Poles Engineering
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. SYNTHESIS METHODOLOGY FOR SIMPLIFIED ZVT TOPOLOGIES APPLIED TO BIDIRECTIONAL PWM POLES / METODOLOGIA DE SÍNTESE DE TOPOLOGIAS ZVT SIMPLIFICADAS APLICADAS A PÓLOS PWM BIDIRECIONAIS
Among the soft-switching techniques, the zero-voltage-transition (ZVT) technique has been accepted well by the industry due its attractive characteristics, such as simplicity, low losses in the auxiliary commutation circuit (ACC), operation with soft-switching for a wide load range, and closest operation to the PWM converter counterpart. In three-phase volta
Publicado em: 2009
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2. Propagação de ondas de ultra-som em prototipos de postes tubulares de concreto armado / Propagation of waves ultrasound in prototypes of reinforced of concrete tubular poles
Os postes de concreto apresentam, para os diferentes fabricantes, grande variabilidade em termos de qualidade e resistência inicial. Essas diferenças, provenientes de problemas durante a fabricação, têm se refletido na vida útil dos postes instalados na rede de distribuição de energia. Para ser aceito como fornecedor de poste de uma determinada conce
Publicado em: 2009
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3. Estudos qualitativos para elicitaÃÃo de requisitos: uma abordagem que integra anÃlise sÃcio-cultural e modelagem organizacional
It is known that to adequately obtain software requirements it is necessary to understand the human activities of the social and organizational contexts where the future systems will be used. Traditional ethnomethodological approaches of qualitative social studies provide a detailed description of human activities. However, the rethorical aspect these approa
Publicado em: 2008
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4. Uma avaliação experimental e numérica do efeito da rigidez geométrica na resposta dinâmica de estruturas esbeltas sujeitas à excitação de vento. / An experimental and numerical evaluation of the geometric stiffness effect on the dynamic response of slender structures under wind excitation.
Due to a politically and economically pragmatic decision, Brazil has chosen to intensely develop its cellular phone system, in order to bypass a stage of development. Once the decision has been taken, implementation was set in an explosive pace in the 1990s decade by installing tens of thousands of stations. As the electronic systems are usually more expensi
Publicado em: 2008
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5. Controles monovariáveis e multivariáveis aplicados a sistemas aeroespaciais fracamente ou fortemente acoplados / Monovariable and multivariable controls applied to weakly or strongly coupled aerospace systems
This work intends to study and compare two Classical (Single Input Single Output) Control design methods and three Modern (Multiple Input Multiple Output) Control design methods applied to weakly or heavily coupled aerospace systems. This work has as first application the Multi-Mission Platform - MMP currently under development at INPE. The models are develo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2006
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6. Estudos de um método para cálculo de ganhos da malha de controle de atitude de um lançador de satélites / Analytical method for computing the controller gains of a satellite launcher
In this work, the VLS (Satellite Launcher Vehicle) control gains are calculated applying a frozen poles technique for each 1-second interval, allowing that a linear time invariant analysis to be executed inside each time interval during all flight phases. The system control architecture is proportional-integral with derivative feedback, making the 3 gains (p
Publicado em: 2004
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7. TÉCNICAS AVAÇADAS DE INTEGRAÇÃO NUMÉRICA E PROGRAMAÇÃO ORIENTADA A OBJETOS APLICADAS A MÉTODOS DE ELEMENTOS DE CONTORNO / ADVANCED NUMERICAL INTEGRATION TECHNIQUES AND OBJECT ORIENTED PROGRAMMING APPLIED TO BOUNDARY ELEMENT METHODS
In Boundary Element Method analysis, the integration procedure is one of the most important tasks, since one has to deal with singular and quasi-singular integrals which introduce numerical errors in the results, if they are not evaluated adequately. In the last years, several researchers have suggested different techniques with the aim of handling the probl
Publicado em: 1998
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8. De sistemas a series estocasticas : aplicações a analise de vibrações no dominio do tempo
The present work describes the use of time domain identification techniques in the modal analysis of mechanical structures. The fundamentals of continuous system discretization and modal analysis are presented in a suitable maner for the study of dynamic systems in such a domain. Time domain identification models employed in other areas (electric engineering
Publicado em: 1992
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9. DESEMPENHO DE MODELOS RACIONAIS NA IDENTIFICAÇÃO DE ESPECTROS DE POTÊNCIA DE GRANDE RESOLUÇÃO / PERFORMANCE OF RATIONAL MODELS IN THE IDENTIFICATION OF HIGH RESOLUTION POWER SPECTRA
In many engineering problems, the power density spectra of random signals, with highly periodic components, have to be measured, very often this problem is reduced to the one of identifying the unknown power spectrum with a rational function. The identification techniques differ from each other only by the statistical criteria of the procedures used to estim
Publicado em: 1973