The high-lift devices of civil aircraft wings and the acoustic linings of engines are subjected to noise loads and high temperatures. To understand the typical vibration characteristics of local composite panel honeycomb sandwich structures under these conditions, a study on modal testing methods in high-temperature environments is necessary. To address this issue, various independent modal tests were conducted using impact hammer excitation, transient excitation, pulse sequence excitation, and random noise excitation methods. The results obtained from these methods were compared with those from the impact hammer excitation method to verify the advantages and disadvantages of each method and to identify the optimal modal testing method for high-temperature environments. The results show that all four methods—impact hammer excitation, transient excitation, pulse sequence excitation, and random noise excitation—can yield reasonable and effective modal measurement results.

Chao Qu, Qun Yan, Xuefeng Zou, Dingwen Gou, Xingqiang Liu. Experimental Study on Modal Testing Methods for Typical Composite Honeycomb Sandwich Structures. International Journal of Frontiers in Engineering Technology (2024), Vol. 6, Issue 5: 13-24. https://doi.org/10.25236/IJFET.2024.060503.

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