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4th IEEE International Conference on Electrical, Computer, and Energy Technologies, ICECET 2024

作者： Edu, Emil-Ronald Radac, Mircea-Bogdan Department of Mechanical Engineering Timisoara Romania PUT Dept. of Automation and Applied Informatics Timisoara Romania

ISBN: (纸本)9798350395914

In the present paper, the operation of high-power wind turbines of the order of mega-watts (MW), is analysed at significantly variable wind speeds over time. Experimental data from a wind turbine operating in the Dobrogea region are processed, at a higher sampling frequency of measurements. The current operating condition is investigated from an efficiency viewpoint and compared with an optimized controlled setting, in which the electric generator power is controlled dependent on the wind speed value. We find that wind speed sampling frequency is an important factor impacting control quality, while the improved control is mandatory for maximal operation efficiency. © 2024 IEEE.

关键词： Windmill

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Two Discrete-Time Data-Driven Sliding Mode Controllers for Tower Crane Systems 27

Two Discrete-Time Data-Driven Sliding Mode Controllers for T...

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27th International Conference on System Theory, Control and Computing, ICSTCC 2023

作者： Borlea, Anamaria-Ioana Precup, Radu-Emil Roman, Raul-Cristian Dept. Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania Dept. Automation and Applied Informatics Politehnica University of Timisoara Center Fundam. Adv. Tech. Res. Romanian Academy - Timisoara Branch Timisoara Romania

ISBN: (纸本)9798350337983

This paper merges the advantages of data-driven control and sliding mode control in terms of applying and modifying two combinations of model-free adaptive control and sliding mode control suggested by Ebrahimi et al. in 2018 to the position control of tower crane systems. The modifications concern the classical definition of the control error or the tracking error and appropriate proofs are adapted and summarized. The two controllers are validated experimentally and compared in the control of the three positions specific to tower crane system laboratory equipment. © 2023 IEEE.

关键词： Sliding mode control

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Two-Wheeled Inverted-Pendulum Self-Balancing Robot with LQR or PID Control 10

Two-Wheeled Inverted-Pendulum Self-Balancing Robot with LQR ...

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10th IEEE Jubilee International Conference on Computational Cybernetics and Cyber-Medical Systems, ICCC 2022

作者： Petcu, Razvan Andreescu, Gheorghe-Daniel Politehnica University Timisoara Dept. of Automation and Applied Informatics Timisoara Romania

ISBN: (数字)9781665481779

ISBN: (纸本)9781665481779

The two-wheeled inverted pendulum (WIP) is an unstable nonlinear system used in industrial and academic applications. Two control methods for WIP-based self-balancing robot are developed, implemented in Matlab-Simulink and tested by simulation with good results. These methods are: i) LQR control with state observer to stabilize the pendulum vertical-angle and to track a desired motion trajectory, and ii) PID control for vertical-angle stabilization. An experimental prototype of WIP self-balancing robot with only the PID vertical-angle control is designed, implemented, and experimental tested on surfaces with different friction coefficients, proving good vertical-angle stabilization. © 2022 IEEE.

关键词： Inverted pendulum

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Sensorless Control of PMSM Based on Active Flux Observer and MRAS Stator Resistance Identification 16

Sensorless Control of PMSM Based on Active Flux Observer and...

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

作者： Andreescu, Gheorghe-Daniel Petcu, Razvan Politehnica University Timisoara Dept. of Automation and Applied Informatics Timisoara Romania

ISBN: (数字)9781665481250

ISBN: (纸本)9781665481250

This paper introduces a robust sensorless control system for permanent magnet synchronous motor (PMSM) drives using the active flux observer with serial combined PMSM voltage and current models. To assure system robustness, the stator resistance identification is proposed using a MRAS with the stator current angle error in adaptation mechanism. The extensive simulation results prove the effectiveness of the proposed sensorless control system with very good steady state and dynamic performance in large speed range 1:50, with minimum speed of 20 rpm (2% rated speed) and 1°max rotor position error, for step speed and rated torque references, step speed reversal at lower speed, and linear variation of stator resistance. © 2022 IEEE.

关键词： Sensorless control

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ADDRESSING CHALLENGES IN MODELING REAL-TIME APPLICATIONS FOR COMPLEX DISTRIBUTED SYSTEMS

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

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UPB Scientific Bulletin, Series C: Electrical Engineering and Computer Science 2023年第4期85卷 181-192页

作者： Dobrica, Liliana Dept. of Automation and Applied Informatics UNST POLITEHNICA of Bucharest Romania

The paper explores the current challenges in software modeling of real-time applications for complex distributed systems taking benefits of the current abstracted mechanisms and graphical elements supported by UML and its MARTE profile. The main concerns are focused on modeling the structure and behavior of a set of various types of tasks that are executed concurrently, modeling asynchronous events including a more detailed representation of the hardware interrupts mechanism, modeling timing constraints in structural diagrams, scheduling policies, concurrency on shared resources and intertask communication mechanisms. A model-driven development approach based on open-source tools integrated in Eclipse platform is used to address the modeling challenges. © 2023, Politechnica University of Bucharest. All rights reserved.

