Dynamic deformation monitoring of bridge structures based on GPS-RTK and accelerometers

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 69-73.

XIONG Chunbao1, LU Huali1, ZHU Jinsong1, YU Jiayong2

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Abstract

The real-time dynamic monitoring technology of the global positioning system GPS-RTK (Real-Time Kinematic) and accelerometers were used to monitor the dynamic deformation of Fumin Bridge in Tianjin.The sampling frequency of the RTK receiver was internally upgraded from 1Hz to 20 Hz.A joint monitoring device of RTK and an accelerometer was designed.In order to reduce the influence of multipath errors and random noise in RTK monitoring data, the AFEC hybrid filter (Autocorrelation Function based EEMD and Chebyshev) which was a combination of an autocorrelation function-based ensemble empirical mode decomposition (EEMD) filter and a Chebyshev filter was proposed.By filtering the data collected by RTK, the dynamic displacement of the bridge can be identified and compared with the displacement sequence obtained by integrating the acceleration data, and the results were basically consistent.It was shown that the AFEC filter can effectively weaken the multipath error and random noise in the RTK monitoring data. 

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dynamic deformation monitoring / GPS-RTK / accelerometer / AFEC hybrid filter

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XIONG Chunbao1, LU Huali1, ZHU Jinsong1, YU Jiayong2. Dynamic deformation monitoring of bridge structures based on GPS-RTK and accelerometers[J]. Journal of Vibration and Shock, 2019, 38(12): 69-73

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