Controle vetorial de velocidade de uma máquina de indução sem mancais trifásica com bobinado dividido utilizando estimação neural de fluxo

This work describes the study and the implementation of the vector speed control for a three-phase Bearingless induction machine with divided winding of 4 poles and 1,1 kW using the neural rotor flux estimation. The vector speed control operates together with the radial positioning controllers and with the winding currents controllers of the stator phases. For the radial positioning, the forces controlled by the internal machine magnetic fields are used. For the radial forces optimization , a special rotor winding with independent circuits which allows a low rotational torque influence was used. The neural flux estimation applied to the vector speed controls has the objective of compensating the parameter dependences of the conventional estimators in relation to the parameter machine s variations due to the temperature increases or due to the rotor magnetic saturation. The implemented control system allows a direct comparison between the respective responses of the speed and radial positioning controllers to the machine oriented by the neural rotor flux estimator in relation to the conventional flux estimator. All the system control is executed by a program developed in the ANSI C language. The DSP resources used by the system are: the Analog/Digital channels converters, the PWM outputs and the parallel and RS-232 serial interfaces, which are responsible, respectively, by the DSP programming and the data capture through the supervisory system

Metodologia para modelagem, validação e programação de controladores lógicos industriais usando statecharts básicos

Due of industrial informatics several attempts have been done to develop notations and semantics, which are used for classifying and describing different kind of system behavior, particularly in the modeling phase. Such attempts provide the infrastructure to resolve some real problems of engineering and construct practical systems that aim at, mainly, to increase the productivity, quality, and security of the process. Despite the many studies that have attempted to develop friendly methods for industrial controller programming, they are still programmed by conventional trial-and-error methods and, in practice, there is little written documentation on these systems. The ideal solution would be to use a computational environment that allows industrial engineers to implement the system using high-level language and that follows international standards. Accordingly, this work proposes a methodology for plant and control modelling of the discrete event systems that include sequential, parallel and timed operations, using a formalism based on Statecharts, denominated Basic Statechart (BSC). The methodology also permits automatic procedures to validate and implement these systems. To validate our methodology, we presented two case studies with typical examples of the manufacturing sector. The first example shows a sequential control for a tagged machine, which is used to illustrated dependences between the devices of the plant. In the second example, we discuss more than one strategy for controlling a manufacturing cell. The model with no control has 72 states (distinct configurations) and, the model with sequential control generated 20 different states, but they only act in 8 distinct configurations. The model with parallel control generated 210 different states, but these 210 configurations act only in 26 distinct configurations, therefore, one strategy control less restrictive than previous. Lastly, we presented one example for highlight the modular characteristic of our methodology, which it is very important to maintenance of applications. In this example, the sensors for identifying pieces in the plant were removed. So, changes in the control model are needed to transmit the information of the input buffer sensor to the others positions of the cell

Controle vetorial de velocidade de um motor de indução trifásico com estimação neural de fluxo

This work describes the study and the implementation of the speed control for a three-phase induction motor of 1,1 kW and 4 poles using the neural rotor flux estimation. The vector speed control operates together with the winding currents controller of the stator phasis. The neural flux estimation applied to the vector speed controls has the objective of compensating the parameter dependences of the conventional estimators in relation to the parameter machine s variations due to the temperature increases or due to the rotor magnetic saturation. The implemented control system allows a direct comparison between the respective responses of the speed controls to the machine oriented by the neural rotor flux estimator in relation to the conventional flux estimator. All the system control is executed by a program developed in the ANSI C language. The main DSP recources used by the system are, respectively, the Analog/Digital channels converters, the PWM outputs and the parallel and RS-232 serial interfaces, which are responsible, respectively, by the DSP programming and the data capture through the supervisory system

Uma proposta de regulador nebuloso para geradores eólicos de indução

This work presents a proposal for a voltage and frequency control system for a wind power induction generator. It has been developed na experimental structure composes basically by a three phase induction machine, a three phase capacitor and a reactive static Power compensator controlled by histeresys. lt has been developed control algorithms using conventional methods (Pl control) and linguistic methods (using concepts of logic and fuzzy control), to compare their performances in the variable speed generator system. The control loop was projected using the ADJDA PCL 818 model board into a Pentium 200 MHz compu ter. The induction generator mathematical model was studied throught Park transformation. It has been realized simulations in the Pspice@ software, to verify the system characteristics in transient and steady-state situations. The real time control program was developed in C language, possibilish verify the algorithm performance in the 2,2kW didatic experimental system

