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arXiv 2019年

作者： Gent, Frederick A. Snow, Ben Fedun, Viktor Erdélyi, Robertus Academy of Finland ReSoLVE Centre of Excellence Department of Computer Science Aalto University FI-02150 Finland College of Engineering Mathematics and Physical Sciences University of Exeter EX4 4QF United Kingdom School of Mathematics Statistics and Physics Newcastle University NE1 7RU United Kingdom School of Mathematics and Statistics University of Sheffield S3 7RH United Kingdom Plasma Dynamics Group Department of Automatic Control and Systems Engineering University of Sheffield S1 3JD United Kingdom Department of Astronomy Eötvös Loránd University Pázmány Péter sétány 1/A Budapest H-1117 Hungary

The magnetic network extending from the photosphere (solar radius ' R) to lower corona (R + 10 Mm) plays an important role in the heating mechanisms of the solar atmosphere. Here we further develop the models with realistic open magnetic flux tubes of the authors in order to model more complicated configurations. Closed magnetic loops, and combinations of closed and open magnetic flux tubes are modelled. These are embedded within a stratified atmosphere, derived from observationally motivated semi-empirical and data-driven models subject to solar gravity and capable of spanning from the photosphere up into the chromosphere and lower corona. Constructing a magnetic field comprising self-similar magnetic flux tubes, an analytic solution for the kinetic pressure and plasma density is derived. Combining flux tubes of opposite polarity it is possible to create a steady background magnetic field configuration modelling a solar atmosphere exhibiting realistic stratification. The result can be applied to SOHO/MDI and SDO/HMI and other magnetograms from the solar surface, upon which photospheric motions can be simulated to explore the mechanism of energy transport. We demonstrate this powerful and versatile method with an application to Helioseismic and Magnetic Imager data. Copyright © 2019, The Authors. All rights reserved.

关键词： 3D modeling

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Porous cylinder subjected to conjugate heat transfer-part II

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AIP Conference Proceedings 2019年第1期2200卷

作者： Maughal Ahmed Ali Baig Azeem Maneiah Dakkili B. Sridhar Babu 1Department of Mechanical Engineering CMR Technical Campus Hyderabad India 2Department of Mathematics and Computer Science Taylor’s University No. 1 Jalan Taylor’s Subang Jaya - 47500 Selangor DarulEhsan Malaysia 3Department of Mechanical Engineering CMR Institute of Technology Hyderabad India

Conjugate heat transfer due to the solid at the inner surface is investigated when the outer surface is heated to hot temperature and inner surface is maintained at lower temperature. The present article is continuation of the article that discussed the effect of physical parameters. This article is specifically focused to discuss the geometric parameters such as aspect ratio, radius ratio and the solid width radio on heat transfer characteristics. Finite element method is used to solve the equations derived from basic principles to represent momentum equation, energy equation and the conduction equation in solid wall.

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Preface Symposium N°63: Geomatics Approaches for Environmental Surveying and Modelling

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AIP Conference Proceedings 2019年第1期2116卷

作者： Mangiameli Michele Muscato Giovanni Mussumeci Giuseppe Carmelo Donato Melita 1Department of Civil Engineering and Architecture (DICAR) University of Catania Viale Andrea Doria 6 95125 Catania Italy 2Department of Electrical Electronics and Computer Engineering (DIEEI) University of Catania Viale Andrea Doria 6 95125 Catania Italy

Mangiameli Michele, Muscato Giovanni, Mussumeci Giuseppe, Carmelo Donato Melita; Preface Symposium N°63: Geomatics Approaches for Environmental Surveying and Mo

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Statistical lamb wave localization based on extreme value theory

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AIP Conference Proceedings 2018年第1期1949卷

作者： Joel B. Harley 1Department of Electrical and Computer Engineering University of Utah USA

Guided wave localization methods based on delay-and-sum imaging, matched field processing, and other techniques have been designed and researched to create images that locate and describe structural damage. The maximum value of these images typically represent an estimated damage location. Yet, it is often unclear if this maximum value, or any other value in the image, is a statistically significant indicator of damage. Furthermore, there are currently few, if any, approaches to assess the statistical significance of guided wave localization images. As a result, we present statistical delay-and-sum and statistical matched field processing localization methods to create statistically significant images of damage. Our framework uses constant rate of false alarm statistics and extreme value theory to detect damage with little prior information. We demonstrate our methods with in situ guided wave data from an aluminum plate to detect two 0.75 cm diameter holes. Our results show an expected improvement in statistical significance as the number of sensors increase. With seventeen sensors, both methods successfully detect damage with statistical significance.

