基于二维波束聚焦算法的低速冲击监测研究

Low speed impact monitoring based on 2-D beam focusing algorithm

冲击损伤监测是结构健康监测的主要研究内容之一,为提高冲击定位的精度以及传感器的利用效率,提出了一种基于十字阵列型传感器布置方法的二维波束聚焦冲击定位算法,在高精度的前提下有效减少了传统定位方法所需布置的传感器数量。通过十字阵列型的压电传感器布置方法,可以将远场的定位精度大大提高,对于内场的盲区采用四点圆弧定位算法进行冲击定位,从而将整个大型平板结构的冲击定位精度大大提高。通过实验研究验证了该方法的有效性与实用性。

Impact damage monitoring is one of main research contents of structural health monitoring.In order to improve the accuracy of impact localization and the efficiency of sensor utilization,a 2-D beam focusing impact locating algorithm based on cross array sensor arrangement was proposed here.Under the premise of high precision,the number of sensors required by the traditional locating method was effectively reduced.With the method of cross array type piezoelectric sensor arrangement,the locating accuracy of the far field was greatly improved,and the 4-point arc locating algorithm was used for impact locating of the blind zone of the inner field,therefore,the impact locating precision of a whole large-scale plate structure was greatly improved.The effectiveness and practicability of the proposed method were verified with tests.