Mathematical modelling and simulation of a jet pipe electrohydraulic flow control servo valve

Hiremath, Somashekhar S.; Singaperumal, M.; Kumar, R. Suresh

doi:10.1243/09596518jsce238

Cited by 23 publications

(16 citation statements)

References 13 publications

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“…An attempt has been made to predict the stiffness in the feedback spring pole (Somashekhar, et al, 2007). The finite element analysis was carried out in Abaqus ver.…”

Section: Feedback Spring Stiffnessmentioning

confidence: 99%

Modeling for finding armature assembly moment of inertia in jet pipe servo valve torque motor

Pham

2014

JAMDSM

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Jet pipe electro-hydraulic servo valve is the heart of feedback control system, its performance plays an important role in establishing the properties of the system. Dynamic characteristics of the jet pipe servo valve depend on many parameters such as the stiffness of flexure tube and feedback spring or the moment of inertia of torque motor. The research results show that the stiffness of armature assembly and feedback spring are the key parts which can be directly related to the geometric and material parameters of torque motor. A suitable stiffness of the elastic system is necessary because a too low stiffness results in unstable equilibrium while a high stiffness requires a high electric input current. It is required the best stiffness of the flexure tube and the overall system for improving dynamic characteristics. A finite element method analysis is used in mathematical model for finding stiffness of the elastic system, moreover, the effect of amplitude bandwidth on the dynamic characteristics is developed, too. In order to improve the dynamic response bandwidth of two-stage jet pipe electro-hydraulic servo valve, optimal design for the moment of inertia of torque motor is investigated in this paper. The approximate range of the moment of inertia, J a , is found and the proper cause-effect relationship between the bandwidth and, J a , is revealed as well. IntroductionJet pipe electro-hydraulic servo valve is one of the mechatronic component used for controlling the flow direction, volume flow rate, force, pressure, position, speed and acceleration. Nowadays, when rapid and precise control of sizeable loads is required an electro-hydraulic servo valve is often the best approach to the problem. In general, the electro-hydraulic servo actuator provides fast response, high force and short stroke characteristics. Jet pipe electrohydraulic servo valve is widely used in electro-hydraulic servo system. It is mainly made of the torque motor, jet pipe, flexure tube, receiver holes, core body, spool, and feedback pole and sleeve assembly. The torque motor is an electromechanical transducer used to convert small electric current to a mechanical torque to deflect a jet pipe servo-valve. As the structural parameters of the torque motor is unreasonable in designing or torque motor design parameters for the first-stage of servo valve and the main valve structural parameters is not reasonable in matching, it often leads to an increase in non-linear and unstable properties (Li, et al., 2005). Similarly, the restoring torque, from jet pipe through flexure tube to armature and armature bush, if the flexure tube is not properly designed with regard to stiffness, the servo-valve operation is affected (Urata, et al., 2008). Somashekhar (Somashekhar, et al., 2004) simulated the steady state valve operation with using the FEM. The FEM analysis was carried out both as a static and as a dynamic analysis. Recently, researchers have tried to control the hydraulic actuators, using different approaches, adaptive controllers, slid...

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“…An attempt has been made to predict the stiffness in the feedback spring pole (Somashekhar, et al, 2007). The finite element analysis was carried out in Abaqus ver.…”

Section: Feedback Spring Stiffnessmentioning

confidence: 99%

Modeling for finding armature assembly moment of inertia in jet pipe servo valve torque motor

Pham

2014

JAMDSM

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“…Therefore, the study and development of the mathematical model for the shape curve of the throttle valve core surface becomes the key point [12][13][14][15][16].…”

Section: Development Of the Mathematical Modelmentioning

confidence: 99%

Mathematical Modeling and Validation on a New Valve Core of the Throttle Valve in MPD

Liu

Wang

et al. 2013

Advances in Mechanical Engineering

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To achieve different demands for pressure control in managed pressure drilling (MPD), the relationship between the pressure difference and the valve opening was analyzed in the working process of MPD throttle. The throttle flow area equation and the flow area isosurface equation at different openings were derived. Then, the mathematical model of the throttle valve surface shape was established by solving the envelope curve of isosurface cluster. Furthermore, the shape curve equation of the valve core surface was derived and modified by applying this mathematical model. Finally, to verify the performance of this investigation, the comparison of the results between simulation and design values was performed. The results showed that the correlation between the throttle pressure difference and the valve opening is linearly related, which proves the correctness of the mathematical model for the throttle valve surface.

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“…An innovative approach of modeling the fluid-structure interaction (FSI) of the jetpipe servovalve was analyzed. 22 The FSI is established between the piston and the fluid cavities at the piston end. Simulation was carried out using the FE approach to study the variation of cavity pressure, cavity volume, mass flow rate, and the actuator velocity.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the critical parameters affecting the working design dynamics of a torque motor employed in an electro-hydraulic servovalve

Sharan

Hiremath²,

Venkatesha

et al. 2018

SIMULATION

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The torque motor is an intricate assembly in electro-hydraulic technology and plays a crucial role in converting the electrical signal into controlled mechanical output signal. It involves many precise components, such as the feedback spring, armature and its coil, permanent magnet, feed pipe, flexure shaft, jetpipe, and flexure support. The components are embedded together as a single operating component. Each component contributes to the effective dynamics of the system. The present paper proposes a novel approach to investigate the effect of critical parameters on the working design dynamics of the torque motor employed in the jetpipe electro-hydraulic servovalve. Based on the principles of mechatronics, a mathematical model is developed. The model-based design approach is employed to investigate the dynamics of the system. The required simulation parameters of the critical and precision components were obtained from solid and finite element (FE) models. The solid and FE models of the critical and precision components were first analyzed with suitable boundary and loading conditions to establish the stiffness. To validate the obtained FE results, experiments were carried out with a specially designed and fabricated test setup. Based on the basic principle of electromagnetics, a nonlinear FE model of torque motor is analyzed for magnetic field distribution, the torque developed, and armature and jetpipe deflection for varied input current. From the results obtained, good agreement was observed between FE, simulated, and experimental values. The present novel approach enables one to improve the working design dynamics of the torque motor.

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Mathematical modelling and simulation of a jet pipe electrohydraulic flow control servo valve

Cited by 23 publications

References 13 publications

Modeling for finding armature assembly moment of inertia in jet pipe servo valve torque motor

Modeling for finding armature assembly moment of inertia in jet pipe servo valve torque motor

Mathematical Modeling and Validation on a New Valve Core of the Throttle Valve in MPD

Investigation on the critical parameters affecting the working design dynamics of a torque motor employed in an electro-hydraulic servovalve

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