Dynamic Analysis of a Flapper-Nozzle Valve

Lin, S. J.; Akers, A.

doi:10.1115/1.2896343

Cited by 29 publications

(9 citation statements)

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“…Frequently models [6,7,8,9,10] use various methods to linearize either the flow or the dynamic equations. The modeling tool presented here does not require linearization as Matlab will integrate nonlinear systems.…”

Section: Theory Of Hydraulic Servovalves and Cylindersmentioning

confidence: 99%

<title>Modeling tool for design and simulation of complex mechanical systems</title>

Austin

1997

SPIE Proceedings

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A modeling tool which allows for design and simulation of multi-domain systems is presented in this paper. The tool is comprised of modular submodels, or blocks, which can be linked together using a graphical interface. Two models of physical systems are constructed. The first system is composed of a voltage controlled motor under digital PID control. An electrohydraulic system used for sheet metal forming is also modeled. Good agreement has been achieved between the results of the simulation and experimental results.

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Section: Theory Of Hydraulic Servovalves and Cylindersmentioning

confidence: 99%

<title>Modeling tool for design and simulation of complex mechanical systems</title>

Austin

1997

SPIE Proceedings

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“…A nonlinear model of the first stage of a servo-valve has also been developed (Lin and Akers, 1991). In both cases, their models were successful in predicting the behavior of an actual valve; however, the level of detail made these more suitable for analysis and valve design applications than for controller design.…”

Section: Electrohydraulic System Nonlinearitiesmentioning

confidence: 99%

Dynamic Feedback Linearization for Electrohydraulically Actuated Control Systems

Vossoughi

Donath

1995

Journal of Dynamic Systems, Measurement, and Control

142

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Using the dynamic inversion principal, a globally linearizing feedback control law is developed for an electrohydraulic servo system. The proposed control law is implemented on a rotational joint driven by a linear actuator. The results from experiments indicate that better uniformity of response is achieved across a wider range of operating conditions than would otherwise be possible. Improved symmetry is obtained for the extension and retraction phases of motion for an asymmetric actuator under various loading conditions and actuator positions. As a result of the improvements in linearity, significantly better performance is achieved when using linear controllers. To incorporate the effects of parametric uncertainties on the feedback linearization, a state space linear fractional representation of the parametrically uncertain linearized system is also developed. This uncertainty model is specifically suited for the design of robust control systems using the /x-synthesis and H" based approach. Electrohydraulic SystemControl. Presently, no comprehensive control strategy dealing with all the nonlinearities in electrohydraulic systems exists. Model reference adaptive 468 / Vol. 117, DECEMBER 1995 Transactions of the ASME Copyright © 1995 by ASME Downloaded From: http://dynamicsystems.asmedigitalcollection.asme.org/ on 09/16/2013 Terms of Use: http://asme.org/terms

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“…The design aspects and various configurations of EHSV particularly on flapper/nozzle are available in many text books [4,5,6]. The effect of squeeze film damping on the performance of the servovalve is investigated by Lin and Akers [7]. The flow forces on the spool dynamics of flapper/nozzle EHSV and their compensation methods are elaborated by Lee et al [8].…”

Section: Introductionmentioning

confidence: 99%

Fluid structure interaction in electrohydraulic servovalve: a finite element approach

Hiremath

Singaperumal

2009

SPIE Proceedings

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Electrohydraulic servovalves (EHSV) promise unique application opportunities and high performance, unmatched by other drive technologies. Typical applications include aerospace, robotic manipulators, motion simulators, injection molding, CNC machines and material testing machines. EHSV available are either a flapper/nozzle type or a jet pipe type. In the present paper an attempt has been made to study the dynamics of jet pipe EHSV with built-in mechanical feedback using Finite Element Method (FEM). In jet pipe EHSV, the dynamics of spool greatly depends on pressure recovery and hence the fluid flow at spool ends. The effect of pressure recovery on spool dynamics is studied using FEM by creating the fluid-structure-interaction. The mechanical parts were created using general purpose finite elements like shell, beam, and solid elements while fluid cavities were created using hydrostatic fluid elements. The analysis was carried out using the commercially available FE code ABAQUS. The jet pipe and spool dynamics are presented in the paper.Keywords: Fluid-structure-interaction, drain line orifice, mechatronic component, finite element method, feedback. INTRODUCTIONFluid power control is the transmission and control of energy by means of a pressurized fluid, is an old and well recognized discipline. The growth of fluid power has accelerated with our desires to control ever increasing quantities of power and mass with higher speeds and greater precision. More specifically, where precise motion control is desired and space and weight are limited, the convenience of high power-to-weight ratio makes hydraulic servomechanisms the ideal control elements. The demand to achieve more accurate and faster control at high power levels, especially in the areas of machine tools, primary flight controls, and automatic fire control produced an ideal marriage of hydraulic servomechanisms with electronic signal processing. Information could be transduced, generated, and processed more easily in the electronic medium than as pure mechanical or fluid signals, while the delivery of power at high speeds could be accomplished best by the hydraulic servo. This marriage of electronics and hydraulics into electrohydraulic servomechanisms created both a solution to an existing class of control problems and a demand for a whole new strain of components. The evolution of these components is really a story of increasingly demanding applications each of which caused the creation of better, or more efficient, or more reliable, or faster devices. To satisfy this demand, new manufacturing methods had to be conceived and original testing techniques developed.Electrohydraulic Servovalve (EHSV) are faster responding directional, pressure and flow control valves which are frequently used in a closed loop arrangements to produce the highly sophisticated performance, in terms of high

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Dynamic Analysis of a Flapper-Nozzle Valve

Cited by 29 publications

References 0 publications

<title>Modeling tool for design and simulation of complex mechanical systems</title>

<title>Modeling tool for design and simulation of complex mechanical systems</title>

Dynamic Feedback Linearization for Electrohydraulically Actuated Control Systems

Fluid structure interaction in electrohydraulic servovalve: a finite element approach

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