Analysis on whistle of pressure servo-valve based on oil-return resistance

doi:10.3785/j.issn.1008-973X.2019.11.005

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (11): 2085-2091 DOI: 10.3785/j.issn.1008-973X.2019.11.005

Mechanical Engineering

Analysis on whistle of pressure servo-valve based on oil-return resistance

He-ran ZHANG1(

),Xiao-ping OUYANG1,*(

),Sheng-rong GUO2,Yu-long LIU2

1. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
2. Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, AVIC Jincheng Nanjing Engineering Institute of Aircraft System, Nanjing 211100, China

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Abstract

Simulation and experiment analyses were conducted on the whistle of the pressure servo-valve, and it was verified that the increase of the oil return resistance of the valve spool would cause whistling. A complete simulation model of the pressure servo-valve was built based on the electromechanical system analysis software, AMESim platform. The validity of the simulation model was verified by comparing the dynamic and static characteristic curves of the test and the simulation model. The effect of oil return resistance at different valve spool levels on the oscillation amplitude in spring tube in armature assembly were analyzed. The conditions and essential causes of self-excited oscillation were explored. The transmission path of internal oscillation of the servo valve was analyzed. Results show that the change of the oil return resistance of the servo valve spool will cause the self-oscillation of the torque motor armature assembly, and the oscillating howling of the servo valve can be avoided by reasonable optimization of the oil return gap of the valve spool. By increasing the chamber volume between the valve spool and the nozzle, the oscillation transmission path can also be cut off to eliminate the oscillating howling of the servo valve.

Key words： pressure servo-valve whistle self-excited oscillation oil-return resistance AMESim

Received: 12 June 2018 Published: 21 November 2019

CLC:

TH 137

Corresponding Authors: Xiao-ping OUYANG E-mail: heran@zju.edu.cn;ouyangxp@zju.edu.cn

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Cite this article:

He-ran ZHANG,Xiao-ping OUYANG,Sheng-rong GUO,Yu-long LIU. Analysis on whistle of pressure servo-valve based on oil-return resistance. Journal of ZheJiang University (Engineering Science), 2019, 53(11): 2085-2091.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.11.005 OR http://www.zjujournals.com/eng/Y2019/V53/I11/2085

基于回油液阻的压力伺服阀啸叫分析

对压力伺服阀的啸叫问题进行仿真与试验分析，验证了滑阀级回油液阻增大会引起伺服阀啸叫. 基于机电系统分析软件AMESim建立压力伺服阀完整的仿真模型，对比分析仿真与试验的动静态特性曲线，验证仿真模型的正确性. 分析滑阀级不同的回油液阻对衔铁组件中弹簧管振荡幅值的影响；剖析产生自激振荡的条件和本质原因；探究伺服阀内部振荡的传递路径. 研究发现，伺服阀滑阀级回油液阻的变化，会引起力矩马达衔铁组件的自激振荡，通过合理优化滑阀阀芯回油间隙可以避免这部分伺服阀振荡啸叫；通过增大滑阀至喷嘴腔容积也可以切断振荡传递以消除伺服阀振荡啸叫.

关键词： 压力伺服阀, 啸叫, 自激振荡, 回油液阻, AMESim

Fig.1 Schematic diagram of pressure servo-valve

Fig.2 Model diagram of pressure servo-valve

Fig.3 Test rig for dynamic and static performance of pressure servo-valve

Tab.1 Parameter of pressure servo-valve

Fig.4 Comparison of simulation and test results of input current and output pressure curve

Fig.5 Frequency characteristic curve of pressure servo-valve

Fig.6 Schematic diagram of servo spool valve core structure

Fig.7 Displacement curve of baffle in armature assembly

Fig.8 Oscillating amplitude of armature component with different oil return gaps

Fig.9 Noise spectrum diagram of servo-valve with different oil return gaps

Fig.10 Hydraulic dynamic curve of spool valve core

Fig.11 Displacement variation curve of spool valve core

Fig.12 Pressure change curve of nozzle chamber with different oil return gaps

Fig.13 Displacement curve of baffle under condition of armature assembly oscillation

Fig.14 Pressure variation curve of servo-valve chambers


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