Abstract:A high frequency dynamic response characteristic analysis method is proposed to locate the debonded welding in lattice structures. The location of the defect is detected directly by measuring the local resonance responses. In numerical study, the high?frequency response of light lattice structure and the natural frequencies and mode shapes of lattice structure with multiple damages are analyzed. The results show obviously that there will be local resonance in the damaged areas. In the experimental verification, the broadband excitation method using piezoelectric patches is proposed. Combined with the full field measurement of scanning laser vibrometer, the frequency response function of the structure in the excitation frequency band is calculated. By analyzing the mode shapes corresponding to the peak frequency of frequency response function(FRF), the damage location can be identified accurately. The numerical and experimental results show that the modal parameter identification of the high frequency response characteristics of the lattice structures can effectively identify and locate the debonded welding defects.