Flexural-wave-generation using a phononic crystal with a piezoelectric defect

Defect-Band Splitting of a One-Dimensional Phononic Crystal with Double Defects for Bending-Wave Excitation

“…It effectively safeguards against structural influences while simultaneously providing clear insight into the intricate interplay between applied input voltages on individual piezoelectric defects and the resulting velocity amplitude of excited bending waves as they propagate outward. Furthermore, the previous study that investigates the efficacy of the PnC with double piezoelectric defects demonstrates that this specific symmetry configuration exhibits the most favorable performance in exciting longitudinal waves [25,27]. Note that in this scenario of defect introduction, an even number of N always results in a non-symmetric configuration.…”

“…For a comprehensive grasp of the intricate Comsol settings, a valuable reference, available in Refs. [25][26][27], can provide deeper insights and understanding. follows: the analyses are conducted within a two-dimensional spatial domain under the plane-stress condition.…”

“…These approaches account for single or double defects. Additionally, an initial analytical approach based on the fundamental Euler-Bernoulli beam theory has been introduced to showcase the bending-wave-excitation phenomenon and to improve its output performance compared to cases without defective PnCs [27]. In simulations, the velocity amplitude of generated bending waves is amplified nearly ten times.…”

“…The overarching goal here is to facilitate efficient operation at not just one, but two or potentially multiple frequencies by skillfully capitalizing on the distinct characteristics of defect-band splitting. This research is centered on two pivotal aspects: (i) developing an analytical approach to predict the wave-excitation performance of a PnC containing double piezoelectric defects via the Euler-Bernoulli beam theory [27] and (ii) confirming the enhancement of the output performance compared to scenarios in which the PnC is not present. The analytical approach under consideration is based on the transfer-matrix and scattering parameter methods, which are well-known mathematical techniques in circuit theory and waveguide modeling [28,29].…”