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作者： Abdirahmani, Aliasghar Angulo, Cecilio Automatic Control Dept. Universitat Politècnica de Catalunya Pau Gargallo 14. BacelonaTech08028 Spain Knowledge Engineering Research Group Intelligent Data Science and Artificial Intelligence Research Center Univ. Politècnica Catalunya BarcelonaTech Spain

ISBN: (纸本)9781614999171

Social media is a phenomenon that has transformed the interaction and communication of individuals throughout the world. In recent times, social media has affected many aspects of human communication, as well as business. The main objective of our research is to figure out about the role of Twitter on stock market to find out how social media impacts on the business that predictions fail. © 2018 The authors and IOS Press.

关键词： Sentiment analysis

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A driver node selection strategy for minimizing the control energy in complex networks

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IFAC-PapersOnLine 2017年第1期50卷 8309-8314页

作者： Lindmark G. Altafini C. Division of Automatic Control Dept. of Electrical Engineering Linköping University Linköping SE-58183 Sweden

This paper deals with the problem of controlling linear complex networks in an efficient way, i.e., with limited control energy. A general principle is provided, based on the eigenvalues of the network. It is shown numerically that the cost of controlling a network grows with the (absolute value of the) real part of the eigenvalues of the adjacency matrix. Constructive rules for driver node selection are also provided, based on the (weighted) topology of the network. In particular, we show that the key to have an energetically efficient driver node placement strategy is to use the skewness of the outdegree versus indegree distributions of the network, a topological property not associated before to controllability. © 2017

关键词： Complex networks controllability Degree distributions Gramian Reachability

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Minimum energy control for networks of coupled harmonic oscillators

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IFAC-PapersOnLine 2017年第1期50卷 8321-8326页

作者： Lindmark G. Altafini C. Division of Automatic Control Dept. of Electrical Engineering Linköping University Linköping SE-58183 Sweden

The aim of this paper is to investigate the problem of selecting driver nodes enabling the control of a network with minimal control energy. The networks we are interested in are coupled harmonic oscillators, i.e., networks in which the eigenvalues are all purely imaginary. For them, several criteria for driver node selection are presented, based on the different measures of control energy considered in this context. The constructive algorithms we develop for these criteria are normally solving the problem in a heuristic way, although in one case the exact solution can be computed efficiently regardless of size. © 2017

关键词： Complex networks controllability Gramian Harmonic Oscillators Minimum energy control

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Topological aspects of controlling large scale networks with unilateral inputs

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IFAC-PapersOnLine 2017年第1期50卷 8315-8320页

作者： Lindmark G. Altafini C. Division of Automatic Control Dept. of Electrical Engineering Linköping University Linköping SE-58183 Sweden

In this paper, we study the problem of controlling complex networks with unilateral controls, i.e., controls which can assume only positive or negative values, not both. Given a network with linear dynamics represented by the adjacency matrix A, we seek to understand the minimal number of unilateral controls that renders the network controllable. This problem has structural properties that for instance allows us to establish theoretical bounds and identify key topological properties that makes a network relatively easy to control with unilateral controls as compared to unrestricted controls. We find that the structure of the left null space of A is particularly important to this end. In a computational study we find that the network topology largely determines the number of unilateral controls and that the derived lower bounds often are achieved with heuristic methods. © 2017

关键词： Complex networks controllability Network topology Unilateral inputs

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control developments in power electronics-based distributed generators for future grid services

Control developments in power electronics-based distributed ...

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Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion (MEDPOWER 2018)

作者： Miguel Castilla Luis García de Vicuña Jaume Miret Antonio Camacho Ramón Guzmán Dept. of Electronic Engineering Technical University of Catalonia Vilanova i la Geltrú Spain Dept. of Automatic Control Technical University of Catalonia Vilanova i la Geltrú Spain

ISBN: (纸本)9781839531330

This paper presents practical experiences in an inverter-based microgrid installed at SEPIC research laboratory (Technical University of Catalonia, Spain). These experiences validate recent developments in the control of power electronics-based distributed generators which confirm the opportunity to provide auxiliary services for the utility grid. Harmonic rejection, voltage imbalance reduction, fault-ride through capability, and voltage and frequency regulation are some of the auxiliary services designed to improve the power quality of the future grid.

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Geometric nonlinear damper design-A frequency based approach 3

Geometric nonlinear damper design-A frequency based approach

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3rd IEEE International Conference on Electro-Technology for National Development, NIGERCON 2017

作者： Uchenna, Diala Okafor, K.C. Zi-Qiang, Lang Dept. of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Dept. of Mechatronics Engineering Federal University of Technology Owerri Nigeria

ISBN: (纸本)9781509064229

In this study, the vibration transmissibility of a single-degree-of-freedom (SDOF) with a linear damper having a configuration perpendicular to a linear vertical spring is analyzed using a nonlinear frequency analysis method. The concept of the output frequency response function (OFRF) is employed to derive an explicit polynomial relationship between the system output response (relative displacement of the mass) and the parameter of interest which is the nonlinear damping coefficient. With the derived OFRF polynomial, various damping parameters were designed for desired output responses. © 2017 IEEE.

