Results 171 to 180 of about 3,510 (216)
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The Journal of the Acoustical Society of America, 1993
Low frequency, high intensity sound is produced using a conduit having a flow of high velocity and low pressure air. A pair of sound ports are provided in the conduit, and a rotary valve connected to a reversible servomotor and audio source is employed to direct the flow of air toward and away from the ports.
Thomas J. Danley, Charles A. Rey
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Low frequency, high intensity sound is produced using a conduit having a flow of high velocity and low pressure air. A pair of sound ports are provided in the conduit, and a rotary valve connected to a reversible servomotor and audio source is employed to direct the flow of air toward and away from the ports.
Thomas J. Danley, Charles A. Rey
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Research to the Wear and Geometric Error Relations of Electro hydraulic Servo Valve
Procedia Engineering, 2011 The working principle, failure modes and failure causes of the jet pipe servo valve has been analyzed. Get the main failure modes of the servo valve, which is caused by wear.
Li, Yuan +5 more
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Research of non-servo valve electro-hydraulic servo system
Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology, 2011A new non-servo valve electro-hydraulic servo system was researched. To control load, the system uses bidirectional fixed displacement hydraulic pump that is driven by AC PMSM directly drives servo-hydraulic cylinder. The hydraulic actuating unit was designed base on one design parameter and performance target.
Geqiang Li, Hanjie Wang, Xiaodong Huang
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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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The Design of a Rotary Wheel Servo Valve
2021The vibration device is the vital part in hydraulic linear friction welder. To improve its friction vibration servo system performance, i.e. the high frequency working ability of the servo valve, a new kind of rotary wheel servo valve with high frequency characteristics was put forward. It possesses the potential to improve the performance of hydraulic
Yang Libin +3 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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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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Low noise hydraulic servo valve
The Journal of the Acoustical Society of America, 1979A fluid flow control valve which includes a body formed to define a chamber having inlet, outlet and actuating ports for supplying and receiving fluid to and from external hydraulic machinery to be actuated and including a valve spool formed with several lands and slidably arranged in the chamber for controlling the flow of fluid through the ports, in ...
Paul F. Hayner +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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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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