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10th Mediterranean Conference on Embedded Computing, MECO 2021

作者： Bulzakov, Yu. Vitiazeva, T. Mikheev, A. Ryazan State Radio Engineering University RSREU The Department of Automation Informatics and Control System Ryazan Russia

ISBN: (纸本)9780738133614

The issues of estimating the influence of the sampling rate variability on the spectral distribution of complex discrete samples of the isoline drift signal formed on the TP segment of the electrocardiosignal has been examined. Mathematical expressions that relate the spectral components in the zero spectral zone caused by the presence of sampling rate variability and non-zero samples of the isoline drift signal, which allow us to estimate the ratio of these components, have been obtained. © 2021 IEEE.

关键词： Estimation

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DC components and subharmonics generated by naturally sampled PWM techniques

DC components and subharmonics generated by naturally sample...

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38th Annual Conference on IEEE Industrial Electronics Society, IECON 2012

作者： Stumpf, Peter Jardan, Rafael K. Nagy, Istvan Budapest University of Technology and Economics Department of Automation and Applied Informatics Hungary Budapest University of Technology and Economics Department of Mechatronics Optics and Engineering Informatics Budapest Hungary

ISBN: (纸本)9781467324212

One possible implementation form of Pulse Width Modulation is the naturally sampled one (NS-PWM). Its favourable properties are that no distortion or delayed response are introduced by it. The paper compares three different realizations of NS-PWM techniques by simulations and experimental measurements when the carrier over reference frequency ratio mf is small number as in inverters supplying ultrahigh speed induction motor (USIM). The three NS-PWM techniques are the Sinusoidal, Sinusoidal and third-harmonic reference injection and the Space Vector Modulation. The paper verifies both by simulation and laboratory results that the three techniques generate DC voltage component in the output voltage of the inverter contrary to many previous publications. In addition subharmonic currents and fluxes with considerable amplitudes are produced as well due to the small mf and very low subharmonic frequency even though the subharmonic voltage component is very small. © 2012 IEEE.

关键词： Pulse width modulation

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Load Comparison Between Two Controlling Strategies for Wind Energy Conversion System Power-Boosting 16

Load Comparison Between Two Controlling Strategies for Wind ...

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16th IEEE International Symposium on Applied Computational Intelligence and informatics, SACI 2022

作者： Bordeasu, Dorin Prostean, Octavian Vasar, Cristian Debes, Ali Department of Automation and Applied Informatics Timişoara Romania Control Engineering Siemens Gamesa Brande Denmark

ISBN: (数字)9781665481250

ISBN: (纸本)9781665481250

This paper explains in detail the development, validation and simulation of a standard PI controller that can boost the WECS (Wind energy conversion system) power through two strategies. In the first strategy, the power is boosted by increasing the generator angular velocity through the direct increase of the angular velocity of the wind turbine rotor by slightly pitching the blades. In the second strategy, the power is boosted by increasing the load torque of the generator, through the direct increase of the load torque of the wind turbine rotor. For achieving this goal, the following tasks have been accomplished: a wind energy conversion system nonlinear mathematical model has been developed, a gain scheduled proportional-integral (PI) controller as the baseline controller, and two gain scheduled proportional-integral (PI) power-boosting controllers for the two power-boosting strategies. For the power-boosting controllers, it is also presented a logic that switches between baseline and power booster controllers when certain wind speeds conditions are met. The response, stability, performance and the increase in the shaft torsion, tower and blades bending moments of the gain scheduled PI power-boosting controllers have been compared with the baseline controller. By comparing the output power response of the controllers, it can be seen that the power booster controllers boost the power when the defined conditions are met. Finally, for boosting the power of a WECS in certain conditions the most efficient way is by increasing the generator load torque, because this strategy increases the least the loading of the main components of a WECS. This power boosting strategy implementation it might require the change (or reinforcement) of the drive train shaft, if it cannot take the extra loading created by power boosting controller. © 2022 IEEE.

关键词： Controllers

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Modeling and optimized control of photovoltaic energy conversion systems

Modeling and optimized control of photovoltaic energy conver...