关键词： Degrees of freedom (mechanics)

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Active noise control with online feedback-path modeling using adaptive notch filter

Active noise control with online feedback-path modeling usin...

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International Conference on Advanced Mechatronic Systems (ICAMechS)

作者： Tao Bai Yegui Xiao Yaping Ma Jianming Ding Jianhui Lin Dept. of Management & Information Syst. Prefectural University of Hiroshima Japan Dept. of Automatic Testing & Control Harbin Institute of Technology Harbin China Dept. of Mechnical Engineering Southwest Jiaotong University Chengdu China

The feedback path (FBP) compensation has been a research topic in the field of active noise control (ANC) for decades and a number of offline and online FBP modeling techniques have been proposed in the literature. In this paper, a novel ANC system equipped with an online FBP modeling (FBPM) and neutralization (FBPMN) subsystem is proposed. The new system consists of three adaptive subsystems, namely 1) ANC controller with only two weights for each frequency target, 2) second-order adaptive IIR notch filter, and 3) an FBPMN filter. It yields very promising performance for narrowband noise signals generated by rotating machines such as fans, motors, large-scale strandcutters, etc. An auxiliary white Gaussian noise is injected into the ANC system to implement the FBPMN, which is scaled by a function of the residual noise to reduce its contribution to the residual noise power. Extensive simulations with synthetic/real secondary paths reveal that the proposed ANC scheme ensures excellent noise reduction performance as well as practically attractive computational efficiency.

关键词： AWGN Finite impulse response filters Noise reduction Adaptive systems Computational modeling Convergence Adaptation models

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Formation control of Surface Marine Vehicles for Underwater Target Tracking Using Range Information

Formation Control of Surface Marine Vehicles for Underwater ...

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APCA International Conference on automatic control and Soft Computing (controlO)

作者： D. Moreno-Salinas N. Crasta A.M. Pascoal J. Aranda Dept. of Computer Science and Automatic Control National Distance Education University Madrid Spain Department of Electrical Engineering ISR/IST University of Lisbon Lisbon Portugal

In many of the marine applications, the availability of an accurate system to localize underwater targets using a group of surface vehicles equipped with acoustic sensors is of paramount importance. In this context, the surface vehicles must keep a well-defined formation with respect to the targets so as to maximize the range-based information available for target localization. In this paper, a target position estimation algorithm together with a simple formation control law to maintain an optimal configuration that maximizes range-related information for target localization and tracking are presented. The setup studied consists of a group of surface vehicles moving in formation and a target performing a predefined mission. The optimal formation is computed by maximizing the determinant of an appropriately defined Fisher information matrix (FIM), subject to inter-vehicle collision avoidance and vehicle manoeuvring constraints. A centralized approach for the formation control is considered, where the trajectory planning is carried out by a supervisor that computes the control actions for each agent. The formation control is complemented with a collision avoidance logic based on a discrete event law. Simulations show that this strategy leads to an interesting and well defined behavior of the formation for localization and tracking.

关键词： Target tracking Collision avoidance Robot sensing systems Estimation Position measurement Mobile robots

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Reliability Analysis of Cyber-Physical Systems

Reliability Analysis of Cyber-Physical Systems

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International Conference on Industrial engineering, Applications and Manufacturing (ICIEAM)

作者： D.S. Obychaiko V.A. Shikhin George Chrysostomou Department of Control and Informatics National Research University “Moscow Power Engineering Institute” Moscow Russia General Dept. Frederick University Nicosia Cyprus

ISBN: (纸本)9781538643082

A formalized representation of cybernetic and physical components for cyber-physical systems (CPS) is proposed. It matches numerical procedures' design for operational reliability analysis of multi-component industrial systems. The reliability indices are supposed to be estimated for the systems subject to intensive industrial exploitation. The viability for CPS is executed through the artificial neural networks (ANN s) mathematical model application. For this purpose the next outputs of the integrated model CPS+ ANN are calculated: the equipment conflict rate factor, the information completeness factor, the reliability index and the operator activity coefficient which is an important indicator for the system's ability to function in a fully automatic mode. The ANNs tuning utilizes the information on the states of physical components and cybernetic components via accessible historical data and experts' knowledge treatment. A digital electrical substation (DSS) is discussed as a demonstration example of the CPS. The reviewed example allows one to clearly present the proposed approach and algorithm.

关键词： Reliability Cybernetics Substations control systems Process control Cyber-physical systems Servers

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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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