摘要
声发射现象中产生的弹性波在传播时声压遵从指数衰减规律,文中提出一种利用声衰减特性对声发射源进行平面定位的能量定位新方法。从理论上导出了该方法的定位计算公式,并用AE21C型声发射仪在高分子合成纤维平板上以铅笔芯折断产生信号为模拟源进行了实验测量,证明这种新的源定位方法可行,并具有无须测量传声媒质的声衰减和声速等优点。
A new method of energy location for acoustic emission source is proposed by using the acoustic attenuation property based on the exponential attenuation rule for elastic waves propagation in the acoustic emission. The equation is derived, and experiment measurements using signals of pencil core fracture as the source conducted in a plane of high polymer synthetic fiber. Feasibility of the new source location method is confirmed. The method does not need measurement of the attenuation property of the medium and the sound speed.
出处
《声学技术》
CSCD
北大核心
2006年第2期107-109,共3页
Technical Acoustics
基金
国家自然科学基金资助项目(50075010)
关键词
声发射
声衰减
源定位
能量
acoustic emission
acoustic attenuation
source location
energy