Controle inteligente aplicado a uma mesa de coordenadas de dois graus de liberdade

This work presents the design and construction of an X-Y table of two degrees of freedom, as well as the development of a fuzzy system for its position and trajectory control. The table is composed of two bases that move perpendicularly to each other in the horizontal plane, and are driven by two DC motors. Base position is detected by position sensors attached to the motor axes. A data acquisition board performs the interface between a laptop and the plant. The fuzzy system algorithm was implemented in LabVIEW® programming environment that processes the sensors signals and determines the control variables values that drive the motors. Experimental results using position reference signals (step type signal) and straight and circular paths reference signals are presented to demonstrate the dynamic behavior of fuzzy system

Estudo e implementação em plantas físicas de um controlador preditivo generalizado com restrições

This work shows a study about the Generalized Predictive Controllers with Restrictions and their implementation in physical plants. Three types of restrictions will be discussed: restrictions in the variation rate of the signal control, restrictions in the amplitude of the signal control and restrictions in the amplitude of the Out signal (plant response). At the predictive control, the control law is obtained by the minimization of an objective function. To consider the restrictions, this minimization of the objective function is done by the use of a method to solve optimizing problems with restrictions. The chosen method was the Rosen Algorithm (based on the Gradient-projection). The physical plants in this study are two didactical systems of water level control. The first order one (a simple tank) and another of second order, which is formed by two tanks connected in cascade. The codes are implemented in C++ language and the communication with the system to be done through using a data acquisition panel offered by the system producer

Um sistema inteligente de classificação de sinais de EEG para Interface Cérebro-Computador

The Brain-Computer Interfaces (BCI) have as main purpose to establish a communication path with the central nervous system (CNS) independently from the standard pathway (nervous, muscles), aiming to control a device. The main objective of the current research is to develop an off-line BCI that separates the different EEG patterns resulting from strictly mental tasks performed by an experimental subject, comparing the effectiveness of different signal-preprocessing approaches. We also tested different classification approaches: all versus all, one versus one and a hierarchic classification approach. No preprocessing techniques were found able to improve the system performance. Furthermore, the hierarchic approach proved to be capable to produce results above the expected by literature

Ambiente de desenvolvimentoweb multiplataforma configurável para robótica educacional

We propose an online configurable multiplatform development environment specifically developed for educational robotics applications. The environment, which appears as an extension of RoboEduc software, allows the programming of several programmable robots to be performed using the R-Educ language. We make it possible for the user to program in the language R-Educ and then translate the code to a language previously registered, compiled and then sent or executed by the robot. To develop this work, we conducted a bibliographic research about the main programming languages used in robotics, as well as their definitions and paradigms, from which it was possible to define a set of patterns considered important for the creation of this environment. Then, in the software development phase, we implemented the development environment, bearing in mind the requirements and functionality defined in the design phase. Finally, to validate the platform, we conducted some trials of programming languages and verificate if the complete cycle was satisfied - registration of language, programming in R-Educ, compilation for the registered language, compilation to the machine code and send the code for the robot

Especificação e implementação de uma linguagem para transformação de modelos MOF em repositórios dMOF

This work presents the specification and the implementation of a language of Transformations in definite Models specification MOF (Meta Object Facility) of OMG (Object Management Group). The specification uses a boarding based on rules ECA (Event-Condition-Action) and was made on the basis of a set of scenes of use previously defined. The Parser Responsible parser for guaranteeing that the syntactic structure of the language is correct was constructed with the tool JavaCC (Java Compiler Compiler) and the description of the syntax of the language was made with EBNF (Extended Backus-Naur Form). The implementation is divided in three parts: the creation of the interpretative program properly said in Java, the creation of an executor of the actions specified in the language and its integration with the type of considered repository (generated for tool DSTC dMOF). A final prototype was developed and tested in the scenes previously defined

Linguagem matemática: uma proposta de ensino e avaliação da compreensão leitora dos objetos da matemática

