Fig. 4
From: Double defects-induced elastic wave coupling and energy localization in a phononic crystal
The degree of the defect band splitting is observed to decrease with increasing distance between the double defects in both simulation and experiment. a–c Numerical simulation results of the normalized out-of-plane displacement frequency response functions for three cases of double defects (4, 7), (4, 8), and (4, 9), respectively. d–f Experimental results of the normalized out-of-plane displacement frequency response functions for three cases of double defects (4, 7), (4, 8), and (4, 9), respectively