Results 181 to 190 of about 22,464 (227)
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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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Fault Diagnostic of Electro-Hydraulic Servo Valve
Advanced Materials Research, 2012In order to achieve the fault diagnostic and degradation assessment of the electro-hydraulic servo valve, a system of prognostic and health management based on the data-driven approach for the electro-hydraulic servo valve is presented. FMMEA performed in this study considered the degree of sub-components in electro-hydraulic servo valve.
Hai Yang Pan +3 more
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Study of leakage model for servo valve
2011 IEEE International Conference on Mechatronics and Automation, 2011This paper presents a new empirical leakage model of valve. The whole hydraulic system is studied: the system's model utilizing the proposed leakage formula is compared against another model, a known semi-empirical model employing the idea of pseudo section in flowrates.
Junhong Liu +3 more
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Double-Orifices Pneumatic Servo Valve
2019Pneumatic servo valve is the core component of pneumatic servo system. Pneumatic servo valve can be divided into one-side pneumatic servo valve, two-side pneumatic servo valve, and four-side pneumatic servo valve according to the number of throttling edges. There are three kinds of coordination states in axial size of even number of throttling orifices
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