摘要
作为飞控系统的关键部件之一,电液伺服阀的特性与可靠性直接关乎飞行性能与安全。直驱阀因构造简单、抗污染能力强、输出功率大等突出优势成为近年来的研究热点。针对一种新型双系统直驱伺服阀的阀芯振荡问题,认为阀口空化引起阀腔凸肩面压力脉动是阀芯振荡的主导因素。基于气液两相数值模拟研究了近阀口空化与压力分布特征,揭示了空化与阀芯振荡的机理;建立了双阀芯的动力学模型,典型工况下阀芯所受流体力和位移振荡仿真结果与实验数据基本吻合,验证了所提方法的可靠性。结果表明,阀杆长径比与阀口节流级数对阀芯振荡有较大影响。回油腔阀杆长径比减小18%,可使振荡幅值削减约67%,为抑制双系统直驱伺服阀振荡提供了理论参考。
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.
作者
王彬
任鹏达
张伟
谢志刚
张文星
Bin WANG;Pengda REN;Wei ZHANG;Zhigang XIE;Wenxing ZHANG(Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;AVIC Xi’an Flight Automatic Control Research Institute,Xi’an 710076,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2023年第5期279-291,共13页
Acta Aeronautica et Astronautica Sinica
基金
航空科学基金(201907052001)。
关键词
双系统直驱伺服阀
阀芯振荡
空化
凸肩面
抑制
dual-system direct drive servovalve
spool oscillation
cavitation
ring surface
suppression
