多孔铝板高速撞击声发射定位方法

目前,声发射定位技术在空间碎片撞击航天器事件中的撞击源定位问题中得到了广泛研究。在定位算法上,声发射信号传播机理的复杂性表现为输入量的随机性;多次撞击的复杂性则表现为声发射信号传播的弯曲路径。文章针对多孔铝板声发射定位问题进行研究,采用伽马分布对声发射信号传播的弯曲效应进行建模,采用相对时间差方法对声源进行定位,最后通过仿真分析对所提供的模型与算法性能进行了数值演示。该方法可应用于空间碎片撞击航天器的撞击源定位与损伤评估。

Acoustic emission localization of hypervelocity impact in perforated plate

Acoustic emission localization technology is widely used to locate the impact source in the space debris impact. The propagation mechanism of acoustic signals in structures is very complex because of the complex characteristics of the structure itself and multiple impacts involved. The complexity of the propagation mechanism leads to the input randomness in the algorithm, while the complexity of multiple impacts leads to the curved path of the acoustic emission signal propagation. The acoustic emission localization of the space debris impacting on an aluminum alloy plate is discussed in this paper, and a bending effect model is established as Gamma distribution, which considered the randomness of the propagation path, and Delta-T method is employed to locate the acoustic source. A simulation is presented to demonstrate the capability of the model and the algorithm at last. The method proposed can be used for impact source location and damage assessment of space debris impacting.