| Citation: | ZHAO Q，FENG K. Noncontact damage imaging method in lattice sandwich structures[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（1）：206-211 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0194
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Aiming at the damage problems such as debonding of lattice sandwich structure, a non-contact damage imaging technology based on high-frequency dynamic response is proposed. The high-frequency response of the structure is analysed according to the non-baseline damage index to realize debonding damage imaging. In the numerical simulation, based on the local resonance theory, the low-order natural frequency of the damage area is used as the centre frequency to calculate the response of the structure in a wide frequency range under sound field excitation, and the damage imaging is realized by using no baseline damage index. The damage imaging results can accurately identify the damage location; In the test, the non-contact test measurement scheme of using the loudspeaker to excite, and the laser vibration measurement system to pick up the full-field mode shape during scanning successfully identified the location of the debonding damage. The applicability and feasibility of the non-contact imaging technology for the damage detection of the dot matrix sandwich structure debonding is verified, and the damage identification without additional structural quality and without health reference signals is realized.
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