Papers by JOSE ROBERTO CARDOSO CARDOSO
Proceedings of the 15th International Conference on Informatics in Control, Automation and Robotics, 2018
The abstract The Ventricular Assist Device (VAD) is a mechatronic device used to treat patients w... more The abstract The Ventricular Assist Device (VAD) is a mechatronic device used to treat patients with heart failure who are able to use them in short-and long-term strategies. However, with increasing population longevity, long-term use has been intensified. Thus, the development of resources that improve the robustness and reliability of these devices is justified. This work proposes an in vitro test bench with intelligent behaviour that through a systematic of protocols for the collection, treatment and monitoring of reliability data, coming from standard curves of monitored variables, such as: flow, pressure, vibration, rotation, density, viscosity and temperature, provides a decision support system with user friendly interface for verification, validation and certification of VAD. The proposed method is descriptive of an in vitro test bed model for VAD that considers the use of Petri net for validation of the dynamic behaviour in front of the variables and a decision support system based on big data analytics technology with extraction of dada, which subsidizes intelligent behaviour. The proposed model is consistent with the bibliographic base and its validation. The Petri net allows confirming its application in the decision making, with intelligent behaviour, from the data mining.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2011
This paper presents an evaluation of the phase shifting excitation and load effects in a Transmis... more This paper presents an evaluation of the phase shifting excitation and load effects in a Transmission Line Exciting Chamber. This chamber is suggested as an alternative for immunity tests because of the restrictions related to canonical chambers. Here, two methods are used to calculate the E-field: a semi-analytic approach and a numerical one. The semi-analytic method is based on the modal expansion while a software is used for numerical simulations. The results regarding the E-field profile and the related statistical indexes of merit are presented and used to evaluate the chamber performances. Experiments were also conducted in order to evaluate the chamber. Index Terms-Reverberation chamber, random excitations and loads, transmission lines. I. INTRODUCTION Canonical chambers-like Reverberation Chambers (RC) and TEM chambers-are generally used for electromagnetic immunity testing despite their particular operational restrictions. RCs using mechanical paddles or frequency stirring provide a statistical E-field uniformity in all the directions inside the working volume [1], [2]. Nevertheless, the operation frequency of RCs is inversely proportional to the chamber dimensions and it is a constraint for low frequency tests. The international standards recommend the RC configuration for immunity tests over 80 MHz frequencies [2], [3]. Among the first published works concerning RCs we can mention [4],[5], [6], and [7]. These authors have proposed two different approaches in order to change the boundary conditions inside the chamber: constant rotating paddles and step-by-step paddles. On the contrary, TEM chambers operate in the low frequency range. Introducing a stripline inside the chamber, a deterministic E-field uniformity is reached over a working area parallel to the plate, but not for all the polarizations in the chamber volume. Some early works with TEM cells were proposed by [8]. The performances of the TEM cells were extended in all polarizations using three orthogonal striplines [9]. An overview on the usual electromagnetic compatibility test methods is presented in [10], and herein a comprehensive list of references on these methods can be founded. Recently, an alternative concept called Transmission Line Exciting Chamber (TLEC) has been
Renewable Energy and Power Quality Journal, 2011
The use of doubly fed induction generator in wind power plants has result in new necessities to m... more The use of doubly fed induction generator in wind power plants has result in new necessities to maintain a reliable operation of the network. The tendency of the grid codes is to require the ability from the wind power plant to keep connected during and after grid disturbance, similarly to the synchronous generators requirements. This paper analyse the behaviour of a wind power plant equipped with doubly fed induction generators connected to a transmission system during grid fault and compare its performance with a conventional synchronous generator based power plant. The results have shown that the conventional synchronous generator has much more effective injection of reactive power during grid fault and, by consequence, the terminal voltage is kept in higher levels.
Sba: Controle & Automação Sociedade Brasileira de Automatica, 2005
Este trabalho apresenta uma metodologia para a determinação da densidade superficial de carga em ... more Este trabalho apresenta uma metodologia para a determinação da densidade superficial de carga em duas estruturas simples, um fio reto finito e uma chapa plana quadrada ambas submetidas a um potencial constante. A metodologia envolve o método dos momentos, utilizando como função de expansão as wavelets de Haar ao invés da função pulso, visando a obtenção de uma boa precisão e de uma redução no esforço computacional. Através de um artifício matemático, podemos selecionar um limiar em porcentagem que permite descartar valores próximos de zero, sem grandes variações no resultado final. Apresentamos também as vantagens computacionais, que podemos obter através da decomposição de Cholesky.
