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作者： Aranovskiy, Stanislav Bobtsov, Alexey A. Pyrkin, Anton A. Ortega, Romeo Chaillet, Antoine Department of Control Systems and Informatics ITMO University St. Petersburg Russia Laboratory "Control of Complex Systems" Institute for Problems of Mechanical Engineering St. Petersburg Russia Laboratoire des Signaux et Systèmes CNRS-SUPELEC Plateau du MoulonGif-sur-Yvette91192 France

In this paper we propose a flux and position observer for permanent magnet synchronous motors when voltages, currents and rotor speed are available for measurement. We prove that this observer converges under weaker assumptions than the classical persistence of excitation condition. Simulations confirm the eficacy of the proposed observer and show that it can cope with imprecision in rotor speed measurement, which allows to use an estimator when the speed cannot be measured directly. © 2015

关键词： Permanent magnets

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Modelling and control of Raw Hide Desalting Process

Modelling and Control of Raw Hide Desalting Process

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2015 International Conference on Environmental Science and Energy engineering(ICESEE 2015)

作者： Vladimir VASEK Dagmar JANACOVA Karel KOLOMAZNIK Pavel MOKREJS Department of Automation and Control Engineering Faculty of Applied Informatics Faculty of Technology Tomas Bata University in Zlín

The contribution deals with optimizing of desalting process during soaking and application of automatic control via microcomputer technology in leather manufacturing industry on the base mathematics deterministic diffusion model describing desalting *** of raw hides comprises a series of particular processes through which raw hide is progressively transformed into the *** a combination of mathematical modelling and laboratory testing by automatic control system we search an optimal procedure for desalting with regard to ecological and economic *** this paper we describe testing of desalting in the flow systems with flow rate automatic *** obtained results confirm the elimination of concentration shocks which cause the collapse of the surface layer texture of cured hide.

关键词： Desalting Raw hide Tannery technology Mathematical model Measuring and control microcomputer system Simulation

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Bayesian network early reliability evaluation analysis for both permanent and transient faults

Bayesian network early reliability evaluation analysis for b...

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IEEE Symposium on On-Line Testing (IOLTS)

作者： A. Vallero A. Savino S. Tselonis N. Foutris M. Kaliorakis G. Politano D. Gizopoulos S. Di Carlo Control and Computer Engineering Department Politecnico di Torino Torino Italy Department of Informatics & Telecommunications University of Athens Athens Greece

ISBN: (纸本)9781467379069

Analyzing the impact of software execution on the reliability of a complex digital system is an increasing challenging task. Current approaches mainly rely on time consuming fault injections experiments that prevent their usage in the early stage of the design process, when fast estimations are required in order to take design decisions. To cope with these limitations, this paper proposes a statistical reliability analysis model based on Bayesian Networks. The proposed approach is able to estimate system reliability considering both the hardware and the software layer of a system, in presence of hardware transient and permanent faults. In fact, when digital system reliability is under analysis, hardware resources of the processor and instructions of program traces are employed to build a Bayesian Network. Finally, the probability of input errors to alter both the correct behavior of the system and the output of the program is computed. According to experimental results presented in this paper, it can be stated that Bayesian Network model is able to provide accurate reliability estimations in a very short period of time. As a consequence it can be a valid alternative to fault injection, especially in the early stage of the design.

关键词： Reliability Hardware Bayes methods Registers Software Estimation Analytical models

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Investigation of 3D SPECT reconstruction with multi-energy photon emitters 1 9

Investigation of 3D SPECT reconstruction with multi-energy p...

