Traction Control
Mostrando 13-24 de 48 artigos, teses e dissertações.
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13. Proposta de integração do sistema de automação de subestações retificadoras do sistema metrô-ferroviário brasileiro. / Proposal for the integrated automation of the brazilian subway system rectifier substations.
This dissertation there presents a proposal for the integrated automation of the Brazilian subway system rectifier substations, supported on the gains of reliability which may be obtained in case it is implemented, and in the improvement of the efficiency of operation of the system open to question. The inquiry was supporting in the necessity of paying atten
Publicado em: 2010
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14. IDENTIFICATION OF THE BEHAVIOR OF TEMPERATURE MAIN RECTIFIER OF A DIESEL-ELECTRIC LOCOMOTIVE / IDENTIFICAÇÃO DO COMPORTAMENTO DA TEMPERATURA DO RETIFICADOR PRINCIPAL DE UMA LOCOMOTIVA DIESEL-ELÉTRICA
In this dissertation, we explore the application of the Theory of System Identification to develop a mathematical model that represents the behavior of the electrical current rectifier used to power the traction motors of a locomotive diesel-electric, based on mathematical manipulation of its temperature data. It was developed an ARX model and, using the aid
Publicado em: 2010
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15. Vein graft fulfilled with fat in peripheral nerve repair: a new proposal / Enxerto venoso preenchido com gordura no reparo de nervo periférico: uma nova proposta
With technology advance and the resultant production of more sophisticated equipment, microsurgery has been obtaining more attention in the experimental investigation field referred to peripheral nerves repair. It is know that in case of simple nerve section, without tissue loss, the end-to-side-neurorraphy is the most recommended technique. However, in each
Publicado em: 2010
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16. EFEITOS NAS PROPRIEDADES MECÂNICAS, ELÁSTICAS E DE DEFORMAÇÃO EM CONCRETOS COM ALTOS TEORES DE ESCÓRIA E CINZA VOLANTE. / EFFECTS ON MECHANICAL, ELASTIC AND DEFORMATION PROPERTIES ON CONCRETE WITH HIGH LEVELS OF SLAG AND FLY ASH.
The use of byproducts and industrial waste as pozzolanic, is an alternative to achieve the sustainability, economy and durability in concrete structures. This survey has as its purpose to analyze the effect on mechanical, elastic and deformation properties on concrete with a high level of granulated slag from blast furnace and fly ash in place of Portland bu
Publicado em: 2009
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17. Evaluation of shrinkage and creep of self-compacting concrete for application in precast elements / Avaliação de retração e fluencias do concreto auto-adensavel para aplicação em elementos pre-moldados
This project analyzed, theoretically and experimentally, the mechanical and rheological behavior of the selfcompacting concrete (C.A.A.), specially its features according to slow deformation, shrinkage and creep, and its applicability in precast elements. Two compositions of concrete of different classes of resistance were developed, 35 MPa and 55 MPa. In th
Publicado em: 2009
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18. In vitro evaluation of the resistance to traction of different fiber-glass posts used in two protocols for fragile root rehabilitation, with or without composite resin reinforcement / Avaliação, in vitro, da resistência à tração de diferentes pinos de fibra de vidro utilizados em dois protocolos para reabilitação de raízes fragilizadas, com e sem reforço de resina composta
This study evaluated in vitro the resistance of roots to traction of different posts of glass-fiber used in two register to rehabilitation of weakened roots with or out reinforcement of composite resin. Thirty canines had their crowns sectioned and radicular canals endodontically treated. The roots were included in blocks of resin, having exception in 2mm ce
Publicado em: 2008
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19. Compósito de hidroxiapatita e lignina como promotor de osseointegração entre implante metálico e tecido ósseo: estudo experimental / Hydroxyapatite-lignin composite as a metallic implant-bone tissue osseointegration improver: experimental study
This study aimed to evaluate the composite made of synthetic hydroxyapatite associated with lignin, as a promoter of integration between a metal implant (intra-medullar pin, Schanz) and bone tissue. Twenty New Zealand rabbits were used, each of them had both tibia operated: the left one was treated with the composite and the right was not treated, serving as
Publicado em: 2008
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20. Effects of physical exercise on the sleep of the patients with chronic primary insomnia. / Efeitos do exercício físico no sono de pacientes com insônia crônica primária
Some evidences suggest that physical exercise can improve sleep quality of insomniac patients. The aim of this study was to evaluate and compare the acute effect of three modalities of physical exercise in anxiety state and in the sleep quality in insomnia patients. Thirty-six patients (8 men and 28 women) with primary chronic insomnia (mean age 44,4 8) were
Publicado em: 2008
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21. Low-cost PWM speed controller for an electric mini-baja type vehicle
This paperwork presents a Pulse Width Modulation (PWM) speed controller for an electric mini-baja-type car. A battery-fed 1-kW three-phase induction motor provides the electric vehicle traction. The open-loop speed control is implemented with an equal voltage/frequency ratio, in order to maintain a constant amount of torque on all velocities. The PWM is impl
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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22. TRACTION CONTROL TO MOBILE ROBOTIC SYSTEMS IN ROUGH TERRAIN / MODELAGEM DE SISTEMAS ROBÓTICOS MÓVEIS PARA CONTROLE DE TRAÇÃO EM TERRENOS ACIDENTADOS
Abstract Silva, Alexandre F. Barral Silva; Meggiolaro, Marco Antonio. Traction Control to Mobile Robotic Systems in Rough Terrain. Rio de Janeiro, 2004. 194 p. MSc. Thesis - Departamento de Engenharia Mecânica, Pontifícia Universidade Católica do Rio de Janeiro. In rough terrain it is critical for mobile robots to maintain adequate wheel traction, because
Publicado em: 2007
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23. Desenvolvimento de um sistema de controle para a órtese funcional de mão da UFMG
Hand orthosis is an external device applied or joined to the hand and to the wrist to improve its function controlling the movement, supplying the objects sustentation, correcting flexible deformities and hindering the progress of fixed deformities. This work aimed to develop the grip force control of a hand orthosis developed in the Bioengineering Laborator
Publicado em: 2007
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24. TIP OVER AND SLIPPAGE CONTROL OF MOBILE ROBOTIC SYSTEMS OVER ROUGH TERRAIN / CONTROLE DE CAPOTAGEM E DESLIZAMENTO DE SISTEMAS ROBÓTICOS MÓVEIS EM TERRENOS ACIDENTADOS
The use of mobile robots to monitor non-accessible environments has become increasingly common in the recent years. These tasks can be either autonomous, remote-controlled, or passenger-operated. When performed in rough terrain, it is necessary to guarantee mission safety, since many times it is impossible to send a rescue party for recovery. The hybrid envi
Publicado em: 2007