一种基于时间反转的冲击定位方法

An impact location method based on time reversal concept

为实时、准确地实现航空航天结构中冲击定位,提出了一种基于时间反转、利用互相关函数成像处理的冲击定位方法。通过铝板结构低速冲击载荷定位的仿真和实验,利用基准脉冲响应数据库与未知冲击响应的互相关函数处理,取其峰值成像,定位冲击。结果表明该方法对结构中冲击定位简易、有效,并且对结构的先验知识不需要了解,适用于大型复杂结构的监测,为航空航天领域冲击在线监测提供参考方法.

To pinpoint the location of an impact event within aerospace structures in real time,an impact location method is proposed based on time reversal concept and using the cross correlation coefficients map.An aluminium plate is chosen as example in the simulation and experimental verification.The impact is identified by the maximum correlations between the impact response and the benchmark impulse response in the training data.It has been demonstrated that the impact location can be identified successfully with the simple processing.This method can be applied to the large complex structures and used as a reference method even for the on-line inspection within structures.