Modal parametric identification of building structures based on VMD

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (1) : 175-183.

SUN Mengmeng1,ZHI Lunhai2，3

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Abstract

A key issue in health monitoring, control and condition assessment of building structures is correctly estimating their modal parameters including structural damping ratios, natural frequencies, etc. based on measured response signals. Here, a new structural modal parametric identification approach was proposed based on variational mode decomposition (VMD).With the proposed method, a measured vibration signal was decomposed using VMD to obtain various modal signals. Then, free decay response of each mode was obtained using NEXT technique. Finally, the direct interpolation (DI) method and the curve fitting one were used to estimate various modes’ natural frequencies and damping ratios. The numerical simulation for a 3-story frame structure was employed to verify the correctness and reliability of the proposed method. The measured acceleration response data of CITIC Plaza in Guangzhou under Typhoon Damrey were analyzed using the proposed approach. The estimated structural modal parameters were compared with those obtained using other recognition methods to further verify the correctness and reliability of the proposed method.

Key words

modal parameter identification / variational mode decomposition (VMD) / direct interpolation / damping ratio / natural frequencies / building structure

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SUN Mengmeng1,ZHI Lunhai2，3. Modal parametric identification of building structures based on VMD[J]. Journal of Vibration and Shock, 2020, 39(1): 175-183

References

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