阀门内漏声波监测及其信号特征提取方法

Acoustic monitoring and signal feature extraction for valve internal leakage

针对管道阀门内漏故障,提出了一种采用双传感器结构的阀门内漏非介入式声波监测方法。设计了能够调节传感器和管壁的接触程度并锁紧,且可实现快速装卸的传感装置。分析比较了阀门正常与阀门内漏、管道敲击、阀门开启和关闭状态下启泵等干扰声波信号的时频域特征,提出了基于小波包能量分率的阀门内漏声波信号特征提取方法,有效区分了阀门内漏和外部干扰。该方法具有较高的泄漏检测灵敏度,可大大降低信号采样频率及阀门内漏诊断的难度。

A non-intrusive acoustic monitoring method for valve internal leakage was proposed using a dual-sensor structure. The sensing device was designed to be able to adjust contact level between sensor and pipe wall and lock them,and it could be loaded and unloaded quickly. The time-frequency domain features of interference acoustic signals sampled under the conditions of valve normal state,valve internal leakage,pipe tapping,pump starting during valve being in open or close state were analyzed contrastively. The feature extraction approach based on the wavelet packet energy ratio for valve internal leakage acoustic signals was proposed. It was shown that this method can effectively distinguish valve internal leakage and external interferences; it has a higher leakage detection sensitivity,it can greatly reduce the sampling frequency and the difficulty degree of valve internal leakage diagnosis.