Reducing coherent filtering artefacts in time‐domain operational modal analysis

• Published in: Structural control and health monitoring Vol. 29; no. 8
• Main Authors: Wynne, Zachariah, Hopgood, James R., Stratford, Tim, Reynolds, Thomas P. S.
• Format: Journal Article
• Language: English
• Published: Pavia John Wiley & Sons, Inc 01.08.2022
• Subjects: ambient vibration testing; Concrete slabs; Correlation; Corruption; covariance‐driven stochastic‐subspace identification; Damping; Domains; Estimates; Excitation; filtering artefacts; Filtration; Modal analysis; Noise reduction; operational modal analysis; Oscillations; random decrement technique; Resonant frequencies; time‐domain modal analysis; Vibration; Vibration analysis

Signals collected for modal analysis are often filtered in order to reduce sensor noise, out‐of‐band oscillations, or for dealing with closely‐spaced modes. This filtering introduces filtering artefacts into the data due to the non‐ideal filter response and is well understood for impulse excitation....