摘要
对含预制裂纹的压力管线进行液压疲劳试验,全程不间断地监测试验过程中产生的声发射信号,并对采集到的声发射信号的时程特性及其对应的频谱特性进行分析研究。结果表明,由裂纹扩展引发的声发射信号频谱集中在较低频带,由机械和摩擦等声源引起的声发射噪声信号频谱相对集中在较高频带。因此,通过声发射信号频谱分布特征可以识别声发射源的性质。
A coustic emission signals were monitored incessantly in the hydraulic pressure fatigue test on pressure piping with a prefabricated crack,and this paper focused on the characteristics analysis of acoustic emission signals in the time domain and its corresponding frequency spectrum.It is found that the acoustic emission signals caused by crack extending are mostly in the low frequency,and comparatively other AE signals caused by mechanical noise and friction are in the high frequency.The signals can be distinguished by frequency.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2010年第5期5-8,共4页
Nuclear Power Engineering
关键词
声发射
裂纹扩展
缺陷
频谱
Acoustic emission
Crack extending
Defect
Frequency spectrum
