二次碎片云超高速撞击声发射源时序特性

The Time Sequence Characteristics of AE Source Induced by Debris Cloud

空间碎片击穿防护屏产生二次碎片云撞击密封舱舱壁形成大量点状声发射源,这些点状声发射源的集合构成了二次碎片云超高速撞击声发射源。为探究其时序特性,通过引入Corvonato二次碎片云模型,分析了点状声发射源的产生时序及其所发信号的传播时序,提出了"时序最速点"概念用于表征此类声发射源;分析了时序最速点、撞击中心和传感器三者间的相对位置关系,在此基础上提出了时序最速环概念,并通过试验证明了时序最速环概念。结论对发展二次碎片云超高速撞击声发射源定位技术具有重要意义。

Orbital debris penetrating the shield panel would create secondary debris cloud.The latter shall impact the module wall and will create a mount of punctuate AE source.By introducing the Corvonato debris cloud model,the impact sequence of the particles and the propagation characteristics of the signals emitted by punctuate AE source have been analyzed.A concept of most fast point was presented for representing debris cloud AE source;then based on the wave velocity of the module wall,on the relative position of the impact center and on the fastest point and sensor,a concept of fastest ring was proposed.The conclusion of this paper has important significance in study of the method for locating acoustic emission source induced by secondary debris cloud.