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Doctoral Thesis
DOI
https://doi.org/10.11606/T.18.1999.tde-13062024-170513
Document
Author
Full name
Mitsuo Serikawa
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1999
Supervisor
Committee
Pinotti Junior, Mario (President)
Bannwart, Antonio Carlos
Carvalho, Rene Ayres
Roma, Woodrow Nelson Lopes
Seleghim Junior, Paulo
Title in Portuguese
Fluxo hidráulico axial chaveado em "PWM" aplicado a servoválvulas
Keywords in Portuguese
ftuxo hidráulico chaveado
servoválvula
servoválvula chaveada
Abstract in Portuguese
O trabalho mostra o estudo sobre a modelagem matemática de fluxo de óleo hidráulico que passa através de orifícios circulares e é chaveado em alta frequência. Esta estudo teve início a partir do modelo já consagrado do fluxo de vazão contínuo passando através de um orifício. Os parâmetros de ajustes para o caso do escoamento pulsado foram deduzidos matematicamente e os coeficientes obtidos da prática por meio dos ensaios. Durante a modelagem, puderam-se adotar os valores médios das variáveis utilizadas sem prejuízo de sua aplicação nos problemas da engenharia. O novo modelo de fluxo hidráulico chaveado em "PWM" foi aplicado na modelagem da servoválvula rotacional de BROWN et al. (1988) e SERIKAWA (1992) já desenvolvido em1988. Os resultados obtidos foram comparados com os de ensaios práticos já realizados por estes autores
Title in English
The switching hydraulic axial flux "PWM" applied to servovalves
Keywords in English
servovalve
switching hydraulic flux; switching servovaive
Abstract in English
This paper intends to show the mathematícal model of hydraulic oil that passes through circuiar holes and is switched in high frequency. These studies have started from the point of view of the already accepted continuous flow flux passing through a hole model. The fitting parameters concerning pressed flux were deduced mathematically and the coefficients were obtained by using these experiments. During modeling, variable medium values could be adopted and used without any damage to engineering problems. The hydraulic switching flux in "PWM", new model was used in the switching servovalve modeling by BROWN et al. (1988) and SERIKAWA (1992). It had already been developed in 1988. The results, obtained were compared to the practical experiments these authors have already accomplished.
 
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Publishing Date
2024-06-13
 
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