Smart Structures and Systems

  • 제16권5호
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  • Pages.919-935
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  • 2015
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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EMD-based output-only identification of mode shapes of linear structures

  • Ramezani, Soheil (Department of Structural Engineering, International Institute of Earthquake Engineering and Seismology) ;
  • Bahar, Omid (Department of Structural Engineering, International Institute of Earthquake Engineering and Seismology)
  • 투고 : 2012.11.05
  • 심사 : 2014.06.02
  • 발행 : 2015.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

The Hilbert-Huang transform (HHT) consists of empirical mode decomposition (EMD) and Hilbert spectral analysis. EMD has been successfully applied for identification of mode shapes of structures based on input-output approaches. This paper aims to extend application of EMD for output-only identification of mode shapes of linear structures. In this regard, a new simple and efficient method based on band-pass filtering and EMD is proposed. Having rather accurate estimates of modal frequencies from measured responses, the proposed method is capable to extract the corresponding mode shapes. In order to evaluate the accuracy and performance of the proposed identification method, two case studies are considered. In the first case, the performance of the method is validated through the analysis of simulated responses obtained from an analytical structural model with known dynamical properties. The low-amplitude responses recorded from the UCLA Factor Building during the 2004 Parkfield earthquake are used in the second case to identify the first three mode shapes of the building in three different directions. The results demonstrate the remarkable ability of the proposed method in correct estimation of mode shapes of the linear structures based on rather accurate modal frequencies.

키워드

참고문헌

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피인용 문헌

  1. Online structural identification by Teager Energy Operator and blind source separation vol.26, pp.2, 2015, https://doi.org/10.12989/sss.2020.26.2.135