Papers by Leonardo Mesquita
Hardware implementation of Type-2 Programmable
— The design of full programmable type-2 membership function circuit is presented in this paper. ... more — The design of full programmable type-2 membership function circuit is presented in this paper. This circuit is used to implement the fuzzifier block of Type-2 Fuzzy Logic Controller chip. In this paper the type-2 fuzzy set was obtained by blurring the width of the type-1 fuzzy set. This circuit allows programming the height and the shape of the membership function. It operates in current mode, with supply voltage of 3.3V. The simulation results of interval type-2 membership function circuit have been done in CMOS 0.35µm technology using Mentor Graphics software. Keywords-component; Membership function circuit, Type-2 fuzzy logic, Interval type-2 fuzzy logic controller. I.
Architecture Proposal of Analog Interval TYPE-2 Fuzzy Logic Inference Systems
Journal of Exact Sciences, 2013
This paper proposes an architecture for analog implementation of a Type-2 Fuzzy Inference Circuit... more This paper proposes an architecture for analog implementation of a Type-2 Fuzzy Inference Circuit, which is the main block of the Interval Type-2 Fuzzy Logic Controller (IT2FLC) chip. This architecture is composed of Minimum (Min) and Maximum (Max) circuits. The former are used to combine the antecedents of the rules and the later are used to combine the consequents currents of the rule (from the type-2 fuzzifier circuit). These circuits operate in current mode, with a supply voltage of 3.3V. The proposed architecture (which consists of two inputs with two membership functions for each one, four rules, and one output with three membership functions) was validated through Mentor Graphics simulation in a 0.35µm CMOS technology. The Mentor simulation result of the proposed architecture was compared with similar a Type-2 Fuzzy Inference System simulated in Interval Type-2 Fuzzy Logic Toolbox from Matlab.
Education and New Developments 2019, 2019
This paper aims to propose a procedure for the use of robotics in physics teaching based on a mod... more This paper aims to propose a procedure for the use of robotics in physics teaching based on a model of project-based learning (PBL). The procedure was applied during one semester to high school students of two public schools in Guaratinguetá, in the Valley of the Paraíba SP. The methodological approach employed was Action Research, with the involvement of Physics teachers from the partner schools, working together with teachers and students from São Paulo State University (UNESP) – Guaratinguetá Campus. The motivation for the development of the project is the lack of both laboratories and materials for experimental activities observed in Brazilian public schools. In this context, considering the recommendation of the National Curricular Parameters for Secondary Education for the use of technology in the classroom, we have opted for the insertion of educational robotics through the development of a mobile robot in the form of a teaching project. Educational Robotics, besides being a ...
Journal of Exact Sciences, 2014
Pode-se afirmar com seguranca que as baterias, tanto as celulas primarias, como as celulas secund... more Pode-se afirmar com seguranca que as baterias, tanto as celulas primarias, como as celulas secundarias sao a forma mais popular de armazenamento de energia e sua aplicacao vem aumentando de forma significativa ao longo das ultimas decadas, estando ainda longe de alcancar o seu apice. Apesar da crescente aplicacao das baterias e do montante dos negocios envolvidos nesta area os cursos de engenharia eletrica ainda nao oferecem cursos voltados para a aplicacao de baterias. O objetivo deste artigo e apresentar uma resenha envolvendo os principais conceitos que abrangem o tema sem a profundidade requerida por um fisico, quimico ou engenheiro de materiais, mas que sejam suficientes para que o Engenheiro Eletricista seja capaz de acompanhar as principais novidades tecnologicas na area; especificar corretamente uma bateria para uma dada aplicacao e entender e vislumbrar novas aplicacoes para esses dispositivos.
