Adjustable Speed
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Comportamento elétrico, mecânico e hidráulico de um sistema de bombeamento sob o enfoque da qualidade de energia elétrica e eficiência energética
The objective of this thesis is to present a methodology of comparison of the electric, mechanical and hydraulical performance of a pump system, under the point of view of the energy efficiency, when supplied with signals power quality. The form used for this intention was to the variation of controlled outflow for strangulation of valve or variation of freq
Publicado em: 2010
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2. Estudo biomecanico de tres tecnicas diferentes de fixações metalicas utilizadas em osteotomia sagital do ramo mandibular / Biomechanical evaluation of three different techniques of rigid fixation in sagital split ramus osteotomy
Studies have considered many techniques and methods of rigid internal fixation (RIF) leads to obtain greater stability to the bone segments and minimum displacement of the condyles after performed the sagittal split ramus osteotomy (SSRO). In this way, the purpose of this study was to evaluate by means of mechanical compression testing model with synthetic h
Publicado em: 2009
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3. Energy expenditure during cane-assisted gait in patients with knee osteoarthritis
OBJECTIVE: To compare the energy expenditure in patients with unilateral knee osteoarthritis while walking with canes of different lengths. METHODS: A quasi-experimental study (single-group) was carried out on thirty patients with unilateral knee osteoarthritis. An adjustable aluminum cane was used, and three different cane lengths were determined for each s
Clinics. Publicado em: 2008
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4. Contribuição ao estudo de aerogeradores de velocidade e passo variáveis com gerador duplamente alimentado e sistema de controle difuso / Contribution to the study of fuzzy control applied to variable-speed variable-pitch wind generators with double-fed induction generator
The efficient capture of aeolic-energy occurs by means of three blades turbines with adjustable pitch-angle and angular-speed. The pitch-angle adjustment is utilized to limit the aeolic-energy capture when occur very strong winds and, the angular speed adjustment is utilized to maximize the capture of kinetic energy of weak winds. In this mode of operation t
Publicado em: 2007
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5. Boost Converter for Mitigation of voltage sags in variable speed drives / Conversor Boost para Mitigação de afundamentos de tensão em acionamentos de velocidade variável
Este trabalho aborda os efeitos de afundamentos de tensão em Acionamentos de Velocidade Variável AVVs para máquinas de corrente alternada, conversores estáticos de dois estágios (retificador-inversor) amplamente utilizados no controle de velocidade e tração. O estudo tem como objetivo analisar o comportamento dos AVVs diante de afundamentos de tensão
Publicado em: 2007
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6. Modeling and analysis of an auto-adjustable stroke end cushioning device for hydraulic cylinders
This paper describes the theoretical-experimental study of an auto-adjustable stroke end cushioning device utilized in hydraulic cylinders, focusing the characterization of the bush geometry effect on the cushioning achieved. A nonlinear model is presented which includes the physical phenomena that exert a significant influence on the performance of this hyd
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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7. HYDROELECTRIC GENERATION WITH ADJUSTABLE SPEED USING DOUBLE-FED MACHINES WITH A STATIC CONVERTER CONNECTED TO THE ROTOR S CIRCUIT / GERAÇÃO HIDRELÉTRICA EM REGIME DE VELOCIDADE AJUSTÁVEL EMPREGANDO MÁQUINAS DE DUPLA ALIMENTAÇÃO COM CONVERSOR ESTÁTICO NO CIRCUITO ROTÓRICO
Os sistemas de potência são projetados para operar com rígidos requisitos de qualidade, de modo que, as usinas hidrelétricas devem gerar energia, mantendo tensão e freqüência elétrica constantes. No método clássico de geração, a freqüência é controlada pelo sistema regulador de velocidade de turbina, que tende a manter a rotação da turbina f
Publicado em: 1997
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8. A high speed, high capacity homology matrix: zooming through SV40 and polyoma.
We present a new homology matrix program which owes its basic conception to the two-dimensional dot matrices previously described (1,2), but has important improvements and new features. It scores sequence homology over an adjustable range and plots the scores which are above an operator-determined filtration level. Its powerful noise-filtration system, capac