主要通过介绍两台压力容器密封失效泄漏的声发射检测案例, 分析了压力容器密封失效泄漏时声发射信号特性。检测结果显示当泄漏介质为液体时, 密封失效泄漏信号为幅度较低的连续型信号, 中心频率约为10~50 kHz; 当泄漏介质为气体时, 泄漏信号为幅度较高突发型信号占优的混合型信号, 中心频率约为100~400 kHz, 此类信号能通过时差定位方法实现定位。检测结果为类似压力容器泄漏声发射检测提供了参考。

Two cases of acoustic emission test on leak were done and the signals characters were analyzed . The results indicated that when the leak mediums were liquid, the acoustic emission signals were continuous signals with low amplitude and the center frequency was about 10~50 kHz; when the leak mediums were gas, the acoustic emission signals were mixed signals with the burst signals being predominant and the center frequency being about 100~400 kHz, and the kind of leaks could be located by Time of Arrival location methods. The research results provided references for similar acoustic emission tests on pressure vessel leak.