Development of a four-nozzle flapper servovalve driven by a giant magnetostrictive actuator

Zhu, Yuchuan; Yang, Xulei; Wang, Xiaolu

doi:10.1177/0959651814565829

Cited by 13 publications

(10 citation statements)

References 17 publications

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“…Sangiah et al 7 developed a novel piezohydraulic aerospace servo valve; Karunanidhi and Singaperumal 8 designed, built and integrated a magnetostrictive actuator into an existing flapper–nozzle servo valve. Some novel configuration of servo valve driven by a giant magnetostrictive actuator (GMA) 9–12 is described for improving the dynamic response of the traditional servo valve.…”

Section: Introductionmentioning

confidence: 99%

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

Zhu

Fei

2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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The traditional parameter design rule for the nozzle-flapper valves has always followed the maximum control pressure sensitivity criterion; however, this article queries the validity of this traditional parameter design theory for the comprehensive performance characteristics of a flapper-nozzle valve. Accordingly, a new parameter design rule, which involves symmetry, linearity and sensitivity of the control pressure, was constructed from a detailed and rigorous mathematical derivation that employs a non-dimensional analysis method. Then, an effect verification of the new criterion and a comparison between the pressure-flow curves and three key valve coefficients, which are dominated by the traditional rule and the new criterion, respectively, are performed. Finally, the comprehensive performance characteristics of the flapper-nozzle valve, such as the reliability, response, accuracy, sensitivity, efficiency, anti-disturbance and control pressure range, which are produced by the two parameter design rules, are compared. The results indicate that the performance of nozzle-flapper valve followed by the new parameter design criteria is superior to the performance directed by the traditional one with respect to various indexes, such as the reliability, response, accuracy and anti-disturbance. In addition, for the design of nozzle-flapper valves, the studies have also revealed that the optimal values of the structural parameter are dependent on the actual flapper motion ranges and the priority of the above-mentioned performance indexes. All these new findings can develop and supplement the existing design theory of nozzle-flapper valve and can also be beneficial to the design of double-nozzle-flapper electro-hydraulic servo valves.

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Section: Introductionmentioning

confidence: 99%

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

Zhu

Fei

2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…These new actuators, appeared in recent years, can change their shape and length under the influence of an external magnetic field, thus producing strain with very fast response speed and large forces [22]. In [23], a deflector-jet servovalve using a GMM was developed; instead, in [24] a GMM was used to drive a flapper-nozzle servovalve. Other examples of application of GMMs in servovalves are provided in [25,26].…”

Section: Introductionmentioning

confidence: 99%

A Novel Servovalve Pilot Stage Actuated by a Piezo-electric Ring Bender: A Numerical and Experimental Analysis

et al. 2020

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Electrohydraulic servovalves are widely used for precise motion control in aerospace and other industries due to their high accuracy and speed of response. However, commercial two-stage servovalves have several undesirable characteristics, such as the power consumption caused by the quiescent flow (internal leakage) in the pilot stage, and the complexity and high number of parts of the torque motor assembly, which affect the cost and the speed of manufacture. The solution to these problems can help to reduce costs, weight and power consumption, and enhance the reliability and reproducibility as well as the performance of these valves. For these reasons, this paper proposes a novel configuration for the pilot stage: it is composed of two normally closed two-way two-position (2/2) valves actuated by two piezo-electric ring benders; the opening and closing of the two piezo-valves can generate a differential pressure to be used to control the displacement of the main spool. In this way, there is negligible quiescent flow when the main stage is at rest; in addition, the torque motor and all its components are removed. To assess the performance of this novel pilot stage concept, a prototype of the piezo-valve has been constructed and tested. The experimental results indicate that the response speed of the new piezo-valve is very high. Furthermore, a numerical model is employed to show that, by adjusting specific parameters, the performance of the piezo-valve can be further improved, so that the valve can be fully opened or closed in less than 5 ms.

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“…Magnetostrictive actuators possess similar properties. In addition, their advantages of high power density and dynamics cannot be used for a direct spool drive due to their small stroke, which is why magnetostrictive actuators are mainly combined with hydraulic amplifier stages (Zhu et al, 2015; Zhu and Li, 2014).…”

Section: Introductionmentioning

confidence: 99%

High-response electrorheological servo valve

Heinken

Ulrich

Bruns

et al. 2019

Journal of Intelligent Material Systems and Structures

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The 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. Here, the electrorheological effect as an electrohydraulic valve drive offers great potential. It converts the electrical input signal directly into a controlling mechanical quantity within a few milliseconds and provides theoretically unlimited strain. Thus, the electrorheological effect has the ability to increase the performance of conventional hydraulic systems. This work presents a two-stage servo valve with an electrorheological pilot stage. Furthermore, it introduces a model to describe the static and dynamic properties of the system. The model is validated on the basis of measurement results.

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Development of a four-nozzle flapper servovalve driven by a giant magnetostrictive actuator

Cited by 13 publications

References 17 publications

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

A Novel Servovalve Pilot Stage Actuated by a Piezo-electric Ring Bender: A Numerical and Experimental Analysis

High-response electrorheological servo valve

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