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A decision-making framework for robust multi-agent systems in risky communication scenarios

A decision-making framework for robust multi-agent systems i...

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AIAA Information Systems-AIAA Infotech at Aerospace, 2018

作者： Samiei, Arezoo Hu, Bin Zhao, Shiyu Sun, Liang Klipsch School of Electrical and Computer Engineering New Mexico State University Thomas & Brown Hall 1125 Frenger Mall Las CrucesNM88003 United States Department of Engineering Technology Old Dominion University Kaufman Hall 211C NorfolkVA23529 United States Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Department of Mechanical and Aerospace Engineering New Mexico State University Jett Hall Rm. 104 1040 S. Horseshoe Street Las CrucesNM88003 United States

ISBN: (数字)9781624105272

ISBN: (纸本)9781624105272

In this paper, we present a novel decision-making framework to characterize the communication status of a distributed multi-agent system. The theoretical package dropout probability (PDP) in communication is formulated as a function of the inter-distance between agents. A statistical representation is adopted to describe the actual value of the PDP. The communication status, formulated as a binary variable, is then determined by the comparison between the theoretical PDP and its statistical representation. To handle the unexpected degradation/loss of the communication network, an algorithm is proposed to quickly examine the robustness of the communication network in the case of single-node failure, i.e., the biconnectivity of a graph. The proposed framework is tested in scenarios of changing formation and temporary- and permanent-loss of communication. © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Multi agent systems

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Trends in animal welfare and veterinary informatics

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AIP Conference Proceedings 2019年第1期2140卷

作者： D. I. Kaplun A. M. Sinitca S. A. Romanov A. Zamansky S. Bleuer-Elsner D. van der Linden 1Department of Automation and Control Processes Saint Petersburg Electrotechnical University “LETI” 197376 Saint Petersburg Russia 2Department of Information Systems University of Haifa 3498838 Haifa Israel 3Department of Computer Science University of Bristol Bristol BS8 1QU UK

The field of veterinary healthcare informatics is still in its infancy, and state of the art solutions from human healthcare are not easily adapted. Internet of Things and wearable technologies, as well as recent developments in telehealth legislation may be bringing a wind of change, making it a timely moment to initiate a discussion on the possibilities for cross-fertilization between the worlds of human and animal health informatics. In this paper, we review recent developments in animal welfare and veterinary informatics and highlight some challenges and opportunities.

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Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

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IFAC-PapersOnLine 2017年第1期50卷 7824-7829页

作者： Gadelovits S. Zhong Q.-C. Konstantopoulos G.C. Kadirkamanathan V. Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield S1 3JD United Kingdom Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL 60616 United States

In this paper a new filter design for the Uncertainty and Disturbance Estimator (UDE) is proposed to reject periodical disturbances when a limited bandwidth is required for the control output. The motivation comes from several applications where the system actuator may introduce a bandwidth limitation, as a result of internal delays, or when the actuator itself is a limited bandwidth closed-loop system. When the traditional UDE approach is applied in these systems, the stability requirements impose a limitation over the effective bandwidth of the UDE filter and therefore disturbances cannot be fully rejected by the filter. In the case where the expected disturbance is periodical with a known fundamental frequency, the proposed UDE filter is designed as a chain of filters to match selected bands of the expected disturbance spectrum and fully reject them while maintaining the desired stability margins. A design example of a power inverter application is investigated and extensive simulation results are provided to verify the proposed UDE filter design. © 2017

关键词： disturbance estimator disturbance rejection limited bandwidth design power systems stability margins Uncertainty

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Nonlinear optimal control for ship propulsion with the use of an induction motor and a drivetrain 5

Nonlinear optimal control for ship propulsion with the use o...