This paper discusses aspects related to the mathematical language and its understanding, in particular, by students of final years of elementary school. Accordingly, we aimed to develop a proposal for teaching, substantiated by mathematical modeling activities and reading, which takes advantage of the student of elementary school a better understanding of mathematical language for the content of proportion. We also aim to build / propose parameters for the assessment of reading proficiency of the language of the student in analyzing and modeling process, its ability to develop/improve/enhance this proficiency. For this purpose, we develop a qualitative research, with procedures for an action research whose analysis of the data is configured as Content Analysis. We refer to epistemological and didactic, in the studies: Piaget (1975, 1990), Vygotsky (1991, 2001), Bakhtin (2006), Freire (1974, 1994), Bicudo and Garnica (2006), Smole and Diniz (2001), Barbosa (2001), Burak (1992), Biembengut (2004), Bassanezi (2002), Carrasco (2006), Becker (2010), Zuin and Reyes (2010), among others. We understand that to acquire new knowledge one must learn to read and reading to learn it, this process is essential for the development of reading proficiency of a person. Modeling, in turn, is a process which enables contact with different forms of reading providing elements favorable to the development here mentioned. The evaluation parameters we use to analyze the level of reading proficiency of mathematical language proved to be effective and therefore a valuable tool that allows the teacher an efficient evaluation and whose results can guide you better in the planning and execution of their practice

À luz das inquietas sombras: a criatividade da melancolia na linguagem de Dom Casmurro

Qué se piensa aquí, esencialmente, está a mapear el itinerario de la melancolía creativa en el discurso de Dom Casmurro; es decir, aquél de el cual el valle narrativo de una sensación de la angustia a alçar él él las maneras de la representación en el discurso de Dom Casmurro. El árbol básico en el cual éste estimaba incurre en se basa en el acuerdo de eso que la actual melancolía en el texto del machadiano se puede analizar por las estratagemas de la lengua creativa en la intención de demostrar en él una especie del espacio virtual - el conducir de metáforas, de ironies y del exacerbamento de imágenes - por cuál se prepone el narrador construir su salvación . El propósito es analizar el uso de el proyecto del alegórico y el irónico previstos por el autor en la intención de descubrir pues tales procedimientos contribuyen para crear un texto ese desestabiliza el carácter malsano de la melancolía. Puede propagar lengua creativa de tal manera cuánto otras maneras de la representación de eso las marcas del arte utilizan. Más allá de este traz poético, la contribución de este trabajo también constituye: para componer una escena en la cual el teatralidade de la lengua de Dom Casmurro constituye drama y no tragedia. Después de la pista de los conceptos de los benjaminianas de la melancolía, alegoria, metalenguaje la ironía, vimos que éstos disalign de la voluntad que los estatutos se estabilizaron de las figuras del retórico para consistir mientras que las estrategias de los discursivas. Subyacente a este proceso es posible percibir el flash del rescate de la escritura melancholic, visto bajo luz del saturnine de una mirada que si desea alegórico, en la misma incandescencia de la risa del fáustico

Processos de construção do sentido na esquizofrenia: uma perspectiva cognitiva da linguagem

There is still a lot to be said about the relationship between culture, cognition and language. Within an embodied cognition perspective to language, it may be understood that the senses generated and used in discourse are built and negotiated not only linguistically, since they also involve stereotypes, schemes, frames, etc. These cognitive structures, in turn, would emerge from subjects experiences and interactions with a sociohistorically constituted environment. With that in mind, what would happen if someone had an altered view in the perception of such environment? The objective of this master s thesis was to understand the process of meaning construction, aiming at the activation of frames, in the discourse of people who have been diagnosed as schizophrenic and have been hospitalized, that is, individuals who have their socio-environmental perception affected. With that aim in mind, a speech corpus was generated with three schizophrenic patients from Professor Severino Lopes Psychiatric Hospital. The data were collected and analyzed qualitatively, based on the theoretical and analytical premises of Cognitive Linguistics, more specifically, of Simulation Semantic perspective. Therefore, it was possible to identify aspects related to meaning construction processes in the discourse of schizophrenic patients, understanding that language is integrated with cognition and culture. Therefore, the alteration in the way experiences are perceived by schizophrenic patients affect the linguistic production of these subjects. Finally, if we take into consideration that the mental disturbance caused by schizophrenia results in a change in perception of reality by these individuals, we can infer an implication of such factors in language and, subsequently, the interference of such issues in the meaning construction processes in the discourse of patients diagnosed with schizophrenia