关键词： Software design

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Control of Wind Turbines Operating at Significantly Variable Wind Speeds Over Time

Control of Wind Turbines Operating at Significantly Variable...

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Electrical, Computer and Energy Technologies (ICECET), International Conference on

作者： Emil-Ronald Edu Mircea-Bogdan Radac Department of Mechanical Engineering Politehnica University of Timisoara (PUT) Timisoara Romania Dept. of Automation and Applied Informatics PUT Timisoara Romania

ISBN: (数字)9798350395914

ISBN: (纸本)9798350395921

关键词： Wind energy Wind speed Current measurement Electric generators Wind turbines Frequency measurement Frequency control

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Two Discrete-Time Data-Driven Sliding Mode Controllers for Tower Crane Systems

Two Discrete-Time Data-Driven Sliding Mode Controllers for T...

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International Conference on System Theory, Control, and Computing (ICSTCC)

作者： Anamaria-Ioana Borlea Radu-Emil Precup Raul-Cristian Roman Dept. Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania Dept. Automation and Applied Informatics Center Fundam. Adv. Tech. Res. Romanian Academy - Timisoara Branch Politehnica University of Timisoara Timisoara Romania

关键词：

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Intelligent Proportional Controller Tuned by Virtual Reference Feedback Tuning and Fictitious Reference Iterative Tuning 10

Intelligent Proportional Controller Tuned by Virtual Referen...

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10th International Conference on Information Technology and Quantitative Management, ITQM 2023

作者： Roman, Raul-Cristian Precup, Radu-Emil Hedrea, Elena-Lorena Politehnica University of Timisoara Dept. Automation and Applied Informatics Bd. V. Parvan 2 Timisoara300223 Romania Center for Fundamental and Advanced Technical Research Romanian Academy Timisoara Branch Bd. Mihai Viteazu 24 Timisoara300223 Romania

A comparative study of two mixes of data-driven algorithms is proposed in this paper. The discrete-time second-order model-free control known as an intelligent Proportional (iP) controller is tuned considering Virtual Reference Feedback Tuning (VRFT) and the overall performance of the resulting algorithm iP-VRFT is compared with that of iP controller that is tuned considering Fictitious Reference Feedback Tuning (FRIT), an algorithm that is further referred as iP-FRIT. The comparison is carried out as far as the control systems with these two control algorithms are concerned. The purpose of the comparison study is to determine if VRFT and FRIT optimally determine the iP parameters such that both control system structures perform in the same manner. Both algorithm mixes are experimentally validated on the Tower Crane System equipment. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Tenth International Conference on Information Technology and Quantitative Management.

关键词： Iterative methods

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Open source machine vision platform for manufacturing and robotics

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IFAC-PapersOnLine 2021年第1期54卷 522-527页

作者： Silviu Răileanu Theodor Borangiu Florin Anton Silvia Anton University Politehnica of Bucharest Dept. of Automation and Applied Informatics Bucharest Romania

The paper describes the design and implementation of an open source machine vision platform for visual robot guidance and automated product inspection in manufacturing, based on OpenCV library. Using this platform, the rigid, industry-specific organization of material flows can be relaxed, shop floor resources becoming reality-aware. The main functionalities are: acquisition of video streams from multiple sources, image analysis at scene level, part recognition, locating and interaction with industrial equipment using standard, open communication protocols. The paper describes design aspects: system architecture, data acquisition and standardization of the image representation used by the analysis algorithms and object recognition module and input/output interaction protocols for a set of predefined cases. Results are reported for an implementation of the platform using a commercial image acquisition device and an industrial robot.

关键词： machine vision interaction protocol industrial robot visual robot guidance extended visual environment open source OpenCV TCP

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Improvement of K-means Cluster Quality by Post Processing Resulted Clusters

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Procedia Computer Science 2022年 199卷 63-70页

作者： Ioan-Daniel Borlea Radu-Emil Precup Alexandra-Bianca Borlea Politehnica University of Timişoara Dept. Automation and Applied Informatics Bd. V. Parvan 2 300223 Timişoara Romania

A big volume of new data is generated in every moment of the day by different devices and domains as social network, mobile and desktop devices, financial transaction, online websites, different search engines and a lot of smart home devices. The generated data is diversified and can be structured or unstructured. Clustering is the process of categorizing a dataset in groups of records that are similar and are called clusters, the grouping process being performed using a specific criterion. The K-means clustering algorithm is still popular after many years. Different versions of the K-means algorithm emerged along the time and were focused on improving the K-means algorithm by performing some preprocessing steps or by reducing the number of iterations having as a final objective the improvement of the processing time. This paper presents a way of improving the resulted clusters generated by the K-means algorithm by post processing the resulted clusters with a supervised learning algorithm. The proposed approach is focused on improving the quality of the resulting clusters and not on reducing the processing time.

关键词： Clustering algorithms hybrid K-means improved K-means K-means post processing

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