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共 168 条记录，以下是11-20 订阅

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Drum-boiler control system employing shrink and swell effect remission in thermal power plants

Drum-boiler control system employing shrink and swell effect...

引用

2011 3rd International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, ICUMT 2011

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

ISBN: (纸本)9781457706820

This paper develops a control system for a drum-boiler unit, which employs a three element cascade control (water level, steam flow, feed-water) versus a single element control for the water level loop, in order to attenuate the non-minimum phase shrink-and-swell effect. The overall control structure includes a heat flux control loop for throttle pressure stabilization. Gain scheduling technique is added to improve system responses at various operating points. The process is built around the Åström-Bell non-linear complex drum-boiler model fitted for a real 16 MW thermal power plant. The model is extended with actuators, super-heater and turbine dynamics. The implementation is carried out in Labview, employing a graphical user interface (GUI) for friendly man machine interaction with selection of manual/automatic mode. The simulation results are focused on manual/automatic control operation with satisfactory response behaviors. © 2011 HTE.

关键词： Thermoelectric power plants

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Cascade control for telerobotic systems serving space medicine

Cascade control for telerobotic systems serving space medici...

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作者： Haidegger, Tamás Kovács, Levente Precup, Radu-Emil Preitl, Stefan Benyó, Balázs Benyó, Zoltán Hungary Politehnica University of Timisoara Dept. of Automation and Applied Informatics Romania

ISBN: (纸本)9783902661937

Long distance teleoperation formulates a current control problem task yet to be solved, primarily due to the difficulty to compensate for signal latency. Predictive and modelbased control can only give satisfying results if proper description of the system's behavior is provided. The interdisciplinary field of telesurgery has become a focal point of technologyextended medicine, where master-slave type control over large distances poses significant challenges. Innovative solutions are required to deal with the modeling human teleoperation and varying communication quality parameters. In this paper, we investigate the feasibility a more straight-forward, classical control solution based on Kessler's Extended Symmetrical Method, formulated in a cascade control approach to tackle the problems caused by latency and uncertainties in a modeled telesurgical robot system. © 2011 IFAC.

关键词： Time delay

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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...

引用

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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A distributed system architecture for audio signal processing

A distributed system architecture for audio signal processin...

引用

6th IEEE International Symposium on applied Computational Intelligence and informatics, SACI 2011

作者： Paul, Adrian Sebastian Barbulescu, Daniela Dragan, Florin Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania

ISBN: (纸本)9781424491094

This paper proposes a platform that allows the users to transparently interconnect instances of the software audio signal processing engine without the need of a custom implemented data transport hardware. The platform is focused on distributing the signal processing across different computers in order to increase the overall quality of the signal processing and/or to ensure a more convenient sound reproduction distribution. The design aims to the use of this platform for software audio signal processing in cost-effective audiophile loudspeaker systems or for professional use in stage audio reproduction distribution and management, taking full advantage of the new personal computer hardware products. © 2011 IEEE.

关键词： Cost effectiveness

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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 ...

引用

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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Manufacturing service bus integration model for implementing highly flexible and scalable manufacturing systems

Manufacturing service bus integration model for implementing...

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14th IFAC Symposium on Information Control Problems in Manufacturing, INCOM'12

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor Raileanu, Silviu University Politehnica of Bucharest Dept. of Automation and Applied Informatics Bucharest 060042 Romania

ISBN: (纸本)9783902661982

This paper presents an integration model for designing manufacturing systems using the concept of manufacturing service bus. The manufacturing service bus (MSB) provides a uniform communication framework at the shop floor layer, integrating all components involved. The main characteristics of the MSB integration layer together with the advantages and requirements of the software products used in this model are discussed. The overall architectural goal of this integration model is to assure a very low coupling between the modules at the shop floor level, providing a high degree of flexibility for the manufacturing enterprises. Physical resources as production line robots, conveyors and existing transportation paths, scheduling algorithms can be plugged in and out without or with a very low impact on the entire system functionality. Another important aspect of this design is that it provides elasticity through a dynamic queued communication model, allowing a seamless scaling capability at the shop floor level. © 2012 IFAC.

