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19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014

作者： Estrada-Manzo, Víctor Lendek, Zsófia Guerra, Thierry Marie University of Valenciennes and Hainaut-Cambrésis LAMIH UMR CNRS 8201 Le Mont Houy Valenciennes cedex 959313 France Department of Automotion Technical University of Cluj-Napoca Memorandumului 28 Cluj-Napoca400114 Romania

ISBN: (纸本)9783902823625

The present paper deals with observer design for discrete-time nonlinear descriptor systems. Through Finsler's Lemma, we cut the link between the observer gains and the Lyapunov function, which relaxes existing conditions and introduces an extra degree of freedom. In addition, the results are expressed as LMI constraints. The effectiveness of the two proposed approaches is illustrated via several examples. © IFAC.

关键词： Degrees of freedom (mechanics)

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Optimizing the casting length of single diameter steel billets based on minimum cost

Optimizing the casting length of single diameter steel bille...

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

作者： Iulia Clitan Mihail Abrudean Vlad Muresan Diana Sas Department of Automation Technical University of Cluj-Napoca Cluj Napoca Romania

ISBN: (纸本)9781509027217

The hot rolling process uses, as raw material, round bars casted using continuous casting at the steel making plant. From here a limited number of casted billets, in terms of length, can be delivered. The supply order for the rolling process is unpredictable and imprecise, thus in this scenario the current paper intends to offer a solution to the industrial partner as to optimize the casting lengths of billets, considering the restrictions of the casting process, and to achieve minimum production cost. An order is converted into a number of billets that should be casted at an ideal length. Two different methods are proposed, an analytical one, designed by the authors, and the linear programming method, in order to generate an optimal solution to the stated problem based on minimizing a cost function. The analytical method's result is the optimal number of steel blocks that need to be casted at a single length, from the limited set. The linear programming method's result is the optimal number of blocks that need to be casted from each available length. The results obtained from both methods are compared based on a set of casting orders via successive simulations.

关键词： Casting Billets Steel Linear programming Mathematical model

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dspace platforms for interfacing mechatronic drive systems

Romanian Review Precision Mechanics, Optics and Mechatronics

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Romanian Review Precision mechanics, Optics and Mechatronics 2011年第39期 55-58页

作者： Cosma, Ioan Adrian MǍties, Vistrian Mîndru, Rares Ciprian Technical University of Cluj-Napoca Mechanisms Precision Mechanics and Mechatronics Department Romania

The aim of the paper is to present details regarding interfacing and testing mechatronic drive systems based on different energy sources, using dSpace hardware. The considered platforms are represented by fluidic, shape memory alloy and electroactive polymer actuators based systems. There are studied and pointed out details regarding information flow within the proposed drive systems. The last part of the paper focuses on testing of such mechatronic drive systems, where the shape memory alloy and electroactive polymer based drive systems are considered. The presented approaches are useful components for proper integral education based on mechatronic platforms.

关键词： Conducting polymers

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Smart home automation system using Wi-Fi low power devices

Smart home automation system using Wi-Fi low power devices

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： Silviu Folea Daniela Bordencea Casiana Hotea Honoriu Valean Automation Department Technical University of Cluj Napoca Cluj-Napoca Romania

Home automation is gaining popularity nowadays. A smart home automation system is based on ensuring security and making user life easier. It contains a large number of sensors which can control or monitor objects distributed in three-dimensional space. The sensors can be specialized in measuring temperature, humidity, pressure, light, noise, dust air, and so on. In this paper, a solution to transform a normal house in a smart house while reducing the energy consumption is proposed. This can be realized with the help of wireless sensor networks and of the LabVIEW™ graphical programming environment, which use the NI LabVIEW™ Statechart Module for collecting data from sensors.

关键词： Temperature sensors Temperature control Temperature measurement Home automation Security Magnetic sensors

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Exploiting parallel processing and optimal paths in a flexible manufacturing system

Exploiting parallel processing and optimal paths in a flexib...

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： S. Herle S. Man Gh. Lazea C. Marcu R. Robotin Department of Automation Technical University of Cluj Napoca Cluj-Napoca Romania

Rapid changes on the goods market take place today. These changes require an increased flexibility of the production systems in order to quickly adapt the manufacturing system to a new model of product. However, increasing the flexibility usually also increases the complexity of the system, and therefore the costs per part produced. The challenge is to develop control strategies capable to increase the productivity of a production system, while maintaining the associated costs as low as possible. We propose a control strategy capable of responding to this challenge. Using multitasking programming and optimization of the materials' travel between different points of the flexible manufacturing system, we implement a controller capable to reduce the lead time by up to 26.3%, which leads to an increase of the system's productivity by up to 34%. The control strategy proposed will increase the productivity; moreover no interventions on the hardware systems are required. The strategy also reduces the manufacturing cost per part since the productivity increases.

关键词： Parallel processing Flexible manufacturing systems Productivity Costs Control systems Production systems Manufacturing systems Multitasking Lead time reduction Hardware

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Optimum geometry for planar structures regarding their loss factor

Optimum geometry for planar structures regarding their loss ...

