High-velocity Impact Location on Aircraft panels Using Macro-fiber Composite piezoelectric Rosettes

摘要

In this article, an approach based on an array of macro-fiber composite (MFC)udtransducers arranged as rosettes is proposed for high-velocity impact location on isotropic andudcomposite aircraft panels. Each rosette, using the directivity behavior of three MFC sensors,udprovides the direction of an incoming wave generated by the impact source as a principaludstrain angle. A minimum of two rosettes is sufficient to determine the impact location byudintersecting the wave directions. The piezoelectric rosette approach is easier to implement thanudthe well-known time-of-flight-based triangulation of acoustic emissions because it does notudrequire knowledge of the wave speed in the material. Hence, the technique does not have theuddrawbacks of time-of-flight triangulation associated to anisotropic materials or tapered sections.udThe experiments reported herein show the applicability of the technique to high-velocityudimpacts created with a gas-gun firing spherical ice projectiles.