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Double Deployment of Delayed Resonator in Active Vibration Suppression

IFAC-PapersOnLine 2019年第18期52卷 115-120页

作者： Vladimír Kućera Jaromír Fišer Tomàš Vyhlídal Dept. Instrumentation and Control Engineering Faculty of Mechanical Engineering Czech Technical University in Prague Prague 6 Czech Republic Dept. Instrumentation and Control Engineering Faculty of Mechanical Engineering and Czech Institute of Informatics Robotics and Cybernetics Czech Technical University in Prague Prague 6 Czech Republic

In the paper a proposal of active vibration suppression is made for the two-degree-of-freedom primary structure. The active vibration suppression of both masses of the primary structure is achieved by applying the absorber attached to every mass. The absorbers used are the delayed resonators which are tuned by delayed acceleration feedback. The delayed resonators are tuned separately, i.e. the tuning is provided for every mass of the primary structure where each mass is excited by its own external force. Both delayed resonator tunings are performed with respect to the suppression of both external forces and at the same time the stability guarantee of overall structure system. This system due to two feedback delays results in neutral-type system that requires demanding stability investigation. Finally the application example based on the simulation study on laboratory setup vibration suppression shows the effect of the delayed resonator tunings for the vibration suppression.

关键词： Vibration suppression delayed feedback resonators two-degree-of-freedom structure neutral system

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PID controller Tuning via Dominant Pole Placement in Comparison with Ziegler-Nichols Tuning

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IFAC-PapersOnLine 2019年第18期52卷 43-48页

作者： Jaromír Fišer Pavel Zítek Dept. Instrumentation and Control Engineering Faculty of Mechanical Engineering and Czech Institute of Informatics Robotics and Cybernetics Czech Technical University in Prague Prague 6 Czech Republic Dept. Instrumentation and Control Engineering Faculty of Mechanical Engineering“ Czech Technical University in Prague Prague 6 Czech Republic

The paper provides PID controller tuning for the third-order plants with delay. For obtaining the PID setting the dominant three-pole placement is applied to achieve desired dynamics. This dynamics is proposed such that to overcome well-known Ziegler-Nichols (Z-N) tuning rule. The desired dynamics proposal is found out by the integrated absolute error (IAE) optimization of the fourth-order PID control loop with delay. The initial guess for this optimization is based on ultimate frequency assessment and the IAE optimization is performed with respect to disturbance rejection. The dominant three-pole placement approach to the PID tuning is designed for oscillatory, aperiodic and integrating plants of the third-order. On examples the proposed PID tuning is demonstrated overcoming the Z-N tuning.

关键词： dominant pole placement Ziegler-Nichols tuning rule ultimate frequency disturbance rejection three term controller

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Comprehensive review of models and methods for inferences in bio-chemical reaction networks

arXiv

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arXiv 2019年

作者： Loskot, Pavel Atitey, Komlan Mihaylova, Lyudmila College of Engineering Swansea University Swansea United Kingdom Dept. of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

Key processes in biological and chemical systems are described by networks of chemical reactions. From molecular biology to biotechnology applications, computational models of reaction networks are used extensively to elucidate their non-linear dynamics. Model dynamics are crucially dependent on parameter values which are often estimated from observations. Over past decade, the interest in parameter and state estimation in models of (bio-) chemical reaction networks (BRNs) grew considerably. Statistical inference problems are also encountered in many other tasks including model calibration, discrimination, identifiability and checking as well as optimum experiment design, sensitivity analysis, bifurcation analysis and other. The aim of this review paper is to explore developments of past decade to understand what BRN models are commonly used in literature, and for what inference tasks and inference methods. Initial collection of about 700 publications excluding books in computational biology and chemistry were screened to select over 260 research papers and 20 graduate theses concerning estimation problems in BRNs. The paper selection was performed as text mining using scripts to automate search for relevant keywords and terms. The outcome are tables revealing the level of interest in different inference tasks and methods for given models in literature as well as recent trends. In addition, a brief survey of general estimation strategies is provided to facilitate understanding of estimation methods which are used for BRNs. Our findings indicate that many combinations of models, tasks and methods are still relatively sparse representing new research opportunities to explore those that have not been considered - perhaps for a good reason. The most common models of BRNs in literature involve differential equations, Markov processes, mass action kinetics and state space representations whereas the most common tasks in cited papers are parameter inference and model ident

关键词： Surveys

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Comparison of the Effectiveness of Various Structures of Regulators for controlling an Object of the Sixth Order

Comparison of the Effectiveness of Various Structures of Reg...

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2019 International Multi-Conference on engineering, Computer and Information Sciences, SIBIRCON 2019

作者： Zhmud, Vadim Dimitrov, Lubomir Nosek, Jaroslav Roth, Hubert Novosibirsk State Technical University Dept. of Automation Novosibirsk Russia Technical University of Sofia Sofia Bulgaria Technical University of Liberec Faculty of Mechatronics Computer Science and Interdisciplinary Research Liberec Czech Republic University of Siegen Department of Automatic Control Engineering Siegen Germany Germany

ISBN: (纸本)9781728144016

Object control requires the calculation of a regulator. One of the most effective methods for calculating the regulator is the method of numerical optimization of the regulator. This paper discusses the solution of the problem of controlling a linear object of the sixth order, the parameters of which are such that this high order significantly and negatively affects the possibilities of successfully managing this object. Using the traditional approach to the design problem of the controller (regulator) allows us to formally solve the problem;however, the result of this solution is not satisfactory. The use of additional derivation does not give any noticeable improvement. A solution to this problem is proposed by using pseudo-local feedback, moreover, this connection is supposedly most effective if it covers one of two identical links in the object model. This allows for a smoother attenuation of the frequency response of the object in the region where the action of these two links begins to affect. For pseudo-local communication, an additional PID controller is used, the coefficients of which are also determined by the method of numerical optimization. The optimization result allows us to conclude that the presence of an integral element in this controller is optional. The calculation result of such a composite controller meets the most stringent requirements for the quality of control, since in such a system the speed is increased at least twice, the oscillations, which were about 10% in amplitude, are completely eliminated, the robustness of the system is ensured, which is verified by changing all the controller coefficients by 5% up and down, and also by changing the time constant of the element of the pseudolocal loop by 10% up and down, changes in the transition process of the system in this case remain are acceptable. © 2019 IEEE.

