Fundamental two-stage formulation for Bayesian system identification, Part II: Application to ambient vibration data



Zhang, Feng-Liang and Au, Ivan ORCID: 0000-0002-0228-1796
(2016) Fundamental two-stage formulation for Bayesian system identification, Part II: Application to ambient vibration data. Mechanical Systems and Signal Processing, 66-67. pp. 43-61.

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Abstract

A fundamental theory has been developed for a general two-stage Bayesian system identification problem in the companion paper (Part I). This paper applies the theory to the particular case of structural system identification using ambient vibration data. In Stage I, the modal properties are identified using the Fast Bayesian FFT method. Given the data, their posterior distribution can be well approximated by a Gaussian distribution whose mean and covariance matrix can be computed efficiently. In Stage II, the structural model parameters (e.g., stiffness, mass) are identified incorporating the posterior distribution of the natural frequencies and mode shapes in Stage I and their conditional distribution based on the theoretical structural finite element model. Synthetic and experimental data are used to illustrate the proposed theory and applications. A number of factors commonly relevant to structural system identification are studied, including the number of measured degrees of freedom, the number of identifiable modes and sensor alignment error.

Item Type: Article
Uncontrolled Keywords: ambient modal identification, Bayesian operational modal analysis, system identification, two-stage approach, fast Bayesian FFT method
Depositing User: Symplectic Admin
Date Deposited: 12 Sep 2016 08:36
Last Modified: 19 Jan 2023 07:30
DOI: 10.1016/j.ymssp.2015.04.024
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003222