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In a gerotor pump, pressure pulsation occurs in a chamber through contact with the internal and external rotors. This causes an overhung load on the pump shaft bearing and cavitation, which affect the durability and noise of the pump. In this study, relief grooves on the port plate were designed to reduce pressure pulsation and verified experimentally. The opening areas between the port plate and...
This paper deals with robust control of Electro-Hydraulic Load Simulator(EHLS). An electro-hydraulic system consists of uncertainties such as parametric uncertainty due to hydraulic properties of working fluid varying with temperature, nonlinear relation between flow rate, load pressure, and input of a servo valve and disturbance acting on actuators. Therefore, these uncertainties and disturbance...
This paper presents a robust hydraulic position control with perturbation estimation. In hydraulic system, there are perturbations such as parametric uncertainty due to variable fluid properties depending upon temperature, nonlinear relation between input signal, flow rate and load pressure of servo valve, external disturbance and hard-to-model forces inside cylinder. Therefore, these perturbations...
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