A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve

Lin, S. J.; Akers, A.

doi:10.1115/1.3153006

Cited by 27 publications

(12 citation statements)

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“…Several studies have been proposed to model servovalves, using analytical, CFD (Computational Fluid Dynamics) and/or FEM (Finite Element Method) approaches (Lin and Akers, 1989, Hiremath, 2013, Urata et al, 2008, Ghasemi et al, 2008, Di Rito and Galatolo, 2008, El-Araby et al, 2011, Gordić et al, 2004, Maré and Attar, 2008, Hiremath and Singaperumal, 2010. In this section, analytical models are considered.…”

Section: Servovalves: Operating Principles and Analytical Modelsmentioning

confidence: 99%

A Review of Electro-Hydraulic Servovalve Research and Development

Tamburrano

Plummer

Distaso

et al. 2019

TJFP

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This paper provides a review of the state of the art of electro-hydraulic servovalves, which are widely used valves in industrial applications and aerospace, being key components for closed loop electrohydraulic motion control systems. The paper discusses their operating principles and the analytical models used to study these valves. Commercially available units are also analysed in detail, reporting the performance levels achieved by current servovalves in addition to discussing their advantages and drawbacks. Adetailed analysis of research that investigates these valves via computational fluid dynamic analysis is also provided. Research studies on novel control systems and novel configurations based on the use of smart materials, wh

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Section: Servovalves: Operating Principles and Analytical Modelsmentioning

confidence: 99%

A Review of Electro-Hydraulic Servovalve Research and Development

Tamburrano

Plummer

Distaso

et al. 2019

TJFP

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“…Since the accuracy of the estimator (14) and the condition in Eq. (15) are influenced by the experimental conditions, a suitable periodic input signal is designed. As a result, see Ref.…”

Section: Nonparametric System Identificationmentioning

confidence: 99%

“…Typically, these models are assembled from component models, including hydraulic pumps, valves, channels, and hydraulic cylinders, see, e.g., Refs. [14][15][16][17][18][19] for examples. Furthermore, a model of the dynamic characteristics of the variator is required [20] for the description of the interaction between the primary hydraulic circuit and the secondary hydraulic circuit that is introduced by the pushbelt.…”

Section: Introductionmentioning

confidence: 99%

High Performance Continuously Variable Transmission Control Through Robust Control-Relevant Model Validation

Oomen¹,

Meulen

2013

Journal of Dynamic Systems, Measurement, and Control

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Optimal operation of continuously variable transmissions (CVTs) is essential to meet tightening emission and fuel consumption requirements. This is achieved by accurately tracking a prescribed transmission ratio reference and simultaneously optimizing the internal efficiency of the CVT. To reduce the power losses in a CVT, the absolute pressure levels are lowered, which increases the sensitivity to torque disturbances and increases the importance of disturbance feedforwards. This requires a high performance feedback controller for the hydraulic actuation system in a CVT. The aim of this paper is to develop a multivariable feedback controller for the hydraulic actuation system that is robust with respect to the varying system dynamics that are induced by the varying operating conditions, including transmission ratio changes. Hereto, new connections between system identification and robust control are exploited to achieve high performance. As a result, the varying system dynamics are directly evaluated in terms of closed-loop performance objectives. Subsequent robust control design reveals an increase of the control performance of almost a factor two in terms of the criterion value. This leads to improved simulated and measured closed-loop step responses, including a decrease in settling time from 0.4 s to 0.2 s. Finally, the designed robust controller is successfully validated in a standardized driving cycle experiment.

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“…In view of the problem that the traditional servo valve modeling method cannot describe the servo valve system from the component level, the object-oriented Modelica modeling language is used to model the entire valve [5]. Considering the nonlinear terms that are often limited in establishing the description equations, Dasgupta and Murrenhoff [6] used a Bond diagram technique to establish a comprehensive dynamic model of the hydraulic motor drive system.Using the bond graph method has the advantage of dealing with complex systems with multiple energy domains.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Research on Flow Force and Pressure Stability in a Nozzle-Flapper Servo Valve

Kang¹,

Yuan²,

Sadiq³

2020

Processes

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In the nozzle flapper servo valve, the transient flow force on the flapper is the fundamental reason that affects the pressure stability. The pressure pulsation in the pilot stage causes forced vibration of the flapper, and its deviation will directly influence the control pressure difference, which will make the pressure appear unstable. In order to grasp the principle and characteristics of transient flow force and its influence on pressure stability, a mathematical model of flapper displacement and control pressure is derived. For collecting the dynamic changes of the transient flow force and recording the motion behavior of the flapper, a three-dimensional model of the pilot-stage is established. Numerical simulations of turbulence phenomenon analysis are conducted with a variation of flapper displacement ranging from 5 μm to 20 μm. It can be concluded that the change trend of the flapper displacement is similar to the steady-state flow force and the transient flow force pulsation amplitude. Under the same structural parameters, the pulsating frequency of the flow force remains basically constant. The fluctuation of the flow force of the pilot stage will cause the pressure of the servo valve control cavity to vibrate to a certain extent, which is a factor that cannot be ignored that affects the output stability of the servo valve.

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A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve

Cited by 27 publications

References 0 publications

A Review of Electro-Hydraulic Servovalve Research and Development

A Review of Electro-Hydraulic Servovalve Research and Development

High Performance Continuously Variable Transmission Control Through Robust Control-Relevant Model Validation

Numerical Simulation and Experimental Research on Flow Force and Pressure Stability in a Nozzle-Flapper Servo Valve

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