Gas Leakage Detection and Pressure Difference Identification by Asymmetric Differential Pressure Method  

作　　者：Yan Shi Jiaqi Chang Yixuan Wang Xuelin Zhao Qingzhen Zhang Liman Yang 

机构地区：[1]School of Automation Science and Electrical Engineering,Beihang University,Beijing 100191,China [2]Department of Musculoskeletal tumor,The Fourth Medical Center of PLA General Hospital,Beijing 100089,China [3]Senior Department of Orthopedics,The Fourth Medical Center of PLA General Hospital,Beijing 100089,China

出　　处：《Chinese Journal of Mechanical Engineering》2022年第2期150-158,共9页中国机械工程学报（英文版）

基　　金：Supported by the Youth Fund of National Natural Science Foundation of China(Grant No.52105044);National Key R&D Program of China(Grant No.2019YFC0121702);National Key R&D Program of China(Grant No.2019YFC0121703).

摘　　要：Currently,the measurement methods for pneumatic system leakage include bubbling,ultrasonic,and pressure detection methods.These methods are sensitive to high-precision sensors,long detection times,and stable external environments.The traditional differential pressure method involves severe differential pressure fluctuations caused by environmental pressure fluctuations or electromagnetic noise interference of sensors,leading to inaccurate detection.In this paper,a differential pressure fitting method for an asymmetric differential pressure cylinder is proposed.It overcomes the limitation of the detection efficiency caused by the asynchronous temperature recovery of the two chambers in the asymmetric differential pressure method and uses the differential pressure substitution equation to replace the differential calculation of the differential pressure.The improved differential pressure method proposes an innovation based on the detection principle and calculation method.Additionally,the influence of the parameters in the differential pressure substitution equation on the leakage calculation results was simulated,and the specific physical significance of the parameters of the differential pressure substitution equation was explained.The experiments verified the fitting effect and proved the accuracy of this method.Compared with the traditional differential pressure method,the maximum leakage deviation of inhibition was 0.5 L/min.Therefore,this method can be used to detect leaks in air tanks.

关 键 词：Leakage detection System identification Asymmetric tank PNEUMATICS MEASUREMENT Flow characteristics 

分 类 号：TB931[一般工业技术—计量学]