夹套结构内管泄漏声发射检测与评价方法

Acoustic Emission Testing and Evaluation Method for the Inner-Pipe Leakage of Jacketed Structure

由于夹套结构的遮蔽性,其内管泄漏很难及时发现。采用声发射检测技术,利用其实时性、高灵敏度等特点对夹套结构内管泄漏进行检测。构造了一个用于评价夹套内管泄漏的新的声发射参量,以提高评价的准确度。通过开展内管泄漏模拟试验,对传统声发射参量与新参量评价效果进行了对比,结果表明新参量评价效果更准确。同时,采用互相关定位方法对夹套结构模拟泄漏点进行了定位,定位结果误差低于10%。结果表明,新构造的参量能准确地对泄漏强度进行评价,互相关定位可以确定内管泄漏的位置。

Jacketed structures inner-pipe leakage is difficult to discover the leakage due to the structure of the cover.In this paper,the acoustic emission testing technology is used in the jacketed structure inner-pipe leakage detection because of its real-time performance and high sensitivity,etc.A new acoustic emission parameter was constructed and used for assessment of jacketed pipe leakage in order to improve the evaluation accuracy.By comparing the traditional acoustic emission evaluation effect parameters with the new parameter through the innerpipe leakage simulation experiment,it was shown that the new parameter evaluation results were more accurate.Cross-correlation positioning method is applied to simulated leak positioning of jacketed structure,position error is less than 10%.The results show that the new parameters can accurately evaluate the leakage intensity,and the cross-correlation positioning method can locate the inner-pipe leakage.