Implementation of fuzzy logic controllers using FPGA or ASIC
Fuzzy logic controllers are generally implemented using on general-purpose microprocessors being ... more Fuzzy logic controllers are generally implemented using on general-purpose microprocessors being that this kind of implementation produces very satisfactory results in application of control. In this paper will be presented other abordagens of implementations, FPGA or ASIC, used for produce systems of control based in the fuzzy logic. FPGA allows to the designer to make future modifications of way more quick and more efficient, when compared with implementations by microprocessors, being that the modifications can be carried out on-board. Another great advantage of the implementation of fuzzy logic controller based in FPGA is the use of some hardware programming language, as VHDL or VERILOG, that becomes the independent project developed of the manufacturer of the programmable device. ASIC also can be developed agreement with the specifications of a data customer, being then possible to optimize the maximum the performance of the system of control.
Arquiteturas programáveis de uma máquina de inferência para uso em microprocessadores fuzzy em tecnologia CMOS
Anais do 4. Congresso Brasileiro de Redes Neurais, 2016
In this paper a new topology to membership function circuits is proposed. This architecture is al... more In this paper a new topology to membership function circuits is proposed. This architecture is all modulated, thus, it is possible to generate membership functions in triangular or trapezoidal shape. It was developed in order to be used as part of fuzzy microprocessors. An integrated circuit in bipolar technology was developed for architecture verification; so, it can also be implemented in technology CMOS. A description of each block that composes the circuit is done in this paper, as well as a discussion regarding those circuits. The results obtained from these simulations are also discussed. Six modules of the circuit were implemented in the accomplished simulation, what facilitated to generate five membership functions, either triangular or trapezoidal shapes. The results show that the new architecture is fully viable of being accomplished used as part of a fuzzy microprocessor.
The use of intelligent controllers applied to industrial systems has been getting usual, not only... more The use of intelligent controllers applied to industrial systems has been getting usual, not only in the process control as in the literature. The most utilized control methodology, within the artificial intelligent techniques, is based in fuzzy logic. Fuzzy logic controllers consist of the following modules: fuzzification, decision making and defuzzification. Various defuzzification circuits architecture have been proposed in the literature. The efficacy of a fuzzy logic controller depends very much on defuzzification process. This paper aims to present the project for an analog defuzzifier circuit operating in current-mode to be implemented in CMOS 0.35? AMS. From the hardware point of view, the main characteristics of the proposed defuzzifier circuit are simplified architecture, small chip area and low power-supply voltage. The simulation result of each defuzzifier circuit block will be presented: scaling, addition and division. And also, the output current graphic of the complete circuit, compared with theoretical values. All simulation results have been obtained by the use of SPICE software. The proposed circuit in this work is part of a general-purpose fuzzy microprocessor, and can be applied to many control systems, as for example the control of a DC motor
Simulation of Active Control Using Fuzzy Logic Applied to a Pulse Combustor
Journal of the Brazilian Society of Mechanical Sciences, 2002
ABSTRACT This work analyzes an active fuzzy logic control system in a Rijke type pulse combustor.... more ABSTRACT This work analyzes an active fuzzy logic control system in a Rijke type pulse combustor. During the system development, a study of the existing types of control for pulse combustion was carried out and a simulation model was implemented to be used with the package Matlab and Simulink. Blocks which were not available in the simulator library were developed. A fuzzy controller was developed and its membership functions and inference rules were established. The obtained simulation showed that fuzzy logic is viable in the control of combustion instabilities. The obtained results indicated that the control system responded to pulses in an efficient and desirable way. It was verified that the system needed approximately 0.2 s to increase the tube internal pressure from 30 to 90 mbar, with an assumed total delay of 2 ms. The effects of delay variation were studied. Convergence was always obtained and general performance was not affected by the delay. The controller sends a pressure signal in phase with the Rijke tube internal pressure signal, through the speakers, when an increase the oscillations pressure amplitude is desired. On the other hand, when a decrease of the tube internal pressure amplitude is desired, the controller sends a signal 180º out of phase.
lsi.usp.br
Universidade estadual Paulista - UNESP Campus de Guaratingueta Av. Dr Ariberto P. Cunha, 333, Ped... more Universidade estadual Paulista - UNESP Campus de Guaratingueta Av. Dr Ariberto P. Cunha, 333, Pedregulho Guaratinguetá - São Paulo Brazil. CEP. 12516-410 Departamento de Engenharia Elétrica Tel.: +55 12 525 2800 ext. 238 email: [email protected] ...
