Structural Engineering and Mechanics

  • 제87권1호
  • /
  • Pages.1-18
  • /
  • 2023
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A novel Metropolis-within-Gibbs sampler for Bayesian model updating using modal data based on dynamic reduction

  • Ayan Das (Department of Civil Engineering, Indian Institute of Technology Delhi) ;
  • Raj Purohit Kiran (Department of Civil Engineering, Indian Institute of Technology Delhi) ;
  • Sahil Bansal (Department of Civil Engineering, Indian Institute of Technology Delhi)
  • 투고 : 2022.09.30
  • 심사 : 2023.05.15
  • 발행 : 2023.07.10
⟨ 이전 논문 다음 논문 ⟩

초록

The paper presents a Bayesian Finite element (FE) model updating methodology by utilizing modal data. The dynamic condensation technique is adopted in this work to reduce the full system model to a smaller model version such that the degrees of freedom (DOFs) in the reduced model correspond to the observed DOFs, which facilitates the model updating procedure without any mode-matching. The present work considers both the MPV and the covariance matrix of the modal parameters as the modal data. Besides, the modal data identified from multiple setups is considered for the model updating procedure, keeping in view of the realistic scenario of inability of limited number of sensors to measure the response of all the interested DOFs of a large structure. A relationship is established between the modal data and structural parameters based on the eigensystem equation through the introduction of additional uncertain parameters in the form of modal frequencies and partial mode shapes. A novel sampling strategy known as the Metropolis-within-Gibbs (MWG) sampler is proposed to sample from the posterior Probability Density Function (PDF). The effectiveness of the proposed approach is demonstrated by considering both simulated and experimental examples.

키워드

과제정보

The authors would like to gratefully acknowledge the Grant-in-aid scheme received from Aeronautics R&D Board, Government of India.

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