In order to verify the effectiveness of the SFRF index for the damage identification, experimental tests using steel plate was conducted.
The SFRF amplitude of 60 Hz can be obtained by calculating the ratio between the peak values of Fourier form of the wavelength response and the time domain force, similarly other SFRF amplitudes in the sweep frequency range can be obtained, connecting all the SFRF amplitude points into line makes the strain frequency response function curve.
The SFRF curves received from FBG at L3 was plotted in Fig.
10 shows the histogram of SFRF index at measuring locations.
Also, the relationship curves between the damage severity and the SFRF index can be used for damage severity determination.
sfrf] index calculated from SFRF of measurement points, it is verified that the index [[beta].