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9th IFAC Symposium on Biological and Medical Systems, BMS 2015

作者： Hesz, G. Szlávecz, Á. Kovács, K. Benyó, B. Department of Control Engineering and Information Technology Budapest University of Technology and Economics Magyar tudósok körútja 2 BudapestH-1117 Hungary Department of Informatics Széchenyi István University Egyetem tér 1. GyorH-9026 Hungary

Parallel projection based Single Emission Computed Tomography is a widely used nuclear imaging technique. Non-homogeneous attenuation medium and the distance dependent spacial resolution (DDSR) of the parallel imaging cause serious artefacts during image reconstruction. Both effects are dependent on the energy of gamma photons used for imaging. In this paper an efficient parallel reconstruction algorithm is introduced that is executed on the Graphics Processing Unit. The aim of the presented study was to investigate the possibilities of reconstruction techniques when multi-energy photon emitters are used. An analytical 3D projector with attenuation and detector response modelling was used to generate projection sets for Gallium-67 isotope studies. Data were reconstructed from one photopeak only using the corresponding attenuation map. The projection data sets were added together and reconstructed using average attenuation and DDSR compensation values as well as simulating every photopeak individually. The third combined reconstruction technique was using every projection set as separate measurement. In this study we showed that all three strategies result in similar image quality, however the average attenuation correction method is computationally less demanding. © 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Image reconstruction

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Output Adaptive controller for a Class of MIMO Systems with Input Delay and Multisinusoidal Disturbance

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IFAC-PapersOnLine 2015年第11期48卷 892-899页

作者： Wang J. Vedyakov A.A. Vediakova A.O. Pyrkin A.A. Bobtsov A.A. Shavetov S.V. Institute of Automation Hangzhou Dianzi University Xiasha Higher Education Zone Hangzhou Zhejiang Province 310018 China Department of Control Systems and Informatics ITMO University St. Petersburg Russian Federation Saint Petersburg State University St. Petersburg Russian Federation Laboratory “Control of Complex Systems” Institute for Problems of Mechanical Engineering St. Petersburg Russian Federation

We present a new output control approach for a class of MIMO systems with the input delay and unknown multisinusoidal disturbance affected the inputs and the outputs. We combine the well-known predictor feedback approach with the state observer and adaptive scheme for feed-forward disturbance rejection based on disturbance observer. Compared to the existing approaches, our adaptive scheme is applicable to plants that are unstable, non-minimum phase, and have an arbitrary relative degree and delay. © 2015

关键词： asymptotic stability disturbance rejection time-delay system

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Dynamics of DFIG controlled by Rotor Side Converter in wind energy

Dynamics of DFIG controlled by Rotor Side Converter in wind ...

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International Youth Conference on Energetics (IYCE)

作者： Péter Stumpf József Berei István Nagy István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest MTA-BME Control Engineering Research Group

The paper is concern with the investigation of control of Doubly Fed Induction Generator (DFIG) carried out by Rotor Side Converter (RSC) applied in wind energy harvest. Throughout the paper the principle of Stator Flux Oriented Vector control (SFOVC) is applied. In the first part of the paper a general slip-torque relation is derived with three torque components: one component is derived by the stator voltage, the other one by the d component and the third one by the q component of the rotor voltage space vector. In the second part of the paper, the dynamic behavior of the algorithm controlling the stator active and reactive power is simulated in open loop and closed loop.

关键词： Rotors Torque Stators Turbines Mathematical model Microgrids Transient response

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Filtering and gradient estimation for distance fields by quadratic regression

Periodica polytechnica Electrical engineering and computer s...

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Periodica polytechnica Electrical engineering and computer science 2015年第4期59卷 175-180页

作者： Szirmay-Kalos, László Department of Control Engineering and Information Technology Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics P.O.B. 91 BudapestH-1521 Hungary

Distance fields show up in many problems of 3D vision and rendering, for example, a volumetric fusion of depth images results in such a field. Distance fields obtained from measured values are inherently noisy, so its filtering is needed before isoparametric surfaces are extracted from them, and robust normal vector estimation also requires a local smoothing since differentiation is especially sensitive to noise. In this paper, we use regression to find a quadratic function that approximates the zero level surface of the distance field, and apply this both for filtering and normal vector estimation. We also present a computationally efficient method that exploits the regular structure of samples, the symmetry and separability of the weighting functions, and thus avoids the solution of larger linear equations, which otherwise would become necessary when regression is generally attacked. The algorithm is a part of a real-time volumetric fusion application running on the Graphics Processing Units (GPU).

