Combining the time-frequency mask technique and fuzzy C-mean clustering,a new method of modal parameter identification for structural operation is proposed.The method establishes a time-frequency mask based on the energy information of the structural vibration response,solves the structural modal response by the time-frequency mask,and identifies the modal frequencies and damping ratios from the modal response by adopting the single-degree-of-freedom modal parameter identification technique.The time-frequency coeffi-cients at the energy peak of the structural vibration response are sequentially extracted,and after single-source point detection,they are clustered by fuzzy C-mean clustering,and the first cluster center is taken as the modal vibration mode.The effectiveness of the proposed method is verified by numerical cases and frame structure tests.The results show that the proposed method has good modal parameter identification accuracy and noise robustness.
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