Fig. 2: Transmission characteristics of the asymmetric groove (AG) and the symmetric grooves (SGs).
From: Unidirectional focusing for broadband Lamb guided wave based on mode conversion
a Time-domain wavefront of S0-mode Lamb wave propagating in a plate with an AG, as schemed by the inset. The blue short dashed and red solid lines denote for the in-plane and out-of-plane displacements, respectively. b Transmission spectrum of the AG for A0 mode. The inset shows the displacement distribution at 55 μs. c The band structure of the SG, where the insets show the total displacement at 490.2 kHz and 328.5 kHz, respectively. The red solid line and blue short dashed line, respectively, represent the energy bands of the SG for A0- and S0-mode Lamb waves. d The transmission spectra of incident S0 (blue short dashed line) and A0 (red solid line) modes wave passing through the SG. e Out-of-plane displacements of A0- and S0-mode Lamb waves at 320 kHz.
