Made available in DSpace on 2016-12-12T17:38:37Z (GMT). No. of bitstreams: 1 ILTON ANCELMO PEREIRA JUNIOR.pdf: 6854626 bytes, checksum: 8fdf9667f4e840b4dc298f1e9605bf2d (MD5) Previous issue date: 2011-02-15 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This master thesis introduces a study about the influence of frequency variation induced in the magnetic properties of materials. Experiments are accomplished in the Epstein frame or Epstein square, the measurements are being acquired through a data acquisition system PC-based, which is handled through a software developed in LabVIEW. As results, we have the magnetization curve, hysteresis loop and specific losses for several preset frequencies, and the harmonic distortion evaluation in current and voltage signals during the trial. The end of the essay presents a methodology able to accomplish the harmonics cancellation generated by the steel saturation, applying a voltage source having adjustable harmonic voltages. / Esta dissertação apresenta um estudo sobre a influência da variação da frequência nas propriedades magnéticas dos materiais. Os ensaios são realizados em quadro de Epstein, sendo as medições obtidas através de um sistema de aquisição de dados baseado em PC, o qual é controlado por um software desenvolvido em LabVIEW. Como resultados têm-se a curva de magnetização, a curva de histerese e as perdas específicas para diversas frequências pré-selecionadas, sendo avaliadas as distorções harmônicas de tensão e de corrente, durante os ensaios. Ao final é apresentada uma metodologia capaz de realizar o cancelamento das harmônicas geradas pela saturação do aço, através de uma fonte de tensão com ajuste de harmônicos.

Made available in DSpace on 2014-12-17T14:55:57Z (GMT). No. of bitstreams: 1 FranciscoGFJ.pdf: 2262425 bytes, checksum: 03d70ce4ca2d284516ec0c9c15922fbf (MD5) Previous issue date: 2006-02-17 / The present work has as objective to present a method of project and implementation of controllers PID, based on industrial instrumentation. An automatic system of auto-tunning of controllers PID will be presented, for systems of first and second order. The software presented in this work is applied in controlled plants by PID controllers implemented in a CLP. Software is applied to make the auto-tunning of the parameters of controller PID of plants that need this tunning. Software presents two stages, the first one is the stage of identification of the system using the least square recursive algorithm and the second is the stage of project of the parameters of controller PID using the root locus algorithm. An important fact of this work is the use of industrial instrumentation for the accomplishment of the experiments. The experiments had been carried through in controlled real plants for controllers PID implemented in the CLP. Thus has not only one resulted obtained with theoreticians experiments made with computational programs, and yes resulted obtained of real systems. The experiments had shown good results gotten with developed software / O presente trabalho tem como objetivo apresentar um m?todo de projeto e implementa??o de controladores PID, baseado em instrumenta??o industrial. Ser? apresentado um sistema autom?tico de re-sintonia de controladores PID, para sistemas de primeira e segunda ordem. O software apresentado neste trabalho ? aplicado em plantas controladas por controladores PID implementados num CLP. O software ? aplicado para fazer a auto-sintonia dos par?metros do controlador PID de plantas que necessitem desta sintonia. O software apresenta duas etapas, a primeira ? a etapa de identifica??o do sistema utilizando o algoritmo dos m?nimos quadrados recursivos e a segunda ? a etapa de projeto dos par?metros do controlador PID utilizando o algoritmo do m?todo do lugar das ra?zes. Um fato importante deste trabalho ? a utiliza??o de instrumenta??o industrial para a realiza??o dos experimentos. Os experimentos foram realizados em plantas reais controladas por controladores PID implementados em um CLP. Assim n?o se tem apenas resultados te?ricos obtidos de experimentos feitos com programas computacionais, e sim resultados obtidos de sistemas reais. Os experimentos mostraram bons resultados obtidos com o software desenvolvido