2015 ASEE Annual Conference and Exposition Proceedings
He currently serves as an executive member of the International Federation of Engineering Educati... more He currently serves as an executive member of the International Federation of Engineering Education Societies (IFEES), as Vice President for Student Engagement, Diversity, and Inclusion. IFEES aims to strengthen engineering education practices around the world. He has recently completed his tenure as a Fulbright Scholar and is currently performing research as a FAPESP postdoctoral researcher with Prof. Dr. Jose Roberto Cardoso at the Escola Politécnica da Universidade de São Paulo for his project titled "Assessing the Impact of One Boundary Spanner on University-wide STEM Educational Engagement" where he will attempt to optimize community/university relations for broadening participation in the STEM fields." He has ambitions to significantly diversify and broaden the global pipeline of STEM talent and help guide the evolution of the methods used to develop engineers.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2011
The transverse flux permanent magnet machines have become an interesting possibility for offshore... more The transverse flux permanent magnet machines have become an interesting possibility for offshore wind turbines. These machines have the highest relation between electrical torque and weight of active materials. The pole pair modular construction could eliminate or lower the gear ratio used in conventional wind turbines. This paper presents a dynamic model of a wind turbine equipped with a transverse flux permanent magnet generator connected to a direct-current power system using a combination of 3D finite element generator model and an aerodynamic model. The results indicate that the model can give accurate response for steady-state operation and for wind speed variations.
Exacta, 2008
In this work, a software package based on the Delaunay’s algorithm is described. The main feature... more In this work, a software package based on the Delaunay’s algorithm is described. The main feature of this package is the capability in applying discretization in geometric domains of teeth taking into account their complex inner structures and the materials with different hardness. Usually, the mesh generators reported in literature treat molars and other teeth by using simplified geometric models, or even considering the teeth as homogeneous structures.
Sba: Controle & Automação Sociedade Brasileira de Automatica, 2005
O presente trabalho traz o estudo da simulação do desempenho (simulação de marcha) de uma composi... more O presente trabalho traz o estudo da simulação do desempenho (simulação de marcha) de uma composição ferroviária acionada através de inversores de tensão e motores de indução e alimentada em corrente contínua, um tipo de material rodante recentemente introduzido no Brasil. Tal fato faz com que seja necessário o desenvolvimento de métodos de análise das características deste tipo de material, objetivo maior deste trabalho. A metodologia de análise aqui desenvolvida tem como base a teoria da tração elétrica para o equacionamento da dinâmica do movimento, a teoria do controle do motor de indução e a teoria do funcionamento do próprio motor de indução para a obtenção da corrente captada por esta composição, o principal resultado obtido. A aplicação desta metodologia é dada através da simulação de uma composição em um trecho ferroviário. Uma análise posterior dos resultados estudados traz a possibilidade de uma simplificação do método de obtenção da corrente captada. Tal possibilidade é ...
Exacta, 2008
Neste trabalho, analisa-se o desempenho dinâmico de dois métodos para melhorar a estabilidade de ... more Neste trabalho, analisa-se o desempenho dinâmico de dois métodos para melhorar a estabilidade de turbinas eólicas de velocidade fixa, equipadas com geradores de indução, conectadas em redes de distribuição de energia elétrica, durante contingências no sistema elétrico. O primeiro método se baseia na compensação dinâmica de potência reativa, para o qual foram utilizadas duas tecnologias: compensação via SVC (Static Var Compensator) e compensação via DSTATCOM (Distribution Static Synchronous Compensator). O segundo se baseia no controle de ângulo de passo das hélices das turbinas eólicas. O desempenho desses geradores durante curtos-circuitos trifásicos é analisado para se verificar o impacto do uso de diferentes sinais de controle nos dispositivos eletrônicos e mecânicos. De forma geral, os dispositivos de compensação dinâmica tiveram melhor desempenho quando controlados por tensão terminal, e os mecânicos, utilizando a velocidade do rotor ou uma combinação de sinais (tensão terminal...
Exacta, 2008
As características de operação do sistema de tração elétrica metroferroviária podem ser predeterm... more As características de operação do sistema de tração elétrica metroferroviária podem ser predeterminadas por meio de simulação a partir de modelos matemáticos. A simulação digital é uma importante ferramenta de apoio ao projeto e permite um ensaio das alternativas a custo reduzido, viabilizando sua posterior comparação. Em razão de sua importância, este trabalho tem como objetivo a conceituação, de forma sintética, da simulação do sistema de tração elétrica, seus métodos e modelos. Esta conceituação aborda, primeiramente, o estudo do movimento de um trem em uma linha e a sua modelagem matemática. Em seguida, o trabalho analisa a simulação de tráfego e a representação do circuito elétrico que alimenta os trens, em termos físicos e matemáticos. Por fim, este trabalho traz a proposta e a aplicação de um método numérico para a solução do sistema que representa este circuito elétrico de alimentação.
