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International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

作者： Paulo Fernandes da Silva Raimundo Carlos Silvério Freire Alexandre Jean René Serres Paulo Henrique Da Fonseca Silva Jefferson Costa e Silva Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Brazil Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Campina Grande Brazil Universidade Federal de Campina Grande Campina Grande PB BR Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB Brazil Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB Joao Pessoa Brazil

In this paper is presented a new printed monopole antenna, bio-inspired by jasmine flower, that meets the Federal Communications Commission parameters for ultra-wideband systems. The design of the printed monopole antenna in jasmine flower has developed from a printed monopole antenna with circular geometry, with comparison results. The measured results of bio-inspired antenna in the jasmine flower showed compatibility with the parameters required by the FCC for ultra-wideband technology. It obtained bandwidth of 9.75 GHz, half-power beamwidth of 148 degrees, omnidirectional radiation pattern, gain of 5.99 dBi, power spectral density below -41.3 dBm across the bandwidth of ultra-wideband technology, small pulse distortion, and constant group delay, with variations of less than 2ns.

关键词： FCC Ultra wideband antennas Antenna measurements Bandwidth Geometry Distortion Frequency measurement

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An assessment of rolled stainless steel angles under compression 7th

An assessment of rolled stainless steel angles under compres...

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7th International Conference on Structural engineering, Mechanics and Computation, 2019

作者： da Sirqueira, A.S. da Vellasco, P.C.G.S. de Lima, L.R.O. da Silva, A.T. Rodrigues, M.C. Vellasco, M.M.B.R. PGECIV-Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Electrical Engineering Department PUC-Rio – Pontifical Catholic University of Rio de Janeiro Brazil

ISBN: (纸本)9781138386969

Stainless steel has been used in several types of constructions. Although many of their mechanical properties are similar to the properties of carbon steel, their nonlinear characteristics imply in different design rules. This non-linearity mainly affects the response to local and flexural buckling. The Eurocode 3: Part 1-4 (2006) stainless steel design standard can be applied to hot rolled, welded and cold formed products, but the provisions of this code are rather conservative, with a limited application due to the lack of experimental data. Thus, one of those areas that require attention and study concerns the behaviour of columns made of rolled stainless steel angles. This paper describes an experimental campaign made on rolled stainless steel angles under axial compression. The tests were performed on stainless steel rolled angles with lengths varying from 150 mm to 1400 mm while the collapse involved: flexural-torsional and flexural buckling modes. © 2019 Taylor & Francis Group, London, UK.

关键词： Hot rolling

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TinyOS-Based WSN Performance: Default Active Message Layer vs. TKN15.4 1

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6th International Conference on Sensor Networks, SENSORNETS 2017 and 7th International Conference on Sensor Networks, SENSORNETS 2018

作者： Queiroz, Diego V. Benavente-Peces, Cesar Gomes, Ruan D. Signal Theory and Communications Department Universidad Politecnica de Madrid Madrid Spain Informatics Coordination Federal Institute of Paraiba Guarabira Brazil Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

ISBN: (数字)9783030301101

ISBN: (纸本)9783030301095

The applications aimed at monitoring and controlling smart homes and buildings, health, industrial environments, traffic, energy consumption, resources, and so on, are being increasingly deployed due to the advantages they provide, increasing efficiency and decreasing costs. In this context Wireless Sensor Networks (WSN) have become a leading solution providing the appropriate mean to get and collect data and deliver it for their processing. Sensor nodes in a WSN have resource constraints, presenting low processing power and, in some cases, restrictions in power consumption. Resources availability constraints force researchers and engineers to develop proper Operating Systems (OS) aimed at low-power wireless devices, and one of the most important and in active use is the TinyOS. This paper describes an experimental analysis and evaluation which investigates relevant features and evaluates the performance (throughput, network delay, success rate, and energy consumption) of WSN under the constraint of using the low-power-consumption-aimed chosen operating system in an harsh outdoor industrial environment for with two different protocols: Active Message (AM) layer protocol and the fully 802.15.4 compliant protocol stack TKN15.4. Based on the results we conclude that TKN15.4 is better in energy consumption and success rate. On the other hand, AM protocol allows running multiple services using the same radio, but at the cost of an excessive energy consumption. © 2019, Springer Nature Switzerland AG.

关键词： Electric power utilization

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Measurement equipment for characterization of ferromagnetic materials

Measurement equipment for characterization of ferromagnetic ...

