直动式机载2D电液压力伺服阀特性

doi:10.7527/S1000-6893.2017.421294

Abstract

Abstract:

A direct-acting Two Dimensional (2D) electro-hydraulic servo valve is designed, in which the main spool is driven by the 2D servo piston mechanism to get the load pressure as required. Linear Variable Differential Transformer(LVDT) is used for testing and forming closed loop position feedback.The displacement of piston can be controlled precisely using closed-loop feedback. The opening degree of the main spool connecting to the piston with a spring is changed by the force of the spring produced by the movement of the piston under the pressure difference on both sides to control the load pressure as accurately as possible. Based on the theory of squeeze oil film, a disc structure is applied to the main spool to increase the damping ratio and to improve the stability and reliability of the system. Static and dynamic characteristics are analyzed by simulating the mathematical model of the valve, and the feasibility of the prototype is verified in the experiment. The results demonstrate good characteristics of voltage follower and stable output, with the step response time being 30 ms, the hysteresis less than 3%, and the linearity less than 2%, when the system pressure is 28 MPa. Compared with traditional direct-acting proportional servo valve, the valve has the advantages of strong anti-pollution, high reliability, light weight and small volume (about 1/5 in mass and 1/7 in volume of the same kind of servo valve), and is very suitable for the airborne hydraulic braking system.

Key words: airborne, two-dimensional piston, pressure servo, LVDT, stability

CLC Number:

ZUO Xiqing, RUAN Jian, LIU Guowen, YU Zheqing. Characteristics of direct-acting airborne 2D electro-hydraulic pressure servo valve[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(11): 421294-421294.

References

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Characteristics of direct-acting airborne 2D electro-hydraulic pressure servo valve

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