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International Conference and Exposition on Electrical and Power Engineering (EPE)

作者： Claudia Hebedean Calin Munteanu Adina Racasan Claudia Pacurar Electrical and Measurements Department Technical University of Cluj Napoca Cluj-Napoca Romania

Planar structures are often used recently due to their many advantages. Transformers, power inductors and EMI filters are only a few components that are constructed using this technique. In order to increase their efficiency, parasitic capacitance (EPC) and equivalent series inductance (ESL) must be decreased and HF losses must be appropriate to their utilization. This paper represents a study which aims at finding how the shifting of the windings influences HF losses and also determining the optimum geometry for increasing the losses in planar structures.

关键词： Geometry Conductors Mobile communication Linear programming Windings Hafnium Electromagnetic interference

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Training in coordinate measurement using 3D virtual instruments

Training in coordinate measurement using 3D virtual instrume...

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作者： Neamţu, CǍlin Hurgoiu, Dan Popescu, Sorin Dragomir, Mihai Osanna, Herbert Technical University of Cluj-Napoca Department of Design Engineering and Robotics Bd. Muncii 103-105 400641 Cluj-Napoca Romania Vienna University of Technology Department for Interchangeable Manufacturing and Industrial Metrology Karlsplatz 13/3113 A-1040 Vienna Austria

Coordinate metrology is a subject that has evolved driven by two important vectors: hardware and software development. At present, most 3D measuring software offer features for offline programming of the Coordinate Measuring Machines (CMM). A few software solutions enable the simulation of both the CMM and other elements involved in the measuring process, such as the human operator or an automated system for loading and unloading the measured parts. The paper presents the features and advantages offered by Delmia V5 for simulating a complete measuring environment encompassing: the CMM, the human operator, a robot or automated system for manipulating the parts. The simulations developed represent a powerful learning tool that can complement existing models for CMM training. © 2011 Elsevier Ltd. All rights reserved.

关键词： Coordinate measuring machines

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Optimal scheduling of an islanded microgrid based on minimum cost

Optimal scheduling of an islanded microgrid based on minimum...

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International Spring Seminar on Electronics Technology

作者： Enikő Lázár Dorin Petreuş Radu Etz Toma Pătărău Department of Applied Electronics Technical University of Cluj-Napoca Cluj-Napoca Romania

In this paper, the optimal operation of a photovoltaic unit, a geothermal generator, a biomass generator and a storage system is determined by a mixed-integer linear programming algorithm. Modeling, control and optimal operation of intelligent smart islanded microgrids with renewable energy resources (RES) have gotten high attention in the past years. Optimal operation scheduling of the generators and the batteries is a crucial issue in these systems. Starting and stopping the generation units at the right time can maximize the system's performance, minimize the operation cost and ensure a more reliable power balance for the microgrid. A PC software was developed to determine these start- and stop-moments for each generator and the charge of batteries. This Supervisory Control and Data Acquisition (SCADA) system can ensure the optimal scheduling of the generation units and guarantees correct functioning of the equipment, focusing on the operation cost, the generation and control measurements. The results are presented in a GUI (Graphical User Interface).

关键词： Batteries Generators Optimal scheduling Microgrids Photovoltaic systems Biomass

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Evolutionary method for railway monitoring systems

Evolutionary method for railway monitoring systems

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

作者： G. I. Daian M. M. Santa T. S. Letia Department of Automation Technical University of Cluj-Napoca (UTCN) Cluj-Napoca Romania

The paper presents an evolutionary method based on genetic programming (GP) for synthesizing of a monitor alarm system for the railway control traffic unit. Automatic supervision of railway traffic control is a very important and complex task. A wrong control signal can lead to very serious incidents or accidents. A well-designed monitoring system can prevent these accidents by a simple alarm which signals the appearance of a wrong control signal. The railway network or the plant is modeled by Delay Time Petri Nets (DTPN) and the railway traffic control unit by Time Petri Nets (TPN). The alarm monitor contains transitions joined to the plant and control unit in order to achieve the information on the positions of trains, respectively the control signals of the control unit, and generates an alarm whenever the control signal can cause to an incident or accident. The TPN model of the monitor system is generated by means of the genetic programming method using a Lisp representation of the solution.

关键词： Monitoring Rail transportation Accidents Delays Switches Genetics

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An electronically programmable current balancing instrumentation amplifier for biomedical monitoring

An electronically programmable current balancing instrumenta...

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International Conference on Telecommunications and Signal Processing (TSP)

作者： Paul Faragó Mihaela Cîrlugea Sorin Hintea Bases of Electronics Department Technical University of Cluj-Napoca Cluj-Napoca Romania

Instrumentation amplifiers (IA) used in wearable biomedical monitoring systems have to satisfy several performance requirements, such as low-voltage supply and low-power consumption, enabling increased portability. In the same time, a very important feature is wide range parameter programmability. This paper proposes a solution to implement electronic gain programming into an IA. The proposed solution is developed around the current balancing concept. An electronically tunable transconductance amplifier is used for adjusting the IA voltage gain as a function of the transconductor bias currents. Additionally, the proposed IA outputs a differential signal, useful for latter differential analog signal processing. Simulation results validate the proposed IA.

关键词： Transconductance Gain Electrocardiography Transistors programming Instruments Monitoring

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