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IEEE Instrumentation and Measurement Technology Conference

作者： Tarcísio Oliveira de Moraes Raimundo Carlos Silvério Freire Débora Albuquerque Vieira Cleonilson Protásio de Souza Post-Graduate Program in Electrical Engineering - PPGEE Federal University of Campina Grande UFCG Campina Grande PB BR Federal University of Campina Grande UFCG Brazil Post-Graduate Program in Electrical Engineering - PPGEE/UFPB Federal University of Paraíba UFPB Brazil Post-Graduate Program in Electrical Engineering - PPGEE/UFPB Federal University of Paraiba João Pessoa Brazil

Ferromagnetic materials have magnetic properties which determine its magnetic field conductivity characteristics. Such characteristics are extremely important for the proper selection and use of these materials in measurement processes, for example. Therefore, this paper presents an equipment for the characterization of ferromagnetic materials constructed in a laboratory. The experimental results of this equipment are acquired and compared with the experimental results obtained with an industrially manufactured apparatus called hysteresisgraph, designed to provide magnetic characterization of magnetic materials. The results of the comparison demonstrate that the equipment presented has low relative error and can be applied in academic projects which require magnetic characterization of ferromagnetic materials developed in the laboratory.

关键词： Magnetic hysteresis Magnetic materials Magnetic flux Magnetic field measurement Magnetic cores Voltage measurement Magnetic fields

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An automatic thermal cycling based test platform for thermoelectric generator testing

An automatic thermal cycling based test platform for thermoe...

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2015 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2015

作者： Veras, Julio Cezar De Cerqueira De Souza Arruda, Bruno Willian Vieira, Debora Alburquerque Melo, Ewerton C.S. De Souza, Cleonilson Protasio Coordination Section of Electronics Federal Institute of Pernambuco - IFPE Campus de Garanhuns Garanhuns Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Department of Electrical Engineering Federal University of Paraíba - UFPB João Pessoa Paraíba Brazil

ISBN: (纸本)9781479961139

Thermoelectric (TE) modules are solid-state devices that convert directly thermal energy in electrical energy. However, they can undergo performance degradation due to thermal cycling. In the present study, a control-based test platform that is capable to apply specific thermal cycling pattern at periodic intervals is presented in order to evaluate performance degradation that influence the TE module lifetime. Using this test platform, some parameters and the figure of merit ZT of a commercial TE module are measured before and after thermal cycling application. An important feature of the proposed platform is that the applied thermal cycling is bipolar, that is, it is possible to apply positive or negative temperature difference and, through this, performance degradation would be observed after only 548 thermal cycles much lower than previous works. © 2015 IEEE.

关键词： Thermal cycling

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Modeling and control of the modular multilevel cascade converter based on chopper-cells

Modeling and control of the modular multilevel cascade conve...

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Brazilian Power Electronics Conference, COBEP

作者： B. E. O. B Luna C. B. Jacobina A. C. Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) PB Brazil

This paper presents the modular multilevel cascade converter (MMCC) based on chopper-cells suitable to medium and high voltage systems without line-frequency transformers. This converter is characterized by a modular arm structure composed by cascaded chopper-cells with floating dc capacitors. The arm structure requires average voltage control and voltage-balancing control of the dc capacitors. This paper proposes a continuous model and a control method to achieve rigid and stable voltage control of all the floating dc capacitors under common operating conditions. The validity of the theory is confirmed by computer simulation and experiment.

关键词： Capacitors Voltage control Power harmonic filters Harmonic analysis Equations Pulse width modulation Mathematical model

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Towards a Robotic Knee Exoskeleton Control Based on Human Motion Intention through EEG and sEMGsignals

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Procedia Manufacturing 2015年 3卷 1379-1386页

作者： Villa-Parra, A.C. Delisle-Rodríguez, D. López-Delis, A. Bastos-Filho, T. Sagaró, R. Frizera-Neto, A. Post-Graduate Program in Electrical Engineering Universidade Federal do Espírito Santo Vitória Brazil GIIB Universidad Politécnica Salesiana Cuenca Ecuador Center of Medical Biophysics Universidad de Oriente Santiago Cuba Mechanical and Design Engineering Department Universidad de Oriente Santiago Cuba

