Diagnosis of Valve Leakage Fault Patterns Based on Acoustic Emission Detection

To realize visual and accurate diagnosis of valve leakage faults, the flow field around leakage holes and the energy calculation on fluid in the flow field were analyzed under typical leakage patterns, by integrating theory with practice and classifying common leakage patterns in engineering practice. Simulation experiments were carried out to study the valve leakage of different patterns, during which corresponding acoustic emission signals were analyzed using wavelet packet technology, and subsequently the variation laws of leakage acoustic emission energy with leakage pattern were obtained. Results show that the energy ratio in each sub-band of acoustic emission signals differs regularly for valve faults of different patterns. The diagnosis criteria may serve as a reference for visualized detection of valve faults.