Asymptotic identification uncertainty of close modes in Bayesian operational modal analysis

• Published in: Mechanical systems and signal processing Vol. 133; p. 106273
• Main Authors: Au, Siu-Kui, Brownjohn, James M.W.
• Format: Journal Article
• Language: English
• Published: Berlin Elsevier Ltd 01.11.2019; Elsevier BV
• Subjects: Algorithms; Ambient modal identification; Asymptotic properties; Bayesian analysis; Close modes; Covariance matrix; Damping; Eigenvalues; Fisher Information Matrix; Modal analysis; Operational modal analysis; Parameters; Signal to noise ratio; Tall buildings; Uncertainty analysis; Uncertainty laws; Fisher Information Matrix; Uncertainty laws; Ambient modal identification; Close modes; Operational modal analysis

•Analytical study of identification (ID) uncertainty of close modes from ambient data.•Analytical expressions for Fisher Information Matrix of modal parameters for high S/N ratio.•Discovered and quantified two principal types of mode shape uncertainty.•ID uncertainty within mode shape subspace preva...