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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Mechanical and Electrical Engineering     
Study of leakage flow in piston based on principle of capacitance micrometer
ZHU Xiao, TAO Guo liang
State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
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Abstract  
A new method for leakage modeling of the pressurized frictionless cylinder was proposed to satisfy the critical conditions which concern the large leakage flow and the non contact requirement in measuring process. A measuring device based on highly accurate flow measurement system was designed to analyze the relationship between the supply pressure, air consumption and the capacitance of the eccentric cylindrical capacitor composed of the outer cylindrical surface of the piston and the inner wall of the cylinder tube. The experimental results indicate that the significant relationship between the capacitance and the eccentricity of the piston can be used as an indirect means of the study on the piston eccentricity, and can be used as a working state indicator of the cylinder. A new off line mathematic model of cylinder leakage was constructed based on the experimental results. The modeling work can be simplified and the accuracy can be ensured by avoiding the direct measurement of piston eccentricity

Published: 01 April 2016
CLC:  TH 138  
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Cite this article:

ZHU Xiao, TAO Guo liang. Study of leakage flow in piston based on principle of capacitance micrometer. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(4): 609-615.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.04.003     OR     http://www.zjujournals.com/eng/Y2016/V50/I4/609


基于电容测微原理的气缸活塞泄漏研究

针对气浮无摩擦气缸的活塞泄漏流量大且难以直接建模的特点,提出基于电容测微原理的活塞耗气量建模方法.以活塞外圆柱面与缸筒内壁构成的偏心圆柱电容器的电容为研究对象,以高精度的流量测试系统为基础,设计一套测量装置,研究气体轴承在单侧供气的情况下电容与供气压力及耗气量之间的关系.结果表明,活塞在缸筒内的偏心与电容呈现出显著的函数变化规律,可以作为研究活塞偏心的间接手段,提出活塞工作状态的指示变量及实现方法；以电容作为衡量活塞偏心的手段,以实验数据为基础建立供气压力与耗气量的离线数学模型,在保证精度的基础上避免了对活塞偏心直接测量,简化了建模工作
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