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5th International Conference of engineering Against Failure, ICEAF-V 2018

作者： Rigatos, Gerasimos Busawon, Krishna Serpanos, Dimitrios Siadimas, Vasilios Siano, Pierluigi Abbaszadeh, Masoud Unit of Industrial Automation Industrial Systems Institute Rion Patras26504 Greece Nonlinear Control Group University of Northumbria NewcastleNE1 8ST United Kingdom Industrial Systems Institute RC Athena Rion Patras26504 Greece Department of Electrical and Computer Engineering University of Patras Rion Patras26504 Greece Department of Industrial Engineering University of Salerno Fisciano84084 Italy GE Global Research General Elecric NiskayunaNY12309 United States

A nonlinear optimal (H-infinity) control method is proposed for an electric ship's propulsion system that consists of an induction motor, a drivetrain and a propeller. The control method relies on approximate linearization of the propulsion system's dynamic model using Taylor-series expansion and on the computation of the state-space description's Jacobian matrices. The linearization takes place around a temporary equilibrium which is recomputed at each time-step of the control method. For the approximately linearized model of the ship's propulsion system, an H-infinity (optimal) feedback controller is developed. For the computation of the controller's gains an algebraic Riccati equation is solved at each iteration of the control *** stability properties of the control method are proven through Lyapunov analysis, © The Authors, published by EDP Sciences, 2018.

关键词： Linearization

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Condition monitoring for the quadruple water tank system using H-infinity Kalman Filtering 5

Condition monitoring for the quadruple water tank system usi...

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5th International Conference of engineering Against Failure, ICEAF-V 2018

作者： Rigatos, Gerasimos Serpanos, Dimitrios Siadimas, Vasilios Busawon, Krishna Gao, Zhiwei Siano, Pierluigi Abbaszadeh, Masoud Unit of Industrial Automation Industrial Systems Institute Rion Patras26504 Greece Industrial Systems Institute RC Athena Rion Patras26504 Greece Department of Electrical and Computer Engineering University of Patras Rion Patras26504 Greece Nonlinear Control Group University of Northumbria NewcastleNE1 8ST United Kingdom Department of Industrial Engineering University of Salerno Fisciano84084 Italy GE Global Research General Elecric NiskayunaNY12309 United States

The problem of statistical fault diagnosis for the quadruple watertanks system is examined. The solution of the fault diagnosis problem for the dynamic model of the four-water tanks system is a non-trivial case, due to nonlinearities and the system's multivariable structure. In the article's approach, the system's dynamic model undergoes first approximate linearization around a temporary operating point which is recomputed at each sampling period. The linearization procedure relies on Taylor series expansion and on the computation of the Jacobian matrices of the state-space description of the system. The H-infinity Kalman Filter is used as a robust state estimator for the approximately linearized model of the quadruple water tanks system. By comparing the outputs of the H-infinity Kalman Filter against the outputs measured from the real water tanks system the residuals sequence is generated. It is concluded that the sum of the squares of the residuals' vectors, being weighted by the inverse of the associated covariance matrix, stands for a stochastic variable that follows the χ2 distribution. As a consequence, a statistical method for condition monitoring of the quadruple water tanks system is drawn, by using the properties of the χ2 distribution and the related confidence intervals. Actually, normal functioning can be ensured as long as the value of the aforementioned stochastic variable stays within the previously noted confidence intervals. On the other side, one can infer the malfunctioning of the quadruple water tanks system with a high level of certainty (e.g. of the order of 96% to 98%), when these confidence intervals are exceeded. The article's method allows also for fault isolation, that is for identifying the specific component of the quadruple water tanks system that has been subject to fault or cyber-attack. © The Authors, published by EDP Sciences, 2018.

关键词： Water tanks

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Study of low-cost IoT application for industry 4.0 using NodeMCU ESP8266 module

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AIP Conference Proceedings 2019年第1期2088卷

作者： Andi Rahmadiansah Sasangka Wira Utama Wirayusa 1Department of Engineering Physics Center of Excellent in Automotive Control & System (PUI-SKO) Sepuluh Nopember Institute of Technology. Surabaya Indonesia 2Department of Engineering Physics Computation & Cyber-Physical System Laboratory Sepuluh Nopember Institute of Technology. Surabaya Indonesia

Currently the application of Industry 4.0 is being promoted in Indonesia, among others, in systems in industry, medical, transportation, agriculture, and public services. This has encouraged the implementation of The Internet of Things (IoT) technology. The implementation of IoT in the industry there is no price problem, but in the low profit sectors the use of the industry standard IoT system is a problem. Therefore, this paper will provide the results of the study on the use of Low-Cost IoT. The most important parameter of an IoT system is the performance of sending data from the device to the server and reversing from the server to the user. IoT devices use the NodeMCU ESP8266 module on the Ubidots platform for free. Based on the design that has been carried out, the delivery time performance of IoT to Server devices for fiber optic media and 4G cellular operators is 1-2 milliseconds and 2-7 milliseconds respectively. This value according to the standard is still very good even though using unpaid services.

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