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NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: EU PhD Programme "NDT on Air" (Special Session)

Improved shear horizontal wave piezoelectric fiber patch (SH-PFP) for structural health monitoring applications

Yongtak KIM2, Bernd Köhler49
Branch Lab Dresden; Fraunhofer Institute for Ceramic Technology and System (IKTS)230, Dresden, Germany

Abstract: Controlling the wave directivity of transducers is an important aspect of guided wave based structural health monitoring (SHM), because a strong directivity is not only energy efficient but also has an advantage of simple signal analysis. The fundamental shear horizontal (SH0) wave is gaining its popularity due to its non-dispersive characteristics. Piezoelectric fiber patches (PFP) are lightweight, thin, and flexible and therefore adaptable to curved surfaces. PFP can be designed to preferentially generate and receive either Lamb or shear horizontal guided waves. Building on previous work for a SH-PFP transducer [1] its geometry is modified to optimize the mode purity and the directivity. Finally, a new version of SH0 wave PFP with improved directivity is proposed. The new transducer concept and its working principles are explained, and the numerical simulation is conducted to validate its performance. Results show that the new transducer can generate almost pure SH0 waves along the desired direction with high directivity.

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