基于声发射的阀门泄漏检测及标定方法的研究

基于阀门泄漏产生声发射信号的原理,建立了可用于测试阀门泄漏率低于0.1Pa.m3/s的微小泄漏状态的声发射检测系统,采用气泡法对阀门微小泄漏进行标定。针对声发射信号在检测中易受环境噪声干扰的问题,设计了信号调理电路来降低各种噪声,并编制了LabVIEW程序对采集的声发射信号进行分析和处理。以手动球阀为被测对象,在建立的系统上进行了大量泄漏检测实验,结果表明,该系统能快速方便地对阀门微小泄漏做出定性分析。

Valve leak testing and leakage rate calibration based on acoustic emission

A valve leakage rate measurement system was built using Acoustic Emission(AE)method based on the principle of valve leakage generating AE signals,which could be used to test valve leakage lower than 0.1Pa·m3/s,and used air bubble method to calibrate the system.For the signal detection problem of susceptible to environmental noise,the conditional circuit was designed to reduce the effect of noise,and a LabVIEW program was compiled to analyze and process the capturing AE signals.In the established system,a manual ball valve was used as measured object and a large number of experimental results showed that the system could make qualitative analysis quickly and easily for tiny leak on the valve.