关键词： Flexible manufacturing systems

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Advanced shop-floor scheduling with genetic algorithm for combined horizon optimization in holonic manufacturing systems

Advanced shop-floor scheduling with genetic algorithm for co...

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6th International Conference on Industrial Applications of Holonic and Multi-Agent Systems, HoloMAS 2013

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor University Politehnica of Bucharest Dept. of Automation and Applied Informatics Bucharest 060042 Romania

ISBN: (纸本)9783642400896

Shop-floor scheduling is one of the most complex problems in holonic manufacturing systems as it deals with unpredictable scenarios and overlapping requirements. The scheduling problem is considered to be a NP-hard problem and only near optimal solutions can be obtained. A solution for this problem can be formulated only by employing meta-heuristic class algorithm. This paper discusses the scheduling problem in heterachical operating mode, focusing on solving the local horizon problem. A distributed genetic algorithm is introduced, that uses the local operation plan to generate the initial solution population. The initial population is then evolved based on global optimum soft conditions until the acceptable solution fitness is achieved. The soft conditions considered at global horizon layer are energy footprint, resource utilization and supply chain optimization for resource stocks. The paper describes the data structures used to model this logic and describes in detail the genetic algorithm evolution mechanism. Experimental results are discussed in the context of a pilot production line consisting of six universal resources and a conveyor belt processing two parallel customer orders. © 2013 Springer-Verlag.

关键词： Scheduling

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Comparison study of PID controller tuning for greenhouse climate with feedback-feedforward linearization and decoupling

Comparison study of PID controller tuning for greenhouse cli...

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2012 16th International Conference on System Theory, Control and Computing, ICSTCC 2012

作者： Gurban, Eugen Horatiu Andreescu, Gheorghe-Daniel Politehnica University of Timisoara Automation and Applied Informatics Dept. Timisoara 300223 Romania

ISBN: (纸本)9786068348483

The interest in ensuring optimal growth climate conditions is sustained by the increasing demand in greenhouse products, which in turn, leads to an increasing demand of high efficiency greenhouse control systems. The greenhouse climate control is complex due to the high nonlinear interaction between the biological subsystem and the physical subsystem, and due to strong coupling of the two main controlled variables: temperature and humidity. In this context, the paper presents an equivalent greenhouse climate model based on feedback-feedforward compensation technique responsible for linearization, decoupling and disturbance compensation of the greenhouse complex model. Based on this equivalent model reduced to integral plus dead time decoupled processes, a comparison study of associated PI/PID controllers employing different tuning techniques is performed by simulation. © 2012 Dunarea de Jos University.

关键词： Climate models

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Management of changes in a holonic manufacturing system with dual-horizon dynamic rescheduling of production orders

Management of changes in a holonic manufacturing system with...

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作者： Borangiu, Theodor Raileanu, Silviu Rosu, Andrei Parlea, Mihai Anton, Florin D. University Politehnica of Bucharest Dept. of Automation and Applied Informatics Bucharest RO 060032 Romania

ISBN: (纸本)9783902661432

The paper describes a solution and implementing framework for the management of changes which may occur in a holonic manufacturing system. This solution is part of the semi-heterarchical control architecture developed for agile job shop assembly with intelligent robots-vision workstations. Two categories of changes in the manufacturing system are considered: (i) changes occurring in resource status at process level: resource breakdown, failure of (vision-based) in-line inspection operation, and depletion of local robot storages;(ii) changes in production orders at business (ERP) level: rush orders. All these situations trigger production plan update and rescheduling (redefine the list of Order Holons) by pipelining CNP-type resource bidding at shop-floor horizon with global product scheduling at aggregate batch horizon. Failure- and recovery management are developed as generic scenarios embedding the CNP mechanism into production self-rescheduling. Implementing solutions and experimental results are reported for a 6-station robot-vision assembly cell with twin-track closed-loop pallet transportation system and product tracking RD/WR devices. Future developments will consider manufacturing integration at enterprise level. © 2009 IFAC.

关键词： Production control

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Control of Wind Turbines Operating at Significantly Variable Wind Speeds Over Time 4

Control of Wind Turbines Operating at Significantly Variable...

引用

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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