Smart Structures and Systems

  • 제17권3호
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  • Pages.413-429
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  • 2016
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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

Modal identifiability of a cable-stayed bridge using proper orthogonal decomposition

  • Li, M. (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Ni, Y.Q. (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University)
  • 투고 : 2015.06.22
  • 심사 : 2015.12.02
  • 발행 : 2016.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

The recent research on proper orthogonal decomposition (POD) has revealed the linkage between proper orthogonal modes and linear normal modes. This paper presents an investigation into the modal identifiability of an instrumented cable-stayed bridge using an adapted POD technique with a band-pass filtering scheme. The band-pass POD method is applied to the datasets available for this benchmark study, aiming to identify the vibration modes of the bridge and find out the so-called deficient modes which are unidentifiable under normal excitation conditions. It turns out that the second mode of the bridge cannot be stably identified under weak wind conditions and is therefore regarded as a deficient mode. To judge if the deficient mode is due to its low contribution to the structural response under weak wind conditions, modal coordinates are derived for different modes by the band-pass POD technique and an energy participation factor is defined to evaluate the energy participation of each vibration mode under different wind excitation conditions. From the non-blind datasets, it is found that the vibration modes can be reliably identified only when the energy participation factor exceeds a certain threshold value. With the identified threshold value, modal identifiability in use of the blind datasets from the same structure is examined.

키워드

참고문헌

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피인용 문헌

  1. Human induced vibration vs. cable-stay footbridge deterioration vol.18, pp.1, 2016, https://doi.org/10.12989/sss.2016.18.1.017
  2. Dynamic Property Evaluation of a Long-Span Cable-Stayed Bridge (Sutong Bridge) by a Bayesian Method pp.1793-6764, 2018, https://doi.org/10.1142/S0219455419400108
  3. Mode identifiability of a cable-stayed bridge using modal contribution index vol.20, pp.2, 2017, https://doi.org/10.12989/sss.2017.20.2.115
  4. Fast operational modal analysis of a single-tower cable-stayed bridge by a Bayesian method vol.174, pp.None, 2021, https://doi.org/10.1016/j.measurement.2021.109048
  5. Hilbert square demodulation and error mitigation of the measured nonlinear structural dynamic response vol.160, pp.None, 2016, https://doi.org/10.1016/j.ymssp.2021.107935