Rotative System
Mostrando 1-10 de 10 artigos, teses e dissertações.
-
1. Estudo do desgaste e atrito em ensaios micro-abrasivos por esfera rotativa fixa em condições de força normal constante e pressão constante. / Wear and friction study in micro-abrasive wear testing by rotative fixed ball under conditions of constant normal force and constant pressure.
The micro-scale abrasive wear test by rotative ball has gained large acceptance in universities and research centers, being widely used in studies on the abrasive wear of materials. Two wear modes are usually observed in this type of test: rolling abrasion results when the abrasive particles roll on the surface of the tested specimen, while grooving abrasion
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
-
2. Considerações biológicas e econômicas sobre um sistema de produção silvo-agrícola rotativo na região do Tapajós.
1983
Belém. Publicado em: 2011
-
3. Implementação de sistemas inteligentes em processadores digitais para controle de máquinas elétricas rotativas / Implementation of intelligent system in digital processor for rotative electric machine control
The objective of this work consists of the implementation of intelligent system architecture in Digital Signal Processor (DSP) aiming at the real-time three-phase induction motor control. Therefore, a fuzzy logic speed control drive system for three-phase induction motor is proposed, whereas the control methodology is based on voltage and frequency (Volts/He
Publicado em: 2008
-
4. Desenvolvimento de um atuador magnetico para excitação sem contato de sistemas rotativos / A magnetic actuator development for contactless excitation in rotor systems
A magnetic actuator as excitation source in rotating systems is developed, in order to accomplish modal analysis and other studies involving contacless excitation. Although the use of magnetic systems to apply forces onto rotating machinery has been carried out with high performance level (for example, magnetic bearings), the development of a conveniently ea
Publicado em: 2008
-
5. Experimental performance evaluation of magnetic actuator used in rotating machinery analysis
A magnetic actuator as excitation source in rotative systems is proposed, in order to accomplish modal analysis without contact between the actuator and the rotor. Although the use of electromagnets for applying forces to rotating machinery have been carried out with high performance level (for example, magnetic bearings), the development of a conveniently e
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
-
6. Hydrodynamic journal bearing analysis under fluid-induced instabilities / Analise de mancais hidrodinamicos em rotores sob instabilidade fluido-induzida
In this investigation, the analysis and validation of rotative system supported by hydrodynamic journal bearings was accomplished. A non-linear hydrodynamic bearing model was considered. The rotary shaft and rotor mass were modeled by The Finite Element Method. The combination of these models is able to simulate the system response to the auto-excitation cau
Publicado em: 2007
-
7. Avaliação postural de idosos: metodologia e diagnóstico / Postural assessment of elderly people: methodology and diagnosis
This descriptive study aimed validating the postural evaluation system and to evaluate the posture of the cervical and thoracic spine area in the sagittal plan with the level of physical activity of elderly people. The sample was composed by 72 people (elderly), being 55 women and 17 men, with average age of the 69,19 years old (_=6,63), all of them belonged
Publicado em: 2007
-
8. Extração e recuperação da bromelina em sistemas de duas fases aquosas PEG4000-POLICAJU
Aqueous two-phase system explores the possibility of solutions of two polymers or one polymer and one salt separating into two immiscible aqueous phases, when certain critical concentrations are exceeded. This work was characterised by the KA W ASE recovery index analysis of the bromelain of pineapple juice, using a pulsed column for three sizes of tie lines
Publicado em: 2004
-
9. Mecanização e automação de metodologias de analise quimica : instrumentação para destilação seguida de detecção por (ICP OES) e para extração liquido-solido e detecção por espectrometria no visivel
In this work we present two equipment that were built from a common basis (an electronic interface): the first is a mechanized equipment capable of volatilizing compounds with boiling point up to 160°C and injecting them dírectly in to the torch of an inductively coupled plasma optical emission spectrometer. The equipment consists of a rotative tray that w
Publicado em: 2002
-
10. Análise econômica de dois sistemas de descascamento de madeira de eucalipto / Economic analysis of two systems of descascamento of eucalyptus wood
The objective of this work was to analyze the two systems of the eucalyptus wood peeling, utilized by the Brazilian forest companies, with the purpose to identify the most advantageous in the economical point of view. The evaluated systems were the fixed system, composed by a barrel of industrial peeling, and a mobile, composed by an agricultural tractor mod
Publicado em: 2000