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Structural Engineering and Mechanics
  Volume 79, Number 6, September25 2021 , pages 683-697
DOI: https://doi.org/10.12989/sem.2021.79.6.683
 


Modal parameter estimation of civil structures based on improved variational mode decomposition
Lun-hai Zhi, Feng Hu, Chunfeng Zhao and Jingfeng Wang

 
Abstract
    This paper proposes an improved variational mode decomposition (IVMD) algorithm for structural modal parameter estimation based on non-stationary responses. In this improved VMD, the mean envelope entropy (MEE) and particle swarm optimization (PSO) are first employed to determine the optimal decomposition parameters for the subsequent VMD analysis. Then the VMD algorithm is used to decompose the non-stationary data into a number of intrinsic mode functions (IMFs). After obtaining the IMFs based on the IVMD, structural modal parameters such as natural frequencies and damping ratios of civil structures can be determined by using Natural Excitation Technique (NExT) and Direct Interpolating approach (DI). The feasibility and accuracy of the proposed procedure are evaluated by both numerical and full-scale examples. The natural frequencies and damping ratios are successfully identified from the vibration responses with high noise and nonstationary characteristics. The results of this study illustrate that the proposed procedure provides a powerful approach to identify the modal parameters of civil structures using non-stationary responses.
 
Key Words
    damping ratios; improved variational mode decomposition; modal parameter estimation; natural frequencies; non-stationary
 
Address
Lun-hai Zhi, Feng Hu, Chunfeng Zhao and Jingfeng Wang: College of Civil Engineering, Hefei University of Technology, Hefei 230009, China
 

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