Acceleration Techniques
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Structural damage detection using time series analysis and piezoelectries actuators and sensors / Detecção de danos estruturais usando analise de series temporais e atuadores e sensores piezeletricos
This work proposes a novel approach to detect and locate incipient damage in structures by using only acceleration responses and coupled piezoelectric actuators and sensors. Though the major focus in smart damage detection is given by on the monitoring of the electrical impedance in the frequency domain, the current contribution applies a novel technique bas
Publicado em: 2008
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14. SASSI 2000 AND ACS SASSI 2.2 OVERVIEW ON STRUCTURESOIL-STRUCTURE INTERACTION ANALYSIS / PANORAMA DA INTERAÇÃO ESTRUTURA-SOLO-ESTRUTURA SEGUNDO O SASSI 2000 E SUA PROJEÇÃO NO ACS SASSI 2.2
Situations involving structure-soil-structure interaction using SASSI 2000 and ACS SASSI protocols are concerned. Initially, techniques of elastic plane waves propagation in solids are used to understand SASSI free-field solution algorithm. Then, in SASSI scenery, some relevant properties of the model are varied and their influence on the interaction is anal
Publicado em: 2008
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15. Accelerating the Levenberg-Marquardt method for the minimization of the square of functions with box constraints / Acelerando o metodo de Levenberg-Marquardt para a minimização da soma de quadrados de funções com restrições de caixa
In this work, we present an active set algorithm for minimizing the sum of squares of smooth functions, with box constraints. The algorithm is highly inspired in the work of Birgin and Mart´inez [4]. The differences are concentrated on the chosen search direction and on the use of an acceleration technique to update the step. At each iteration, we define an
Publicado em: 2008
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16. Craftwork in the and for the market: the nets of production and commercialization of the craftworks of the Hippie and Cerrado markets in Goiânia (GO) / ARTESANATO NO E PARA O MERCADO: AS REDES DE PRODUÇÃO E COMERCIALIZAÇÃO DOS ARTESANATOS DAS FEIRAS HIPPIE E DO CERRADO DE GOIÂNIA - GO
In these work is considered that Craftworks are pieces made with manual techniques that presuppose lack or a few utilization of industrial machines help. The consumptions acceleration provided by the globalization, the constant technologys breakthrough, the cultural industry and the tourism are some of the factors that alter the craftwork in so far as that a
Publicado em: 2008
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17. Metodologias para a determinação das propriedades de impacto de baixa energia de laminados metal-fibra / Methodologies to determine low-energy impact properties of fiber-metal laminates
Applications of hybrid fiber-metal laminates include, besides aeronautical industry, the automotive and naval industries. Unlike aeronautical field, impact research activities in the former areas of mobility industry are frequently limited by available laboratory equipment, so that it would be desirable to develop low-cost procedures to determine impact resi
Publicado em: 2008
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18. Uma proposta de ferramenta para controle de qualidade em linha de produÃÃo e montagem de cÃmbios automotivos utilizando filtragem adaptativa / A proposal of tool for automotive gearbox quality control in production and assembly line using adaptive filtering
Normally, automotive gearbox quality control in assembly line is made in subjective manner by specialists. The human ear, despite being a highly sensitive tool and widely used in quality control is also sensitive to emotional and environmental problems (back noises), besides not giving measurable values. In order to solve this problem, the traditional techni
Publicado em: 2007
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19. A construção da usina hidrelétrica Barra Bonita e a relação homem-natureza: vozes dissonantes, interesses contraditórios (1940-1970)
This doctoral theses tried to discuss and questionate the technologic instrumental role at Barra Bonitas power plant construction, at a space in the Tietes River, in the central Region of São Paulo, and the social, economic, environmental and cultural impact caused by its lake mainly to the brickmaker-ceramic population from Barra Bonita and around it. This
Publicado em: 2007
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20. Estudo da convergência no método de elementos finitos aplicado a dispositivos eletromagnéticos não lineares. / Survey on the convergence of non-linear finite element method applied to electromagnetic devices in two-dimension.
This work presents a study on the convergence of non-linear finite analysis applied to the modeling of electromagnetic devices with plane symmetry. Three aspects have been thoroughly investigated which have influence on the convergence performance, namely: the relaxation factor in the Newton-Raphson algorithm, the model of the magnetization curve and the cho
Publicado em: 2007
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21. Controle de vibrações em edifícios submetidos à ação de cargas dinâmicas utilizando amortecedor de massa sintonizando na forma de pêndulo / Vibration control of structures subjected to dynamic loads using tuned pendulum-shaped mass dampers
The ongoing progress of structural analyses and dimensioning, in addition to the continuous advancements in building techniques and material, has made it possible to build taller and more slender structures every day. These structures are also more vulnerable to excessive vibrations caused by dynamic loads like earthquakes, winds, waves, intense traffic, and
Publicado em: 2007
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22. Um novo mÃtodo para investigar cinÃticas de polimerizaÃÃo baseado em RMN
Nowadays, research and development of polymer synthesis procedures are part of a technological branch which is quit intensive. This development depends, partially, on the ability of following and understanding the polymerization kinetics of these materials. For instance, mechanic stiffness of a polymer depends on size of its chains. On the other hand, for ch
Publicado em: 2007
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23. Aspectos ecológicos e econômicos do plantio de Pinus elliottii Engelm var. elliottii como facilitadora da restauração de mata ripária em região de Cerrado (Assis, SP, Brasil) / Exotic species in forest restoration: ecological and economical aspects of using Pinus elliottii Engelm var. elliottii as pioneer in Cerrado region, Assis, SP, Brazil
Among the obstacles to the native forests restoration in Brazil we find the high costs of planting high diversity of native trees. Searching for reduction of costs and vegetation recovery acceleration, the use of a fast growing exotic species (Pinus elliottii var. elliottii) as pioneer was tested in a riparian area in the cerrado domain, at Assis municipalit
Publicado em: 2007
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24. Advanced turbulence modelling for complex aerospace applications.
The objective of the present research work consists in studying complex aerodynamic flows about typical aerospace configuration, in which turbulence effects play a fundamental role. Such study is performed with an available computational tool that is being developed at CTA/IAE. This is a finite-volume code for unstructured 3-D meshes that solves the compress
Publicado em: 2007