An Operational Modal Parameters Identification Algorithm for Structures Based on HHT and RDT

WANG Mingjun; RAO Rui; YE Wanling; SU Zixi

doi:10.3724/j.gyjzG22122504

Volume 54 Issue 5

May 2024

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WANG Mingjun, RAO Rui, YE Wanling, SU Zixi. An Operational Modal Parameters Identification Algorithm for Structures Based on HHT and RDT[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(5): 43-50. doi: 10.3724/j.gyjzG22122504

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An Operational Modal Parameters Identification Algorithm for Structures Based on HHT and RDT

doi: 10.3724/j.gyjzG22122504

1. Guangzhou Central District Transportation Project Management Center, Guangzhou 510030, China;
2. Wind Engineering and Engineering Vibration Research Center, Guangzhou University, Guangzhou 510006, China;
3. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

Received Date: 2022-12-25
Available Online: 2024-06-22

Abstract

Abstract

An algorithm, utilizing the Hilbert-Huang Transform (HHT) and the random decrement technique (RDT), was proposed to enhance the precision and automation of identifying the modal parameters of structures under operational conditions. The algorithm involves the use of Fourier transform, Butterworth filter, empirical mode decomposition (EMD), random decrement technique (RDT), and Hilbert transform. Fourier transform and Butterworth filter were applied to obtain the dynamic responses of the target frequency range (DRTFR). EMD was employed to decompose the DRTFR into multiple intrinsic mode functions (IMFs). RDT was utilized to derive the free decay response signal of each IMFs. By subjecting the free decay response signals to Hilbert transform, phase curves and amplitude curves were generated. The slops of the phase curves and the amplitude curves were the frequencies and damping, respectively. The results showed that the proposed algorithm was suitable for processing both stationary linear signals and non-stationary non-linear signals. This algorithm exhibited superior accuracy and robustness compared to the fast Fourier transform (FFT) and HHT. It is recommended to use the intercept threshold of 1.2σ and the free decay duration of 75 seconds for processing the non-stationary non-linear signals.
- operational modal parameters,
- HHT,
- random decrement technique,
- intercept threshold,
- free decay duration

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References

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