To realize the damage diagnosis of a optical fiber grating smart structure

the structual dynamic response signal was decomposed with the wavelet analysis method based on the vibration monitor of optical fiber grating smart structure.The wavelet packet decomposition was introduced

and the wavelet packet energy spectrum describing the damage character was used to identify the structual damage status. Then

six different damage circs were studied by experimental laminates

inculding the different degrees and the same location of structure damage

and different locations and the same degree of structure damage. The results show that the structure damage will lead to the increase of wavelet energy spectrum of some specifically frequency bands of the structure dynamic response signal

and the damage characters are sensitive to the damage degree

damage location and the degree from the damage to the sensor. In the experiment

this method can recognize the damage of 12 g weights and 30 cm from the optical fiber grating sensor

it is feasible to realize the structure on-line damage diagnosis.