高技术通讯2025，Vol.35Issue(1)：85-92,8.DOI:10.3772/j.issn.1002-0470.2025.01.009
基于MVH的气动调节阀气室漏气在线故障诊断
Online fault diagnosis of air chamber leakage in pneumatic control valve based on MVH
摘要
Abstract
Air chamber leakage is one of the typical common faults of pneumatic control valves.Although many fault di-agnosis methods have been proposed,most of them are based on steady-state situations with unchanged operating conditions.However,in practical applications,operating conditions change with the requirements of working condi-tions,and these methods cannot meet the needs of online fault diagnosis.This paper proposes an online fault diag-nosis method for detecting air chamber leakage in pneumatic control valves based on multi-variable histogram(MVH).The explanatory variable is the set value of the valve position,while the observed variable is airchamber pressure,establishing the MVH reference model and the real-time model,with the output of the model being the distribution of the observed variables corresponding to the explanatory variables.At this time,the fault can be re-garded as a change in the distribution of the observed variables.By contrasting the threshold of output distribution change between reference and real-time models,the severity and occurrence of air chamber leakage can be deter-mined in real-time.The effectiveness of this method has been verified through the Simulink simulation platform and real experiment data.关键词
气动调节阀/气室漏气/在线故障诊断/多变量直方图模型Key words
pneumatic control valve/air chamber leakage/online fault diagnosis/multi-variable histogram model引用本文复制引用
丁栋杰,尚群立..基于MVH的气动调节阀气室漏气在线故障诊断[J].高技术通讯,2025,35(1):85-92,8.基金项目
国家科技重大专项(2018ZX06005002)资助项目. （2018ZX06005002）
