 81010 Istanbul-Kadikoy R. of Turekey Fax# +90-2 1 6-32 7-9631 Institute of Control Science. School of Information Science & Engineering Northeastern University. Shenyang. Liaoning. 110006. P.R. of China Fax# +86-24-2389-3138 Dept. Of Computer Science & Telecommunications. University of Missouri - Kansas Kansas City. M064J JO. USA

The problem of networking supervision and traffic rate control in multi-service network systems is studied by using concepts of Nash equilibrium and Stackelberg strategy under assumption of two-level system architecture. Models of users, network provider and overall system in game-theoretic setting are presented. Linear Stackelberg incentive strategies are derived for both elastic and non-elastic traffic, and verified using Kelly's example. Outlines of the two-level integrated control and supervision architecture, and of the proposed fuzzy-Perti-net supervisor are given.

关键词： Communication networks fuzzy Petri-nets game theory incentives optimisation Stackelberg strategies

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Multi-Scale Distributed Port-Hamiltonian Representation of Ionic Polymer-Metal Composite

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IFAC Proceedings Volumes 2008年第2期41卷 2300-2305页

作者： Gou Nishida Kentaro Takagi Bernhard Maschke Zhi-wei Luo RIKEN(The Institute of Physical and Chemical Research) Bio-Mimetic Control Research Center Environment Adaptive Robotic Systems Lab. 2271-130 Anagahora Shimoshidami Moriyama-ku Nagoya Aichi 463-0003 Japan Dept. of Mechanical Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 JAPAN Université Claude Bernard Lyon-1 CPE Lyon - Bâtiment 308 G UCB Lyon 1 - UFR Génie Electrique et des Procédés - CNRS UMR 5007 Laboratoire d'Automatique et de Génie des Procédés 43 bd du 11 Novembre 1918 F-69622 Villeurbanne cedex France Department of Computer and Systems Engineering Kobe University 1-1 Rokkodai Nada-ku Kobe Hyogo 657-8501 JAPAN / RIKEN BMC

This paper shows that one of soft actuators, Ionic Polymer-Metal Composite (IPMC) can be modeled in terms of distributed port-Hamiltonian systems with multi-scale. The physical structure of IPMC consists of three parts. The first part is an electric double layer at the interface between the polymer and the metal electrodes. The frequency response of the polymer-metal interface shows a fractal degree of gain slope. Then we adopt a black-box circuit model to this part and give considerations for distributed impedance parameters. The second part is an electrostress diffusion coupling model with bending and relaxation dynamics. This part is represented by an electro-osmosis, which is a water transport by an electric field, and a streaming potential, which is an electric field created by a water transport. We discuss the relationship of stress and bending moment induced by swelling. The third part is a mechanical system modeled as a flexible beam with large deformations. The representation has the capability extracting the control structure based on passivity from distributed parameter systems possessing a complex behavior.

关键词： Modeling Design methodologies

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Development of an innovative method to predict and to characterize the performances of Ti-6Al-4V LBW joints

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AIP Conference Proceedings 2016年第1期1769卷

作者： Mariacira Liberini Sara Esposito Kambitz Reshad Barbara Previtali Marco Viola Antonino Squillace 1University of Naples “Federico II” Dept. of Chemical Materials and Industrial Production Engineering P.le Tecchio 80 80125 Naples Italy 2Polytechnic of Milan Mechanical Engineering Department via La Masa 1 20156 Milano Italy 3Sapienza University of Rome Dept. of Computer Control and Management Engineering Via Ariosto 25 00185 Rome Italy.

Every manufacturing process leaves on the surface of the piece a typical “technology signature”. In particular, the laser welding leaves a feature at the edge of the weld bead called “undercut”. In this work an experimental campaign has been conducted on Ti6Al4V butt joints. In particular a Central Composite Design (CCD) with the central point repeated three times has been investigated. In the CCD there are two factors (power and speed of the fiber laser) and five levels for each factor. This paper deals with the investigation about the correlation between the severity of the undercut and the process parameters of the laser welding. In particular, through the confocal microscopy, the original geometry of the joint was accurately acquired and rebuilt in order to make a FEM model and simulate the mechanical behavior using Ansys14.5. Moreover, response surfaces and level curves were carried out to understand and predict the dept. and the width of the undercut starting from the power and the speed of the laser. At last a mathematic and geometry regression was performed in order to find a unique conical curve that interpolates all the different undercuts and that varies its parameters according to the process parameters. It is established that the process with higher speed minimizes and optimizes the undercut in the joints.

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Optimal guaranteed cost control for fuzzy descriptor systems with time-varying delay

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Journal of Systems engineering and Electronics 2008年第3期000卷

作者： Tian Weihua Zhang Huaguang Tian Weihua (School of Information Science and Engineering Northeastern Univ. Shenyang 110004 P. R. China Dept. of Automatic Control Shenyang Inst. of Engineering Shenyang 110136 P. R. China) Zhang Huaguang (School of Information Science and Engineering Northeastern Univ. Shenyang 110004 P. R. China.)

Based on the delay-independent rule, the problem of optimal guaranteed cost control for a class of Takagi-Sugeno (T-S) fuzzy descriptor systems with time-varying delay is studied. A linear quadratic cost function is considered as the performance index of the closed-loop system. Sufficient conditions for the existence of guaranteed cost controllers via state feedback are given in terms of linear matrix inequalities (LMIs), and the design of an optimal guaranteed cost controller can be reduced to a convex optimization problem. It is shown that the designed controller not only guarantees the asymptotic stability of the closed-loop fuzzy descriptor delay system, but also provides an optimized upper bound of the guaranteed cost. At last, a numerical example is given to illustrate the effectiveness of the proposed method and the perfect performance of the optimal guaranteed cost controller.

关键词： fuzzy descriptor systems optimal guaranteed cost control time-varying delay linear matrix inequalities (LMIs)

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Simple security proof of twin-field type quantum key distribution protocol

arXiv

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arXiv 2018年

作者： Curty, Marcos Azuma, Koji Lo, Hoi-Kwong Escuela de Ingeniería de Telecomunicación Dept. of Signal Theory and Communications University of Vigo VigoE-36310 Spain NTT Basic Research Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa243-0198 Japan NTT Research Center for Theoretical Quantum Physics NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa243-0198 Japan Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering Department of Physics University of Toronto TorontoONM5S 3G4 Canada

Twin-field (TF) quantum key distribution (QKD) was conjectured to beat the private capacity of a point-to-point QKD link by using single-photon interference in a central measuring station. This remarkable conjecture has recently triggered an intense research activity to prove its security. Here, we introduce a TF-type QKD protocol which is conceptually simpler than the original proposal. It relies on local phase randomization, instead of global phase randomization, which significantly simplifies its security analysis and is arguably less demanding experimentally. We demonstrate that the secure key rate of our protocol has a square-root improvement over the point-to-point private capacity, as conjectured by the original TF-QKD scheme. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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