Results 171 to 180 of about 22,464 (227)
A double closed loop digital hydraulic cylinder position system based on switching active disturbance rejection control. [PDF]
Sci RepJiang S +5 more
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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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Magnetorheological valve in servo applications
Journal of Intelligent Material Systems and Structures, 2011In this article, the servo property of a high-performance magnetorheological valve will be evaluated by closing the pressure feedback loop. The magnetorheological valve developed in this study has two separately controllable fluid flow channels and is especially designed for high-frequency applications.
Kostamo, E. +4 more
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Development of rotary servo valve
Proceedings of the JFPS International Symposium on Fluid Power, 1993Conventional electro-hydraulic servo valves have sleeves and spools which move axially to control the flow of fluid. However, very high manufacturing technology is required to make them. This paper describes a newly developed rotary servo valve that has a simple structure and is directly operated.
TADAHIKO NOGAMI +3 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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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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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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