ELEMENTS ON NUMERICAL AND EXPERIMENTAL STUDY OF POWER BUS MANUFACTURED IN COPPER LAMINATES

This paper presents elements on numerical and experimental study of power buses manufactured on copper laminates aiming to assist electronic projects development which may use printed circuit board, also contributing to improve layouts, manufacturing processes and production costs reduction. The quantitative approach was used in bibliographical, documentary and a prototype was developed for this purpose. The results obtained from the tests suggest that the type of material proposed in this study, when subjected to an intense electric current flow presents performance suiting the intended purpose. In conclusion, we assume that the use of copper laminates in the manufacture of power buses allows the development of new configurations in electrical and / or electronic projects which leads to the manufacture process of assembly be similar to the world-wide trend

Graphic Interface Applied to Automated System to Manage the use of Tools in Machine

The processing industry has to find ways to reduce manufacturing costs, as a way to survive in the market with increasing competition. This competition has become increasingly driven by globalization, that is, an industry has to share the consumer market with other industries that are installed worldwide. One of the possible ways to reduce manufacturing costs is related to the efficient use of basic inputs. Among the main inputs used in the manufacture, some are specifically related to the tools that are installed on machines such as lathes, grinding machines, presses and others. Typically, the tools developed by the industry in the process engineering sector have dedicated characteristics that must be maintained to perform the appropriate transformation of the product being manufactured. The preservation of these characteristics is linked mainly with the specified service life for the use of each tool, in order to make the substitution before the product is affected by non conformities arising from the manufacturing process. The tool replacement at the right time becomes essential, but to perform this task should be considered aspects related to the early and late replacement, both of which can lead to increased costs for the purchase of tools or rework parts produced with different characteristics what was envisaged in the specification. In this context, this paper proposes a graphical interface to be integrated into the physical architecture of the automated system that makes managing the use of tools for industrial eccentric press. All virtual components designed for the windows of the graphical interface are significant and related to the procedures set out to make the replacement of each of the press tool. The validation of the functionality of the interface is obtained by means of tests on the prototype that adopts the basic elements provided in said architecture. The positive results observed in practical tests suggest that graphical interface is appropriat

Automation proposal applied to Trolleybus current collector

This work presents the main steps performed in the development of a system proposal to automate the operation of the current collector that is used in trolleybuses, aiming, mainly, to continuously monitor the contact with the overhead electric wire and also to provide the coordinated movement of collection in situations of circuit disconnection, in order to reduce the incident of collisions between the collector and the mechanical structure of this wire. These improvements are aimed at contributing to the quality of the public transport service, a factor that corroborates the expansion of new routes of mass public transport that use renewable sources of energy, replacing the traditional vehicles powered by combustion with fossil fuel. The method employed and the details contained in this proposal allow the use of an expressive o part of the traditional design of the current collector, being suggested the substitution of parts, adequacy of the mechanical structure related to the fixation points of the components, installation of sensor elements, actuating elements, and programmable controller with dedicated algorithm for this application. The positive results observed in the computational evaluations of the electronic and pneumatic circuit, which are managed by a dedicated control algorithm for these systems, suggest that the resources and components proposed in this work when effectively integrated in trolleybuses will be able to meet the purposes for which they are intended