关键词： Feedback

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Text Mining of Medical Records

Text Mining of Medical Records

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E-Health and Bioengineering Conference (EHB)

作者： Irina Andra Tache Monica Dragoicea Elena-Simona Apostol Ciprian-Octavian Truica Dept. of Automatic Control and Systems Engineering University Politehnica of Bucharest Bucharest Romania Computer Science and Engineering Department University Politehnica of Bucharest Bucharest Romania

The patients with cardiovascular diseases undergo complex medical procedures, including medical imaging, blood biochemistry analysis, physical examination, etc. The digitization of information is an intensive process in e-health therefore, in this paper there are presented some methods to extract important data from medical records of patients suffering from coronary artery diseases organized in PDF files.

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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： Castilla, Miguel De Vicuña, Luis García Miret, Jaume Camacho, Antonio Guzmán, Ramón 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. © 2018 Institution of engineering and Technology. All rights reserved.

关键词： Power electronics

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Universal mutual information privacy guarantees for smart meters

arXiv

引用

arXiv 2019年

作者： Arrieta, Miguel Esnaola, Iñaki Effros, Michelle Dept. of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom Dept. of Electrical Engineering Princeton University PrincetonNJ08544 United States Dept. of Electrical Engineering California Institute of Technology PasadenaCA91125 United States

Smart meters enable improvements in electricity distribution system efficiency at some cost in customer privacy. Users with home batteries can mitigate this privacy loss by applying charging policies that mask their underlying energy use. A battery charging policy is proposed and shown to provide universal privacy guarantees subject to a constraint on energy cost. The guarantee bounds our strategy's maximal information leakage from the user to the utility provider under general stochastic models of user energy consumption. The policy construction adapts coding strategies for non-probabilistic permuting channels to this privacy problem. Copyright © 2019, The Authors. All rights reserved.

关键词： Smart meters

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Microgrid control simulation and testing

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical engineering and Computer Science 2018年第2期80卷 57-68页

作者： Puianu, Mihaela Flangea, Ramona-Oana Arghira, Nicoleta Iliescu, Sergiu Stelian Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Dept. of Automatic Control and Industrial Informatics University POLITEHNICA of Bucharest Romania

Microgrid control becomes more and more developed with the application of this concept on a larger scale. This paper defines the modern microgrid concept and evaluates the possible architectures and control hierarchy. A small scale microgrid architecture is proposed. The components of the system are a wind turbine, a photovoltaic panel and a household. The model was implemented in Matlab/Simulink and a decision table control was proposed. The proposed decisions and actions are defined for both on and off grid operation, in order to benefit most of the local resources. The results of this study are promising in terms of microgrid off grid operation for single dwellings, considering that the house is grid supplied for a period of only 4 hours of the day. © 2018 Politechnica University of Bucharest. All rights reserved.

关键词： Decision tables

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3D-FDTD Computation of Lightning Electromagnetic Fields in the Presence of a Mountain and a River

3D-FDTD Computation of Lightning Electromagnetic Fields in t...

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International Symposium on Lightning Protection (XII SIPDA)

作者： Kaddour Arzag Zin-Eddine Azzouz Yoshihiro Baba Dept. of Electrotechnics UTMS of Saida LDEE Lab. USTO-MB Saida Algeria Dept. of Automatic and Control USTO-MB oran LDEE Lab. USTO-MB Oran Algena Dept. of Electrical Engineering Doshisha University Kyoto Japan

In this paper, we studied the influence of the presence of a wide river on electromagnetic fields generated by lightning strikes to a tall tower located on a high mountain, using the three-dimensional finite-difference time-domain method. In the computations, the lightning channel and the tower are represented by the transmission line model extended to include a tall strike object. Electromagnetic fields are computed at different points located in the river and above the ground. It is shown that the peak value and the electromagnetic field waveforms, computed at the considered observation points, are significantly affected by the presence of the river.

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Bidirectional isolated DC-DC converter with unity gain for low power applications 10

Bidirectional isolated DC-DC converter with unity gain for l...

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10th International Conference on Electrical and Computer engineering, ICECE 2018

作者： Hasan, Md. Nazmul Rodriguez, Ramon Estalella Martinez-Salamero, Luis Martinez, Carlos Olalla Universitat Rovira i Virgili Electronic and Automatic Control Engineering Dept. of Electrical Tarragona Spain Department of Electrical and Electronic Engineering International Islamic University Chittagong Chittagong Bangladesh

ISBN: (纸本)9781538674826

This paper presents the architecture and control of a LLC bidirectional isolated DC-DC converter with unity gain for low power application. The converter features zero voltage switching (ZVS) at light loads, which results in reduced switching loss and thus improves the efficiency. Further improvement of the efficiency has been achieved by operating the converter in burst mode with a constant switching frequency. A control scheme that allows bidirectional power flow is proposed. High frequency ferrite core transformer provides the galvanic isolation between primary and secondary. In addition, resonant inductors have been integrated in the transformer, which reduces the size and cost of the converter. Experimental results show power transfer efficiencies more than 90 % for loads between 1 W to 8 W. © 2018 IEEE.

关键词： Zero voltage switching

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