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7th IEEE International Symposium on Applied Computational Intelligence and informatics, SACI 2012

作者： Gana, O. Prostean, O. Vasar, C. Babescu, M. Politehnica University of Timisoara Department of Electrical Engineering Romania Politehnica University of Timisoara Department of Automation and Applied Informatics Romania

ISBN: (纸本)9781467310116

The present paper presents specific issues that arise in Photovoltaic Energy Conversion Systems, being focused on maximizing the output power. There is proposed a model for Photovoltaic PV panel external characteristics. The coordinates of maximum power point are determined and used for imposing the appropriate load resistance to maximize the provided power. A comparison is made considering the classical control methods and the proposed optimized method, that prove better performances than methods based on output power measurement. ©2012 IEEE.

关键词： Solar panels

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The control of the diesel-synchronous generator electro-energetic system

The control of the diesel-synchronous generator electro-ener...

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IEEE International Joint Conferences on Computational Cybernetics and Technical informatics, ICCC-CONTI 2010

作者： Babescu, M. Boraci, R. Gana, O. Koch-Ciobotaru, C. Politehnica University Department of Electrical Engineering Timisoara Romania Politehnica University Department of Automation and Applied Informatics Timisoara Romania

ISBN: (纸本)9781424474332

The Diesel engine - synchronous generator system (DE-SG) is widely used in applications where the power distribution grid is absent. This system can ensure, in certain constructive and control (regulation) conditions, the electric energy at nominal values (U = 400 V, f = 50 Hz). This paper shows that is necessary for the SG to have the excitation in direct current, and so, to control the excitation current. It also shows that is necessary to control the fuel flow to the DE, in order for the mechanical power injected into the system to cover the power needed by the electric consumers. Finally, using results from this paper, it is possible to resolve, in the second part, the highly complex problem of regulator adjustment, especially because of the differential equations which model the system are nonlinear and non homogenous © 2010 IEEE.

关键词： Synchronous generators

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Trajectory-Tracking Sliding-Mode Control of the Autonomous Wheelchair Modeled as a Nonholonomic WMR 14

Trajectory-Tracking Sliding-Mode Control of the Autonomous W...

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14th IEEE International Conference on Control and automation, ICCA 2018

作者： Filipescu, A. Solea, R. Filipescu, A. Stamatescu, G. Ciubucciu, G. Department of Automation and Electrical Engineering 'Dunarea de Jos' University of Galati Domneasca47 Romania Department of Automation and Electrical Engineering 'Dunarea de Jos' University of Galati Romania Department of Automation and Industrial Informatics Polytechnic University of Bucharest Romania

ISBN: (纸本)9781538660898

This paper deals a new approach of the trajectory-tracking second-order sliding-mode control (TT-SOSMC), applied to control a nonholonomic wheelchair for elderly and disabled based on kinematic model. Cirrus Power Wheelchair (CPW) was modelled like a wheeled mobile robot (WMR) with two driving and two free wheels (2DW/2FW). A hardware description, concerning driving wheels control, data acquisition and communication with PC and touch screen, is presented. Simulations and real time results have presented taking into account parameter uncertainties and external disturbances. CPW closed loop control, via simulation and real-time have proved improved performance in terms of decreasing reaching and settling times with increasing robustness. © 2018 IEEE.

关键词： Sliding mode control

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An efficient FPGA implementation of the big bang-big crunch optimization algorithm 14th

An efficient FPGA implementation of the big bang-big crunch ...

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14th International Symposium on Applied Reconfigurable Computing, ARC 2018

作者： Abdoalnasir, Almabrok Psarakis, Mihalis Dounis, Anastasios Department of Informatics University of Piraeus Piraeus Greece Department of Automation Engineering Piraeus University of Applied Sciences Aigaleo Greece

ISBN: (纸本)9783319788890

Big Bang-Big Crunch (BB-BC) is an optimization method inspired by the corresponding evolutionary theory of the universe [1]. The BB-BC method is performed in two phases: in the Bing Bang phase, similarly to other Genetic Algorithms (GAs) it generates a random population of candidate solutions, while in the Big Crunch phase it shrinks these candidates around an optimal point via a center-of-mass or minimal cost approach. It has been shown that the BB-BC method outperforms classical GA algorithms for several optimization problems in terms of convergence speed. In this paper, we study the FPGA implementation of the BB-BC algorithm. We show that the BB-BC algorithm does not suffer from the design limitations of the classical GAs that impede the performance of their hardware-based accelerators. We propose an efficient fully pipelined design of both BB-BC phases that achieves significant speedup compared to the software counterpart. We also present a parallel scheme which integrates several BB-BC pipelined engines to improve system performance. The proposed FPGA architecture has been demonstrated for a typical optimization problem and implemented on a Xilinx Virtex-5 device. © Springer International Publishing AG, part of Springer Nature 2018.

