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Modeling and Sensitivity Analysis of a Sample Electro Hydraulic Servo Valve

Nakhai, Amir Hassan | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46668 (08)
  4. University: Sharif University Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saadat Foumani, Mahmoud
  7. Abstract:
  8. Servo control valves including pressure control valves and flow control valves are the main components of the hydraulic system. Since these valves are responsible for controlling the flow or pressure in hydraulic systems, are important. In the present study, we focus on modeling and sensitivity analysis of an electro-servo-hydraulic valve with two stages. The first stage mechanism is the seating type (flapper-nozzle) and the second stage mechanism is the sliding type (spool type). For simulation main components of the servo valve include torque motor, flapper, flow through the nozzle-flapper, flow through the orifice and flow through the valve spool and body separately have been modeled. Then using the results of the modeling component of the valve, the governing equations are written based on the principle of continuity and balance of forces and mathematical model of the valve is obtained. Based on the model of the servo Valve, the flow-current curve of the valve in the state of steady and no load is presented and compared with experimental results. Comparison of modeling results with experimental results indicates that is an adaptation of the results and success in modeling. Then the flow-current curve has been analyzed for the sensitivity on variation of four important parameters of the valve. These parameters are orifice diameter, equilibrium distance of nozzle and flapper, stiffness of spool spring and stiffness of flexure tube. After the sensitivity analysis it was recognized that the mentioned curve is more sensitive with change in equilibrium distance of nozzle and flapper
  9. Keywords:
  10. Servohydraulic Valve ; Modeling ; Sensitivity Analysis ; Spool Wire ; Control Valve ; Characteristic Curve ; Flapper

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