THE STATIC AND DYNAMIC PERFORMANCE OF FLUID POWER SERVO CONTROL SYSTEM UNDER VARIATION OF HYDRAULIC ACTUATORS (CYLINDERS) DESIGN

Document Type : Original Article

Authors

1 Department of Production Engineering and Design Faculty of Engineering, Minia University, Minia, Egypt.

2 Department of Mechanical Engineering Faculty of Engineering, Beni-Suef University, Beni-Suef, Egypt.

Abstract

The fluid power control systems are primarily applied in automated systems such as production systems, flight simulation, robotics, ships and electromagnetic marine engineering, injection molding equipment. In this paper, we investigated the fluid power control system performance by variations of designed hydraulic actuators (cylinders). The system has been designed to offer linear hydraulic displacement with controlled speed for different values of operating variables; supply pressure; ps, spring stiffness; K, load; W, with constant oil temperature; T = 30 OC and variability for hydraulic actuators (cylinders) connected to the electrohydraulic servo control valve (SV). The comparison of system flow rate, supply pressure, stroke period and dynamics was investigated. It was found that, when connected to a single-rod hydraulic cylinder, the system exhibits a higher flow rate during the forward stroke compared to the backward stroke. Conversely, a double-rod cylinder achieves a higher flow rate than a single-rod cylinder during backward movement. The actual supply pressure improves in the case of connecting the single rod hydraulic cylinder in forward stroke is higher than on the backward stroke. While the double rod cylinder achieves higher actual supply pressure than the single rod cylinder in backward movement. The frequency of piston displacement decreases with connecting a single rod cylinder in forward stroke (Cy.2*) more than with other cylinders. For example, at ps = 50 bar and full stroke the frequencies are 0.093458 and 0.068027 Hz for the double rod cylinder and the single rod cylinder respectively. The bandwidth frequency is higher by 37.34 %. 

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