关键词： Genetic algorithms

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A deep learning-based BWIM system of a cable-stayed bridge 12th

A deep learning-based BWIM system of a cable-stayed bridge

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12th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2024

作者： Szinyéri, B. Kovari, B. Völgyi, I. Kollár, D. Joó, A.L. Faculty of Electrical Engineering and Informatics Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Faculty of Civil Engineering Department of Structural Engineering Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9781032770406

Multiple breakthroughs have emerged across various applications due to deep learning. These advancements can also be adapted for Bridge Weigh-In-Motion (BWIM) systems. A deep learning-based algorithm has been developed previously by the authors, which can be integrated into these systems. That algorithm shows promising results when compared to so-called static methods. One of the main contributions of our developments is handling the error of the preprocessing steps more efficiently. A developed axle load estimator is presented in this paper that builds on our previous solution, and which was tested in operation on a cable-stayed bridge. The algorithm handles multi-lane scenarios more efficiently when compared to our previous solution. The comparison of this novel algorithm and Moses’ algorithm is also presented in this paper. Our solution achieves lower error rates both on a synthetic dataset, and a real measurement-based annotated dataset. © 2024 The Author(s).

关键词： Cable stayed bridges

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On functioning of the electric wind system at its maximum power

On functioning of the electric wind system at its maximum po...

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IEEE International Joint Conferences on Computational Cybernetics and Technical informatics, ICCC-CONTI 2010

作者： Babescu, M. Boraci, R. Chioreanu, C.H. Koch-Ciobotaru, C. Gana, O. Politehnica University Department of Electrical Engineering Timisoara Romania Politehnica University Department of Automation and Applied Informatics Timisoara Romania

ISBN: (纸本)9781424474332

The paper aims to demonstrate that an wind system (wind turbine - WT + synchronous generator-SG), (WT + SG) cannot actually work at its maximum power points because of the rapid variation of the wind speed value and of the increased value of the inertia moments. The considered system (WT+SG) was mathematically modelled based upon the mathematical models of WT and SG, and the analysis focuses its bearing within the rapid and important variations of the wind speed value. Non-linear and inhomogeneous differential equations are numerical solved and the simulations are acquired in different situations for the variation of the wind speed. © 2010 IEEE.

关键词： Differential equations

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Simulation-assisted teaching of graduate students in transport: A case study of the application of acausal freeware *** to solution of Sakawa's open-loop optimal control problem for payload motion during crane boom rotation

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International Journal of Mechanical engineering Education 2017年第1期45卷 3-27页

作者： Kostikov, Alexander A. Perig, Alexander V. Lozun, Ruslan R. Informatics and Engineering Graphics Department Donbass State Engineering Academy Donetsk Region Ukraine Manufacturing Processes and Automation Engineering Department Donbass State Engineering Academy Shkadinova 72 Kramatorsk Donetsk Region84313 Ukraine Computer and Information Technology Department Donbass State Engineering Academy Donetsk Region Ukraine

The present article is focused on the improvement of the quality of engineering education of graduate students with a major in transport and mechanical engineering through the derivation of a numerical solution of the optimal control problem for payload swaying during crane boom slewing, formulated by Sakawa et al. For the first time, a numerical solution of Sakawa's problem has been derived with an application of *** freeware. The fundamental difference between this solution and Sakawa's is the imposition of a restrictive constraint on the allowable value of payload swaying during boom-driven payload motion. The solution derived by the authors for Sakawa's problem takes exact account of the restrictive constraints on the phase variables in contrast to Sakawa's model, where the restriction constraints on the phase variables have been approximated. The complex of authors-proposed computational algorithms was implemented with ***. The proposed open-code algorithms derive numerical data and computational plots, which enhance and expand students' knowledge about the dynamics of guided boom-driven payload swaying during rotary crane boom slewing. © SAGE Publications.

关键词： engineering education

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