Made available in DSpace on 2014-12-17T14:56:06Z (GMT). No. of bitstreams: 1 RodrigoBS.pdf: 821976 bytes, checksum: 45f7062b292e641f0f7e595b2b356d60 (MD5) Previous issue date: 2005-02-04 / Petr?leo Brasileiro SA - PETROBRAS / The using of supervision systems has become more and more essential in accessing, managing and obtaining data of industrial processes, because of constant and frequent developments in industrial automation. These supervisory systems (SCADA) have been widely used in many industrial environments to store process data and to control the processes in accordance with some adopted strategy. The SCADA s control hardware is the set of equipments that execute this work. The SCADA s supervision software accesses process data through the control hardware and shows them to the users. Currently, many industrial systems adopt supervision softwares developed by the same manufacturer of the control hardware. Usually, these softwares cannot be used with other equipments made by distinct manufacturers. This work proposes an approach for developing supervisory systems able to access process information through different control hardwares. An architecture for supervisory systems is first defined, in order to guarantee efficiency in communication and data exchange. Then, the architecture is applied in a supervisory system to monitor oil wells that use distinct control hardwares. The implementation was modeled and verified by using the formal method of the Petri networks. Finally, experimental results are presented to demonstrate the applicability of the proposed solution / A utiliza??o de sistemas de supervis?o tem se tornado cada vez mais essencial ao acesso, gerenciamento e obten??o de dados dos processos industriais, devido ao constante e frequente desenvolvimento da automa??o industrial. Estes sistemas supervis?rios (SCADA) t?m sido amplamente utilizados em diversos ambientes industriais para armazenar dados do processo e control?-lo de acordo com alguma estrat?gia adotada. O hardware de controle de um sistema SCADA ? o conjunto de equipamentos respons?veis pela execu??o desta tarefa. O software de supervis?o SCADA acessa os dados dos processos atrav?s do hardware de controle e torna-os dispon?veis para os usu?rios. Atualmente, muitos sistemas de automa??o industrial utilizam softwares de supervis?o desenvolvidos pelo mesmo fabricante do hardware de controle. Normalmente, estes softwares n?o podem ser usados com equipamentos de controle de outros fabricantes. Este trabalho prop?e uma metodologia de desenvolvimento de sistemas de supervis?o capaz de acessar informa??es dos processos atrav?s de diferentes equipamentos de controle. Inicialmente, defini-se uma arquitetura para sistemas supervis?rios que garanta comunica??o e troca de dados eficientes. Em seguida, a arquitetura ? aplicada em um sistema de supervis?o de po?os de petr?leo que utilizam diferentes equipamentos de controle. A implementa??o foi modelada utilizando o m?todo formal de redes de Petri. Os resultados s?o apresentados para demonstrar a aplicabilidade da solu??o proposta

É apresentado um sistema para redução do tempo de calibração e compensação de sensores piezoresistivos de pressão para aplicações de automação e controle com características de alto desempenho, com compensação de diversas fontes de erro, especialmente, compensação de não-linearidade e influência da temperatura na medição, baseado em uma concepção que privilegia a precisão e exatidão da medida, a qualidade e a confiabilidade. O sistema projetado permite a automação do processo de calibração e compensação térmica de transmissores de pressão por meio de um sistema de medição e programação múltiplo, que possibilita a aquisição dos sinais em um único computador para até 16 transmissores simultâneos, aperfeiçoando o tempo total do processo, permitindo efetuar essa operação para uma produção a nível industrial. O tempo total do processo de compensação e calibração de mais de um transmissor foi reduzido em aproximadamente 6 horas por cada transmissor adicional. No caso de 16 transmissores o sistema sem multiplexação demoraria 114 horas enquanto o sistema com multiplexação demora 24 horas para efetuar o processo completo, representando uma diminuição de 78,9% no tempo total do processo. Os transmissores calibrados e compensados usando o sistema de multiplexação apresentam TEB menor que 0,1% FS, mostrando que o sistema projetado permite que os transmissores de pressão produzidos cumpram com características de desempenho iguais às atingidas pelo sistema de compensação e calibração simples. / Is presented a system for time optimization of the calibration and compensation process of piezoresistive pressure sensors for automation and control applications with high performance characteristics, with compensation of several error sources, specially, compensation of temperature dependencies and nonlinearity, based in an approach that privileges accuracy and precision in the measurements, quality and reliability. The designed system enables the automation of the calibration process and temperature compensation of pressure transmitters through a measuring and multiple programming system that enables the acquisition of signals on a single computer for up to 16 simultaneous transmitters, improving the overall process time, allowing to perform this operation for a production of industrial level. The total process time of compensation and calibration of more than one transmitter has been reduced by about 6 hours for each additional transmitter. In the case of 16 transmitters, the system without multiplexing would take 114 hours while the system with multiplexing takes 24 hours to make the entire process, representing a decrease of 78.9% in the total process time. The transmitters calibrated and compensated using the multiplexing system have TEB less than 0.1% FS, showing that the designed system allows pressure transmitters produced comply with performance characteristics equal to those achieved by the original compensation and calibration system.

