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On-line Access: 2022-05-10

Received: 2021-09-19

Revision Accepted: 2021-12-07

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Journal of Zhejiang University SCIENCE A 2022 Vol.23 No.4 P.286-302


Mechanism analysis and evaluation of thermal effects on the operating point drift of servo valves

Author(s):  Jian KANG, Zhao-hui YUAN, Jing-chao LI

Affiliation(s):  School of Automation, Northwestern Polytechnical University, Xi'an 710072, China

Corresponding email(s):   kangjian0926@mail.nwpu.edu.cn

Key Words:  Servo valve, Operating point drift, Mathematical model, Numerical analysis, Thermal effect

Jian KANG, Zhao-hui YUAN, Jing-chao LI. Mechanism analysis and evaluation of thermal effects on the operating point drift of servo valves[J]. Journal of Zhejiang University Science A, 2022, 23(4): 286-302.

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author="Jian KANG, Zhao-hui YUAN, Jing-chao LI",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Mechanism analysis and evaluation of thermal effects on the operating point drift of servo valves
%A Jian KANG
%A Zhao-hui YUAN
%A Jing-chao LI
%J Journal of Zhejiang University SCIENCE A
%V 23
%N 4
%P 286-302
%@ 1673-565X
%D 2022
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2100464

T1 - Mechanism analysis and evaluation of thermal effects on the operating point drift of servo valves
A1 - Jian KANG
A1 - Zhao-hui YUAN
A1 - Jing-chao LI
J0 - Journal of Zhejiang University Science A
VL - 23
IS - 4
SP - 286
EP - 302
%@ 1673-565X
Y1 - 2022
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2100464

operating point drift over large temperature spans can significantly degrade the performance of servo valves. The direction and magnitude of the deviation of the operating point are uncertain. To analyze and evaluate the mechanism of this complex system with a multi-level structure and multi-variables, it is necessary to construct a theoretical model with a clear physical concept to describe it. However, since the physical processes contain complex variations of structural parameters and flow properties, there is a problem of simplifying approximations in deriving analytical mathematical relations. The advantages of multi-physics field numerical analysis can compensate for this shortcoming of analytical formulations. Based on this, we constructed a whole-valve transfer function model to realize the mechanism analysis and evaluate the operating point drift when a thermal effect acts on a servo valve. The results show that the asymmetric fit relationship between the armature-nozzle assemblies is an important reason for the drift of the operating point caused by the thermal effect. Differences in structural parameters and fluid medium characteristics at different temperatures lead to nonlinear changes in the operating point. When the deviation angle reaches ±1°, an increase in temperature will cause the absolute value of the tangent slope of the displacement deviation of the spool to decrease from 1.44×10-5 m/°C to 1.25×10-6 m/°C. The influence of the deviation angle is reflected in the change in the absolute value of the tangent slope of the pressure deviation from 1.14×103 Pa/°C to 110 Pa/°C.


结论:1.衔铁-喷嘴组件之间的不对称配合关系是热效应引起工作点漂移的重要原因。2.不同温度下结构参数和流体介质特性的差异可导致工作点非线性变化。3.当偏差角达到±1°时,温度升高会导致阀芯位移偏差的切线斜率绝对值从1.44×10?5减小到1.25×10?6m/°C;偏差角的影响体现在压力偏差的切线斜率绝对值从1.14×103Pa/°C到110 Pa/°C的变化。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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