Linguagem, cognição e mundo: o livro do desassossego e a construção discursiva da realidade

This study analyzes the processes of meaning construction in the Livro do Desassossego, by semi-heteronym Bernardo Soares - Fernando Pessoa. We use theoretical grounds from an interface between Cognitive Linguistics and Textual Linguistics to observe how certain linguistic mechanisms build a reality that tells us of a time, a being and his conceptions of language and writing. We focus on description and explanation of procedures of categorization and referentiation accomplished, for example, through metaphor and metonymy. For the construction of the intended theoretical interface, we use analytical categories proposed and developed by the Socio-cognitive Approach of Language, Conceptual Metaphor Theory and Mental Space Theory. Armed with this theoretical background, we observed the dynamics of language in relation to its social, cultural and historical features, as well as the cognitive aspects that underlie it. We seek, therefore, encourage discussions about the functioning of language considering primarily the creative processes that allow us to organize and shape our experiences. We also try to provide an approximation of Linguistics, Literature and Philosophy, with a view to relations between language structure, cognitive activity and socio-cultural organization. From the results obtained, we found that a literary text attests, with a particular property, the mutual relations between language, cognition and culture, as indicates cognitive approach to language studies

Construções metafóricas de vida e morte: cognição, cultura e linguagem

En esta investigación, tratamos de poner de relieve los aspectos cognitivos y culturales que subyacen a las metáforas en el lenguaje. Partimos de la premisa de que nuestra comprensión a cerca del mundo se construye socio-cognitivamente, sendo la metáfora un elemento clave de esta construcción. Por lo tanto, tenemos la intención de mirar debajo de la teoría de la Teoría Cognitiva de la Metáfora, visto desde el análisis del poema Morte e Vida Severina, de João Cabral de Melo Neto, la metáfora de la vida y muerte, inferíveis en el corpus forma patrones discursivos, llamado por nosotros como el Construccionismo del Bloques. Estas metáforas se encuentran en el nivel conceptual de nuestro lenguaje, emitido por modelos cognitivos idealizados, y mostrar las relaciones entre la lengua, la cultura y la cognición. Vemos una red de integración que implica la metáfora primaria llamada, elaborado a partir de los esquemas y los dominios conceptuales y metáforas congruentes, con la participación de la noción de marco.

Linguagem e argumentação na produção escrita de vestibulandos

In this study, we analyzed the argumentative processes of written texts produced by UERN (Federal University of Rio Grande do Norte) vestibulandos : (students who apply for University Entrance Examinations in Brazil). It has as its corpus twenty compositions by such students. These compositions, collected in UFRN COMPERVE (Permanent Commission of vestibular examinations) and written in 2005 examination, were selected in a random way. The theoretical support is based on Perelman & Olbrechts-Tyteca (1999; 2002), Reboul (2004), Bakhtin (1992), Faraco (2003), Platão e Fiorim (2003) e Geraldi (1997), and other scholars. The work aimed to investigate how vestibulandos make use of argumentative techniques in order to construct their arguments in the vestibular examination. In the analysis of the corpus we considered that the used argumentative techniques, the relationship with the thesis, the sense effects students wanted to produce and the type of the required speech. It showed that in the, discourse construction of argumentative texts, students made use, with more frequency, of the following argumentative techniques: pragmatic arguments, arguments of the definition, comparison arguments, division arguments, example arguments, argument of the model and authority arguments as means to support their theses. However it was not carried out in a conventional way, reason why it leads us to believe that schools, as part of human activity, responsible for education and for the insert of learners in the literate world, have a fundamental role concerning the offer of conditions, so that, the teaching of Portuguese Language leads students to a systematic and explicit preparation of the knowledge, regarding the social and functions of the language, as well as of the strategies of the construction of argumentative texts. This can lead learners to develop communicative competence and to feel more confident when working with text production