Parametric Design
Mostrando 61-72 de 119 artigos, teses e dissertações.
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61. DIVISORES DE FREQÜÊNCIA POR DOIS PARAMÉTRICOS BALANCEADOS A PHEMT PARA RECEPTORES DE DEFESA ELETRÔNICA / PHEMT BALANCED PARAMETRIC FREQUENCY DIVIDER BY TWO FOR ELECTRONIC DEFENSE RECEIVERS
This work assesses the development of PHEMT balanced parametric frequency dividers by two, intended for application as frequency converters on Electronic Defense digital receivers. The main characteristics of these devices are design simplicity, reduced number of components, possibility of integration in MMIC, phase coherence, wide bandwidth, very good pulse
Publicado em: 2009
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62. Controle de estruturas flexíveis levando em conta o projeto simultâneo da estrutura e do controlador / Flexible structures control considering the simultaneous design of structure and controller
This work proposes techniques for the design of smart structures, that is, those structures that consider simultaneously the design of some of its parameters and the design of the controller. This type of approach allows to find a global design that will result either in a structure without the active controller requirement (i.e. a passive design) or the opt
Publicado em: 2009
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63. Proposta de procedimentos de desenvolvimento de suportes aplicados em chassi veicular. / Proposal of bracklets development procedures applied in vehicle chassis.
The objective of this work is to achieve a procedure for structural design optimized metal brackets used in the chassis of commercial vehicles, which have in the most of the cases limitations related to product design and manufacturing. Was carried out a bibliographic review of structural optimization main methods, covering problems and solutions related to
Publicado em: 2009
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64. STUDY, CONTROL AND IMPLEMENTATION OF THE PFC BOOST CONVERTER OPERATING IN MIXED CONDUCTION MODE / ESTUDO, CONTROLE E IMPLEMENTAÇÃO DO CONVERSOR BOOST PFC OPERANDO NO MODO DE CONDUÇÃO MISTA
This Master Thesis presents the study and proposes a digital control system applied to the PFC boost converter operating in mixed conduction mode. The motivation to this subject, a bibliographic review of the existing current control techniques and the objectives of this work are presented in the first chapter. The control system is composed of a current loo
Publicado em: 2009
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65. Reynolds number effect on the heat transfer mechanisms in aircraft hot air anti-ice system.
The primary means of preventing ice formation on wings and engine inlets for modern commercial transport aircraft is by extracting hot air from the compressor and blowing it on the inside surface of the leading edge through small holes drilled in the so-called piccolo tube system. A critical aspect in the design of such system is the prediction of heat trans
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2008
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66. Soundscape design through evolutionary engines
Two implementations of an Evolutionary Sound Synthesis method using the Interaural Time Difference (ITD) and psychoacoustic descriptors are presented here as a way to develop criteria for fitness evaluation. We also explore a relationship between adaptive sound evolution and three soundscape characteristics: key-sounds, key-signals and sound-marks. Sonic Loc
Journal of the Brazilian Computer Society. Publicado em: 2008-09
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67. Non-parametric regression with correlated errors using wavelets / Regressão não-paramétrica com erros correlacionados via ondaletas.
In this thesis, rates of convergence to zero are obtained for the estimation risk, for non-parametric regression using wavelets, when the errors are correlated. Four non-parametric regression methods using wavelets, with un-equally spaced design are studied in the presence of correlated errors, that come from stochastic processes. Conditions on the errors an
Publicado em: 2008
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68. A Influência da parametrização dos softwares CADD arquiteturais no processo de projetação arquietônica
Answering to the current market and construction industry agents (professionals, clients, businessmen, etc.) demands, several authors and software salesmen have been suggesting the optimization (of time, cost, quality and integration) of the current architectural project process, from the use of Architectural Parametric CADD (Computer Aided Design and Drafti
Publicado em: 2008
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69. Disc brake noise analysis using instability of complex eigenvalue / Instabilidade de freios a disco por analise de autovalor complexo
To understand, model and mitigate disc brake noise is still one of the greatest challenges for the automotive industry. It is substantially important for manufacturers and suppliers to predict the disc brake noise in a design phase. Squeal is a brake noise in the 1-15 kHz frequency range, and can be defined as a self-excited friction problem, which can gener
Publicado em: 2008
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70. Estudo de tecnicas de controle H-infinito para estruturas flexiveis com intercentezas / A study on H-inifinity control techniques for uncertain flexible structures
This dissertation deals with modern techniques from the Robust H? Control of Linear Dynamic Systems. By this it is meant that the results from linear control systems theory are used as mathemathical tools when considering several kinds of uncertainty on the models. These models are mostly of flexible structures and the design methods are implemented using so
Publicado em: 2008
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71. Estudo comparativo das aproximações baseadas no método de decomposição paramétrico para avaliar redes de filas de manufatura utilizando planejamento de experimentos / A comparative study of approximations based on the parametric decomposition method to evaluate manufacturing queueing networks using designing of experiments
This is a study of approximations based on parametric decomposition methods used in open queueing networks for modeling discrete job-shop manufacturing systems. These approximations play an important role in evaluating the performance of productive systems and have proved effective in many situations. Besides, these approximations are relatively easy to appl
Publicado em: 2008
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72. Controlador adaptativo backstepping a estrutura variável
In this work, a Variable Structure Adaptive Backstepping Controller (VS-ABC) for monovariable, linear time invariant plants with relative degree one is presented. Instead of traditional integral adaptive laws for estimating the plant parameters, switching laws are used to increase robustness to parametric uncertainties and disturbances, as well as, to improv
Publicado em: 2008