Estudo da influência do desequilíbrio de tensão na na operação de motores de indução trifásicos
Anais da XIV Conferência Brasileira sobre Qualidade da Energia Elétrica
IFAC Proceedings Volumes
An intelligent system that emulates human decision behaviour based on visual data acquisition is ... more An intelligent system that emulates human decision behaviour based on visual data acquisition is proposed. The approach is useful in applications where images are used to supply information to specialists who will choose suitable actions. An artificial neural classifier aids a fuzzy decision support system to deal with uncertainty and imprecision present in available information. Advantages of both techniques are exploited complementarily. As an example, this method was applied in automatic focus checking and adjustment in video monitor manufacturing.
Implementação De Processador Digital Baseado Em Lógica Fuzzy Usando Um Fpga
The 4th International Congress on University Industry Cooperation, Nov 28, 2012
Resumo. O presente trabalho analisa um sistema de controle de lógica difusa para um combustor pul... more Resumo. O presente trabalho analisa um sistema de controle de lógica difusa para um combustor pulsante tipo tubo de Rijke. Durante o desenvolvimento do mesmo, realizou-se um estudo dos tipos de controle existentes para a combustão pulsante e foi proposto um modelo de simulação a ser utilizado pelo pacote Matlab e Simulink. Uma planta de controle foi utilizada para o desenvolvimento do sistema. Um controlador difuso foi desenvolvido e suas funções de pertinência e regras de inferência foram estabelecidas. A simulação realizada mostrou que a lógica difusa no controle de instabilidades de combustão é viável. Através dos resultados pôde-se inferir que o controle respondeu aos impulsos colocados de maneira eficiente e conforme o desejado. Verificou-se que o controle precisou de aproximadamente 0,2 s para elevar a pressão interna do tubo de 30 mbar para 90 mbar, considerando-se um atraso total de 2 ms. Estudaram-se os efeitos da variação do atraso e verificou-se que, mesmo levando-se um maior tempo para se conseguir a convergência, esta ocorre, não influenciando no desempenho geral. O controlador envia um sinal de pressão em fase com o sinal de pressão interno ao tubo, através dos alto-falantes, quando se deseja aumentar a pressão de oscilação. Quando se deseja diminuir a onda de pressão interna ao tubo, o controlador envia um sinal de controle defasado 180º ao sinal.
Elementos de Lógica Programável com VHDL e DSP - Teoria e Prática
ABSTRACT
Design of CMOS current-mode multiplier-divider circuit for type-2 FLC applications
2015 IEEE 6th Latin American Symposium on Circuits & Systems (LASCAS), 2015
Resumo-Este artigo descreve uma metodologia para o desenvolvimento de um controlador digital de v... more Resumo-Este artigo descreve uma metodologia para o desenvolvimento de um controlador digital de velocidade de motor, sintetizado em FPGA – Field Programmable Gate Array, na qual todo o sistema proposto é modelado e simulado no software MATLAB. Esta ferramenta permite que o módulo de controle digital em conjunto com os módulos analógicos, que representam os circuitos de acionamento e o modelo do motor sob controle, possam ser analisados, em nível de simulação, de forma única e eficiente no mesmo ambiente de desenvolvimento. Um controlador PWM usado para controlar a velocidade de um motor universal foi desenvolvido de modo a validar a metodologia de projeto apresentado neste artigo. Palavras-chaves – VHDL, Verilog, FPGA. I. INTRODUÇÃO as décadas de 80 e 90 os controladores de motor eram implementados na sua grande maioria por circuitos analógicos. Atualmente, com o avanço tecnológico, os projetistas têm optado por controladores digitais buscando obter maior desempenho, maior eficiênci...
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Papers by Leonardo Mesquita