Smart Structures and Systems

  • 제15권1호
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  • Pages.81-97
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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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DOI QR코드

DOI QR Code

Blind modal identification of output-only non-proportionally-damped structures by time-frequency complex independent component analysis

  • Nagarajaiah, Satish (Department of Civil and Environmental Engineering and Department of Mechanical Engineering, Rice Univ.) ;
  • Yang, Yongchao (Department of Civil and Environmental Engineering, Rice Univ.)
  • 투고 : 2014.01.25
  • 심사 : 2014.05.23
  • 발행 : 2015.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

Recently, a new output-only modal identification method based on time-frequency independent component analysis (ICA) has been developed by the authors and shown to be useful for even highly-damped structures. In many cases, it is of interest to identify the complex modes of structures with non-proportional damping. This study extends the time-frequency ICA based method to a complex ICA formulation for output-only modal identification of non-proportionally-damped structures. The connection is established between complex ICA model and the complex-valued modal expansion with sparse time-frequency representation, thereby blindly separating the measured structural responses into the complex mode matrix and complex-valued modal responses. Numerical simulation on a non-proportionally-damped system, laboratory experiment on a highly-damped three-story frame, and a real-world highly-damped base-isolated structure identification example demonstrate the capability of the time-frequency complex ICA method for identification of structures with complex modes in a straightforward and efficient manner.

키워드

참고문헌

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