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Servo Valve Characteristic Curves
2018Typically, a servo valve is characterized by a series of curves which provide behavioural information of the servo valve under varying operating conditions. These curves are typically used in identifying the valve centre type, null bias, response to inputs of varying amplitudes at varying frequency and phase difference between system input and output ...
J. Jaidev Vyas +2 more
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High-response electrorheological servo valve
Journal of Intelligent Material Systems and Structures, 2019The demand of more powerful and high-dynamic hydraulic actuators gives the servo valve as a control member an increasingly important role. The valve should provide the hydraulic actuator with sufficient volume flow over wide frequency range to achieve large strains at high operating frequencies.
Helge Heinken +3 more
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Comparative Analysis of a Hydraulic Servo-Valve
International Journal of Fluid Power, 2013AbstractThe aim of this work was to obtain the correct hydraulic proprieties of a hydraulic spool servo-valve using computational fluid-dynamics (CFD) techniques and adopting an accurate enough mesh to analyse the flow pattern inside the valve. The zones where thickening of the mesh is necessary have been detected and a method to generate the mesh ...
PACE, LORENZO +5 more
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Journal of Jet Propulsion, 1955
I general ways in which hydraulic control of servo circuits may be considered are: 1. Source control. 2. Line control. That is, (1) the direction and amount of fluid flow may be controlled at the source at which the hydraulic power is generated—for example, by use of a servo pump; or (2) a constant pressure source may be established and a metering ...
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I general ways in which hydraulic control of servo circuits may be considered are: 1. Source control. 2. Line control. That is, (1) the direction and amount of fluid flow may be controlled at the source at which the hydraulic power is generated—for example, by use of a servo pump; or (2) a constant pressure source may be established and a metering ...
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Servo-Valve Controlled Isolation Systems
Proceedings of the Institution of Mechanical Engineers, 1970Active isolation systems using nozzle-flapper valves and pneumatic springs are capable of much improved isolation characteristics when compared with conventional isolation systems, but they suffer from the fact that large quiescent leakage flows are required for satisfactory dynamic performance of the isolation system (1)‡.
J. I. Soliman, D. Tajer-Ardabili
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High speed solenoid valves in pneumatic servo applications
2007 Mediterranean Conference on Control & Automation, 2007Pneumatic driving systems are mainly used in industrial applications where the moving parts are usually fixed by the mechanical stops. For flexible and precise positioning tasks of pneumatic drives relatively expensive proportional valves have been implemented.
Šitum, Željko +2 more
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Exploring the use of two servo-valves for servo-pneumatic control
The International Journal of Advanced Manufacturing Technology, 2018Pneumatic actuators find widespread use in industry when motion between two end-points is required, given their high power to weight ratio and low maintenance requirements. However, classical PID control of pneumatic actuators may present several undesired features, such as large steady-state errors.
Paul Dólleman +2 more
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1976
Electrohydraulic systems use low-power electrical signals (of less than say 1 W) for precisely controlling the movements of large power hydraulic pistons and motors (which may be rated at say 10 hp—7460 W—or more). The ‘interface’ between the electrical (control) equipment and the hydraulic (power) equipment is the so-called ‘electrohydraulic servo ...
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Electrohydraulic systems use low-power electrical signals (of less than say 1 W) for precisely controlling the movements of large power hydraulic pistons and motors (which may be rated at say 10 hp—7460 W—or more). The ‘interface’ between the electrical (control) equipment and the hydraulic (power) equipment is the so-called ‘electrohydraulic servo ...
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Research on Electro-hydraulic Servo Valve Structure and Control Algorithm of System with Servo Valve
Recent Patents on EngineeringBackground: With the continuous progress of electronic information technology, people have begun to study the combination of electronic information technology and hydraulic technology to achieve more accurate and flexible control. Electro-hydraulic servo technology was thus developed.
Jianying LI +4 more
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Iterative Learning Control of Double Servo Valve Controlled Electro Hydraulic Servo System
2011 Seventh International Conference on Computational Intelligence and Security, 2011Aimed at electro-hydraulic servo force control system, according to the nonlinear of electric-hydraulic servo valve, to improve the speed of equivalent valve response, we propose the double electric-hydraulic servo valve parallel control, and two servo valve are controlled by their respective controller, the same signal inputs two controller, every ...
Yu Shaojuan, Song Junjun
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