声发射技术在管道泄漏检测中的应用

传统的管道泄漏检测法如负压波诊断法要求有很强的实时性,常因不能及时捕捉到泄漏信号而造成诊断失败,而声发射检测技术作为一种成熟的无损检测方法,可根据泄漏时流体与泄漏孔隙产生的声发射信号判断泄漏,实现对泄漏信号的连续捕捉,在检测原理上有很大的优势。利用声发射技术对管道泄漏检测进行了试验研究,通过对声发射信号进行时频域分析,实现了对泄漏信号的有效识别。试验结果表明,泄漏发生时的声发射能量主要集中在140-160 kHz,随着泄漏距离的增加,在200 kHz处的声发射能量将产生较大的衰减,从而验证了应用声发射技术进行管道泄漏检测的可行性。

Application of acoustic emission technique in pipeline leakage detection

The traditional pipeline leakage detecting method such as negative pressure wave detecting method requires a strong real time ability, and often cannot diagnose the leakage due to failing to catch the leakage signal in time. Acoustic emission technique as a ripe nondestructive detecting technique can catch the leakage signal continuously according to the acoustic emission signal between the fluid and the leakage hole, and is of most advantage in theory of detection. The acoustic emission technique was used in pipeline leakage detection by the laboratory research. Thetime-frequency attribute of the leakage acoustic emission signal was analyzed. The results show that main energy of leakage signal concentrates at 140 - 160 kHz. With the increase of leakage distance, considerable energy attenuation comes out at 200 kHz. The results verifies the feasibility of using acoustic emission technique in pipeline leakage detection.