The integration of lower limb exoskeletons with robotic walkers allows obtaining a system to improve mobility and security during gait rehabilitation. In this work, the evaluation of human motion intention (HMI) based on electroencephalogram (EEG) and surface electromyography (sEMG) signals are analyzed for a knee exoskeleton control as a preliminary study for gait neuro-rehabilitation with a hybrid robotic system. This system consists of the knee exoskeleton H2 and the UFES's Smart Walker, which are used to restore the neuromotor control function of subjects with neural injuries. An experimental protocol was developed to identify patterns to control the exoskeleton in accordance with the HMI-based on EEG/sEMG. The EEG and sEMG signals are recorded during the following activities: stand-up/sit-down and knee flexion/extension. HMI is analyzed through both event-related desynchronization/synchronization (ERD/ERS) and slow cortical potential, as well as the myoelectric pattern classification related to lower limb. The feature extraction from sEMG signals is based on vector combinations in time and frequency domain which are used for a pattern classification stage trough an artificial neural network with Levenberg Marquadt training algorithm and support vector machine. Preliminary results shown that a combination of EEG/sEMG signals can be used to define a control strategy for the robotic system. © 2015 The Authors

关键词： EEG Human-motion-intention Knee exoskeleton Pattern recognition sEMG

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An ontology-driven framework to support scenario representation in a 3D operator training simulator

An ontology-driven framework to support scenario representat...

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International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH)

作者： Flávio Torres Filho Maria de Fátima Queiroz Vieira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Brazil

This paper presents a framework to support the development of three-dimensional virtual scenarios for an operator training simulator for electrical systems. Given the need to represent a variety of scenarios of interest, this can be an effort and time consuming task. The proposed framework promotes a systematic approach when building scenarios and is supported by tools from the ontology-based domain. An editing tool is also under construction. As it will be discussed in the paper, this approach resulted in the simplification of the scenario building process which is achieved by interchanging descriptions at different levels of abstraction. The descriptions concern the situation to be represented; plant objects' representation, both visual and behavioural, the latter represented as Coloured Petri Nets (CPN) models.

关键词： Training Ontologies Solid modeling Three-dimensional displays Buildings Substations Virtual environments

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Alternative breed of three-phase four-wire shunt compensators based on cascaded transformer with single dc-link 32

Alternative breed of three-phase four-wire shunt compensator...

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32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017

作者： De Almeida Carlos, Gregory A. Jacobina, Cursino B. Dos Santos, Euzeli C. Palmeira dos ÍndiosAL 57601-220 Brazil Post-Graduate Program in Electrical Engineering-PPgEE-Copele Campina GrandePB 58429-900 Brazil Campina GrandePB 58429-900 Brazil IndianapolisIN46202 United States

ISBN: (纸本)9781509053667

This paper introduces a new breed of four-wire (4W) multilevel shunt compensator to deal with either harmonic or reactive power compensation. The converter configurations are generalized for K-stages and the main benefits of proposed topologies lie on i) multilevel waveforms generation, ii) single dc-link unit and iii) modular characteristic. The configurations are based on cascaded transformers along with three-phase-bridge (TPB) converters. These converters are directly connected to the transformer primary side. A suitable PWM strategy combined with an appropriate transformer turns ratio guarantees the desirable multilevel output waveforms. The modularity feature provides simple maintenance and makes the proposed shunt active power filters (SAPFs) an attractive solution in comparison with conventional configurations. The configuration model and overall control are addressed, as well. Simulation and experimental results are presented for theoretical validation. © 2017 IEEE.

关键词： Power converters

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Shunt active power filter based on cascaded transformers coupled with three-phase bridge converters 31

Shunt active power filter based on cascaded transformers cou...

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31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016

作者： De Almeida Carlos, Gregory A. Jacobina, Cursino B. Méllo, João Paulo R. A. Dos Santos, Euzeli C. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande PB58429-900 Brazil Campina Grande PB58429-900 Brazil Palmeira dos Índios AL57601-220 Brazil IndianapolisIN46202 United States

ISBN: (纸本)9781467383936

This paper proposes a multilevel shunt active power filter (SAPF) to deal with either harmonic currents compensation or reactive power compensation. Such a device can reduce the harmonic distortion at the grid currents provided by non-linear loads located in stiff systems. The proposed SAPF is based on three-phase bridge (TPB) converters connected to cascaded single-phase transformers. The transformers arrangement permits the compensator to use a single dc-link unit which simplifies the control strategy and number of sensors. The multilevel waveforms are generated by using a suitable PWM strategy associated with the transformers turns ratio. Modularity and simple maintenance make the proposed SAPF an attractive solution compared to some conventional configurations. The model, PWM technique and control strategy, are presented as well as studies considering harmonic distortion and semiconductor losses estimation. Simulation and experimental results are presented in order to validate theoretical approaches. © 2016 IEEE.

关键词： Harmonic distortion

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