航空双系统直驱伺服阀阀芯振荡机理及抑制方法

doi:10.7527/S1000-6893.2022.26912

Abstract

Abstract:

Behavior and reliability of electrohydraulic servovalves， one of the key components in flight control systems， will bear directly on flight performance and safety. Direct drive servovalves are currently becoming the research hot spot because they have simple structure， strong anti-pollution ability and large output power. Aiming at spool oscillation of a new dual-system direct drive servovalve， this paper proposes pressure pulsation on ring surface of the spool cavity caused by cavitation as a leading factor of spool oscillation. Gas-liquid two-phase numerical simulation is conducted to examine the cavitation and the pressure configuration near the opening， and thus the mechanism between the cavitation and the spool oscillation is revealed. A dynamic model of the dual-system spool is established. Simulations of hydraulic force and displacement oscillation of the spool under typical conditions are in good agreement with the experiments， which verifies the reliability of the proposed method. Results show that， length-diameter ratio of the spool rod and the numbers of orifices upstream has great influence on the spool oscillation. With 18% cutdown in the length-diameter ratio， the oscillation amplitude can be reduced by 67%. The work provides a theoretical reference for oscillation suppression of dual-system direct drive servovalves in engineering.

Key words: dual-system direct drive servovalve, spool oscillation, cavitation, ring surface, suppression

CLC Number:

V249.1

Bin WANG, Pengda REN, Wei ZHANG, Zhigang XIE, Wenxing ZHANG. Mechanism and suppression method for spool oscillation of aerospace dual⁃system direct drive servovalve[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(5): 426912.

Figures/Tables 22

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参数	数值
时间步长	1.00×10^-5
液态油液密度/（kg·m^-3）	889
液态油液黏度/（kg·m^-1·s^-1）	0.045
蒸汽油液密度/（kg·m^-3）	0.55
蒸汽油液黏度/（kg·m^-1·s^-1）	1.34×10^-5
饱和蒸气压/kPa	4

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Mechanism and suppression method for spool oscillation of aerospace dual⁃system direct drive servovalve

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