Optimization for Collocation of Sensors in Active Lamb Wave-based Monitoring
Shenfang Yuan · Acta Aeronautica Et Astronautica Sinica · 2006
The propagation characteristics of Lamb waves in composites are researched.Actuation signals with different central frequencies are used to excite composite plate.According to the response of Lamb wave signals,it is applicable to optimize the location of sensors for each other to prevent the superimposition of different modes of Lamb waves and produce the single mode for the convenience of analyzing.Also,according to the arrival time of border reflection,which can be obtained by the calculated group velocity of S_0 mode of Lamb wave,the collocation optimization of sensors for resisting the disturbing of border reflection can be realized.It can be validated that the calculated arrival time of border reflection agreed well with the real.Based on the optimization for collocation of sensors,to suppress the superimposition of different modes and delay the arrival time of border reflection,the localization of delamination in composite is accomplished with the produced single mode signals.