Applied algorithm in the liner inspection of solid rocket motors

Made available in DSpace on 2019-09-12T16:53:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2018Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)In rocket motors, the bonding between the solid propellant and thermal insulation is accomplished by a thin adhesive layer, known as liner. The liner application method involves a complex sequence of tasks, which includes in its fmal stage, the surface integrity inspection. Nowadays in Brazil, an expert carries out a thorough visual inspection to detect defects on the liner surface that may compromise the propellant interface bonding. Therefore, this paper proposes an algorithm that uses the photometric stereo technique and the K-nearest neighbor (KNN) classifier to assist the expert in the surface inspection. Photometric stereo allows the surface information recovery of the test images, while the KNN method enables image pixels classification into two classes: non-defect and defect. Tests performed on a computer vision based prototype validate the algorithm. The positive results suggest that the algorithm is feasible and when implemented in a real scenario, will be able to help the expert in detecting defective areas on the liner surface. (C) 2017 Elsevier Ltd. All rights reserved.[Simoes Hoffmann, Luiz Felipe; Parquet Bizarria, Francisco Carlos] Aeronant Inst Technol, Space Sci & Technol Program, BR-12228900 Sao Jose Dos Campos, Brazil[Parquet Bizarria, Jose Walter] Universidade de Taubaté (Unitau), Dept Informat, BR-12020270 Taubate, Brazi

Arquitetura dedicada para realizar testes operacionais em módulos fotovoltaicos

A atual situação estabelecida pela escassez de recursos naturais não renováveis para a geração de energia, associada com a tendência mundial em buscar o desenvolvimento sustentável, impulsionaram a ascensão e busca por fontes e recursos energéticos alternativos. Alinhada com essa tendência se destaca a energia solar, a qual é produzida a partir da radiação solar e caracterizada como uma fonte profusa, renovável, sustentável e limpa. Essa pode ser utilizada em processo térmico para aquecimento e/ou em sistema do tipo solar fotovoltaico para geração de eletricidade. Decorrente das vantagens que estão relacionadas com a utilização desses sistemas é possível expandir as aplicações nos diversos segmentos da sociedade, sendo que a implantação de sistema para gerar eletricidade com o uso dessa tecnologia requer a instalação de um ou mais arranjos de módulos fotovoltaicos. Durante a fase de instalação em campo, esses módulos podem ser submetidos aos diferentes tipos de solicitações mecânicas, as quais possuem o potencial e a capacidade de causar desconformidades no seu funcionamento, estabelecendo uma situação na qual é necessário realizar retrabalhos, o que impacta em custo, tempo e qualidade. Para minimizar as consequências dessas desconformidades, testes operacionais podem ser realizados nesses módulos antes de sua instalação em campo, a fim de verificar a integridade dos mesmos. Nesse contexto, este trabalho propõe uma arquitetura para sistema realizar automaticamente os testes operacionais em módulos fotovoltaicos antes da fase de instalação em campo. A validação dessa arquitetura é realizada por meio de testes práticos em protótipo desenvolvido para esse fim. Os resultados obtidos nesses testes foram positivos, sugerindo que a arquitetura proposta é adequada para a finalidade a qual se destina

Technique applied in electrical power distribution for Satellite Launch Vehicle

The Satellite Launch Vehicle electrical network, which is currently being developed in Brazil, is sub-divided for analysis in the following parts: Service Electrical Network, Controlling Electrical Network, Safety Electrical Network and Telemetry Electrical Network. During the pre-launching and launching phases, these electrical networks are associated electrically and mechanically to the structure of the vehicle. In order to succeed in the integration of these electrical networks it is necessary to employ techniques of electrical power distribution, which are proper to Launch Vehicle systems. This work presents the most important techniques to be considered in the characterization of the electrical power supply applied to Launch Vehicle systems. Such techniques are primarily designed to allow the electrical networks, when submitted to the single-phase fault to ground, to be able of keeping the power supply to the loads

VSB-30 sounding rocket: history of flight performance

The VSB-30 vehicle is a two-stage, unguided, rail launched sounding rocket, consisting of two solid propellant motors, payload, with recovery and service system. By the end of 2010, ten vehicles had already been launched, three from Brazil (Alcântara) and seven from Sweden (Esrange). The objective of this paper is to give an overview of the main characteristics of the first ten flights of the VSB-30, with emphasis on performance and trajectory data. The circular 3Ï dispersion area for payload impact point has around 50 km of radius. In most launchings of such vehicle, the impact of the payload fell within 2 sigma. This provides the possibility for further studies to decrease the area of dispersion from the impact point