Launch Vehicle Pipeline Micro Leakage Acoustic Emission Detector

The airtightness of the rocket pipeline system directly affects the safety of the rocket. Soap bubble method as the airtight detection traditional method has been used for a long time, difficultly confirmed the position and easy to make misjudgment. We developed a portable acoustic system that is convenient and accurate to detect the leakage of the rocket pipelines with a novel algorithm in it. Firstly, a portable acoustic system is constructed after choosing the suitable component of the detecting system. Secondly, the leakage detection experiment was carried out to analyze the time-domain and frequency-domain characteristics of the leakage signal, and the results showed that there is a relation between the leakage rate and the envelope area of frequency. Finally, an algorithm that identified the leakage level is proposed, and it is reliable and accurate to judge the rocket pipelines leakage level. The experiment results show the new acoustic emission detection system can make a more efficient and accurate assessment of the leakage level.