Real-time identification and monitoring early warning method for vortex vibration event of large-span suspension bridge
A monitoring and early warning, suspension bridge technology, applied in measuring devices, measuring resonance frequency, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of inability to accurately perceive the occurrence and end of vortex vibration, inability to judge online in real time, and large judgment errors, etc. Achieve the effect of real-time early warning and online measurement of vortex vibration, high engineering application value, and high real-time performance
Active Publication Date: 2021-04-09
TONGJI UNIV
19 Cites 7 Cited by
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The invention discloses a real-time identification and monitoring early warning method for a vortex vibration event of a large-span suspension bridge. The method comprises the following steps: firstly, calculating a frequency spectrum of a bridge monitoring acceleration signal; determining a high-pass filtering cut-off frequency according to the bridge first-order frequency corresponding to the frequency spectrum first-order energy peak value, removing low-frequency noise interference in the signal through filtering, and calculating real-time vibration displacement of the bridge by adopting a recursive acceleration integration method; and carrying out real-time recursive Hilbert transform on the integral displacement data to obtain a real part and an imaginary part of signal data, and carrying out complex plane expression and evaluation on signals to realize vortex vibration identification and early warning. The method has the advantages of high real-time performance, high precision, accuracy and intuition; and the vibration characteristics of the bridge during vortex vibration are identified and measured online in real time, and vortex vibration early warning and online monitoring of the bridge are carried out.
Application Domain
Resonant frequency
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