Identification of time-varying cable force based on an improved multisynchrosqueezing transform

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 212-219.

LIU Xun1,ZUO Weidong1,2,YNAG Ning1,LIN Kaiqi1,2

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Abstract

Identification of time-varying cable force is an important content of structural condition evaluation and health diagnosis of a cable-stayed bridge. However, this problem has not been well solved by now. Based on the improved multisynchrosqueezing transform and efficient ridge extraction algorithm, a new method for time-varying cable force identification of stay cables is proposed in this paper. Firstly, the time-frequency spectrum is obtained by using the vibration acceleration response of the cable, and then the time-frequency ridge in the time-frequency spectrum is extracted to obtain the instantaneous frequency of the cable. Finally the time-varying cable force is calculated according to the tension string theory. The applicability and precision of the method are verified by a typical numerical case of cable-stayed bridge and a cable tests. The results show that:in the numerical case, under the noise level of 10%, the average error of time-varying cable force identification is less than 1.99%, and the maximum error is 5.09%; in the test, the average error of time-varying cable force identification is less than 2.52%, and the maximum error is 8.77%. The preliminary verifying results prove that the proposed method has good identification accuracy and noise robustness.

Key words

structural health monitoring / stay-cable / time-frequency analysis / time-varying cable force / synchrosqueezing transform

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LIU Xun1,ZUO Weidong1,2,YNAG Ning1,LIN Kaiqi1,2. Identification of time-varying cable force based on an improved multisynchrosqueezing transform[J]. Journal of Vibration and Shock, 2023, 42(12): 212-219

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