Having well-trained operators is a crucial need for Volvo Group Truck Operations (GTO). Mistakes from the factory staff may cause the production line to stop, and lead to economic losses. For this reason, Volvo GTO has decided to investigate the possibility of creating an emulation model from the production line and using it to train operators and maintenance personnel. The aim of this thesis is to develop an Operator Training Station (OTS) for the OP035 of the Volvo GTO Production Line 6. In the first part, a literature research was conducted, from which the authors gained insight into related fields such as emulation, virtual environments, and operator training. After that, an emulation model of theOP035 was created using some hardware from the factory. The real PLC program was analyzed and then modified in order to implement it to the emulation model. Then, communications were established between the different parts; emulation model and PLC program. Finally, a research of the common failures and problems of the production line was carried out, with the aim of being able to reproduce them in the Operator Training Station. Once the OTS was implemented, several tests had undergone to validate its behavior. These experiments verified that the emulation model was an accurate representation of the real system and validated its appropriateness for the operator training application

The diploma thesis deals with the design of a workplace with robots designed for spot welding of wire reinforcement of the car seat. After analyzing and description of the given task, the workplace concept is chosen based on the input parameters. Subsequently, sub-systems of the production cell are designed and selected for this concept. For example the design of clamping fixtures, rotary table, input and output storage magazines or the selection of welding guns and robots are solved. The workplace is designed to ensure operator safety and protection. The production cycle of the designed workplace is simulated in Siemens Process Simulate to verify functionality and required productivity of the production line. Technical and economic evaluation of the proposed solution is also included in this diploma thesis.

This diploma thesis deals with the design of a robotic workplace for deburring of a given part. The robot's task is to remove the machined part from the production machine, create a blank workpiece ready for machining, and finally deburr the the machined part. There are several proposals for the layout of the robotic cell, as well as the design of the end effector, the input tray for semi-finished products and a stand with tools for deburring. Subsequently, a simulation model of the designed robotic cell is created in the Siemens Process Simulate software. Using RSC modules, the exact resulting cell clock is determined. The whole process of creating a simulation model is detaily described. At the end of this thesis is an economic evaluation of the proposed solution.

This master’s thesis deals with the design of a robotic cell for the automation of woodworking machine tending. The task of the robot is to manipulate with the specified laminated chipboards of various sizes, before and after machining. The boards are brought to the cell on pallets in three possible placement variants. After a brief research part, conceptual designs of cell layout were created. The optimal and further elaborated design came as a result of selected evaluation criteria. The next part of the thesis consists of designs and selection processes of individual components. These were later used to create a simulation model in Tecnomatix Process Simulate software (Siemens), that helped to verify the functionality of the cell layout, design the control logic and acquire the time of the manipulation cycle used for informative calculation of annual production. In the end, the final design was evaluated from an economic point of view with an emphasis on the return of the initial investment.

The master thesis describes the design and digital commissioning of a robotic production system for 3D concrete printing. The theoretical part of the thesis includes an analysis of the current state of knowledge in the field of 3D printing in industrial automation. It also includes a detailed system analysis of the problem, in which the requirements and elements of the production system are specified. In the applied part of the thesis, a 3D model of the workplace was created and a simulation of the entire production process and digital commissioning of the system were performed using the ABB RobotStudio software. The output of the of the application part of the thesis is the design is the design of the workplace with a debugged control program ready for use in real operation.

Electro Hydrostatic Actuators (EHA) are emerging as a viable option for industrial machine builders as the design combines the best of both electro-mechanical and electro-hydraulic technologies. The EHA is a highly integrated, compact alternative to traditional hydraulic solutions. Automation engineers moving toward electro-mechanical actuation in pursuit of energy efficiency and environmental cleanliness, will find an EHA an attractive option for high force density actuators. This paper will address the factors to consider when assessing an industrial machine’s application suitability for this latest innovation in actuation. It describes principal base circuits, a concept for EHA building blocks and a realized pilot application as well as challenges on actuator and components level.