关键词： Graphics processing unit

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Hybrid Output controller for Biased and Time-Varying Periodic Disturbances Rejection

Hybrid Output Controller for Biased and Time-Varying Periodi...

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作者： Bobtsov, Alexey A. Kolyubin, Sergey A. Pyrkin, Anton A. Nikolaev, Nikolay A. Department of Control Systems and Informatics Saint Petersburg National Research University of Information Technologies Mechanics and Optics Kronverkskiy pr. 49 St. Petersburg197101 Russia Department of Engineering Cybernetics Norwegian University of Science and Technology TrondheimNO-7491 Norway Control of Complex Systems Lab. Institute for Problems of Mechanical Engineering RAS Bolshoy pr. V.O. 61 St.Petersburg199178 Russia

The task of output feedback stabilization of a linear plant of arbitrary relative degree is solved under parametric uncertainty and matching periodic disturbances. Resulting controller was built coupling a high-gain output controller and an external disturbance observer by means of switching algorithm. Extending previously developed approach we suppose disturbance frequency to be not only unknown, but also time-varying, which is the case for a number of applications. Simulation results illustrate performance of the obtained controller for the cases of piece-wise constant and drifting frequency disturbances. © 2015

关键词： Disturbance rejection

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A Bayesian model for system level reliability estimation

A Bayesian model for system level reliability estimation

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IEEE European Test Symposium (ETS)

作者： A. Vallero A. Savino S. Tselonis N. Foutris M. Kaliorakis G. Politano D. Gizopoulos S. Di Carlo Control and Computer Engineering Department Torino Italy Politecnico di Torino Torino Piemonte IT Department of Informatics & Telecommunications University of Athens Athens Greece

Nowadays, the scientific community is looking for ways to understand the effect of software execution on the reliability of a complex system when the hardware layer is unreliable. This paper proposes a statistical reliability analysis model able to estimate system reliability considering both the hardware and the software layer of a system. Bayesian Networks are employed to model hardware resources of the processor and instructions of program traces. They are exploited to investigate the probability of input errors to alter both the correct behavior and the output of the program. Experimental results show that Bayesian networks prove to be a promising model, allowing to get accurate and fast reliability estimations w.r.t. fault injection/simulation approaches.

关键词： Reliability Bayes methods Estimation Computational modeling Hardware Computer network reliability Software

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Adaptive Genetic Pareto Ranking Based on Clustering

Adaptive Genetic Pareto Ranking Based on Clustering

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IEEE International Conference on Evolving and Adaptive Intelligent Systems

作者： Lavinia Ferariu Corina Cimpanu "Gheorghe Asachi" Technical University of Iasi Department of Automatic Control and Applied Informatics "Gheorghe Asachi" Technical University of Iasi Department of Computer Engineering

ISBN: (纸本)9781467366991

The proposed Pareto ranking scheme is meant for the selection of parents and survivors in multi-objective evolutionary optimizations. Commonly, the Pareto methods use just the dominance analysis in order to provide the partial sorting of solutions, without taking into account the specific strength of the conflict detected between objectives. This can generate undesired effects, such as the loss of diversity or the excessive spread of solutions induced by too weakly or too strongly conflicting criteria, respectively. For counteracting these disadvantages, the suggested approach adapts the ranking policies with respect to the distribution of the population in the objective space. The first innovation of the paper resides in the way in which the layout of the available solutions is examined. The analysis is based on clustering, followed by the Pareto-ranking of the resulted centers. The centers belonging to the best fronts are then used to depict the preferred searching area and to decide if the diversity of the solutions requires improvement. In this regard, the second contribution supports the diversification of the preferred solutions via rank adjustments. The suggested ranking algorithm is experimentally verified on several synthetic multi-objective optimizations and a multi-objective robot path planning. The testing scenarios exemplify different layouts of the Pareto fronts for diverse conflictive relationships between the two objectives.

关键词： Multiobjective optimization Genetic algorithms Ranking Clustering Dominance analysis Cluster Analysis Genetic Algorithm (GA) Solutions layouts specific stiffness fronts Oceanic fronts fronts (meteorology)

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