Valve internal leakage detecting method based on sonic wave sensors

Abstract

The invention discloses a valve internal leakage detecting method based on sonic wave sensors. The method comprises the following steps that W point first sampling signals, detected by the valve upstream sonic wave sensor, of first sonic wave signals inside a pipeline and W point second sampling signals, detected by the valve downstream sonic wave sensor, of second sonic wave signals are obtained, wavelet packet decomposition is carried out on the first sampling signals and the second sampling signals through first preset dimension and second preset dimension, and first wavelet packet entropy of the first sampling signals and second wavelet packet entropy of the second sampling signals are calculated; whether internal leakage of a tested valve occurs or not is determined by comparing the first wavelet packet entropy with a first preset wavelet packet entropy threshold value and comparing the second wavelet packet entropy with a second preset wavelet packet entropy threshold value. By means of the method, a traditional high-frequency acoustic emission sensor is not needed, the high real-time performance requirement and the complexity degree of signal processing in judgment of internal leakage of the valve are greatly lowered, the computing workload and the memory demand quantity are greatly reduced, and engineering implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a valve internal leakage detection method based on an acoustic wave sensor. Background technique [0002] As a general mechanical product, valves are widely used in various sectors of the national economy. As the control device of the fluid pipeline, the basic function of the valve is to connect or cut off the circulation of the pipeline medium, change the flow direction of the medium, adjust the pressure and flow of the medium, and protect the normal operation of the pipeline and equipment. For most valves, internal leakage is the most important form of damage, and it is also the primary problem affecting the safe operation of valves. Due to the poor sealing performance of the valve or the short sealing life, the leakage or internal leakage of the fluid will not only cause the pressure loss of the system, the waste of the fluid, but also bring disasters to the leakage of corr...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a valve leakage detection method based on an acoustic sensor with low valve leakage detection cost and high detection accuracy in view of the high cost of valve leakage detection equipment and complex problems in the traditional technology.

Images