IEEE Transactions on Magnetics, 1998
Tóth, F.: Bibliographical survey on the construction, application and theory of the linear indu... more Tóth, F.: Bibliographical survey on the construction, application and theory of the linear induction and synchronous motors (în limba maghiară),
IEEE Transactions on Magnetics, 2003
A combined wavelet-element free Galerkin (EFG) method is proposed for solving electromagnetic (EM... more A combined wavelet-element free Galerkin (EFG) method is proposed for solving electromagnetic (EM) field problems. The bridging scales are used to preserve the consistency and linear independence properties of the entire bases. A detailed description of the development of the discrete model and its numerical implementations is given to facilitate the reader to understand the proposed algorithm. A numerical example to validate the proposed method is also reported.
IEEE Transactions on Magnetics, 2009
This paper presents a procedure for evaluating the performance of reverberation chambers, by appr... more This paper presents a procedure for evaluating the performance of reverberation chambers, by approximating the maximum working volume in a given configuration. The evaluation of this volume is based on the geometrical and physical constraints, like the ones related to the internal E-field distribution recommended by standards. The importance of the present work is related to the development of a non-canonical reverberation chamber configuration, whose excitation is carried out by transmission lines, instead of antennas plus paddles.
IEEE Transactions on Magnetics, 2010
This paper presents a hybrid mono/multiobjective optimization approach based on numerical, statis... more This paper presents a hybrid mono/multiobjective optimization approach based on numerical, statistical, and fitness evaluation concerning the conductor positions in a transmission line excitation chamber (TLEC). The field profile and the related indexes of merit, as well as statistical ones, regarding the working volumes (WVs) are used to evaluate the chamber configuration performance. The compromise between WV and-field, constrained by the-field standard deviation, is shown through Pareto's front. An index of merit based on area calculation under Pareto's front is defined and used for transmission line set comparison.
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2006
PurposeThis paper aims to present an evaluation of the crosstalk models developed for a shareware... more PurposeThis paper aims to present an evaluation of the crosstalk models developed for a shareware version of Spice.Design/methodology/approachThe transmission line model is compared with π lumped circuit models by varying the number of cells. The influence of losses is also introduced, and some constraints regarding the models are examined, showing the suitability of the new Spice libraries developed by the authors. In order to validate the theoretical results some experiments were carried out.FindingsThe paper finds that Spice is a powerful engineering tool for students and technicians involved in EMC analyses.Originality/valueThe main aspects concerning the accuracy and integrity of the experimental data are emphasized and discussed in this paper.
Energies, 2010
In the last 15 years, the use of doubly fed induction machines in modern variable-speed wind turb... more In the last 15 years, the use of doubly fed induction machines in modern variable-speed wind turbines has increased rapidly. This development has been driven by the cost reduction as well as the low-loss generation of Insulated Gate Bipolar Transistors (IGBT). According to new grid code requirements, wind turbines must remain connected to the grid during grid disturbances. Moreover, they must also contribute to voltage support during and after grid faults. The crowbar system is essential to avoid the disconnection of the doubly fed induction wind generators from the network during faults. The insertion of the crowbar in the rotor circuits for a short period of time enables a more efficient terminal voltage control. As a general rule, the activation and the deactivation of the crowbar system is based only on the DC-link voltage level of the back-to-back converters. In this context, the authors discuss the critical rotor speed to analyze the instability of doubly fed induction generators during grid faults.
A solution of two-dimensional magnetohydrodynamic flow using the finite element method
IEEE Transactions on Magnetics, 1998
IEEE TRANSACTIONS ON MAGNETICS, VOL 34, NO 5 , SEPTEMBER 1998 ... A ~olution of Two-Dimensional M... more IEEE TRANSACTIONS ON MAGNETICS, VOL 34, NO 5 , SEPTEMBER 1998 ... A ~olution of Two-Dimensional Magnetohydrodynamic Flow Using the Finite Element Method ... Sergio Luis Lopes Verardi and JosC Roberto Cardoso, Member, IEEE Escola PolitCcnica - USP - AV. ...
Technological …, 2011
Luis M. Camarinha-Matos (Ed.): DoCEIS 2011, IFIP AICT 349, pp. 375382, 2011. © IFIP Internationa... more Luis M. Camarinha-Matos (Ed.): DoCEIS 2011, IFIP AICT 349, pp. 375382, 2011. © IFIP International Federation for Information Processing 2011 ... Design of Supervisory Control System for Ventricular ... André Cavalheiro1, Diolino Santos Fo.1, Aron Andrade2, José Roberto Cardoso1, ...
Three-Dimensional Finite Element Analysis of Multi-Layered Systems
University of illinois, 2000
Uploads
Papers by JOSE ROBERTO CARDOSO CARDOSO