Table 8: Comparison of modal frequencies by ANSYS modeling and FDD of the responses of experimental specimens under random excitation.

1st bending 2nd bending 1st bending/torsion 3rd bending

0% delaminatedANSYS (Hz)31.4669.1381.68165.80
FDD (Hz)31.7768.0383.04166.08

22.2% delaminatedANSYS (Hz)27.3851.9965.6391.71
FDD (Hz)27.0150.7791.79

51.9% delaminatedANSYS (Hz)26.9850.8165.2796.99
FDD (Hz)27.5154.5396.80

74.1% delaminatedANSYS (Hz)24.9142.7860.4781.39
FDD (Hz)24.0144.7784.54